Kubota WSM BX1880 Workshop Manual
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Kubota WSM BX1880 Workshop Manual

Kubota WSM BX1880 Workshop Manual

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WORKSHOP MANUAL
TRACTOR,MOWER
BX1880,BX2380,BX2680,
RCK60B-23BX,RCK54-23BX,
RCK48-18BX,RCK60D-26BX,
RCK54D-26BX
KiSC issued 03, 2019 A

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Summary of Contents for Kubota WSM BX1880

  • Page 1 WORKSHOP MANUAL TRACTOR,MOWER BX1880,BX2380,BX2680, RCK60B-23BX,RCK54-23BX, RCK48-18BX,RCK60D-26BX, RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 2 All illustrations, photographs and specifications contained in this manual are of the newest information available at the time of publication. Kubota reserves the right to change all information at any time without notice. Since this manual includes many models, information or illustrations and photographs can show more than one model.
  • Page 3 RECORD OF REVISIONS For pdf, use search function [Search word] to find all the revised locations. Last digit of Month of revi- Reference Main revised point and corrective measure [Search word] the code No. sion page 2017 April Addition of contents for the model BX1880. －...
  • Page 4 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 5: Table Of Contents

    CONTENTS 1. INFORMATION SAFETY FIRST..............................1-1 1. Safety first..............................1-1 2. Before you start service ..........................1-2 3. Start safely..............................1-2 4. Operate safely ............................1-2 5. Avoiding high pressure fluid........................1-3 6. Avoiding hot exhaust ..........................1-3 7. Cleaning exhaust filter ..........................1-3 8.
  • Page 6 1.2 Daily check ............................2-19 1.2.1 Walk around inspection......................2-19 1.2.2 Checking fuel gauge and refueling ..................2-19 1.2.3 Checking engine oil level ......................2-20 1.2.4 Checking transmission fluid level.................... 2-20 1.2.5 Checking coolant level ......................2-21 1.2.6 Cleaning panel and radiator screen ..................2-21 1.2.7 Checking brake pedal ......................
  • Page 7 1.14 Check points of every 4 years ....................... 2-40 1.14.1 Replacing radiator hose ......................2-40 1.14.2 Replacing fuel hose ......................2-40 1.14.3 Replacing power steering hose .................... 2-40 1.14.4 Replacing intake air line......................2-40 1.14.5 Replacing engine breather hose ................... 2-40 1.15 Service as required ........................
  • Page 8 2.5 Check and high pressure relief valve assembly tool ............... 2-65 2.6 Quick coupler cartridge socket ......................2-67 3. ENGINE MECHANISM ..............................3-1 1. Engine body..............................3-1 1.1 Function of cylinder block........................3-1 1.2 Function of closed breather....................... 3-1 1.3 Function of half-floating head cover ....................3-1 1.4 Function of piston ..........................
  • Page 9 5. Disassembling and assembling ......................3-38 5.1 Separating engine ........................... 3-38 5.1.1 Draining engine oil ........................3-38 5.1.2 Removing battery........................3-38 5.1.3 Removing bonnet........................3-39 5.1.4 Disconnecting wiring harness and ground cables ..............3-40 5.1.5 Disconnecting fuel hoses ......................3-40 5.1.6 Disconnecting accelerator wire ....................
  • Page 10 6.5.1 Checking cylinder wear......................3-76 6.5.2 Correcting cylinder (Oversize) ....................3-76 6.6 Oil pump ............................3-77 6.6.1 Checking rotor lobe clearance ....................3-77 6.6.2 Checking clearance between outer rotor and pump body ............3-77 6.6.3 Checking clearance between rotor and cover ................ 3-78 6.7 Relief valve spring ...........................
  • Page 11 5.1.7 Removing fender ........................4-38 5.1.8 Removing fuel tank ......................... 4-38 5.1.9 Removing rear wheel ......................4-39 5.1.10 Removing fender center stay ....................4-39 5.1.11 Removing fender bracket and hitch plate................4-39 5.1.12 Removing transaxle assembly ....................4-40 5.1.13 Removing brake pedal ......................4-41 5.1.14 Removing propeller shaft ......................
  • Page 12 6.2.13 Checking flatness of actuator and bearing holder ..............4-62 6.2.14 Checking height of cam plate and ball .................. 4-63 6.2.15 Checking brake disc and friction plate wear ................. 4-63 5. FRONT AXLE MECHANISM ..............................5-1 1. Structure of front axle ..........................5-1 2.
  • Page 13 2. Servicing specifications for steering ......................6-9 3. Tightening torques for steering ....................... 6-10 4. Checking and adjusting .......................... 6-11 4.1 Checking relief valve operating pressure ..................6-11 5. Disassembling and assembling ......................6-11 5.1 Power steering cylinder ........................6-11 5.1.1 Removing adapter and tie-rod ....................
  • Page 14 10.3.3 Loader control lever in down position ................... 7-23 10.3.4 Loader control lever in floating position ................7-25 10.3.5 Loader control lever in roll-back position ................7-27 10.3.6 Loader control lever in dump position ................... 7-29 SERVICING ..............................7-31 1. Troubleshooting for hydraulic system ..................... 7-31 2.
  • Page 15 6.1.1 Checking clearance between tip of gear tooth and casing ............. 7-50 6.1.2 Checking clearance between bushing and shaft ..............7-51 6.1.3 Checking side plate thickness ....................7-51 6.2 Hydraulic cylinder ..........................7-51 6.2.1 Checking hydraulic cylinder bore .................... 7-51 6.2.2 Checking hydraulic arm shaft bushing ..................
  • Page 16 4.3.1 Checking motor........................8-32 4.3.2 Testing starter magnet switch (pull-in, holding coils) .............. 8-32 4.4 Glow plug ............................8-32 4.4.1 Checking glow plug lead terminal voltage ................8-32 4.4.2 Checking glow plug continuity ....................8-33 4.5 Safety switch ...........................8-33 4.5.1 Checking PTO shift lever switch continuity ................8-33 4.5.2 Checking HST neutral switch continuity .................
  • Page 17 5.2.7 Removing rotor ........................8-50 5.2.8 Removing retainer plate......................8-50 5.2.9 Removing bearing on drive end side ..................8-50 5.2.10 Removing bearing at slip ring side..................8-50 6. Servicing ..............................8-50 6.1 Starter .............................8-50 6.1.1 Checking overrunning clutch ....................8-50 6.1.2 Checking commutator and mica ..................... 8-51 6.1.3 Checking brush wear ......................
  • Page 18 7.4 Removing blade boss........................9-21 7.5 Removing gear box and mower belt ....................9-21 7.6 Disassembling gear box ........................9-22 7.7 Removing center pulley holder......................9-22 7.8 Removing outer pulley and blade shaft ................... 9-23 7.9 Removing balancer ......................... 9-24 8.

  • Page 19: Information

    INFORMATION KiSC issued 03, 2019 A...

  • Page 20: Safety First

     SAFETY FIRST 1. Safety first 1. INFORMATION SAFETY FIRST 1. Safety first This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully. It is essential that you read the instructions and safety regulations before you try to repair or use this unit.

  • Page 21: Before You Start Service

     SAFETY FIRST 1. INFORMATION 2. Before you start service 2. Before you start service 4. Operate safely • Read all instructions and safety instructions in this manual and on your machine safety decals. • Clean the work area and machine. • Park the machine on a stable and level ground, and set the parking brake.

  • Page 22: Avoiding High Pressure Fluid

     SAFETY FIRST 5. Avoiding high pressure fluid 1. INFORMATION 6. Avoiding hot exhaust loosen the cap to release the pressure before you remove it fully. • Released fluid (fuel or hydraulic oil) under pressure can cause damage to the skin and cause serious injury.

  • Page 23: Prevent A Fire

     SAFETY FIRST 1. INFORMATION 8. Prevent a fire 10. Discard fluids correctly • Avoid skin exposure and contact with hot exhaust gas or components. Exhaust gas and components are extremely hot during regeneration of diesel particulate filter (DPF). 8. Prevent a fire •...

  • Page 24: Preparing For Emergencies

     SAFETY FIRST 12. Preparing for emergencies 1. INFORMATION 12. Preparing for emergencies • Keep a first aid kit and fire extinguisher ready at all times. • Keep emergency numbers near your telephone at all times. BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 25  SAFETY FIRST 1. INFORMATION   BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 26: Safety Label

     SAFETY LABEL 1. Safety labels for BX tractor 1. INFORMATION SAFETY LABEL 1. Safety labels for BX tractor The safety labels are installed on the machine. If a label becomes damaged, illegible or is not on the machine, replace it. The label part number is listed in the parts list. BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 27  SAFETY LABEL 1. INFORMATION   BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 28  SAFETY LABEL   1. INFORMATION BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 29  SAFETY LABEL 1. INFORMATION   1-10 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 30  SAFETY LABEL   1. INFORMATION 1-11 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 31: Safety Labels For Mower

     SAFETY LABEL 1. INFORMATION 2. Safety labels for mower 2. Safety labels for mower The safety labels are installed on the mower. If a label becomes damaged, illegible or is not on the mower, replace it. The label part number is listed in the parts list. 1-12 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 32  SAFETY LABEL 2. Safety labels for mower 1. INFORMATION 1-13 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 33: Care Of Danger, Warning And Caution Labels

     SAFETY LABEL 1. INFORMATION 2. Safety labels for mower 2.1 Care of danger, warning and caution labels • Keep danger, warning and caution labels clean and free from obstructing material. • Clean danger, warning and caution labels with soap and water, dry with a soft cloth. •...

  • Page 34: Specifications

    Model BX1880 BX2380 BX2680 PTO power 10.2 kW (13.7 HP) 13.2 kW (17.7 HP) 14.5 kW (19.5 HP) Maker Kubota Model D722 D902 D1005 Type Liquid-cooled, 4-cycle diesel Number of cylinders 67 × 68 mm (2.64 × 72 × 73.6 mm (2.83 ×...
  • Page 35 Type SAE 1-3/8, 6 splines Rear PTO Revolution STD 540 min (rpm) Type USA No.5 (Kubota 10-tooth) involute spline Mid PTO Revolution STD 2500 mm (rpm) Manufacturer's estimate SAE J1995 The engine output value indicated on the EPA exhaust gas label is the ISO 8178 net value without a cooling fan.

  • Page 36: Mower Specifications (Rck60B-23Bx, Rck54-23Bx And Rck48-18Bx)

     SPECIFICATIONS 2. Mower specifications (RCK60B-23BX, RCK54-23BX and RCK48-18BX) 1. INFORMATION 2. Mower specifications (RCK60B-23BX, RCK54-23BX and RCK48-18BX) Model RCK60B-23BX RCK54-23BX RCK48-18BX Suitable tractor BX2380, BX2680 BX1880, BX2380 BX1880 Quick-Joint, parallel linkage Mounting method Self-balance suspended linkage Suspended linkage Adjustment of cutting height Dial gauge Cutting width 1524 mm (60 in.)

  • Page 37: Mower Specifications (Rck60D-26Bx And Rck54D-26Bx)

     SPECIFICATIONS 1. INFORMATION 3. Mower specifications (RCK60D-26BX and RCK54D-26BX) 3. Mower specifications (RCK60D-26BX and RCK54D-26BX) Model RCK60D-26BX RCK54D-26BX Suitable tractor BX2380, BX2680 BX2380 Drive-over-quick-joint, parallel linkage Mounting method Drive-over-suspended-linkage Adjustment of cutting height Dial gauge Cutting width 1524 mm (60 in.) 1372 mm (54 in.) Cutting height 25 to 102 mm (1.0 to 4.0 in.) Mower...

  • Page 38: Traveling Speeds

     TRAVELING SPEEDS   1. INFORMATION TRAVELING SPEEDS Model BX1880 BX2380 and BX2680 Tire size (Rear) 24 × 12.00-12 26 × 12.00-12 Speed control pedal Range gear shift lever (At max engine rpm) 0 to 5.5 km/h 0 to 6.0 km/h 0 to 3.4 mph 0 to 3.7 mph Forward 0 to 12.0 km/h...
  • Page 39   1. INFORMATION   1-20 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 40: Dimensions

     DIMENSIONS   1. INFORMATION DIMENSIONS 1-21 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 41   1. INFORMATION   1-22 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 42: General

    GENERAL KiSC issued 03, 2019 A...

  • Page 43: Identification

    2. GENERAL IDENTIFICATION 1. Tractor identification 1.1 Checking serial number and hour meter • When contacting your local KUBOTA distributor, always specify engine serial number, tractor serial number and hour meter reading. (1) Tractor identification plate (2) Tractor serial number (3) ROPS identification plate...

  • Page 44: Cylinder Number

    [A] RCK48-18BX, RCK54-23BX, RCK60D-26BX and RCK60B-23BX 1.2 Cylinder number The cylinder numbers of KUBOTA diesel engine are designated as shown in the figure. The sequence of cylinder numbers is given as No.1, No.2 and No.3 starting from the gear case side.

  • Page 45: General Precautions

    • Remove oil and dirt from parts before you measure. • Use KUBOTA genuine parts for replacement to keep the machine performance and to make sure of safety.
  • Page 46   2. GENERAL   BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 47: Handling Precautions For Electrical Parts And Wiring

     HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING   2. GENERAL HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING IMPORTANT • Check electrical wiring damage loosened connection every year. To this end, educate the customer to do his or her own check and at the same time recommend the dealer to perform periodic check for a fee.
  • Page 48   2. GENERAL   BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 49: Lubricants, Fuel And Coolant

    Moderate amount Oil amount when the oil level is at the upper level of the oil level gauge. The product name of KUBOTA genuine UDT fluid may be different from that in the operator's manual depending on countries or territories. BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX...

  • Page 50: Fuel

    • The CJ-4 engine oil is intended for diesel particulate filter (DPF) type engines, and cannot be used on this tractor. 1.1.3 Transmission oil *KUBOTA Super UDT-2: For an enhanced ownership experience, we highly recommend Super UDT-2 to be used instead of standard hydraulic/transmission fluid.

  • Page 51: Overview Of Biodiesel Fuel (Bdf)

    Consequently, palm-oil-based feedstock may reduce performance of the fuel filter, particularly during cold weather conditions. • The Kubota warranty, as specified in the Owner's Warranty Information Guide, only covers flaws in product materials and workmanship. Accordingly, the Kubota warranty does not cover any problems that may arise due to the use of poor quality fuels that fail to meet the preceding requirements, whether biodiesel or mineral-oil-based.
  • Page 52  LUBRICANTS, FUEL AND COOLANT 2. GENERAL 1. BX tractor See the following table for the new maintenance interval. Items Interval Remarks Check Every 50 hr － Fuel filter Replace Every 200 hr － Replace if any deterioration (crack, hardening, Check Every 6 months scar, or deformation) or damage occurred.

  • Page 53: Mower

     LUBRICANTS, FUEL AND COOLANT 2. Mower 2. GENERAL 2. Mower 2.1 Lubricants RCK60B-23BX, RCK54-23BX, RCK48-18BX, RCK60D-26BX, and RCK54D-26BX Place Capacity Lubricant 0.36 L • SAE 90 gear oil (API Service Gear box 0.38 U.S.qts GL-5 gear oil) 0.32 Imp.qts Greasing Place Capacity Type of grease Universal joint Three spindle shafts...
  • Page 54  LUBRICANTS, FUEL AND COOLANT 2. GENERAL 2. Mower 2-12 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 55: Tightening Torques

     TIGHTENING TORQUES 1. General use screws, bolts and nuts 2. GENERAL TIGHTENING TORQUES 1. General use screws, bolts and nuts Indica- tion on No-grade or 4T top of bolt Indica- tion on No-grade or 4T top of Materi- al of oppo- Ordinariness Aluminum Ordinariness Aluminum...

  • Page 56: Metric Screws, Bolts And Nuts

     TIGHTENING TORQUES 2. GENERAL 3. Metric screws, bolts and nuts 3. Metric screws, bolts and nuts Grade Property class 8.8 Property class 10.9 Unit N⋅m kgf⋅m lbf⋅ft N⋅m kgf⋅m lbf⋅ft 24 to 27 2.4 to 2.8 18 to 20 30 to 34 3.0 to 3.5 22 to 25 48 to 55...

  • Page 57: Maintenance Check List

     MAINTENANCE CHECK LIST 1. BX tractor service intervals 2. GENERAL MAINTENANCE CHECK LIST 1. BX tractor service intervals Indication on hour meter Ref- eren Items Since then 50 100 150 200 250 300 350 400 450 500 550 600 650 700 page Engine oil Change ◎...
  • Page 58 • The items which is @ marked are registered as the emission-related-critical-parts by KUBOTA in the U.S.EPA nonroad emission reg- ulation. As the engine owner, you are responsible for the performance of the required maintenance on the engine according to the preceding instruction.

  • Page 59: Mower Service Intervals

     MAINTENANCE CHECK LIST 2. Mower service intervals 2. GENERAL 2. Mower service intervals To keep the mower working in good condition as well as to avoid any accident and trouble, do periodic inspection and maintenance. Check the following points before use. Service interval Item Reference page Daily check...
  • Page 60  MAINTENANCE CHECK LIST 2. GENERAL   2-18 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 61: Check And Maintenance

     CHECK AND MAINTENANCE 1. Periodic service 2. GENERAL CHECK AND MAINTENANCE 1. Periodic service – Park the machine on firm and level ground. – Set the parking brake. – Lower the implement to the ground. WARNING – Release residual pressure hydraulic system. To avoid serious injury or death: –...

  • Page 62: Checking Engine Oil Level

     CHECK AND MAINTENANCE 2. GENERAL 1. Periodic service 2. Fill the fuel tank with fuel when the fuel gauge BX1880 and BX2380 shows as follows. Amount of fuel for refueling 1/4 or less in the fuel tank 25 L Fuel tank Capacity 6.6 U.S.gals BX2680 (1) Fuel tank cap...

  • Page 63: Checking Coolant Level

     CHECK AND MAINTENANCE 1. Periodic service 2. GENERAL 2. Check to see that the transmission fluid level lies between the two notches. 3. If the transmission fluid level is too low, add new fluid to the prescribed level at the oil inlet. (1) Recovery tank (B) [L] (A) [H]...

  • Page 64: Checking Brake Pedal

     CHECK AND MAINTENANCE 2. GENERAL 1. Periodic service 2. Detach the radiator screen, and then remove all the 1.2.9 Checking head light, hazard light, and foreign material. tail light NOTE 1. Inspect the lights for broken bulbs and lenses. • If the dust or chaff is accumulated in the 2.

  • Page 65: Checking Movable Parts

    IMPORTANT • To prevent serious damage to the engine, use only a KUBOTA genuine filter. 1. Remove the oil filter. 2. Put a film of the clean engine oil on the rubber seal of the new filter.

  • Page 66: Replacing Transmission Oil Filter

    IMPORTANT • To prevent serious damage to the hydraulic system, use only a KUBOTA genuine filter. 1. Remove the transmission oil filter. 2. Put a film of clean transmission oil on rubber seal of new transmission oil filter.
  • Page 67  CHECK AND MAINTENANCE 1. Periodic service 2. GENERAL 1. Apply a small amount of multipurpose grease to the following points. (1) Speed control pedal [B] Figure (B) (2) Battery terminals [C] Figure (C) (3) Rear link [D] Figure (D) (4) Bonnet guide rod [A] Figure (A) 2-25 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX...

  • Page 68: Checking Engine Start System

     CHECK AND MAINTENANCE 2. GENERAL 1. Periodic service 1.4.3 Checking operator presence control RELATED PAGE (OPC) system 1.1 Lubricants, fuel, and coolant on page 2-7 WARNING 1.4.2 Checking engine start system To avoid serious injury or death: • Do not allow anyone near the tractor while testing.

  • Page 69: Cleaning Lock Lever Shaft

     CHECK AND MAINTENANCE 1. Periodic service 2. GENERAL • Never operate the tractor with a loose rim, wheel, or axle. • Any time bolts are loosened, retighten to the specified torque. • Check all bolts frequently and keep them tight. 1. Check the wheel bolts regularly especially when new.

  • Page 70: Cleaning Air Cleaner Element

     CHECK AND MAINTENANCE 2. GENERAL 1. Periodic service • Keep open sparks and flames away from the connecting the cable to the battery, start with battery at all times. Hydrogen gas mixed with the positive terminal first. oxygen becomes very explosive. • Never check battery charge by placing a metal •...

  • Page 71: Checking Fuel Filter

     CHECK AND MAINTENANCE 1. Periodic service 2. GENERAL passes by the baffle and directly adheres to the BX2680 air cleaner element. NOTE • Check to see if the evacuator valve is blocked with dust. Open the evacuator valve once a week under ordinary conditions or daily when used in a dusty place to get rid of large particles of dust and dirt.

  • Page 72: Adjusting Fan Belt Tension

     CHECK AND MAINTENANCE 2. GENERAL 1. Periodic service 3. Check the fuel filter. If the fuel filter is clogged by alternator out until the deflection of the belt falls debris or contaminated by water, replace it. within acceptable limits. (1) Bolt (A) Check the belt tension. 4.

  • Page 73: Adjusting Brake Pedal

     CHECK AND MAINTENANCE 1. Periodic service 2. GENERAL • Even if free travel of the brake pedal is within the limitation, adjust the brake pedal. 1. Release the parking brake. 2. Loosen the lock nut and turn the turnbuckle to adjust the rod length so that the brake free travel is 10 mm (0.4 in.).

  • Page 74: Changing Engine Oil

    • To prevent serious damage to the engine, use completely into the oil pan. only a KUBOTA genuine filter. 2. After draining of the used engine oil, reinstall the 1. Remove the oil filter.

  • Page 75: Replacing Transmission Oil Filter

    0 to 0.2 in. IMPORTANT • To prevent serious damage to the hydraulic system, use only a KUBOTA genuine filter. 1. Remove the transmission oil filter. 2. Put a film of clean transmission oil on rubber seal of new transmission oil filter.

  • Page 76: Changing Transmission Fluid

     CHECK AND MAINTENANCE 2. GENERAL 1. Periodic service If the front axle pivot pin adjustment is not correct, front 2. After draining the transmission fluid, reinstall the wheel vibration can occur causing vibration in the drain plug. steering wheel. 3. Clean the transmission strainer. 4.

  • Page 77: Cleaning Transmission Strainer

     CHECK AND MAINTENANCE 1. Periodic service 2. GENERAL 1.7.3 Cleaning transmission strainer 1. When changing the transmission fluid, disassemble rinse transmission strainer with nonflammable solvent to completely clean off filings. When reassembling the transmission strainer, be careful not to damage the parts. (1) Breather plug (A) Front axle case oil level is (2) Oil gauge with dipstick...

  • Page 78: Check Points Of Every 800 Hours

     CHECK AND MAINTENANCE 2. GENERAL 1. Periodic service 1.10 Check points of every 1500 2. Disconnect the fuel hoses and loosen the pipe clamp to replace the fuel filter (5). hours 1.10.1 Checking injection pressure of fuel injection nozzle • See “Checking fuel injection pressure”. RELATED PAGE 4.4.5 Checking fuel injection pressure on page 3-36 1.11 Check points of every 2000...

  • Page 79: Antifreeze

    • Also, follow relevant environmental protection regulations when disposing of the antifreeze. Always use a 50/50 mix of long-life coolant and clean soft water in KUBOTA engines. 2-37 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 80: Check Points Of Every 3000 Hours

    If mixed with the cleaning agent, sludge may BX2680 build up, adversely affecting the engine parts. • KUBOTA's genuine long-life coolant has a service life of two years. Be sure to change the coolant every two years. • The procedure for the mixing of water and the antifreeze differs according to the make of the antifreeze and the ambient temperature.

  • Page 81: Checking Power Steering Line

     CHECK AND MAINTENANCE 1. Periodic service 2. GENERAL • Be sure to stop the engine and remove the key 1.13.4 Checking fuel lines before checking the radiator hose and the hose clamps. WARNING 1. If the hose clamps are loose or water leaks, tighten To avoid serious injury or death: them securely.

  • Page 82: Checking Engine Breather Hose

     CHECK AND MAINTENANCE 2. GENERAL 1. Periodic service 1.14 Check points of every 4 years 3. Check the fuel filter. If the fuel filter is clogged by debris or contaminated by water, replace it. 1.14.1 Replacing radiator hose 1. Replace the radiator hoses and tighten the hose clamps securely.

  • Page 83: Service As Required

     CHECK AND MAINTENANCE 1. Periodic service 2. GENERAL 1.15 Service as required 1.15.1 Bleeding fuel system Air must be removed: • When the fuel filter or lines are removed. • When the tank is completely empty. • After the tractor has not been used for a long period of time.

  • Page 84: Replacing Light Bulb

     CHECK AND MAINTENANCE 2. GENERAL 1. Periodic service 4. If the mower blade screw (2) is worn or broken, 1.15.3 Replacing light bulb replace it. Light Capacity Head light 37.5 W × 2 2.1.2 Checking mower blade Tail light 12.8 W × 2 Hazard light 27 W ×...

  • Page 85: Checking Mower Belt

     CHECK AND MAINTENANCE 2. Mower 2. GENERAL 1. Place the mower on level ground. 2.1.3 Checking mower belt 2. Loosen the check plug (1), and check to see if oil seems from the opening. 3. If the oil level is low, remove the oil filler plug (2) and add new gear oil.

  • Page 86: Greasing Balance Shaft

     CHECK AND MAINTENANCE 2. GENERAL 2. Mower [Only for RCK54D-26BX] 1. Grease the grease fitting (1) of the balance shaft if 2. Remove the ramp bracket (5) for greasing spindle the amount of grease is insufficient. shafts. To remove the ramp bracket (5), remove the pin (6) and clevis pin (4) and slide the ramp bracket (5) to rear side.

  • Page 87: Greasing Front And Rear Anti-Scalp Rollers

     CHECK AND MAINTENANCE 2. Mower 2. GENERAL 2.1.7 Greasing front and rear anti-scalp rollers 1. Grease the grease fitting (1), (2) of the front and rear anti-scalp rollers if the amount of grease is insufficient. (1) Spline (2) Grease fitting [RCK60D-26BX and RCK54D-26BX only] 2.

  • Page 88: Check Point Of Every 150 Hours

     CHECK AND MAINTENANCE 2. GENERAL 2. Mower 3. Remove the drain plug (1), and drain the used oil completely. (1) Oil seal (2) Oil seal 2.5 Check point of every 4 years 2.5.1 Replacing gear box oil seal 1. Replace the gear box oil seals (1), (2) with new (1) Check plug [B] RCK60D-26BX and (2) Oil filler plug...

  • Page 89: Tires, Wheels, And Ballast

    150 kPa (1.5 kgf/cm • Do not use tires other than those approved by 18×8.50-10 Ind. [22 psi] KUBOTA. • When you intend to mount different size of tires NOTE from equipped ones, consult your dealer about • Maintain the maximum pressure in front tires, if front drive gear ratio for details.

  • Page 90: Front Wheels

     TIRES, WHEELS, AND BALLAST 2. GENERAL 2. Wheel tread Models BX1880 BX2380 and BX2680 18×8.50-10 Turf, 16×7.50-8 Turf, Tire 18×8.50-10 Bar, 16×7.50-8 Bar 18×8.50-10 Ind. Tread (1) Bolt Tightening torques 149.2 N⋅m to 179.0 N⋅m Front (15.2 kgf⋅m to 18.3 kgf⋅m) [110 lbf⋅ft to 132 lbf⋅ft] 930 mm (36.6 in.) 108.5 N⋅m to 130.2 N⋅m How to jack up the front axle...

  • Page 91: Ballast

     TIRES, WHEELS, AND BALLAST 3. Ballast 2. GENERAL 3.1 Front ballast Models BX2380 and BX2680 Tire 26×12.00-12 Turf, 262.00-12 Bar, 26×12.00-12 Ind. IMPORTANT • Do not overload tires. • Add no more weight than indicated in the following table. 125 kg Maximum weight (275 lbs.) Add weights if needed to improve traction or for Tread...
  • Page 92  TIRES, WHEELS, AND BALLAST 2. GENERAL 3. Ballast Liquid weight per tire (75 percent filled) 26×12.00-12 [BX2380 Tire sizes and BX2680] Slush free at -10 ℃ (14 ℉) Solid at -30 ℃ (-22 ℉) 45 kg (99 lbs.) [Approx. 1 kg (2 lbs.) CaCl per 4 L (1 gal) of water] Slush free at -24 ℃...

  • Page 93: Implement Limitations

     IMPLEMENT LIMITATIONS 1. Weight of implements as rear ballast 2. GENERAL IMPLEMENT LIMITATIONS 1. Weight of implements as rear ballast WARNING To avoid personal injury or death: • For tractor stability and operator's safety, add the rear ballast to the rear of the tractor in the form of 3- point counter weight and the rear wheel ballast.

  • Page 94: Implement Limitation Tables

    2. Implement limitation tables 2. Implement limitation tables IMPORTANT The KUBOTA tractor has been thoroughly tested for proper performance with implements sold or approved by KUBOTA. Do not use the following implements: • Implements which are not sold or approved by KUBOTA •...
  • Page 95 • Implement size may vary depending on soil operating conditions. The valve contains the weight of KUBOTA standard bucket. Reduce speed and trailer loads when operating in slippery conditions or when operating on slopes and using front wheel drive. 2-53...
  • Page 96  IMPLEMENT LIMITATIONS 2. GENERAL   2-54 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 97: Special Tools

     SPECIAL TOOLS 1. Special tools for engine 2. GENERAL SPECIAL TOOLS 1. Special tools for engine • 07909-31251 (G) • 07909-31271 (I) 1.1 Special use puller set • 07909-31281 (J) Use exclusively to pull out bearing, gears and other 1.3 Nozzle tester parts with ease.

  • Page 98: Valve Guide Replacing Tool

     SPECIAL TOOLS 2. GENERAL 1. Special tools for engine Pressure gauge full scale: More than 29.4 MPa (300 kgf/cm 4260 psi) PF 1/2 Copper gasket Flange (Material: Steel) Hex. nut 27 mm (1.1 in.) across the plate Adhesive application Fillet welding on the enter circumference Retaining nut 17 mm dia.

  • Page 99: Bushing Replacing Tool

     SPECIAL TOOLS 1. Special tools for engine 2. GENERAL D1005-E4 225 mm (8.86 in.) 70 mm (2.8 in.) 45 mm (1.8 in.) 20 mm dia. (0.79 in. dia.) 11.7 to 11.9 mm dia. (0.461 to 0.468 in. dia.) 6.50 to 6.60 mm dia. (0.256 to 0.259 in. dia.) 25 mm dia.

  • Page 100: Flywheel Stopper

     SPECIAL TOOLS 2. GENERAL 1. Special tools for engine [For small end bushing] 145 mm (5.71 in.) 20 mm (0.79 in.) 100 mm (3.94 in.) 19.90 to 19.95 mm dia. (0.7835 to 0.7854 in. dia.) 21.90 to 21.95 mm dia. (0.8622 to 0.8642 in.

  • Page 101: Crankshaft Bearing 1 Replacing Tool

     SPECIAL TOOLS 1. Special tools for engine 2. GENERAL [Press out] D902-E4 D1005-E4 135 mm (5.31 in.) 72 mm (2.8 in.) 40 mm radius (1.6 in. radius) 10 mm dia. (0.39 in. dia.) 22 mm (0.87 in.) 24 mm (0.94 in.) 20 mm dia. (0.79 in. dia.) 47.90 to 47.95 mm dia.

  • Page 102: Special Tools For Tractor

     SPECIAL TOOLS 2. GENERAL 2. Special tools for tractor Chamfer 1.0 mm (0.039 in.) 73.90 to 74.00 mm dia. (2.910 to 2.913 in. dia.) 69.80 to 69.90 mm dia. (2.748 to 2.751 in. dia.) 30 mm dia. (1.2 in. dia.) Chamfer 2.0 mm (0.079 in.) 18 mm (0.71 in.) 150 mm (5.91 in.) 188 mm (7.40 in.)

  • Page 103: Disassembling And Assembling Stand (1/2)

     SPECIAL TOOLS 2. Special tools for tractor 2. GENERAL 2.3 Disassembling and assembling stand (1/2) Use to disassembling transaxle assembly and to assembling transaxle assembly. ϕ9 mm (ϕ0.35 in.) 3 holes 225 mm (8.86 in.) ϕ13 mm (ϕ0.51 in.) 3 holes 140 mm (5.51 in.) 99.5 to 100.5 mm (3.92 to 3.95 in.) 59.5 to 60.5 mm (2.35 to 2.38 in.) 92.5 to 93.5 mm (3.65 to 3.68 in.)
  • Page 104  SPECIAL TOOLS 2. GENERAL 2. Special tools for tractor 397 mm (15.63 in.) 46 mm (1.81 in.) R25 mm (0.98 in.) 11 mm (0.43 in.) 20 mm (0.79 in.) 2-62 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 105: Disassembling And Assembling Stand (2/2)

     SPECIAL TOOLS 2. Special tools for tractor 2. GENERAL 2.4 Disassembling and assembling stand (2/2) Use to disassembling transaxle assembly and to assembling transaxle assembly. 311 mm (12.24 in.) 40 mm (1.57 in.) 38.1 mm (1.50 in.) 235 mm (9.25 in.) 170 mm (6.69 in.) 9.5 mm (0.37 in.) 6.4 mm (0.25 in.) 365 mm (14.37 in.)
  • Page 106  SPECIAL TOOLS 2. GENERAL 2. Special tools for tractor 50.8 mm (2.00 in.) 40 mm (1.57 in.) 38.1 mm (1.50 in.) 1.9 mm (0.07 in.) 4.8 mm (0.19 in.) 200 mm (7.87 in.) ϕ9 mm (ϕ0.35 in.), 3 holes 25 mm (0.98 in.) 39.5 to 40.5 mm (1.56 to 1.59 in.) 140 mm (5.51 in.) 260 mm (10.24 in.)

  • Page 107: Check And High Pressure Relief Valve Assembly Tool

     SPECIAL TOOLS 2. Special tools for tractor 2. GENERAL 2.5 Check and high pressure relief valve assembly tool Use for readjusting relief valve pressure. 30 mm (1.181 in.) 21 mm (0.827 in.) 1 mm (0.039 in.) 0.52 rad (30°) 50 mm dia. (1.969 in. dia.) 10 mm dia.
  • Page 108  SPECIAL TOOLS 2. GENERAL 2. Special tools for tractor Chamfer 1 mm (0.039 in.) Chamfer 0.4 mm (0.157 in.) Chamfer 3 mm (0.118 in.) Chamfer 2 mm (0.079 in.) 21.4 mm (0.843 in.) 19 mm (0.748 in.) 17 mm (0.669 in.) 10 mm (0.393 in.) 50 mm dia.

  • Page 109: Quick Coupler Cartridge Socket

     SPECIAL TOOLS 2. Special tools for tractor 2. GENERAL 2.6 Quick coupler cartridge socket Use for assembling and disassembling quick coupler. NOTE • This special tool is not provided, so make it referring to the figure. 9.61 to 9.72 mm (0.3780 to 0.3830 in.) 11 mm dia.
  • Page 110  SPECIAL TOOLS 2. GENERAL 2. Special tools for tractor 0.79 rad (45°) 16.26 to 16.35 mm dia. (0.640 to 0.644 in. dia.) 22.1 mm dia. (0.870 in. dia.) 33.0 mm (1.300 in.) 0.51 mm (0.020 in.) chamfer 25.3 mm dia. (0.997 in. dia.) 1.6 mm (0.063 in.) radius 22.3 to 22.4 mm (0.8780 to 0.8830 in.) 2-68...

  • Page 111: Engine

    ENGINE KiSC issued 03, 2019 A...

  • Page 112: Mechanism

     MECHANISM 1. Engine body 3. ENGINE MECHANISM 1. Engine body 1.1 Function of cylinder block The cylinder block is the main housing of engine and supports the other main parts. (1) Breather hose (4) Oil shield (2) Cylinder head cover (5) Rubber packing (3) Breather valve After its oil content is filtered by oil shield (4), the blow by gas in fed back to the intake manifold through...

  • Page 113: Function Of Piston

     MECHANISM 3. ENGINE 1. Engine body 1.4 Function of piston hardened cast iron. To reduce the wear on the ring, they are often plated with chrome on their contact The piston creates the forces for the suction, faces, or are coated their contact faces with compression, power and exhaust cycles.

  • Page 114: Function Of Camshaft

     MECHANISM 1. Engine body 3. ENGINE 1.9 Function of rocker arm of all the pistons into one rotary force that drives the machine. The rocker arm is an oscillating lever that conveys radial movement from the camshaft lobes into linear movement at the exhaust and intake valves to open and close them.

  • Page 115: Function Of Timing Gears

     MECHANISM 3. ENGINE 1. Engine body The flywheel periphery is inscribed with the marks showing fuel injection timing angle lines and top dead center mark TC. The flywheel (2) mounted on the rear of the crankshaft (1) is a stabilizer for the whole engine. 1.11 Function of timing gears The timing gears correctly control fuel injection to the cylinders and valve timing.

  • Page 116: Lubricating System

     MECHANISM 2. Lubricating system 3. ENGINE 2. Lubricating system 2.1 Overview of lubricating system (1) Rocker arm (5) Idle gear (9) Relief valve (13) Piston (2) Oil pressure switch (6) Crankshaft (10) Push rod (14) Connecting rod (3) Rocker arm shaft (7) Oil pump (11) Tappet (15) Oil filter cartridge (4) Valve...
  • Page 117  MECHANISM 3. ENGINE 2. Lubricating system The oil pump sucks lubricating oil from the oil pan through the oil strainer and the oil flows down to the filter cartridge, where it is further filtered. Then the oil is forced to crankshaft (6), connecting rods (14), idle gear (5), camshaft (12) and rocker arm shaft (3) to lubricate each part.

  • Page 118: Function Of Oil Strainer

     MECHANISM 2. Lubricating system 3. ENGINE 2.2 Function of oil strainer 2.4 Function of oil filter The oil strainer strains large particles from the oil. The oil filter is responsible for filtering impurities from the oil. (1) Oil strainer (2) Mesh screen The strainer (1) has a mesh screen (2) suitable for straining large particles from the oil and yet passes a sufficient quantity of oil to the inlet side of the oil pump.

  • Page 119: Function Of Relief Valve

     MECHANISM 3. ENGINE 2. Lubricating system 2.5 Function of relief valve The relief valve prevents the damage of the lubricating system due to high oil pressure. (1) Spring (3) Gasket (2) Poppet (4) Plug The valve is closed when the spring tension is greater than the oil pressure at the inlet.

  • Page 120: Cooling System

    The cooling system cools the engine while it operates to prevent overheating and keep a proper operating temperature. KUBOTA engines are used pressurized forced-circulation type. This system consists of a radiator (1), water pump (2), cooling fan (3), thermostat (4) and coolant temperature sensor (some models). The coolant is cooled through the radiator core, and the fan set behind the radiator pulls cooling air through the core to improve cooling.
  • Page 121  MECHANISM 3. ENGINE 3. Cooling system (1) Radiator (3) Cooling fan (5) Cylinder head (2) Water pump (4) Thermostat (6) Cylinder block 3-10 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 122: Function Of Water Pump

    The vacuum valve (3) in the cap opens to prevent a vacuum in the cooling system. (1) Cooling air (3) Fin (2) Tube The radiator core consists of water carrying tubes (2) and fins (3) at a right angle to the tubes. KUBOTA 3-11 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 123: Fuel System

     MECHANISM 3. ENGINE 4. Fuel system 4. Fuel system 4.3 Function of fuel feed pump An electromagnetic fuel feed pump is used when a fuel 4.1 Overview of fuel system tank is set below the pump of the engine. (1) Injection nozzle (5) Fuel feed pump Fuel in Fuel out...
  • Page 124  MECHANISM 4. Fuel system 3. ENGINE Uses as E-TVCS system, the small-sized DENSO made OPD mini nozzle is of a flat-cut-provided double throttle type. This type of nozzle is designed to control the injection quantity when the lift rate is low at start of the injection, and to cut down on the knocking sound caused by excessive fuel injection by giving the needle valve (8) section more taper than before to prevent the...
  • Page 125  MECHANISM 3. ENGINE 4. Fuel system 3-14 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 126: Servicing

     SERVICING 1. Troubleshooting for engine 3. ENGINE SERVICING 1. Troubleshooting for engine Refer- Probable cause and checking Symptom Solution ence procedure page Engine does not start 1. No fuel Fill 2. Air in fuel system Vent air 2-41 3. Fuel line clogged Clean or replace 2-39 4.
  • Page 127  SERVICING 3. ENGINE   Refer- Probable cause and checking Symptom Solution ence procedure page Engine revolution is not smooth 2. Air cleaner clogged Clean or replace 2-28 3. Fuel leak due to loose injec- Tighten retaining nut 3-43 tion pipe retaining nut 4.
  • Page 128  SERVICING   3. ENGINE Refer- Probable cause and checking Symptom Solution ence procedure page Excessive lubricant oil consump- 6. Oil leaking due to damaged Replace － tion seals or packing Fuel mixed into lubricant oil 1. Injection pump's plunger is Repair or replace 3-49 worn 2.
  • Page 129  SERVICING 3. ENGINE   Refer- Probable cause and checking Symptom Solution ence procedure page Engine overheated 10. Incorrect injection timing Adjust 3-34 11. Unsuitable fuel used Use specified fuel Battery quickly discharged 1. Battery electrolyte insufficient Fill distilled water and charge 2-27 2.

  • Page 130: Servicing Specifications For Engine

     SERVICING 2. Servicing specifications for engine 3. ENGINE 2. Servicing specifications for engine BX1880 (D722-E4) and BX2380 (D902-E4) Engine body Item Factory specification Allowable limit Cylinder head surface Flatness 0.005 mm － 0.002 in. Top clearance 0.55 to 0.70 mm － 0.022 to 0.027 in. Compression pressure [BX1880 (D722-E4)] 2.85 to 3.23 MPa 2.26 MPa...
  • Page 131  SERVICING 3. ENGINE   Item Factory specification Allowable limit Push rod Alignment 0.25 mm － 0.0098 in. Tappet to tappet guide Clearance 0.016 to 0.052 mm 0.10 mm 0.00063 to 0.0020 in. 0.0039 in. • Tappet guide I.D. 18.000 to 18.018 mm －...
  • Page 132  SERVICING   3. ENGINE Item Factory specification Allowable limit Piston ring gap [BX1880 (D722- Top ring 0.15 to 0.30 mm 1.2 mm E4)] 0.0059 to 0.011 in. 0.0472 in. Second ring 0.30 to 0.45 mm 1.25 mm 0.012 to 0.017 in. 0.0492 in.
  • Page 133  SERVICING 3. ENGINE   Item Factory specification Allowable limit • Crankshaft journal O.D. 43.934 to 43.950 mm － 1.7297 to 1.7303 in. • Crankshaft bearing 3 I.D. 43.978 to 43.993 mm － 1.7315 to 1.7320 in. Crankpin to crankpin bearing Oil clearance 0.020 to 0.051 mm 0.15 mm 0.00079 to 0.0020 in.
  • Page 134  SERVICING   3. ENGINE Fuel system Item Factory specification Allowable limit Injection pump Injection timing 0.3186 to 0.3447 rad － [BX1880 (D722-E4)] (18.25 to 19.75°) before T.D.C. Injection pump Injection timing 0.3360 to 0.3621 rad － [BX2380 (D902-E4)] (19.25 to 20.75°) before T.D.C.
  • Page 135  SERVICING 3. ENGINE   Item Factory specification Allowable limit Valve clearance (Cold) 0.145 to 0.185 mm － 0.00571 to 0.00728 in. Valve spring Free length 37.0 to 37.5 mm 36.5 mm 1.46 to 1.47 in. 1.44 in. Tilt － 1.0 mm 0.039 in.
  • Page 136  SERVICING   3. ENGINE Item Factory specification Allowable limit • Idle gear bushing I.D. 26.000 to 26.021 mm － 1.0237 to 1.0244 in. • Idle gear shaft 1 O.D. 25.967 to 25.980 mm － 1.0224 to 1.0228 in. Idle gear • Idle gear 1 Side clearance 0.20 to 0.51 mm...
  • Page 137  SERVICING 3. ENGINE   Item Factory specification Allowable limit Crankpin to crankpin bearing Oil clearance 0.029 to 0.091 mm 0.20 mm 0.0012 to 0.0035 in. 0.0079 in. • Crankpin O.D. 39.959 to 39.975 mm － 1.5732 to 1.5738 in. • Crankpin bearing I.D.
  • Page 138  SERVICING   3. ENGINE Item Factory specification Allowable limit Delivery valve Fuel tightness 10 seconds 5 seconds 13.73 → 12.75 MPa 13.73 → 12.75 MPa 140.0 → 130.0 kgf/cm 140.0 → 130.0 kgf/cm 1991 → 1849 psi 1991 → 1849 psi Injection nozzle Injection pressure 13.73 to 12.75 MPa...

  • Page 139: Tightening Torques For Engine

     SERVICING 3. ENGINE 3. Tightening torques for engine 3. Tightening torques for engine Tightening torques of screws, bolts and nuts on the table below are especially specified. NOTE • In removing and applying the bolts and nuts marked with "*", a pneumatic wrench or similar pneumatic tool, if employed, must be used with enough care not to get them seized.
  • Page 140  SERVICING   3. ENGINE Dimension Item N⋅m kgf⋅m lbf⋅ft × Pitch *Rocker arm bracket nut M7 × 1.0 22 to 26 2.2 to 2.7 16 to 19 *Fan drive pulley screw M14 × 1.5 236 to 245 24.0 to 25.0 174 to 180 Bearing case cover mounting screw M6 ×...

  • Page 141: Checking And Adjusting

     SERVICING 3. ENGINE 4. Checking and adjusting 4. Checking and adjusting BX2380 (D902-E4) 3.53 to 4.02 MPa 4.1 Engine body Factory specifi- 36.0 to 41.0 kgf/cm cation 512 to 583 psi Compression pres- 4.1.1 Checking compression pressure sure 2.55 MPa Allowable limit 26.0 kgf/cm NOTE 370 psi...

  • Page 142: Lubricating System

     SERVICING 4. Checking and adjusting 3. ENGINE Number of cylinders Adjustable cylin- Valve arrangement der location of pis- Intake valve Exhaust valve No. 1 ★ ★ No. 2 ☆ ★ No. 3 ★ ☆ Valve clearance marked with "★" can be adjusted. 1.

  • Page 143: Cooling System

     SERVICING 3. ENGINE 4. Checking and adjusting 3. If the oil pressure is less than the allowable limit, 98 N Depressing fan check the following. Specified force 10 kgf belt 22 lbf • Engine oil insufficient • Oil pump damaged • Oil strainer clogged Factory specifi- 7.0 to 9.0 mm Deflection (A)

  • Page 144: Checking Radiator Water Leakage

     SERVICING 4. Checking and adjusting 3. ENGINE (1) Radiator tester (2) Adapter (1) Radiator tester (2) Adapter 1. Set a radiator tester (1) and an adapter (2) on the Radiator water Factory specifi- No leak at specified pres- radiator cap. leakage test pres- cation sure sure...

  • Page 145: Fuel System

     SERVICING 3. ENGINE 4. Checking and adjusting 4. If the measurement is not within the factory specifications, replace the thermostat. Thermostat's valve 69.5 to 72.5 ℃ opening tempera- 157.1 to 162.5 ℉ ture Factory specifi- cation Temperature at 85 ℃ which thermostat 185 ℉...

  • Page 146: Checking Fuel Tightness Of Pump Element

    Factory specifi- Injection timing (19.25 to 20.75°) before cation assembly. repairs, strongly T.D.C. requested to contact a Kubota-authorized pump service shop. 4.4.2 Checking fuel tightness of pump element NOTE • Never try to disassemble the injection pump assembly. repairs, strongly requested to contact a Kubota-authorized pump service shop.

  • Page 147: Checking Nozzle Spraying Condition

    Factory specifi- 235 kPa replace the pump with a new one or repair with a (0.01 mm cation 2.4 kgf/cm Kubota-authorized pump service shop. (0.0004 in.)) 34 psi Pressure variation difference of adjusting washer thickness 10 seconds Factory specifi- 13.73 → 12.75 MPa 1.

  • Page 148: Checking Valve Seat Tightness

     SERVICING 4. Checking and adjusting 3. ENGINE 3. If the measurement is not within the factory 2. Raise the fuel pressure, and keep at specified specifications, replace the adjusting washer (1) in pressure for 10 seconds. the nozzle holder to adjust it. No fuel leak at Valve seat tight- Factory specifi-...

  • Page 149: Disassembling And Assembling

     SERVICING 3. ENGINE 5. Disassembling and assembling BX2380 shown 35 to 39 N⋅m Nozzle holder 3.5 to 4.0 kgf⋅m 26 to 28 lbf⋅ft 20 to 24 N⋅m Tightening tor- Overflow pipe re- 2.0 to 2.5 kgf⋅m taining nut 15 to 18 lbf⋅ft 49 to 68 N⋅m Nozzle holder as- 5.0 to 7.0 kgf⋅m...

  • Page 150: Removing Bonnet

     SERVICING 5. Disassembling and assembling 3. ENGINE 1. Remove the under panel (1). (1) Under panel (1) Front link (4) L.H. bonnet bracket 2. Disconnect the negative cable (3) from the battery (2) Front link bracket (5) R.H. bonnet bracket (2). (3) Bonnet guide rod 3.

  • Page 151: Disconnecting Wiring Harness And Ground Cables

     SERVICING 3. ENGINE 5. Disassembling and assembling 5.1.4 Disconnecting wiring harness and ground cables 1. Disconnect the starter connector and cable (1), oil pressure switch (2), alternator connector and cable (3) and coolant temperature switch (4). (1) Starter (4) Coolant temperature switch (2) Oil pressure switch (3) Alternator 2.

  • Page 152: Disconnecting Accelerator Wire

     SERVICING 5. Disassembling and assembling 3. ENGINE 2. Disconnect fuel filter (3) from engine. (1) Propeller shaft assembly (3) Propeller spacer (2) Bolt (1) Fuel return hose (3) Fuel filter (2) Fuel supply hose (When reassembling) 24 to 27 N⋅m Tightening tor- Propeller shaft as- 5.1.6 Disconnecting accelerator wire 2.4 to 2.8 kgf⋅m...

  • Page 153: Draining Coolant And Removing Outer Engine Parts

     SERVICING 3. ENGINE 5. Disassembling and assembling 2. Securely attach the lifting chain to the engine hooks (When reassembling) (2), (3) and separate the engine assembly with the radiator from the frame. 24 to 27 N⋅m Engine mounting 2.4 to 2.8 kgf⋅m 18 to 20 lbf⋅ft 24 to 27 N⋅m Tightening tor-...

  • Page 154: Disassembling Engine

     SERVICING 5. Disassembling and assembling 3. ENGINE 5.2 Disassembling engine 6. Remove the heat proof cover (7), the muffler (5) and the exhaust manifold. 5.2.1 Cylinder head and valve 5.2.1.1 Removing cylinder head cover 1. Disconnect the breather hose. 2. Remove the cylinder head cover nuts. 3.
  • Page 155  SERVICING 3. ENGINE 5. Disassembling and assembling (When reassembling) 20 to 24 N⋅m Overflow pipe re- • Send compressed air into the pipes to blow out 2.0 to 2.5 kgf⋅m taining nut 15 to 18 lbf⋅ft dust. Then, reassemble the pipes in the reverse order.
  • Page 156  SERVICING 5. Disassembling and assembling 3. ENGINE 5.2.1.5 Removing rocker arm and push rod 5.2.1.6 Removing cylinder head and cylinder head gasket (1) Rocker arm assembly (2) Push rod 1. Remove the rocker arm bracket screw [BX1880 (D722-E4) and BX2380 (D902-E4)] or the rocker arm bracket nut [BX2680 (D1005-E4)].
  • Page 157  SERVICING 3. ENGINE 5. Disassembling and assembling (When reassembling) 5.2.1.8 Removing valves NOTE IMPORTANT • Do not use O-ring on the pin pipe. • Do not change the combination of valve and • It is not necessary to retighten the cylinder valve guide. head screw and to readjust valve clearance after engine warmed up.

  • Page 158: Gear Case And Timing Gears

     SERVICING 5. Disassembling and assembling 3. ENGINE 2. Remove the thermostat assembly (4). components. Wait then for about 30 minutes, and pour oil in the crankcase. (When reassembling) • Apply a liquid gasket (Three Bond 1215 or Thickness equivalent) only at the thermostat cover side of the Liquid gasket Apply 5.0 mm...
  • Page 159  SERVICING 3. ENGINE 5. Disassembling and assembling 5.2.2.3 Removing gear case 5.2.2.4 Removing speed control plate (1) Speed control plate (2) Governor spring 1. Remove the engine stop solenoid. 2. Remove the speed control plate (1). (When reassembling) • Apply a liquid gasket (Three Bond 1215 or equivalent) to both sides of the solenoid cover gasket and control plate gasket.
  • Page 160  SERVICING 5. Disassembling and assembling 3. ENGINE 5.2.2.5 Removing injection pump (7) Groove (1) Notch (4) Start spring (2) Control rack pin (5) Thrust lever (3) Injection pump (6) Governor spring 1. Disconnect the start spring (4) on the thrust lever (5) side. 2.
  • Page 161  SERVICING 3. ENGINE 5. Disassembling and assembling 5.2.2.6 Removing cam gear, idle gear 1, 2 and governor gear (3) Cam gear 6. Remove the external circlip (10) from the governor shaft (11). 7. Remove the governor gear (6) with governor shaft (11). NOTE •...

  • Page 162: Piston And Connecting Rod

     SERVICING 5. Disassembling and assembling 3. ENGINE 5.2.3 Piston and connecting rod 5.2.3.2 Removing pistons 5.2.3.1 Removing connecting rod 1. Turn the flywheel and bring the piston to top dead center. 1. Remove the connecting rod cap. 2. Draw out the piston upward by lightly tapping it from the bottom of the crankcase with the grip of a (When reassembling) •...
  • Page 163  SERVICING 3. ENGINE 5. Disassembling and assembling (1) Piston ring compressor (12) Manufacturer's mark • When installing the oil ring onto the piston, place • Before inserting the piston into the cylinder, apply the expander joint (10) on the opposite side of the enough engine oil to the piston.

  • Page 164: Flywheel And Crankshaft

     SERVICING 5. Disassembling and assembling 3. ENGINE • Apply engine oil to the threads and the undercut surface of the flywheel screw and fit the screw. 54 to 58 N⋅m Tightening tor- Flywheel screw 5.5 to 6.0 kgf⋅m 40 to 43 lbf⋅ft 5.2.4.2 Removing bearing case cover (8) Mark (9) Fan-shaped concave...
  • Page 165  SERVICING 3. ENGINE 5. Disassembling and assembling • Install the crankshaft assembly, aligning the screw hole of main bearing case with the screw hole of crankcase. • Clean the oil passage of the crankshaft with compressed air. BX1880 and BX2380 27 to 30 N⋅m Tightening tor- Main bearing case 2.8 to 3.0 kgf⋅m...

  • Page 166: Servicing

     SERVICING 6. Servicing 3. ENGINE • Apply clean engine oil on the bearings. • Install the main bearing case assemblies in the original positions. Since diameters of main bearing cases vary, install them in order of markings (b) ([A], [B], [C]) from the gear case side.

  • Page 167: Checking Cylinder Head Flaw

     SERVICING 3. ENGINE 6. Servicing • Be sure to check the valve recessing after 6.1.3 Checking cylinder head flaw correcting. 1. Clean the cylinder head surface. 2. Place a straightedge on the cylinder head's four sides and two diagonal as shown in the figure. (1) Red permeative liquid (3) White developer (2) Detergent...

  • Page 168: Checking Valve Recessing

     SERVICING 6. Servicing 3. ENGINE 6.1.4 Checking valve recessing 6.1.5 Checking clearance between valve stem and valve guide 1. Remove carbon from the valve guide section. 2. Measure the valve stem O.D. with an outside micrometer. BX1880 and BX2380 Factory specifi- 5.968 to 5.980 mm Valve stem O.D.

  • Page 169: Replacing Valve Guide

     SERVICING 3. ENGINE 6. Servicing 4. If the clearance exceeds the allowable limit, replace BX1880 and BX2380 the valves. If it still exceeds the allowable limit, Valve guide I.D. replace the valve guide. Factory specifi- 6.010 to 6.025 mm (Intake and ex- cation 0.2366 to 0.2372 in.

  • Page 170: Correcting Valve

     SERVICING 6. Servicing 3. ENGINE 6.1.8 Correcting valve NOTE • Before correcting the valve and seat, check the valve stem and the I.D. of valve guide section, and repair them if necessary. 1. Correct the valve with a valve refacer. (1) Valve seat width (b) 0.79 rad (45°) or 1.0 rad (2) Identical dimensions (60°)

  • Page 171: Lapping Valve

     SERVICING 3. ENGINE 6. Servicing BX1880 and BX2380 6.1.10 Lapping valve Factory specifi- 31.3 to 31.8 mm IMPORTANT cation 1.24 to 1.25 in. • When valve lapping is performed, be sure to Free length (B) 28.4 mm check the valve recessing and adjust the valve Allowable limit 1.12 in.

  • Page 172: Checking Oil Clearance Between Rocker Arm And Rocker Arm Shaft

     SERVICING 6. Servicing 3. ENGINE 3. If the measurement is less than the allowable limit, BX2680 replace it. Factory specifi- 12.000 to 12.018 mm Rocker arm I.D. cation 0.47244 to 0.47314 in. BX1880 and BX2380 65 N / 27.0 mm 3. If the oil clearance exceeds the allowable limit, Factory specifi- 6.6 kgf / 27.0 mm replace the rocker arm and measure the oil...

  • Page 173: Checking Oil Clearance Between Tappet And Tappet Guide Bore

     SERVICING 3. ENGINE 6. Servicing 6.2 Timing gears, camshaft and 6.1.15 Checking oil clearance between governor gear tappet and tappet guide bore 6.2.1 Checking timing gear backlash 1. Measure tappet O.D. with outside micrometer. BX1880 and BX2380 Factory specifi- 17.966 to 17.984 mm Tappet O.D.

  • Page 174: Checking Idle Gear 1 Side Clearance

     SERVICING 6. Servicing 3. ENGINE 3. If the backlash exceeds the allowable limit, check 2. Measure the side clearance by moving the idle gear the oil clearance of the shafts and the gear. to the front and rear. 3. If the measurement exceeds the allowable limit, BX1880 and BX2380 replace the idle gear collar.

  • Page 175: Checking Camshaft Alignment

     SERVICING 3. ENGINE 6. Servicing BX2680 6.2.4 Checking camshaft alignment Factory specifi- 28.80 mm cation 1.134 in. Cam height of in- take 28.75 mm Allowable limit 1.132 in. Factory specifi- 29.00 mm cation 1.142 in. Cam height of ex- haust 28.95 mm Allowable limit 1.140 in.

  • Page 176: Checking Oil Clearance Between Idle Gear 1 Shaft And Idle Gear Bushing

     SERVICING 6. Servicing 3. ENGINE 2. Measure the cylinder block bore I.D. for camshaft 6.2.7 Checking oil clearance between idle with a cylinder gauge, and calculate the oil gear 1 shaft and idle gear bushing clearance. 1. Measure the idle gear shaft O.D. with an outside BX1880 and BX2380 micrometer.

  • Page 177: Replacing Idle Gear Bushing

     SERVICING 3. ENGINE 6. Servicing BX2680 6.2.8 Replacing idle gear bushing Factory specifi- 22.000 to 22.013 mm cation 0.86615 to 0.86665 in. Piston pin bore I.D. 22.03 mm Allowable limit 0.8673 in. 6.3.2 Checking oil clearance between piston pin and small end bushing (A) When removing (B) When installing (When removing)

  • Page 178: Replacing Small End Bushing

     SERVICING 6. Servicing 3. ENGINE 3. If the oil clearance exceeds the allowable limit, BX1880 and BX2380 replace the bushing. If it still exceeds the allowable Oil clearance be- Factory specifi- 0.015 to 0.075 mm limit, replace the piston pin. tween piston pin cation 0.00059 to 0.0029 in.

  • Page 179: Checking Piston Ring Gap

     SERVICING 3. ENGINE 6. Servicing 3. Put a gauge over the piston pin, and move it BX2380 against the face plate. 0.20 to 4. If the gauge does not fit squarely against the face Factory speci- 0.35 mm plate, measure the space between the pin of the fication 0.0079 to Top ring...

  • Page 180: Crankshaft

     SERVICING 6. Servicing 3. ENGINE 6.4 Crankshaft 2. Measure the clearance between the ring and the groove with a feeler gauge or depth gauge. 6.4.1 Checking crankshaft side clearance 3. If the clearance exceeds the allowable limit, replace the piston ring. 1. Set a dial indicator with its tip on the end of the BX1880 and BX2380 crankshaft.

  • Page 181: Checking Crankshaft Alignment

     SERVICING 3. ENGINE 6. Servicing 4. If the same size bearing is useless because of the Oversize dimensions of crankshaft journal crankshaft journal wear, replace it with an oversize (BX2680) one referring to the table and figure. 0.20 mm 0.40 mm Oversize (Reference) 0.0079 in.
  • Page 182  SERVICING 6. Servicing 3. ENGINE Undersize crankpin bearing (BX1880 and BX2380) BX1880 and BX2380 Code num- 33.959 to 33.975 mm Undersize Bearing Marking Crankpin O.D. 1.3370 to 1.3375 in. Factory specifi- cation 0.20 mm Crankpin Crankpin bearing 33.995 to 34.010 mm 15861-22970 020 US 0.0079 in.

  • Page 183: Checking Oil Clearance Between Crankshaft Journal And Crankshaft Bearing 1

     SERVICING 3. ENGINE 6. Servicing 0.20 mm 0.40 mm Undersize 0.0079 in. 0.016 in. 39.759 to 39.559 to 39.775 mm dia. 39.575 mm dia. Dimension C 1.5654 to 1.5659 in. 1.5575 to 1.5580 in. dia. dia. The crankshaft journal must be fine-finished to higher than Rmax. = 0.8S 6.4.4 Checking oil clearance between crankshaft journal and crankshaft bearing...

  • Page 184: Replacing Crankshaft Bearing 1

     SERVICING 6. Servicing 3. ENGINE 4. If the same size bearing is useless because of the Undersize dimensions of crankshaft journal crankshaft journal wear, replace it with an undersize (BX2380) one referring to the table and the figure. 0.20 mm 0.40 mm Undersize (Reference) 0.0079 in.

  • Page 185: Checking Oil Clearance Between Crankshaft Journal And Crankshaft Bearing 2 And Crankshaft Bearing 3

     SERVICING 3. ENGINE 6. Servicing BX2380 Crankshaft journal 43.934 to 43.950 mm O.D. (Flywheel 1.7297 to 1.7303 in. side) Crankshaft bearing 43.978 to 43.993 mm 2 I.D. 1.7315 to 1.7320 in. Factory specifi- cation Crankshaft journal 43.934 to 43.950 mm O.D. (Intermedi- 1.7297 to 1.7303 in.
  • Page 186  SERVICING 6. Servicing 3. ENGINE 5. If the same size bearing is useless because of the Undersize dimensions of crankshaft journal crankshaft journal wear, replace it with an undersize (BX1880) one referring to the table and figure. 0.20 mm 0.40 mm Undersize (Reference) 0.0079 in.

  • Page 187: Cylinder

     SERVICING 3. ENGINE 6. Servicing BX2380 0.20 mm 0.40 mm Undersize 0.0079 in. 0.016 in. Factory specifi- 72.000 to 72.019 mm cation 2.8347 to 2.8353 in. 51.721 to 51.521 to Cylinder liner I.D. 51.740 mm dia. 51.540 mm dia. Dimension D 72.150 mm 2.0362 to 2.0370 in.

  • Page 188: Oil Pump

     SERVICING 6. Servicing 3. ENGINE 1. When the cylinder is worn beyond the allowable limit, bore and hone it to the specified dimension. BX1880 Factory specifi- 67.250 to 67.269 mm cation 2.6477 to 2.6483 in. Cylinder liner I.D. 67.400 mm Allowable limit 26535 in.

  • Page 189: Checking Clearance Between Rotor And Cover

     SERVICING 3. ENGINE 6. Servicing 6.6.3 Checking clearance between rotor and cover (1) Relief valve (3) Spring (2) Joint 1. Remove the oil filter base. 2. Check the relief valve for dirt, and the seat and ball 1. Put a strip of plastigauge onto the rotor face with for damage.

  • Page 190: Transaxle

    TRANSAXLE KiSC issued 03, 2019 A...

  • Page 191: Mechanism

     MECHANISM 1. Structure of transaxle 4. TRANSAXLE MECHANISM 1. Structure of transaxle (1) Hydrostatic transmission (4) Front wheel drive gear section (7) Rear PTO section Front side (2) PTO clutch section (5) Mid-PTO section (8) Differential gear section Rear side (3) Range gear shift section (6) PTO gear shift section (9) Brake section BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX...

  • Page 192: Traveling System

     MECHANISM 4. TRANSAXLE 2. Traveling system 2. Traveling system 2.1 Hydrostatic transmission 2.1.1 Structure of hydrostatic transmission The hydrostatic transmission consists of variable displacement piston pump, fixed displacement piston motor and valve system. (1) Check and high pressure relief (6) Thrust ball bearing (12) Circlip (18) Ball bearing valve...

  • Page 193: Oil Flow Of Hydrostatic Transmission

     MECHANISM 2. Traveling system 4. TRANSAXLE 2.1.2 Oil flow of hydrostatic transmission The pump and motor are joined in a closed hydraulic loop and most of oil circulates within the main oil circuit. A little oil lubricates and oozes out from the clearance between the moving parts of the case. Then oil in the main oil circuit of the HST needs to be supplied a want.
  • Page 194  MECHANISM 4. TRANSAXLE 2. Traveling system 2.1.2.1 Neutral position When the speed control pedal is in neutral, the variable swashplate is not tilted as shown in figure. The pump pistons only rotate with cylinder block without reciprocating. Since the oil is not being pumped to the motor, the cylinder block in the motor is stationary and the output shaft does not move.
  • Page 195  MECHANISM 2. Traveling system 4. TRANSAXLE 2.1.2.2 Forward position When the speed control pedal is stepped on and in forward, the variable swashplate is tilted as shown in figure. As the pump cylinder block rotates with the input shaft, oil is forced out of pump port B at high pressure. As pressure oil enters motor port D, the pistons, which align with port D, are pushed against the swashplate and slide down the inclined surface.
  • Page 196  MECHANISM 4. TRANSAXLE 2. Traveling system 2.1.2.3 Reverse position When the speed control pedal is stepped on and in reverse, the variable swashplate is tilted as shown in figure. As the pump cylinder block rotates with the input shaft, oil is forced out of pump port A at high pressure. As pressure oil enters motor port C, the pistons, which align with port C, are pushed against the swashplate and slide down the inclined surface.
  • Page 197  MECHANISM 2. Traveling system 4. TRANSAXLE 2.1.2.4 Relief (reverse position) When the speed control pedal is in reverse, the variable swashplate is tilted as shown in figure. As the pump cylinder block rotates with the input shaft, oil is forced out of pump port A at high pressure. As pressure oil enters motor port C, the pistons, which align with port C, are pushed against the swashplate and slide down the inclined surface.

  • Page 198: Structure Of Hst Control Linkage

     MECHANISM 4. TRANSAXLE 2. Traveling system 2.1.3 Structure of HST control linkage The speed control pedal (4) and the trunnion arm are linked with the HST pedal link (8) and the speed change rod (9). As the front of the pedal is depressed, the swashplate connected to the trunnion arm (2) rotates forward...

  • Page 199: Speed Set Linkage

     MECHANISM 2. Traveling system 4. TRANSAXLE 2.1.4 Speed set linkage 2.1.4.1 Speed set When pushing and holding the speed set rod (1) and depressing the speed control pedal (2), the desired speed is set. When pushing the speed set rod (1), the cruise plate (5) is rotated counter clockwise. When depressing the speed control pedal (2) forward, the HST pedal link clockwise.
  • Page 200  MECHANISM 4. TRANSAXLE 2. Traveling system 4-10 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 201  MECHANISM 2. Traveling system 4. TRANSAXLE (1) Speed set rod (5) Cruise plate (9) Trunnion arm (C) Speed control pedal Forward (2) Speed control pedal (6) HST pedal link (10) Release plate (D) Cruise lock Locked (3) Cruise lock (7) Speed change rod (A) Speed set rod OFF (4) Cruise lock (8) Damper...

  • Page 202: Range Gear Shift Section

     MECHANISM 4. TRANSAXLE 2. Traveling system 2.1.4.2 When brake pedal is depressed When the brake pedal (2) is depressed, the release plate (1) located under the brake pedal (2) is pushed down. Since the cruise plate (3) rotates, the cruise lock (4) and (6) between the cruise plate (3) and the HST pedal link (5) are released.

  • Page 203: Front Wheel Drive Section

     MECHANISM 2. Traveling system 4. TRANSAXLE 2.3 Front wheel drive section 2.3.1 Structure of front wheel drive 2-wheel drive or 4-wheel drive is selected by changing the position of 19T shifter gear (2) with the front wheel drive lever. (1) Front wheel drive shaft (4) 12T gear (2) 19T shifter gear (5) 13T-25T gear shaft...

  • Page 204: Differential Gear Section

     MECHANISM 4. TRANSAXLE 2. Traveling system 2.4 Differential gear section 2.4.1 Structure of differential gears During straight running Rotation of the spiral bevel pinion is transmitted to the 37T spiral bevel gear (3), 10T final gear shaft (4), 66T final gear (7) and differential case (1). When road resistance to the right and left wheels are equal, differential pinions (2), (8) and differential side gears (5), (9) all rotate as a unit.
  • Page 205  MECHANISM 2. Traveling system 4. TRANSAXLE (1) Differential case (4) 10T final gear shaft (7) 66T final gear (2) Differential pinion (5) Differential side gear (8) Differential pinion (3) 37T spiral bevel gear (6) Differential pinion shaft (9) Differential side gear 4-15 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 206: Structure Of Differential Lock

     MECHANISM 4. TRANSAXLE 2. Traveling system 2.4.2 Structure of differential lock When resistance to the right and left tires are greatly different due to ground conditions or type of work, the tire with less resistance slips and prevents the tractor from moving ahead. To compensate for this drawback, the differential lock restricts the differential action and causes both rear axles to rotate as a unit.

  • Page 207: Brake Section

     MECHANISM 2. Traveling system 4. TRANSAXLE 2.5 Brake section 2.5.1 Structure of brake system The mechanical wet disc brakes are used for the travelling brake. The brake is operated by the brake pedal (13) through the mechanical linkages and provide stable braking and require little adjustment. The brake body is incorporated in the transmission case and axle cover filled with transmission oil.
  • Page 208  MECHANISM 4. TRANSAXLE 2. Traveling system (1) Rear axle L.H. (6) Actuator (11) Brake disc Connects with brake cam lev- (2) Final gear shaft (7) Steel ball (12) Internal circlip er and brake rod. (3) Shim (8) Cam lever (13) Brake pedal (4) Bearing holder (9) O-ring (14) Parking brake lock pedal...

  • Page 209: Pto System

     MECHANISM 3. PTO system 4. TRANSAXLE 3. PTO system 3.1 Structure of PTO system The BX 80 series equipped with hydraulic independent PTO clutch (wet multi-plates type). Therefore, the engine power engages or disengages to the PTO shafts without stopping the tractor movement. The PTO clutch pack (2) has four clutch discs, four drive plates, pressure plate, clutch piston and so on.

  • Page 210: Function Of Pto Clutch Relief Valve

     MECHANISM 4. TRANSAXLE 3. PTO system the HST pump shaft (1) through the PTO clutch to the 3.1.1 Function of PTO clutch relief valve clutch gear (2) and the PTO shafts. The PTO clutch relief valve is provided to control the PTO operating pressure. When the oil pressure exceed the relief valve setting pressure, relief valve opens and the oil flows into PTO clutch and hydrostatic transmission.

  • Page 211: Structure Of Mid And Rear Pto

     MECHANISM 3. PTO system 4. TRANSAXLE 3.2 Structure of mid and rear PTO Three kinds of power flow are selected by operating the PTO select lever to shift the 28T PTO select gear (8) on the 11T gear shaft (9). (1) HST pump shaft (4) Rear PTO shaft (7) Mid-PTO shaft (2) 12T clutch gear...

  • Page 212: Others

     MECHANISM 4. TRANSAXLE 4. Others 4. Others 4.1 Hydraulic pump drive gear section 4.1.1 Structure of hydraulic pump drive gear The hydraulic pump (7) is mounted to the transmission case (10) and driven by the hydraulic pump drive gear (5). The spline boss (2) mounted on the HST pump shaft drives the hydraulic pump drive gear (5) mounted on the hydraulic pump drive gear shaft (4) through the idle gear (3).

  • Page 213: Servicing

     SERVICING 1. Troubleshooting for transaxle 4. TRANSAXLE SERVICING 1. Troubleshooting for transaxle Hydrostatic transmission Refer- Probable cause and checking Symptom Solution ence procedure page System will not operate in either 1. Oil level is low Check oil level or fill oil to proper 2-34 direction level...
  • Page 214  SERVICING 4. TRANSAXLE   Refer- Probable cause and checking Symptom Solution ence procedure page Loss of power 4. Check and high pressure relief Inspect or replace check and 4-57 valve does not move smoothly high pressure relief valve 5. Component parts damaged Replace hydrostatic transmission 4-43 assembly...
  • Page 215  SERVICING   4. TRANSAXLE Differential gear section Refer- Probable cause and checking Symptom Solution ence procedure page Excessive or unusual noise all 1. Improper backlash between Adjust 4-62 the time spiral bevel pinion and bevel gear 2. Improper backlash between Adjust 4-61 differential pinion and differential side gear...
  • Page 216  SERVICING 4. TRANSAXLE   Brake section Refer- Probable cause and checking Symptom Solution ence procedure page Brake drags 1. Brake pedal free travel too Adjust 2-31 small 2. Ball holes of actuator for un- Replace 4-63 even wear 3. Brake pedal return spring Replace 4-41 weaken or broken...

  • Page 217: Servicing Specifications For Transaxle

     SERVICING 2. Servicing specifications for transaxle 4. TRANSAXLE 2. Servicing specifications for transaxle Item Factory specifications Allowable limit Charge relief valve [oil tempera- Setting pressure 0.55 to 0.75 MPa － ture at 50 ℃ (122 ℉)] 5.6 to 7.7 kgf/cm 80 to 100 psi High pressure relief valve (forward Setting pressure 20.1 to 21.1 MPa...

  • Page 218: Tightening Torques For Transaxle

     SERVICING 4. TRANSAXLE 3. Tightening torques for transaxle 3. Tightening torques for transaxle Dimension Item N⋅m kgf⋅m lbf⋅ft × Pitch Charge relief valve checking plug R 1/4 30 to 44 3.0 to 4.5 22 to 32 Hexagon socket head plug R 1/4 30 to 44 3.0 to 4.5 22 to 32...

  • Page 219: Checking And Adjusting

     SERVICING 4. Checking and adjusting 4. TRANSAXLE 4. Checking and adjusting 4. Adjust the stopper bolt (for the forward) length (A) and lock it securely. 4.1 Adjusting maximum speed Reference IMPORTANT 17.0 mm Stopper bolt length Forward 0.669 in. • Speed control pedal should contact with adjusting bolt (A) and / or (B), when depress the 5.

  • Page 220: Checking And Adjusting Hst Neutral Spring (Dynamic Braking)

     SERVICING 4. TRANSAXLE 4. Checking and adjusting (Reverse to neutral position) 10. Depress the speed control pedal to reverse speed position, and release the foot from the speed control pedal. Check the rear axle (or the wheel) stops rotating. If the rear axle (or the wheel) does not stop rotating, adjust the locking screw (4) to stop rotating.

  • Page 221: Checking Charge Relief Pressure

     SERVICING 4. Checking and adjusting 4. TRANSAXLE Checking the HST neutral spring tension 1. Start the engine and hold the maximum engine speeds. 2. Operate the machine on the concrete level ground. 3. Shift the range gear shift lever to hi position. 4.

  • Page 222: Checking High Relief Pressure (Forward)

     SERVICING 4. TRANSAXLE 4. Checking and adjusting 1. Remove the plug (R 1/4) (1) from the front cover, then install the adaptor (R 1/4) and pressure gauge. (1) Plug 2. Set the range gear shift lever to neutral position. 3. Start the engine and operate it at the maximum speed.

  • Page 223: Checking High Relief Pressure (Reverse)

    HST does not work due to its loose hexagon socket head screw) IMPORTANT • KUBOTA does not recommend readjusting the relief valve. KUBOTA recommends replacing it with genuine parts. • As the HST may be damaged if the pressure is set to high by mistake, be careful when adjusting it.
  • Page 224  SERVICING 4. TRANSAXLE 4. Checking and adjusting 1. Measure the pre-adjustment distance (A). 2. Compress the spring of the relief valve with a relief valve assembling tool (3). 3. Find the distance (A) by turning the poppet (4) with a screwdriver. Distance (A) of re- 39.10 to 39.20 mm lief valve (For- 1.540 to 1.543 in.

  • Page 225: Checking Pto Clutch Operating Pressure

     SERVICING 4. Checking and adjusting 4. TRANSAXLE 4.8 Checking PTO clutch operating 4.9 Adjusting brake pedal free travel pressure CAUTION • Stop the engine, remove the key, lower the CAUTION implement to the ground, and chock the wheels • When checking, park the tractor on flat ground, before checking brake pedal.

  • Page 226: Disassembling And Assembling

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling 5. Disassembling and assembling 5.1 Separating transaxle 5.1.1 Draining transmission fluid CAUTION • Be sure to stop the engine before checking and changing the transmission fluid. 1. Place oil pan under the tractor. 2. Remove the drain plug (1) at the bottom of the (2) Filling plug (A) Oil level is acceptable within transmission case.

  • Page 227: Removing Lift Rod And Lower Link

     SERVICING 5. Disassembling and assembling 4. TRANSAXLE 3. Disconnect the positive cable (4) from the battery (2) and remove the battery. (8) Bush (9) Shaft (2) Battery (4) Positive cable 5.1.4 Removing ROPS (3) Negative cable 1. Disconnect the R.H and L.H. hazard lamp/turn signals (3), (4) from the wire harness.

  • Page 228: Removing Step

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling 2. Remove the snap pins (2) to remove the seat (1). NOTE • 12 V outlet connector is near the L.H. tail lamp connector. 3. Remove the L.H. lever grips (3). (1) Seat (2) Snap pin 5.1.6 Removing step (1) Tail lamp (6) Lowering speed adjusting...

  • Page 229: Removing Rear Wheel

     SERVICING 5. Disassembling and assembling 4. TRANSAXLE 3. Disconnect the fuel sensor connectors (4) and safety switch connector (7). (1) L.H. rear wheel (2) R.H. rear wheel (When reassembling) (1) R.H. lever guide stay (6) Fuel return hose (2) Fuel tube cover (7) Connector 109 to 129 N⋅m (3) Seat stopper...

  • Page 230: Removing Transaxle Assembly

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling 2. Remove the parking brake return spring (4) and the fender brackets (1), (3). (3) Hoses (4) Brake rod 4. Disconnect the connectors (5). (1) Fender bracket L.H. (4) Return spring 5. Remove the rear coupling mounting bolt (8). (2) Hitch plate 6.

  • Page 231: Removing Brake Pedal

     SERVICING 5. Disassembling and assembling 4. TRANSAXLE (When reassembling) • Tighten the smaller bolt (M12) first. • Before mounting the transaxle assembly on the tractor main frame, check the flatness of the frame brackets with a straight edge securely. (10) Frame bracket (1) Parking lock (3) Parking arm Transaxle assem-...

  • Page 232: Removing Propeller Shaft

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling 5.1.14 Removing propeller shaft 5.1.16 Removing speed control pedal, HST damper, and cruise rod 1. Remove the speed control pedal (1). 2. Remove the rue ring cotter (4). 3. Remove the HST dumper (2). (1) Front coupling (3) HST fan (2) Rear coupling 1.

  • Page 233: Hydrostatic Transmission

     SERVICING 5. Disassembling and assembling 4. TRANSAXLE 5.2 Hydrostatic transmission 5.2.2 Removing PTO clutch valve 5.2.1 Removing levers and mower lift arm (1) Range gear shift lever (3) Front wheel drive lever (2) Hydraulic control lever 1. Tap out the spring pin from the range gear shift lever (1) and front wheel drive lever (3), then remove the both levers.

  • Page 234: Removing Oil Cooler Cover

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling 5.2.3 Removing oil cooler cover 5.2.4 Removing center section and valve plates (1) Center section (2) Valve plate 1. Remove the valve plates (2). (When reassembling) (1) HST front cover (4) Internal circlip (2) Transaxle assembly (5) Oil seal (3) Bolt (6) Center section...

  • Page 235: Removing Check And High Pressure Relief Valve Plug

     SERVICING 5. Disassembling and assembling 4. TRANSAXLE • Since there is an orifice in the check and relief 5.2.5 Removing check and high pressure valve body (reverse) (5), re-install the check and relief valve plug relief valve (4), (5) to their original positions. 1.

  • Page 236: Removing Cylinder Block And Piston

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling 2. Remove the O-ring (2). 5.2.9 Removing swashplate and trust roller bearing (2) O-ring 3. Remove the cylinder block assembly (4), (5) from the transaxle. (When reassembling) • Turn the disassembling and the assembling stand vertically.

  • Page 237: Removing 4Wd Detent Ball

     SERVICING 5. Disassembling and assembling 4. TRANSAXLE 1. Remove the circlip (6) from the pump shaft (3) and the motor shaft (1). (1) 4WD detent bolt (4) Transaxle front case (2) Detent spring (3) Detent ball (6) Circlip 5.2.11 Removing neutral arm and trunnion 2.

  • Page 238: Hydraulic Cylinder

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling 5. Remove the neutral adjuster (5) and the neutral arm (When reassembling) (3). • Apply liquid gasket (Three Bond 1208D or equivalent) to the joint surface of the transaxle case 6. Remove the trunnion arm (6). to the hydraulic cylinder.
  • Page 239  SERVICING 5. Disassembling and assembling 4. TRANSAXLE (1) 4WD detent bolt (8) Front wheel drive shaft (2) Detent spring (9) Spiral bevel pinion shaft (3) Detent ball (10) HST motor shaft (4) Transaxle case front cover (11) Mid-PTO shaft (5) Circlip (12) Mid-PTO idle gear shaft (6) HST pump shaft (PTO shaft) (13) PTO select shaft (7) Front cover mounting bolt...

  • Page 240: Removing Hydraulic Pump Assembly

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling 5.4.2 Removing hydraulic pump assembly (1) Hydraulic pump assembly (When reassembling) • Apply transmission oil to the O-rings. • Since the mounting bolt (2) is installed through the hydraulic pump to the transaxle case, bind the sealing tape to the mounting bolt (2) securely.

  • Page 241: Removing Rear Pto Cover Assembly

     SERVICING 5. Disassembling and assembling 4. TRANSAXLE 5.4.3 Removing rear PTO cover assembly (1) Bolt (5) Rear PTO shaft (2) Rear PTO cover (6) Oil seal (3) Bearing (7) Vinyl tape (4) 11T PTO select shaft 1. Remove the rear PTO cover mounting bolts (1). 2.

  • Page 242: Removing Rear Axle Case (R.h.)

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling (1) Rear axle (4) Ball bearing (2) Oil seal (5) Rear axle case (3) Internal circlip 1. Draw out the oil seal with a screw driver. 2. Remove the internal circlip from the rear axle case. 3.

  • Page 243: Removing 66T Final Gear

     SERVICING 5. Disassembling and assembling 4. TRANSAXLE 2. Remove the rear axle case (R.H.) (1) as an assembly from the transaxle case. (1) Rear axle case (R.H.) 3. Remove the 37T spiral bevel gear (2). NOTE • Since the adjusting shims are installed behind the 37T spiral bevel gear, check the shims.

  • Page 244: Removing Rear Axle Case, R.h. And Brake

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling 6. Remove the differential pinions (12), (16), the differential pinion washers (13), (17), differential side gears (9), (14) and the differential side gear washers (10), (15). (When reassembling) • Install the differential pinion and differential gear, aligning the parting marks.

  • Page 245: Removing Pto Clutch Assembly

     SERVICING 5. Disassembling and assembling 4. TRANSAXLE 5.4.8 Removing PTO clutch assembly (1) Pump shaft (PTO clutch (10) Brake plate shaft) (11) Clutch piston (2) Bearing (12) Separate plate (3) Clutch gear (13) Disc plate (4) Clutch pack (14) Backing plate (5) Bearing (15) Internal circlip (6) Seal ring (16) Brake spring...

  • Page 246: Assembling Front Wheel Drive Shaft, Shifter, Spiral Bevel Pinion Shaft And Mid-Pto Shaft

     SERVICING 4. TRANSAXLE 5. Disassembling and assembling (1) PTO select arm 2. Install the range shift arm (2) and the front wheel drive shift arm (3). 3. Install the idle gear shaft. NOTE • Install the rear PTO cover and the PTO select gear shaft before installing HST pump shaft assembly.

  • Page 247: Servicing

     SERVICING 6. Servicing 4. TRANSAXLE 3. Install the mid-PTO idle gear shaft (5) and the mid- 6.1.2 Checking charge relief valve PTO shaft (6) and the HST motor shaft (4) together. (1) Charge relief valve (3) Plug (2) Spring 1. Check the charge relief valve (1) and the spring (2). 2.

  • Page 248: Checking Cylinder Block Assembly

     SERVICING 4. TRANSAXLE 6. Servicing 3. Check the thrust plate (4) for scratches and 6.1.4 Checking cylinder block assembly excessive wear. If it is worn or scored, replace it. IMPORTANT 4. Check the cradle bearing (5) for excessive wear. If it • Do not interchange the pistons between the is worn, replace it.

  • Page 249: Checking Needle Bearing

     SERVICING 6. Servicing 4. TRANSAXLE 3. If the ball bearing or the needle bearing is worn, replace it. 6.1.7 Checking needle bearing 2. If the thickness is less than the allowable limit, replace it. Factory specifi- 1.50 to 1.70 mm cation 0.0591 to 0.0669 in. Thickness of PTO clutch disc 1.35 mm...

  • Page 250: Checking Flatness Of Clutch Piston, Pressure Plate And Steel Plate

     SERVICING 4. TRANSAXLE 6. Servicing 6.2.4 Checking flatness of clutch piston, 6.2.6 Checking PTO brake disc wear pressure plate and steel plate 1. Measure the PTO brake disc thickness with a vernier caliper. 1. Place the part on a surface plate. 2. If the thickness is less than allowable limit, replace 2.

  • Page 251: Checking Clearance Between Differential Case And Differential Side Gear

     SERVICING 6. Servicing 4. TRANSAXLE 6.2.8 Checking clearance between Differential pinion Factory specifi- 19.959 to 19.980 mm shaft O.D. cation 0.78579 to 0.78661 in. differential case and differential side gear 2. Measure the differential pinion I.D. with a cylinder gauge, and calculate the clearance. Differential pinion Factory specifi- 20.060 to 20.081 mm...

  • Page 252: Checking Backlash Between Spiral Bevel Pinion Gear And Bevel Gear

     SERVICING 4. TRANSAXLE 6. Servicing 5. If the backlash exceeds the factory specifications, 6.2.11 Checking backlash between spiral adjust the shims (3), (4). bevel pinion gear and bevel gear Backlash between Factory specifi- 0.10 to 0.30 mm spiral bevel pinion cation 0.0040 to 0.011 in. and bevel gear 6.2.12 Checking brake cam lever movement...

  • Page 253: Checking Height Of Cam Plate And Ball

     SERVICING 6. Servicing 4. TRANSAXLE 6.2.14 Checking height of cam plate and Factory specifi- 1.92 to 2.08 mm cation 0.0756 to 0.0818 in. ball Friction plate thick- ness 1.52 mm 1. Measure the height of the cam plate with the ball Allowable limit 0.0598 in.
  • Page 254  SERVICING 4. TRANSAXLE 6. Servicing 4-64 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 255: Front Axle

    FRONT AXLE KiSC issued 03, 2019 A...

  • Page 256: Mechanism

     MECHANISM 1. Structure of front axle 5. FRONT AXLE MECHANISM 1. Structure of front axle The front axle of the 4WD is constructed as shown below. Power is transmitted from the transmission through the propeller shaft to the bevel pinion shaft (9), then to the bevel gear (15) and to the differential side gear (13). The power through the differential side gear is transmitted to the differential yoke shaft (7), (12), and to the bevel gear shaft (16) through the bevel gears (4), (6) in the bevel gear case (5).

  • Page 257: Front Wheel Alignment

     MECHANISM 5. FRONT AXLE 2. Front wheel alignment 2. Front wheel alignment To assure smooth mobility or maneuverability and enhance stable and straight running, the front wheels are mounted at an angle to the right, left and forward directions. This arrangement is referred to as the Front Wheel Alignment.
  • Page 258  MECHANISM 2. Front wheel alignment 5. FRONT AXLE Front Rear BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 259  MECHANISM 5. FRONT AXLE 2. Front wheel alignment BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 260: Servicing

     SERVICING 1. Troubleshooting for front axle 5. FRONT AXLE SERVICING 1. Troubleshooting for front axle Refer- Probable cause and checking Symptom Solution ence procedure page Front wheels wander to right or 1. Tire pressure uneven Adjust 2-47 left 2. Improper toe-in adjustment Adjust (improper alignment) 3.

  • Page 261: Servicing Specifications For Front Axle

     SERVICING 5. FRONT AXLE 2. Servicing specifications for front axle 2. Servicing specifications for front axle Item Factory specification Allowable limit Front wheel alignment Toe-in 0 to 5 mm － 0 to 0.2 in. Front axle Rocking force 49.1 to 117 N －...

  • Page 262: Tightening Torques For Front Axle

     SERVICING 3. Tightening torques for front axle 5. FRONT AXLE 3. Tightening torques for front axle Tightening torques of screws, bolts and nuts on the table below are especially specified. Item N⋅m kgf⋅m lbf⋅ft Front wheel mounting screw 149 to 179 15.2 to 18.3 110 to 132 Tie-rod slotted nut 18 to 34...

  • Page 263: Checking And Adjusting

     SERVICING 5. FRONT AXLE 4. Checking and adjusting 4. Checking and adjusting 4.2 Adjusting front axle rocking force 4.1 Adjusting toe-in (1) Cotter pin (2) Adjusting nut 1. Jack up the front side of tractor and remove the front wheel. 2. Set a spring balance to the front gear case cover. 3.

  • Page 264: Adjusting Front Wheel Steering Angle

     SERVICING 4. Checking and adjusting 5. FRONT AXLE 4.3 Adjusting front wheel steering 5. Disassembling and angle assembling 5.1 Separating front axle assembly 5.1.1 Draining front axle case oil (1) Stopper bolt L.H. (2) Lock nut (Reference) 0.84 to 0.87 rad Right side (1) Breather plug (A) Oil level is acceptable within 48 to 50°...

  • Page 265: Removing Bonnet

     SERVICING 5. FRONT AXLE 5. Disassembling and assembling 1. Remove the under panel (1). (1) Under panel (1) Front link (4) L.H. bonnet bracket 2. Disconnect the negative cable (3) from the battery (2) Front link bracket (5) R.H. bonnet bracket (2). (3) Bonnet guide rod 3.

  • Page 266: Disconnecting Propeller Shaft

     SERVICING 5. Disassembling and assembling 5. FRONT AXLE 3. Remove the propeller shaft cover mounting bolt and slide the propeller shaft cover (1). (1) Hose clamp 2. Place the garage jack under the front axle. (1) Propeller shaft cover 3. Remove the cotter pin (3). 4.

  • Page 267: Front Axle Assembly

     SERVICING 5. FRONT AXLE 5. Disassembling and assembling 24 to 27 N⋅m Tightening tor- Power steering 2.4 to 2.8 kgf⋅m hose 18 to 20 lbf⋅ft 5.2 Front axle assembly 5.2.1 Removing power steering cylinder (1) Front gear case (3) Front axle case (2) Bevel gear case (When reassembling) •...

  • Page 268: Removing 36T Bevel Gear And Front Axle Shaft

     SERVICING 5. Disassembling and assembling 5. FRONT AXLE 1. Remove the front gear case mounting screws and remove the front gear case cover (1) with bevel gear (2). (1) Front gear case cover (6) Oil seal (2) Axle shaft (1) Front gear case cover 5.2.5 Removing front gear case and bevel gear case (When reassembling)

  • Page 269: Removing Bevel Pinion Shaft And Differential Gear Assembly

     SERVICING 5. FRONT AXLE 5. Disassembling and assembling 4. Remove the external circlip (7). 5.2.6 Removing bevel pinion shaft and 5. Remove the bevel gear case (5) from front gear differential gear assembly case (6). 6. Remove the oil seal (12) and the ball bearing (11). 7.

  • Page 270: Removing Differential Gear

     SERVICING 5. Disassembling and assembling 5. FRONT AXLE 1. Measure the differential side gear boss O.D. 5.2.7 Removing differential gear Differential side Factory specifi- 25.939 to 25.960 mm NOTE gear O.D. cation 1.0213 to 1.0220 in. • Arrange the parts to know their original position.

  • Page 271: Checking Backlash Between Differential Pinion And Differential Side Gear

     SERVICING 5. FRONT AXLE 6. Servicing 6.3 Checking backlash between 6.4 Checking turning torque of bevel differential pinion and differential pinion shaft side gear 1. Clamp the spiral bevel pinion shaft assembly to the vise and tighten the staking nut. 1. Set a dial gauge (lever type) on a tooth of the 2.

  • Page 272: Checking Backlash Between Bevel Pinion Shaft And Bevel Gear

     SERVICING 6. Servicing 5. FRONT AXLE 6.5 Checking backlash between (Reference) bevel pinion shaft and bevel gear 3.40 mm 0.134 in. 3.60 mm 0.142 in. 3.80 mm 0.150 in. 3.90 mm 0.154 in. 4.00 mm 0.157 in. Thickness of adjusting collars (3), (4) 4.10 mm 0.161 in.

  • Page 273: Checking Clearance Between Center Pin And Pin Support Bushing

     SERVICING 5. FRONT AXLE 6. Servicing 5. If backlash within factory specifications, adjust with shim (3). Backlash between 12T bevel gear Factory specifi- 0.1 to 0.3 mm and 15T bevel cation 0.004 to 0.01 in. gear (Reference) 0.8 mm 0.03 in. 1.0 mm 0.039 in.

  • Page 274: Steering

    STEERING KiSC issued 03, 2019 A...

  • Page 275: Mechanism

     MECHANISM 1. Structure of steering system 6. STEERING MECHANISM 1. Structure of steering system This model is provided with a full hydrostatic power steering. This steering system consists of a hydraulic pump (1), steering cylinder (2), steering controller (3), etc. In the full hydrostatic power steering, the steering controller (3) is connected to the steering cylinder (2) with only the hydraulic hoses.

  • Page 276: Hydraulic Circuit Of Steering

     MECHANISM 6. STEERING 2. Hydraulic circuit of steering 2. Hydraulic circuit of steering The steering circuit consists of a steering controller (1), steering cylinder (2), flow priority valve (3), hydraulic control valve assembly (4), hydraulic pump (5), and oil strainer (6). Oil is supplied from the oil strainer by the hydraulic pump to the flow priority valve. The flow priority valve then divides the oil into two directions.

  • Page 277: Steering Controller

     MECHANISM 3. Steering controller 6. STEERING 3. Steering controller 3.1 Structure of steering controller The steering controller consists of a control valve (4), metering device (3), and relief valve (1). (7) Spool (9) Sleeve (8) Centering spring Control valve 3.1.2 Metering device 3.1.2.1 Structure of metering device Oil sent from the hydraulic pump to the steering cylinder, passes through the metering device.

  • Page 278: Relief Valve

     MECHANISM 6. STEERING 3. Steering controller 3.1.3 Relief valve 3.1.3.1 Function of relief valve The relief valve is located in the steering controller. It controls the maximum pressure of the power steering system. 3.1.3.2 Specification of relief valve The setting pressure for the relief valve is as follows. 8.33 to 8.83 MPa Operating pres- Relief valve...

  • Page 279: Steering Cylinder

     MECHANISM 4. Steering cylinder 6. STEERING 4. Steering cylinder 4.1 Structure of steering cylinder (1) Rod (4) Guide (7) Center piston (10) Cylinder tube (2) Wiper seal (5) O-ring (8) Piston O-ring (11) Rod O-ring (3) Internal circlip (6) Seal ring (9) External circlip The steering cylinder is single piston both rod double-acting type.
  • Page 280  MECHANISM 6. STEERING 4. Steering cylinder BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 281: Servicing

     SERVICING 1. Troubleshooting for steering 6. STEERING SERVICING 1. Troubleshooting for steering Refer- Probable cause and checking Symptom Solution ence procedure page Cannot be steered 1. Steering controller malfunc- Replace 6-13 tioning Hard steering 1. Power steering oil improper Change with specified oil (Transmission fluid) 2.
  • Page 282  SERVICING 6. STEERING   Refer- Probable cause and checking Symptom Solution ence procedure page Noise 1. Air sucked in pump due to lack Fill 2-34 of oil 2. Air sucked in pump from suc- Repair － tion circuit 3. Pipe deformed Replace －...

  • Page 283: Servicing Specifications For Steering

     SERVICING 2. Servicing specifications for steering 6. STEERING 2. Servicing specifications for steering Power steering body Item Factory specification Allowable limit Relief valve Operating pressure 8.34 to 8.82 MPa － 85.0 to 90.0 kgf/cm 1210 to 1280 psi Steering cylinder Item Factory specification Allowable limit Steering cylinder I.D.
  • Page 284  SERVICING 6. STEERING 3. Tightening torques for steering 3. Tightening torques for steering Tightening torques of screws, bolts and nuts on the table below are especially specified. Item N⋅m kgf⋅m lbf⋅ft Steering wheel mounting nut 20 to 25 2.0 to 2.6 15 to 18 Power steering hose 24 to 27 2.4 to 2.8...

  • Page 285: Checking And Adjusting

     SERVICING 4. Checking and adjusting 6. STEERING 4. Checking and adjusting 5. Disassembling and assembling 4.1 Checking relief valve operating pressure 5.1 Power steering cylinder 5.1.1 Removing adapter and tie-rod NOTE • After setting a pressure gauge, be sure to bleed air. •...

  • Page 286: Disassembling Steering Cylinder

     SERVICING 6. STEERING 5. Disassembling and assembling (When reassembling) 5.1.2 Disassembling steering cylinder NOTE • Seals must be exchanged after disassembling. • Apply transmission fluid to the exchanged seals. • Enter the piston rod and block the guide assemblies with the circlips. 5.2 Separating power steering controller 5.2.1 Removing battery...

  • Page 287: Removing Steering Wheel

     SERVICING 5. Disassembling and assembling 6. STEERING 3. Disconnect the positive cable (4) from the battery (2) and remove the battery. (1) Hand accelerator lever grip (5) Combination switch (2) Battery (4) Positive cable (2) Main switch (6) Bolt (3) Negative cable (3) Cruise control lever knob (7) Upper panel (4) Tilt lever grip...

  • Page 288: Separating Power Steering Cylinder

     SERVICING 6. STEERING 5. Disassembling and assembling 2. Remove the steering controller mounting screws (9) and remove the steering controller. (1) Front link (4) L.H. bonnet bracket (2) Front link bracket (5) R.H. bonnet bracket (3) Bonnet guide rod (1) Steering controller (9) Screw 3.

  • Page 289: Removing Front Axle Assembly

     SERVICING 5. Disassembling and assembling 6. STEERING • Installing the cotter pin, be sure to split the cotter 5.3.2 Removing front axle assembly pin like an anchor. 1. Remove the power steering hose clamp (1). 24 to 27 N⋅m Tightening tor- Power steering 2.4 to 2.8 kgf⋅m hose 18 to 20 lbf⋅ft...

  • Page 290: Servicing

     SERVICING 6. STEERING 6. Servicing 6. Servicing 6.1 Checking steering cylinder I.D. 1. Measure the steering cylinder I.D. with a cylinder gauge. 2. If the cylinder I.D. exceeds the allowable limit, replace the cylinder barrel. Factory specifi- 40.000 to 40.062 mm cation 1.5748 to 1.5772 in.

  • Page 291: Hydraulic System

    HYDRAULIC SYSTEM KiSC issued 03, 2019 A...

  • Page 292: Mechanism

     MECHANISM 1. Structure of hydraulic system 7. HYDRAULIC SYSTEM MECHANISM 1. Structure of hydraulic system The hydraulic system of this tractor consists of hydrostatic transmission, hydraulic pump, 3 point hitch and power steering. (1) Power steering controller (3) Hydraulic block (5) Hydraulic pump (6) Hydrostatic transmission (2) Front loader control valve (4) Flow priority valve...

  • Page 293: Hydraulic Circuit

     MECHANISM 7. HYDRAULIC SYSTEM 2. Hydraulic circuit 2. Hydraulic circuit The hydraulic system of this tractor consists of a hydraulic pump, control valve for front loader, 3 point hitch system and other components. This system has the following functions: 1. Oil is supplied by hydraulic pump which is driven by pump drive shaft in the transmission case. As the pump drive shaft is connected to the propeller shaft, hydraulic pump starts operating when engine is started.
  • Page 294  MECHANISM   7. HYDRAULIC SYSTEM Operating pressure and oil flow (Factory specification) 23.5 L/min. (6.2 U.S.gals/min., 5.2 Imp.gals/min.) 0.55 to 0.75 MPa (5.6 to 7.7 kgf/cm , 80 to 100 psi) 20.1 to 21.1 MPa (205 to 215 kgf/cm , 2920 to 3060 psi) 1.0 to 1.3 MPa (11 to 13 kgf/cm , 150 to 180 psi) (12)

  • Page 295: Hydraulic Pump

     MECHANISM 7. HYDRAULIC SYSTEM 3. Hydraulic pump 3. Hydraulic pump 4. Control valve 3.1 Outline of hydraulic pump 4.1 Outline of control valve This hydraulic pump is located on left side of This position control valve is located under the transmission. hydraulic cylinder. Hydraulic pump is driven by the pump drive shaft in the This control valve is mechanically connected to the transmission case.

  • Page 296: Function Of Control Valve

     MECHANISM 4. Control valve 7. HYDRAULIC SYSTEM 4.2 Function of control valve 4.2.1 Control valve in neutral position When you stop the position control lever, the spool is stopped. The spool closes the oil flow from passage between P port and C port. Since the oil in the hydraulic cylinder is not drained to T2 port, neutral position is kept.

  • Page 297: Control Valve In Lift Position

     MECHANISM 7. HYDRAULIC SYSTEM 4. Control valve 4.2.2 Control valve in lift position When the control lever is set to the lift position, the spool (4) moves to the right. The oil forced into the control valve flows through P port to C port and the hydraulic cylinder. The oil pushes the hydraulic piston in the hydraulic cylinder to lift the implement.

  • Page 298: Control Valve In Down Position

     MECHANISM 4. Control valve 7. HYDRAULIC SYSTEM 4.2.3 Control valve in down position When the control lever is set to the down position, the spool (4) moves to the left. The oil forced from the P port flows through the gap between the control valve body and the spool to the T1 port. The oil in the hydraulic cylinder flows through the gap between the control valve body (3) and the spool (4) to the T2 port.

  • Page 299: Flow Priority Valve

     MECHANISM 7. HYDRAULIC SYSTEM 5. Flow priority valve 5. Flow priority valve 5.1 Outline of flow priority valve This flow priority valve is located to the left side of the transmission. The flow priority valve is a flow divider that divides a single hydraulic source (hydraulic pump) into two circuits and actuates them simultaneously.

  • Page 300: Structure Of Flow Priority Valve

     MECHANISM 5. Flow priority valve 7. HYDRAULIC SYSTEM 5.2 Structure of flow priority valve The structure of the flow priority valve is as follows. (1) Hydraulic pump gear (4) Flow priority valve EF: EF port (to 3 point hitch con- PF: PF port (to power steering, (2) Hydraulic pump case (5) Relief valve trol circuit)

  • Page 301: Specification Of Flow Priority Valve

     MECHANISM 7. HYDRAULIC SYSTEM 5. Flow priority valve 5.3 Specification of flow priority valve The oil flow of the priority valve is as follows. Power steering oil Engine speed Condition flow Above 8.0 L/min. At 1500 min (rpm) At no load 2.1 U.S.gals/min. 1.8 Imp.gals/min.

  • Page 302: Structure Of Relief Valve

     MECHANISM 6. Relief valve 7. HYDRAULIC SYSTEM 6.2 Structure of relief valve Among direct acting relief valves, this type is suited to higher pressure and has large capacity. Furthermore, this type is free from unstable operation, such as chattering, which occurs often in direct acting relief valves. As shown in the figure, the guide is attached to the poppet (7) and a valve chamber D.C.

  • Page 303: Function Of Relief Valve

     MECHANISM 7. HYDRAULIC SYSTEM 6. Relief valve 6.3 Function of relief valve When the oil pressure in the circuit is lower than the setting pressure of the relief valve, the relief valve is not operated and the oil fed to the relief valve from the hydraulic pump flows into the implement control valve. As the oil pressure in the circuit increases, so does the pressure in the damping chamber D.C.

  • Page 304: Specification Of Relief Valve

     MECHANISM 6. Relief valve 7. HYDRAULIC SYSTEM 6.4 Specification of relief valve The setting pressure of the relief valve is as follows. Relief valve set- Engine speed Oil temperature ting pressure 12.3 to 12.7 MPa 40 to 50 ℃ 125 to 130 kgf/cm Maximum 104 to 122 ℉...

  • Page 305: Hydraulic Cylinder

     MECHANISM 7. HYDRAULIC SYSTEM 7. Hydraulic cylinder 7. Hydraulic cylinder 7.1 Structure of hydraulic cylinder While the lift arm (1) is rising, oil from the hydraulic pump flows into the hydraulic cylinder through the hydraulic control valve (12) and cylinder port C. Then oil pushes out the piston (5). While the lift arm (1) is lowering, oil in the hydraulic cylinder is discharged to the transmission case through the hydraulic control valve by the weight of the implement.

  • Page 306: Hydraulic Block Type Outlet

     MECHANISM 8. Hydraulic block type outlet 7. HYDRAULIC SYSTEM 8. Hydraulic block type outlet 8.1 Structure of hydraulic block type outlet NOTE • This hydraulic block type outlet uses for front loader hydraulic system standard specification. The hydraulic block type outlet is located on the hydraulic cylinder assembly.

  • Page 307: Mower Linkage

     MECHANISM 7. HYDRAULIC SYSTEM 9. Mower linkage 9. Mower linkage 9.1 Structure of mower linkage The mower rear link (1) and the lift arm (5) are linked with the mower lift arm (2), the lift upper boss and the lift lower boss. As the hydraulic control lever moves to lift position, lift arm (5) is raised and the lift bracket (4) is pulled to pull the lift links to the rearward.

  • Page 308: Front Loader Valve

     MECHANISM 10. Front loader valve 7. HYDRAULIC SYSTEM 10. Front loader valve 10.1 Structure 10.1.1 Structure of front loader valve and pipe (1) Control lever (4) Pipe (Pressure) (7) Pipe (1A) for boom cylinder (10) Pipe (2A) for bucket cylinder (2) Lock lever (5) Pipe (Return) (8) Pipe (1B) for boom cylinder (11) Front loader control valve...

  • Page 309: Structure Of Front Loader Control Valve

     MECHANISM 7. HYDRAULIC SYSTEM 10. Front loader valve 10.1.2 Structure of front loader control valve The control valve assembly consists of one casting block and four major sections. (1) Boom control valve 1B: 1B port Pump port (2) Bucket control valve 2A: 2A port PB: Power beyond port 1A: 1A port 2B: 2B port...

  • Page 310: Front Loader Hydraulic Circuit

     MECHANISM 10. Front loader valve 7. HYDRAULIC SYSTEM 10.2 Front loader hydraulic circuit (1) Front loader control valve 1A: 1A port 2B: 2B port Tank port (2) Bucket control valve 1B: 1B port Pump port To hydraulic block (3) Boom control valve 2A: 2A port PB: Power beyond port 7-19...

  • Page 311: Function Of Loader Control Valve

     MECHANISM 7. HYDRAULIC SYSTEM 10. Front loader valve 10.3 Function of loader control valve 10.3.1 Loader control lever in neutral position When the loader control lever is set at neutral position, the hydraulic oil enters from P port (P), flows through the boom spool valve (3) and the bucket spool valve (2), and exits at PB port (PB).

  • Page 312: Loader Control Lever In Up Position

     MECHANISM 10. Front loader valve 7. HYDRAULIC SYSTEM 10.3.2 Loader control lever in up position 1. When the loader control lever is set at up position, the boom spool valve (3) moves outward. This creates an oil passage between the boom spool valve (3) and the front loader control valve (1). The pressured oil from the pump port (P) enters to this oil passage.
  • Page 313  MECHANISM 7. HYDRAULIC SYSTEM 10. Front loader valve (1) Front loader control valve (6) Check valve 1B: 1B port To tank, transmission case (2) Bucket spool valve (7) Boom cylinder 2A: 2A port Low pressure (3) Boom spool valve (8) Bucket cylinder 2B: 2B port High pressure (4) Detent plug (Bucket control)

  • Page 314: Loader Control Lever In Down Position

     MECHANISM 10. Front loader valve 7. HYDRAULIC SYSTEM 10.3.3 Loader control lever in down position 1. When the loader control lever is set at down position, the boom spool valve (3) moves inward. This creates an oil passage between the boom spool valve (3) and the front loader control valve (1). The pressured oil from the pump port (P) enters to the newly opened passage.
  • Page 315  MECHANISM 7. HYDRAULIC SYSTEM 10. Front loader valve Down (1) Front loader control valve (6) Check valve 1B: 1B port To tank, transmission case (2) Bucket spool valve (7) Boom cylinder 2A: 2A port Low pressure (3) Boom spool valve (8) Bucket cylinder 2B: 2B port High pressure (4) Detent plug (Bucket control)

  • Page 316: Loader Control Lever In Floating Position

     MECHANISM 10. Front loader valve 7. HYDRAULIC SYSTEM 10.3.4 Loader control lever in floating position 1. When the loader control lever is set to floating position, the boom spool valve (3) moves further inward. This creates oil passages at 1A port (1A) and 1B port (1B), as well as a passage between the boom spool valve (3) and the front loader control valve (1).
  • Page 317  MECHANISM 7. HYDRAULIC SYSTEM 10. Front loader valve Floating (1) Front loader control valve (6) Check valve 1B: 1B port To tank, transmission case (2) Bucket spool valve (7) Boom cylinder 2A: 2A port Low pressure (3) Boom spool valve (8) Bucket cylinder 2B: 2B port High pressure (4) Detent plug (Bucket control)

  • Page 318: Loader Control Lever In Roll-Back Position

     MECHANISM 10. Front loader valve 7. HYDRAULIC SYSTEM 10.3.5 Loader control lever in roll-back position 1. When the loader control lever is set at roll-back position, the bucket spool valve (2) moves outward. This creates oil passages at 2A port (2A) and 2B port (2B). 2.
  • Page 319  MECHANISM 7. HYDRAULIC SYSTEM 10. Front loader valve Roll-back (1) Front loader control valve (6) Check valve 1B: 1B port To tank, transmission case (2) Bucket spool valve (7) Boom cylinder 2A: 2A port Low pressure (3) Boom spool valve (8) Bucket cylinder 2B: 2B port High pressure (4) Detent plug (Bucket control)

  • Page 320: Loader Control Lever In Dump Position

     MECHANISM 10. Front loader valve 7. HYDRAULIC SYSTEM 10.3.6 Loader control lever in dump position 1. When the loader control lever is set to the dump position, the bucket spool valve (2) moves to the right. This creates an oil passage at 2A port (2A). The passage between 2B port (2B) and T port (T) is also opened. 2.
  • Page 321  MECHANISM 7. HYDRAULIC SYSTEM 10. Front loader valve Dump (1) Front loader control valve (6) Check valve 1B: 1B port To tank, transmission case (2) Bucket spool valve (7) Boom cylinder 2A: 2A port Low pressure (3) Boom spool valve (8) Bucket cylinder 2B: 2B port High pressure (4) Detent plug (Bucket control)

  • Page 322: Servicing

     SERVICING 1. Troubleshooting for hydraulic system 7. HYDRAULIC SYSTEM SERVICING 1. Troubleshooting for hydraulic system Refer- Probable cause and checking Symptom Solution ence procedure page Implement does not rise (no 1. Control valve broken Replace 7-44 noise) 2. Control valve improperly as- Repair 7-44 sembled...

  • Page 323: Servicing Specifications For Hydraulic System

     SERVICING 7. HYDRAULIC SYSTEM 2. Servicing specifications for hydraulic system 2. Servicing specifications for hydraulic system Item Factory specification Allowable limit Relief valve Setting pressure 12.3 to 12.7 MPa － (Condition) 125 to 130 kgf/cm • Engine speed: maximum 1780 to 1840 psi •...

  • Page 324: Tightening Torques For Hydraulic System

     SERVICING 3. Tightening torques for hydraulic system 7. HYDRAULIC SYSTEM 3. Tightening torques for hydraulic system Item N⋅m kgf⋅m lbf⋅ft ROPS mounting nut 124 to 147 12.6 to 15.0 91.2 to 108 Fuel tank stay mounting bolt and nut 48 to 55 4.9 to 5.7 36 to 41 Fender bracket mounting bolt...

  • Page 325: Checking And Adjusting

     SERVICING 7. HYDRAULIC SYSTEM 4. Checking and adjusting 4. Checking and adjusting 4.1 Relief valve 4.1.1 Checking relief valve setting pressure 1. Disconnect the hydraulic hose (1) from the right side of the transaxle. 2. Install the hydraulic hose (6) and adaptor A (3) with pressure gauge (2).

  • Page 326: Checking Power Steering Oil Flow

     SERVICING 4. Checking and adjusting 7. HYDRAULIC SYSTEM 2. Cap the power steering pipe (2) with plug (3). NOTE 3. Remove the hydraulic pipe behind the hydraulic Plug size: cylinder and fix the flow meter hose and the flow 9/16-18 UNF (meter) inlet as shown in the photo. SAE 37°...

  • Page 327: Mower Lift Linkage

     SERVICING 7. HYDRAULIC SYSTEM 4. Checking and adjusting 4.3 Mower lift linkage 4.3.1 Adjusting mower lift linkage • After reassembling the mower lift linkage, be sure to adjust it as follows. (1) Power steering controller (2) Power steering pipe hose (Inlet) Condition Engine speed Oil temperature 45 to 55 ℃...

  • Page 328: Disassembling And Assembling

     SERVICING 5. Disassembling and assembling 7. HYDRAULIC SYSTEM 4. Adjusting bolt (2) until the clearance between stopper and mower rear link L.H. Factory specifi- 0 to 0.5 mm Clearance "L2" cation 0 to 0.01 in. 5. Secure the lock nut (1). 5. Disassembling and assembling 5.1 Hydraulic pump 5.1.1 Removing battery...

  • Page 329: Removing Rops

     SERVICING 7. HYDRAULIC SYSTEM 5. Disassembling and assembling 5.1.3 Removing ROPS 1. Disconnect the R.H and L.H. hazard lamp/turn signals (3), (4) from the wire harness. 2. Remove the upper ROPS (1). (1) Upper cruise control rod (5) Forward HST pedal (2) R.H. side cover (6) Reverse HST pedal (3) Step mat (7) L.H.

  • Page 330: Removing Fuel Tank

     SERVICING 5. Disassembling and assembling 7. HYDRAULIC SYSTEM 4. Remove the differential lock pedal cover (4), cutting height adjusting dial knob (5), and lower speed adjusting knob (6). 5. Remove the R.H. lever grips (7). 6. Remove the R.H. lever guide (8) and R.H. handrail (10).

  • Page 331: Hydraulic Cylinder Block

     SERVICING 7. HYDRAULIC SYSTEM 5. Disassembling and assembling 2. Remove the lift arm L.H. (2). 7.9 to 9.3 N⋅m Hydraulic pump 0.80 to 0.95 kgf⋅m mounting bolt (M6) 5.8 to 6.8 lbf⋅ft Tightening tor- 18 to 20 N⋅m Hydraulic pump 1.8 to 2.1 kgf⋅m mounting bolt (M8) 13 to 15 lbf⋅ft 5.2 Hydraulic cylinder block...

  • Page 332: Removing Lift Rod And Lower Link

     SERVICING 5. Disassembling and assembling 7. HYDRAULIC SYSTEM 5.2.2 Removing lift rod and lower link 1. Remove the top link (2). 2. Remove the stopper pin (6) and remove the check chain plate (3). (1) Upper ROPS (5) L.H. lower ROPS (2) R.H. lower ROPS (6) Bolt (3) R.H.

  • Page 333: Removing Fender

     SERVICING 7. HYDRAULIC SYSTEM 5. Disassembling and assembling 2. Remove the R.H. and L.H. side covers (2), (7). 4. Remove the differential lock pedal cover (4), cutting height adjusting dial knob (5), and lower speed adjusting knob (6). 5. Remove the R.H. lever grips (7). 6.

  • Page 334: Removing Fender Center Stay

     SERVICING 5. Disassembling and assembling 7. HYDRAULIC SYSTEM 7. Remove the R.H. and L.H. fuel tank stays (9) and 5.2.9 Removing mower linkage and wire cushions (10), then remove the fuel tank (5). harness 1. Disconnect the mower linkage (2). 2. Remove the wire harness clamp and wire harness (1) from the hydraulic cylinder block.

  • Page 335: Hydraulic Cylinder And Control Valve

     SERVICING 7. HYDRAULIC SYSTEM 5. Disassembling and assembling 3. Remove the hydraulic cylinder block (2). (1) Control valve 2. Remove the internal circlip (4) and draw out the (2) Hydraulic cylinder block spool (2). (When reassembling) 5.3.2 Removing control valve lever Hydraulic cylinder 40 to 44 N⋅m Tightening tor- block mounting...

  • Page 336: Removing Lift Arm, Hydraulic Arm Shaft And Hydraulic Arm

     SERVICING 5. Disassembling and assembling 7. HYDRAULIC SYSTEM 5.3.3 Removing lift arm, hydraulic arm shaft and hydraulic arm (1) Hydraulic piston (When reassembling) • Be careful not to damage the O-ring (3) and back- (1) Hydraulic cylinder block (6) O-ring up ring (2). (2) Lift arm L.H.

  • Page 337: Mower Lift Linkage

     SERVICING 7. HYDRAULIC SYSTEM 5. Disassembling and assembling 5.4 Mower lift linkage 5.4.1 Disassembling mower linkage (1) Mower rear link, R.H. (4) Cutting height adjusting rod (8) Mower rear link, L.H. (2) Lift link rear, R.H. (5) Lift arm, L.H. (9) Adjusting cam (3) Cutting height adjusting dial (6) Link adjusting bolt knob...

  • Page 338: Control Valve (Front Loader)

     SERVICING 5. Disassembling and assembling 7. HYDRAULIC SYSTEM 5.5 Control valve (Front loader) 5.5.1 Removing battery WARNING To avoid serious injury or death: • When disconnecting battery cables, disconnect the negative cable from the battery first. • When connecting, connect the positive cable to the battery first.

  • Page 339: Removing Fender

     SERVICING 7. HYDRAULIC SYSTEM 5. Disassembling and assembling 2. Remove the R.H. and L.H. side covers (2), (7). 4. Remove the differential lock pedal cover (4), cutting height adjusting dial knob (5), and lower speed adjusting knob (6). 5. Remove the R.H. lever grips (7). 6.

  • Page 340: Disassembling Control Valve

     SERVICING 5. Disassembling and assembling 7. HYDRAULIC SYSTEM 5.5.7 Disassembling control valve (1) Bucket spool (8) Collar (15) Bucket bolt (22) Packing (2) Boom spool (9) Spring holder 1 (16) Spring holder 1 (23) Plug (3) Packing (10) Return spring (17) Return spring 2 (24) O-ring (4) Ball (11) Spring holder 2...

  • Page 341: Quick Coupler

     SERVICING 7. HYDRAULIC SYSTEM 5. Disassembling and assembling 5.6 Quick coupler 6. Servicing 5.6.1 Removing quick coupler (tractor side) 6.1 Hydraulic pump Tools required 6.1.1 Checking clearance between tip of • Cartridge socket gear tooth and casing 1. Disconnect the hydraulic pipes (1) from the 1.

  • Page 342: Checking Clearance Between Bushing And Shaft

     SERVICING 6. Servicing 7. HYDRAULIC SYSTEM 6.1.2 Checking clearance between bushing and shaft 1. Measure the gear shaft O.D. with an outside micrometer. 2. If the thickness is less than the allowable limit, replace it. Factory specifi- 2.48 to 2.50 mm cation 0.0977 to 0.0984 in.

  • Page 343: Checking Hydraulic Arm Shaft Bushing

     SERVICING 7. HYDRAULIC SYSTEM 6. Servicing 6.2.2 Checking hydraulic arm shaft bushing (A) Alloy thickness (L) Outside diameter 31.925 to 31.950 mm L.H. 1.2569 to 1.2578 in. Hydraulic arm Factory speci- shaft O.D. fication 29.925 to 29.950 mm R.H. 1.1782 to 1.1791 in. 1.

  • Page 344: Electrical System

    ELECTRICAL SYSTEM KiSC issued 03, 2019 A...

  • Page 345: Mechanism

     MECHANISM 1. Wiring diagram of BX tractor 8. ELECTRICAL SYSTEM MECHANISM 1. Wiring diagram of BX tractor BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 346: Electrical Connector Chart

     MECHANISM 8. ELECTRICAL SYSTEM 2. Electrical connector chart 2. Electrical connector chart BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 347: Reading Electrical Circuit Diagrams

     MECHANISM 3. Reading electrical circuit diagrams 8. ELECTRICAL SYSTEM 3. Reading electrical circuit diagrams 3.1 Electrical wiring chart symbols Electrical wiring chart symbols for harnesses and wires Item (Example) Contents of illustration Reference Name of part STARTER RELAY Wire specification code All use (common) Wire size 0.50 mm Wire color...
  • Page 348  MECHANISM 8. ELECTRICAL SYSTEM 3. Reading electrical circuit diagrams Color of wiring Color code Black Green Blue Pink White Yellow Brown Gray Light green Orange Sky blue BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...
  • Page 349  MECHANISM 3. Reading electrical circuit diagrams 8. ELECTRICAL SYSTEM Unit symbol (1) Variable (11) Heating element (22) Auto resetting b-Contact (33) On (2) Non-linear variable (12) Condenser (23) Auto resetting a-Contact (34) Start (Auto reset) (3) Fixed setting (13) Electrolytic capacitor (24) Relay coil (A) New symbol (4) Step variable (14) Magnetic core inductance...

  • Page 350: Layout Of Connector Diagrams

     MECHANISM 8. ELECTRICAL SYSTEM 3. Reading electrical circuit diagrams 3.2 Layout of connector diagrams Connector arrangement sequence Depiction of connectors NOTE • In principle, the connector locking part is shown on the top side. • Female connector terminal numbers start from 1 in the top right corner, looking at the connecting face. •...

  • Page 351: Precautions On Handling Electrical Connectors

     MECHANISM 3. Reading electrical circuit diagrams 8. ELECTRICAL SYSTEM 3.3 Precautions on handling electrical connectors 1. When disconnecting connectors, grasp the body of the connector and pull it out; do not pull on the wiring harness. If the connector is the locking type, release the lock and then pull to disconnect. 2.

  • Page 352: Starting System

     MECHANISM 8. ELECTRICAL SYSTEM 4. Starting system 4. Starting system 4.1 Electrical circuit of starting system When the main switch is turned to the GLOW position, the terminal BAT is connected to the terminal ON and AC. The glow plugs become red-hot, and the preheat indicator lamp also lights on while preheating. When the main switch is then turned to the START position with the safety switches on, the terminal BAT is connected to the terminals GLOW and ST.

  • Page 353: Function Of Relay

     MECHANISM 4. Starting system 8. ELECTRICAL SYSTEM 4.2 Function of relay 4.3 Function of starter (1) Front bracket (6) Gear shaft (2) Drive lever (7) Internal gear (3) Magnetic switch (8) Pinion gear (4) Pinion gear (9) Armature shaft (5) Overrunning clutch The reduction system is used planetary gears, and the speed of gear shaft (6) is reduced to approximately one-fifth of the armature shaft (9).

  • Page 354: Function Of Glow Plug

     MECHANISM 8. ELECTRICAL SYSTEM 4. Starting system 4.4 Function of glow plug HST pedal, PTO lever, independent PTO lever, and seat to engine stop solenoid. Safety switch Number of switch Type of switch name contact Seat switch Seat turnover switch PTO shift lever switch Normal open type Independent PTO...

  • Page 355: Operator Presence Control (Opc) System

     MECHANISM 5. Operator presence control (OPC) system 8. ELECTRICAL SYSTEM 5. Operator presence control (OPC) system 5.1 Electrical circuit of OPC timer General electrical circuit of the tractor OPC timer is shown in the figure. 1. When sitting on the operator's seat with the main switch is in the ON position, the battery voltage passes to the seat switch and OPC timer (4), and keep the solenoid relay (8).

  • Page 356: Charging System

     MECHANISM 8. ELECTRICAL SYSTEM 6. Charging system 6. Charging system 6.1 Electrical circuit for charging system 8-12 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 357: Function Of Ic Regulator (3P Connector Type)

     MECHANISM 6. Charging system 8. ELECTRICAL SYSTEM 6.2 Function of IC regulator (3P connector type) 3P connector is connected to the IC regulator. 3P connector consists of three leads, L (blue) lead (1), RY (red / yellow) lead (2), and WR (white / red) lead (3). L (blue) lead (1) is a lead to transmit the pulse from the alternator to hour meter and tachometer.

  • Page 358: Lighting System

     MECHANISM 8. ELECTRICAL SYSTEM 7. Lighting system 7. Lighting system 7.1 Electrical circuit for lighting system 8-14 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 359: Gauges

     MECHANISM 8. Gauges 8. ELECTRICAL SYSTEM 8. Gauges 8.1 Electrical circuit of gauge system 8-15 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 360: Meter Panel

     MECHANISM 8. ELECTRICAL SYSTEM 8. Gauges 8.2 Meter panel 8.2.1 Function of hour meter The meter panel on this machine is equipped with a digital hour meter. The hour meter indicates in five digits the operated hours when the main switch is turned to the ON position.

  • Page 361: Function Of Fuel Level Sensor

     MECHANISM 8. Gauges 8. ELECTRICAL SYSTEM The coolant temperature gauge detects the resistance contains a thermistor (4) whose electrical resistance from the coolant temperature sensor. decreases as the temperature increases. The coolant temperature gauge indicates the coolant Current varies with changes in the coolant temperature. temperature in the thermostat housing.

  • Page 362: Function Of Oil Pressure Switch

     MECHANISM 8. ELECTRICAL SYSTEM 8. Gauges 8.5 Function of oil pressure switch [A] At the proper oil pressure When the engine is started and as the proper oil pressure builds, the diaphragm (4) is pushed up. This separates the contact rivet (5) and breaks the circuit, causing the lamp to go out.

  • Page 363: Others

     MECHANISM 9. Others 8. ELECTRICAL SYSTEM 9. Others 9.1 Electrical circuit for accessory 8-19 BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 364: Function Of Dc Outlet

     MECHANISM 8. ELECTRICAL SYSTEM 9. Others 9.2 Function of DC outlet IMPORTANT • Do not use as cigarette lighter. • Do not use when wet. This machine is equipped with a DC outlet. It is located inside of the L.H. lever guide compartment. The capacity of the outlet is 12 V / 120 W.

  • Page 365: Servicing

     SERVICING 1. Troubleshooting for electrical system 8. ELECTRICAL SYSTEM SERVICING 1. Troubleshooting for electrical system Fuse and wiring Refer- Probable cause and checking Symptom Solution ence procedure page All electrical equipment do not 1. Battery discharged or dam- Recharge or replace 2-27 operate aged 2.
  • Page 366  SERVICING 8. ELECTRICAL SYSTEM   Starting system Refer- Probable cause and checking Symptom Solution ence procedure page Starter motor does not operate 1. Battery discharged or dam- Recharge or replace 2-27 aged 2. Slow blow fuse blown Replace 2-41 3. Safety switch improperly ad- Repair or replace 8-33 justed or damaged...
  • Page 367  SERVICING   8. ELECTRICAL SYSTEM Operator presence control (OPC) Refer- Probable cause and checking Symptom Solution ence procedure page Engine does not stop 1. Solenoid fuse blown (15 A) Replace 2-41 2. Engine stop solenoid relay Replace 8-37 damaged 3. Engine stop solenoid dam- Replace 8-37 aged...
  • Page 368  SERVICING 8. ELECTRICAL SYSTEM   Charging system Refer- Probable cause and checking Symptom Solution ence procedure page Charging lamp does not light 1. Fuse blown (15 A) Replace 2-41 when main switch is turned ON 2. Wiring harness disconnected Repair or replace or improperly connected (be- tween main switch AC terminal and panel board, between panel...
  • Page 369  SERVICING   8. ELECTRICAL SYSTEM Lighting system Refer- Probable cause and checking Symptom Solution ence procedure page Head light does not light 1. Fuse blown (15 A) Replace 2-41 2. Bulb blown Replace 2-42 3. Wiring harness disconnected Repair or replace or improperly connected (be- tween main switch AC terminal and head light switch, between...
  • Page 370  SERVICING 8. ELECTRICAL SYSTEM   Refer- Probable cause and checking Symptom Solution ence procedure page Turn signal light does not flicker 1. Flasher unit damaged Replace 8-42 2. Turn signal switch damaged Replace 8-38 Glow lamp does not light when 1. Battery discharged or dam- Recharge or replace 8-29 main switch is in PRE-HEAT po-...

  • Page 371: Service Specifications For Electrical System

     SERVICING 2. Service specifications for electrical system 8. ELECTRICAL SYSTEM 2. Service specifications for electrical system Factory specification (Service Item Allowable limit (Service limit) specification) Battery Voltage More than － 12 V Potential difference Less than － 0.1 V Glow plug Resistance Approx.

  • Page 372: Tightening Torques For Electrical System

     SERVICING 8. ELECTRICAL SYSTEM 3. Tightening torques for electrical system 3. Tightening torques for electrical system Item N⋅m kgf⋅m lbf⋅ft Starter B terminal nut 5.9 to 11.8 0.6 to 1.2 4.3 to 8.7 Pulley nut 58.4 to 78.9 5.95 to 80.5 43.1 to 58.2 RELATED PAGE TIGHTENING TORQUES on page 2-13 8-28...

  • Page 373: Checking And Adjusting

     SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM 4. Checking and adjusting 3. If measurement exceeds factory specification, clean the battery terminal posts and 4.1 Battery cable clamps, and tighten them firmly. 4.1.1 Checking battery voltage Potential differ- Factory specifi- Less than ence cation 0.1 V...

  • Page 374: Main Switch

     SERVICING 8. ELECTRICAL SYSTEM 4. Checking and adjusting 2. When the electrolyte temperature differs from that at which the hydrometer was calibrated, correct the specific gravity reading following the formula mentioned in (Reference). (Reference) • Specific gravity slightly varies with temperature. To be exact, the specific gravity decreases by 0.0007 with an increase of 1 ℃...

  • Page 375: Checking Main Switch Continuity At On Position

     SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM 2. Measure the resistance with an ohmmeter across 4.2.4 Checking main switch continuity at the B terminal and the ACC terminal, B terminal and preheat position ST terminal, B terminal and G terminal. 3. If infinity is not indicated, the contacts of the main switch are damaged.

  • Page 376: Starter

     SERVICING 8. ELECTRICAL SYSTEM 4. Checking and adjusting 2. Measure the resistance with an ohmmeter across 4.3.2 Testing starter magnet switch (pull-in, the B terminal and the G terminal, across the B holding coils) terminal and the ST terminal, and across the B terminal and the ACC terminal.

  • Page 377: Checking Glow Plug Continuity

     SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM 4.5 Safety switch 3. Turn the main switch key to the START position, and measure the voltage with a voltmeter between 4.5.1 Checking PTO shift lever switch the lead terminal and the chassis. continuity 4.

  • Page 378: Checking Hst Neutral Switch Continuity

     SERVICING 8. ELECTRICAL SYSTEM 4. Checking and adjusting 4. If the resistance values specified below are not indicated, the safety switch is damaged. Plunger is pushed into the switch body. 4 terminal (3) - 0 Ω 8 terminal (4) Resistance 5 terminal (5) - 0 Ω...
  • Page 379  SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM When switch is not pushed. / Resistance when operator Infinity leaves the seat. [A] Seat switch is not pushed. (When switch is pushed / when operator sits on the seat) 1. Measure the resistance between terminals (5). 2.

  • Page 380: Checking Opc Timer

     SERVICING 8. ELECTRICAL SYSTEM 4. Checking and adjusting across the battery negative terminal and the bulb 4.6.2 Checking OPC timer terminal. 4. Connect the jumper lead across the red terminal (4) and the bulb terminal. 5. If the bulb lights up when disconnecting the jumper lead from the red / white terminal (2), the OPC timer (1) is proper.

  • Page 381: Checking Fuel Pump Continuity

     SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM 4.9 Timer relay 4.7.2 Checking fuel pump continuity 4.9.1 Checking timer relay connector voltage 1. Disconnect the 2P connector from the fuel pump. (1) Timer relay 2. Check the continuity between the connector terminals with an ohmmeter. 1.

  • Page 382: Charging System

     SERVICING 8. ELECTRICAL SYSTEM 4. Checking and adjusting 1. Remove the timer relay (1). (1) Battery positive cord (1) Timer relay 4.11 Combination switch 2. Connect jumper leads across the battery positive 4.11.1 Removing combination switch terminal and the timer relay terminal 3, and across the battery positive terminal and the timer relay terminal 4.

  • Page 383: Checking Head Light Switch Continuity When Setting Switch At Off Position

     SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM 2. If the voltage differs from the battery voltage, the 4.11.4 Checking head light switch wiring harness and main switch is damaged. continuity when setting switch at ON position Main switch at 2 terminal - Battery volt- Voltage on position...

  • Page 384: Checking Turn Signal Light Switch Continuity When Setting Switch Knob At Off Position

     SERVICING 8. ELECTRICAL SYSTEM 4. Checking and adjusting 4.11.5 Checking turn signal light switch 4.11.6 Checking turn signal light switch continuity when setting switch knob at continuity when setting switch knob at OFF position RIGHT position (1) Green lead (A) Turn signal light switch OFF (1) Green lead (A) Turn signal light switch (2) Red / white lead...

  • Page 385: Checking Turn Signal Light Switch Continuity When Setting Switch Knob At Left Position

     SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM 4.11.7 Checking turn signal light switch 4.11.8 Checking hazard switch continuity continuity when setting switch knob at when setting switch knob at OFF position LEFT position (1) Black / blue lead (A) Hazard switch OFF position (2) Blue / white lead (1) Green lead (A) Turn signal light switch LEFT...

  • Page 386: Checking Hazard Switch Continuity When Setting Switch Knob At On Position

     SERVICING 8. ELECTRICAL SYSTEM 4. Checking and adjusting 4.11.9 Checking hazard switch continuity when setting switch knob at ON position (1) Flasher unit 3. Measure the voltage with a voltmeter across the connector terminal h and chassis. 4. If the voltage differs from the battery voltage, the (1) Black / blue lead (A) Hazard switch ON position (2) Blue / white lead...

  • Page 387: Testing Flasher Unit Actuation

     SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM 4.12 Gauge 4.11.11 Testing flasher unit actuation 4.12.1 Checking charge lamp (charging circuit) (1) Hazard lamp switch (3) Flasher unit (2) Turn signal light switch 1. Set the hazard switch to the ON position, and make sure the hazard lamp gives 60 to 85 flashes for a minute.

  • Page 388: Checking Engine Oil Pressure Lamp

     SERVICING 8. ELECTRICAL SYSTEM 4. Checking and adjusting 4.12.2 Checking engine oil pressure lamp (1) Engine oil pressure switch (2) Lead 1. Disconnect the lead (2) from the engine oil pressure switch (1). 2. Measure the resistance with an ohmmeter across the switch terminal and the chassis. 3.

  • Page 389: Checking Coolant Temperature Sensor Connector Voltage

     SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM 3. If the reference values are not indicated, the sensor 4.12.6 Checking coolant temperature is damaged. sensor continuity Float at up- per-most posi- 2.75 to 3.15 Ω Resistance tion (Full) (Sensor termi- Reference nal - Sensor value Float at lower- body)

  • Page 390: Checking Hour Meter And Tachometer

     SERVICING 8. ELECTRICAL SYSTEM 4. Checking and adjusting 3. If the measured voltages differ from the specified 4.12.7 Checking hour meter and voltage, the hour meter and tachometer are tachometer damaged. Voltage while en- Hour meter ter- gine operates at minal - Alterna- Approx.

  • Page 391: Meter Panel

     SERVICING 4. Checking and adjusting 8. ELECTRICAL SYSTEM 3. If infinity is not indicated, the outlet is damaged. Terminal name Terminal No. Color of wiring (Related item) DC outlet continui- 1 terminal - 2 Infinity R / B Glow plug terminal － －...

  • Page 392: Removing Magnet Switch

     SERVICING 8. ELECTRICAL SYSTEM 5. Disassembling and assembling 1. Disconnect the connecting lead (9) from the magnet 5.1.3 Removing plunger switch (8). 2. Remove the screws (6), and then separate the end frame (4), yoke (2) and armature (1). 3. Remove the two screws (5), and then remove the brush holder (3) from the end frame (4).

  • Page 393: Removing Rear End Cover

     SERVICING 5. Disassembling and assembling 8. ELECTRICAL SYSTEM 5.2.2 Removing rear end cover 1. Remove the three rear end cover screws and the B terminal nut, and remove the rear end cover. (1) IC regulator 5.2.5 Removing rectifier 1. Remove the four screws holding the rectifier and the stator lead wires.

  • Page 394: Removing Retainer Plate

     SERVICING 8. ELECTRICAL SYSTEM 5. Disassembling and assembling 5.2.7 Removing rotor IMPORTANT • Be careful not to drop the rotor and damage the slip ring or fan, etc. 1. Press out the rotor (1) from drive end frame (3). (1) Jig (3) Drive end frame (2) Block 5.2.10 Removing bearing at slip ring side 1.

  • Page 395: Checking Commutator And Mica

     SERVICING 6. Servicing 8. ELECTRICAL SYSTEM 1. Inspect the pinion for wear or damage. Less than Factory specifi- 2. If there is any problem, replace the overrunning 0.02 mm cation Difference of 0.0008 in. clutch assembly. O.D.'s 3. Check that the pinion turns freely and smoothly in 0.05 mm Allowable limit 0.0020 in.

  • Page 396: Checking Brush Holder

     SERVICING 8. ELECTRICAL SYSTEM 6. Servicing 3. If the length is less than the allowable limit, replace the yoke assembly and brush holder. Factory specifi- 14.0 mm cation 0.551 in. Brush length (A) 9.0 mm Allowable limit 0.354 in. 6.1.4 Checking brush holder 1.

  • Page 397: Alternator

     SERVICING 6. Servicing 8. ELECTRICAL SYSTEM 6.2 Alternator 6.2.3 Checking rotor 6.2.1 Checking bearing 1. Check the bearing for smooth rotation. 1. Measure the resistance across the slip rings. 2. If the resistance is zero or infinity, replace it. 2. If it does not rotate smoothly, replace it. Service specifi- Resistance 2.9 Ω...

  • Page 398: Checking Brush Wear

     SERVICING 8. ELECTRICAL SYSTEM 6. Servicing 6.2.5 Checking brush wear 1. Measure the brush length with vernier calipers. 2. If the measurement is less than allowable limit, replace it. Factory specifi- 10.5 mm cation 0.413 in. Brush length 8.4 mm Allowable limit 0.331 in.

  • Page 399: Mower

    MOWER KiSC issued 03, 2019 A...

  • Page 400: Mechanism

     MECHANISM 1. Structure of power transmission of mower 9. MOWER MECHANISM 1. Structure of power transmission of mower The power is transmitted from mid-PTO to blades as follows. Center blade Mid-PTO shaft (5) → Universal joint (4) → Pinion shaft (3) → Bevel gear (1) → Bevel gear (2) → Bevel gear shaft (8) →...

  • Page 401: Structure Of Lifting Mechanism Of Mower

     MECHANISM 9. MOWER 2. Structure of lifting mechanism of mower 2. Structure of lifting mechanism of mower CAUTION • Never operate mower in transport position. The lifting of mower is performed by the hydraulic system installed on the tractor. The mower should be kept lift when traveling. When the position control lever is moved to LIFT position, the lift arm (6) is lifted up by the oil pressure of hydraulic system, and the rear lift link (L.H.) (5) is pulled rearward.

  • Page 402: Structure Of Self-Balancer System Of Mower

     MECHANISM 3. Structure of self-balancer system of mower 9. MOWER 3. Structure of self-balancer system of mower This system reduces the stepped differences in cutting height when mowing rolling terrain. NOTE • Always keep the anti-scalp roller with specified position (Refer to Operator's Manual). Self-balancer 1.
  • Page 403  MECHANISM 9. MOWER   BX1880,BX2380,BX2680,RCK60B-23BX,RCK54-23BX,RCK48-18BX,RCK60D-26BX,RCK54D-26BX KiSC issued 03, 2019 A...

  • Page 404: Servicing

     SERVICING 1. Troubleshooting for mower 9. MOWER SERVICING 1. Troubleshooting for mower Refer- Probable cause and checking Symptom Solution ence procedure page Blade does not turn 1. Mid-PTO system malfunction- Check transmission 4-56 2. Mower belt broken Replace belt 9-19 Blade speed is slow 1.

  • Page 405: Servicing Specifications For Mower

     SERVICING 9. MOWER 2. Servicing specifications for mower 2. Servicing specifications for mower Item Factory specification Allowable limit Stopper and rear link Clearance 0 to 0.5 mm － 0 to 0.01 in. Front tip and rear tip of blade Difference 0.0 to 5.0 mm －...

  • Page 406: Tightening Torques For Mower

     SERVICING 3. Tightening torques for mower 9. MOWER 3. Tightening torques for mower Item N⋅m kgf⋅m lbf⋅ft Gear box mounting screw 78 to 90 7.9 to 9.2 58 to 66 Mower blade screw 103 to 117 10.5 to 12.0 76.0 to 86.7 Center pulley holder bolt and nut 78 to 90 7.9 to 9.2...

  • Page 407: Setting Up Mower [Rck48-18Bx, Rck54-23Bx, And Rck60B-23Bx]

     SERVICING 9. MOWER 4. Setting up mower [RCK48-18BX, RCK54-23BX, and RCK60B-23BX] 4. Setting up mower 2. Attach the discharge deflector to the deck with the spring, discharge pin and cotter pin. Secure the [RCK48-18BX, RCK54-23BX, spring to the discharge deflector as illustrated. and RCK60B-23BX] 4.2 Setting mower 4.1 Assembling mower...

  • Page 408: Installing Universal Joint

     SERVICING 4. Setting up mower [RCK48-18BX, RCK54-23BX, and RCK60B-23BX] 9. MOWER 4.3 Installing universal joint (1) Cutting height control dial (3) Rear link (2) Hydraulic control lever (4) L pin 1. Set the cutting height control dial (1) to zero inch position. 2.
  • Page 409  SERVICING 9. MOWER 4. Setting up mower [RCK48-18BX, RCK54-23BX, and RCK60B-23BX] 5. Setting up mower 2. Check length (L) and make sure it is set at the factory specification. [RCK54D-26BX and RCK60D-26BX] Length (L) from rear lock nut to Factory specifi- 47 mm from end of front cation 1.85 in.

  • Page 410: Setting Up Mower [Rck54D-26Bx And Rck60D-26Bx]

     SERVICING 5. Setting up mower [RCK54D-26BX and RCK60D-26BX] 9. MOWER 3. Attach the discharge deflector to the deck with the 3. Pull the L-pin (2) and extend the ramp (3) to front spring (9), discharge pin (10) and cotter pin (11). and rear sides. Secure the spring to the discharge deflector as illustrated.

  • Page 411: Mounting Frame Link

     SERVICING 9. MOWER 5. Setting up mower [RCK54D-26BX and RCK60D-26BX] 5.4 Mounting frame link 2. Attach the stay link (1) with the nut (2) on the tractor front frame. (1) Stay link (2) Nut 43.3 to 50.3 N⋅m Tightening tor- Stay link nut 4.4 to 5.1 kgf⋅m 32 to 37 lbf⋅ft 3.

  • Page 412: Setting Tractor

     SERVICING 5. Setting up mower [RCK54D-26BX and RCK60D-26BX] 9. MOWER 5.5 Setting tractor 5. Make sure that the frame link (1) is fully down. 1. Make sure that the frame link (1) is lifted up to the 5.6 Mounting mower TOP position when tractor is traveling without mower.

  • Page 413: Checking And Adjusting

     SERVICING 9. MOWER 6. Checking and adjusting 6. Set the PTO select lever to Rear-PTO position. 7. Connect the universal joint by the lever guide (3). (8) Anti-scalp roller 13. Adjust the anti-scalp roller (8). (3) Lever guide (A) Engage (4) Lock lever RELATED PAGE 6.1.6 Adjusting cutting height on page 9-18 8.

  • Page 414: Adjusting Front And Rear Cutting Height

     SERVICING 6. Checking and adjusting 9. MOWER 6.1.2 Adjusting front and rear cutting height RCK48-18BX, RCK54-23BX, and RCK60B-23BX IMPORTANT • Park the machine on a firm, flat and level surface and set the parking brake. • Before adjusting mower deck, make sure the tire pressure is correct.

  • Page 415: Adjusting Left And Right Cutting Height

     SERVICING 9. MOWER 6. Checking and adjusting 1. Turn the cutting height control dial (1) to 2.0 and adjust the anti-scalp roller's height to factory specified clearance between the rollers and the ground. Clearance be- Factory specifi- 6.0 to 13 mm tween rollers and cation 0.25 to 0.50 in.

  • Page 416: Adjusting Self-Balance Suspended Linkage

     SERVICING 6. Checking and adjusting 9. MOWER 1. Operate the hydraulic control lever (2) rearward to raise the mower deck to the highest position. 2. Stop the engine and remove the key. 3. Turn the cutting height control dial to the desired height.

  • Page 417: Adjusting Cutting Height

     SERVICING 9. MOWER 6. Checking and adjusting (1) Self-balancer (4) Plain washer (1) Cutting height control dial (2) Hydraulic control lever (2) Balancer spring (5) Mower deck (3) Lock nut (L) Balancer spring length 1. To set the cutting height, move the hydraulic control lever rearward to raise the mower to the highest 1.

  • Page 418: Checking Mower Blade And Belt

     SERVICING 6. Checking and adjusting 9. MOWER 3. Lower the mower deck by moving the hydraulic control lever (2) forward. 4. Use the higher settings for mowing in a rough area or when mowing tall grass. Lower settings should be used only for smooth lawns where short grass is desired.

  • Page 419: Disassembling And Assembling

     SERVICING 9. MOWER 7. Disassembling and assembling 2. Replace the mower belt with a new one, if there is found surface split at more than 3 positions. (When replacing mower belt) IMPORTANT • After setting the gear box bracket mounting screws on the deck without tightening, then mount the other screws on the gear box.

  • Page 420: Removing Blade Boss

     SERVICING 7. Disassembling and assembling 9. MOWER • Install the blade in position together with the dust cover and the cup washer(s). Tighten them up with the screw. 103 to 117 N⋅m Tightening tor- Mower blade 10.5 to 12.0 kgf⋅m screw 76.0 to 86.7 lbf⋅ft 7.4 Removing blade boss (a) Loosen 1.

  • Page 421: Disassembling Gear Box

     SERVICING 9. MOWER 7. Disassembling and assembling 2. Remove the mower belt (3) from the tension pulley 3. Remove the gear box cap (5). (5). 4. Remove the oil seal (10), internal circlip (11) and 3. Remove the left and right gear box mounting shim (12).

  • Page 422: Removing Outer Pulley And Blade Shaft

     SERVICING 7. Disassembling and assembling 9. MOWER 7.8 Removing outer pulley and blade (When reassembling) shaft NOTE • When reassembling the center pulley holder (14), gear box and gear box bracket (9), (10), tighten the bolts and nuts in the order as below, to prevent the incline the gear box.

  • Page 423: Removing Balancer

     SERVICING 9. MOWER 7. Disassembling and assembling 197 to 225 N⋅m Outer pulley 20.0 to 23.0 kgf⋅m mounting nut 145 to 166 lbf⋅ft Tightening tor- 24 to 27 N⋅m Pulley boss 2.4 to 2.8 kgf⋅m mounting nut 18 to 20 lbf⋅ft (RCK54-23BX, RCK60B-23BX, RCK54D-26BX, RCK60D-26BX) Outer pulley holder 78 to 90 N⋅m...

  • Page 424: Servicing

     SERVICING 8. Servicing 9. MOWER (When reassembling) 0.2 mm • Apply grease to the center pin (5). 0.0079 in. Thickness of adjusting shims • Adjust the balancer spring (3) length to the factory (1), (2) 0.3 mm specification, with lock nut (1). 0.0118 in.
  • Page 425  SERVICING 9. MOWER 8. Servicing 5. If the backlash exceeds the allowable limit, adjust it with shims (1), (4), (6). Factory specifi- 0.10 to 0.20 mm cation 0.0040 to 0.0078 in Backlash between bevel gears 0.40 mm Allowable limit 0.016 in. 0.2 mm 0.0079 in.
  • Page 426 INDEX Symbols bearing checking.............4-59,8-53 12T bevel gear and 15T bevel gear bearing at slip ring side checking backlash..........5-17 removing............8-50 36T bevel gear bearing case cover removing............5-13 removing............3-53 4WD detent ball bearing holder removing............4-47 checking flatness..........4-62 66T final gear bearing on drive end side removing............
  • Page 427 brush clutch piston checking wear..........8-51,8-54 checking flatness..........4-60 brush holder clutch spring checking.............8-52 checking free length...........4-60 removing............8-49 combination switch bushing and shaft checking connector voltage....... 8-38 checking clearance..........7-51 removing............8-38 bushing replacing tool commutator D1005-E4............2-58 checking.............8-51 D902-E4.............2-57 compression pressure BX tractor checking.............3-30 coolant..............
  • Page 428 cylinder layout diagram............. 8-6 checking wear............ 3-76 electrical part cylinder (oversize) handling precaution..........2-5 correcting............3-76 electrical system cylinder block service specifications......... 8-27 function..............3-1 tightening torques..........8-28 removing............ 4-45,4-46 troubleshooting..........8-21 cylinder block assembly electrical wiring checking.............4-58 checking and cleaning........2-22 cylinder head electrical wiring chart symbols........
  • Page 429 flow priority valve front wheel drive shaft outline..............7-8 assembling............4-56 specification............7-10 fuel................2-8 structure............... 7-9 fuel feed pump fluids correctly function.............. 3-12 discarding.............1-4 fuel filter flywheel checking.............2-29 function..............3-3 function.............. 3-12 removing............3-53 fuel filter element flywheel stopper............2-58 replacing............
  • Page 430 checking lead terminal voltage......8-32 hydraulic arm shaft function.............. 8-10 removing............7-45 removing............3-44 hydraulic arm shaft bushing governor gear checking.............7-52 removing............3-50 hydraulic block type outlet governor gear holder busing replacing tool....2-59 structure............. 7-15 grease................ 2-3 hydraulic circuit............7-2 greasing..............2-24 steering..............
  • Page 431 independent PTO lever switch meter function.............. 8-10 checking.............2-22 injection nozzle meter panel function.............. 3-12 checking connector voltage....... 8-47 injection pipe checking sensor resistance........8-47 removing............3-43 checking switch continuity........8-47 injection pump metering device checking.............2-38 function..............6-3 removing............3-49 structure............... 6-3 injection pump pressure tester.........2-55 mica injection timing checking.............8-51...
  • Page 432 mower lifting mechanism structure............... 9-2 panel mower link cleaning..............2-21 adjusting.............9-14 pedal mower linkage checking.............2-23 disassembling............ 7-46 pinion shaft removing............7-43 adjusting turning torque........9-25 structure............. 7-16 piston mower power transmission function..............3-2 structure............... 9-1 removing............ 3-51,4-46 mower self-balancer system piston pin structure...............
  • Page 433 checking.............4-58 rear end cover PTO clutch valve removing............8-49 removing............4-43 rear end frame PTO select arm removing............8-49 assembling............4-55 rear link PTO select lever mounting.............. 9-9 removing............4-43 rear PTO cover assembly PTO shift lever switch removing............4-51 checking continuity..........8-33 rear PTO switch function..............
  • Page 434 seat switch steering system checking continuity..........8-34 structure............... 6-1 function.............. 8-10 steering wheel seat turnover switch removing............6-13 checking continuity..........8-34 step function.............. 8-10 removing........4-38,7-38,7-41,7-47 self-balance suspended linkage stud bolts adjusting.............9-17 tightening torque..........2-13 separate plate swashplate checking wear............ 4-59 removing............4-46 serial number checking...............2-1 sharp edge..............
  • Page 435 transaxle case front cover valve stem and valve guide removing............4-48 checking clearance..........3-57 transmission fluid changing............2-34 checking level............ 2-20 walk around inspection..........2-19 draining.............. 4-36 water pump transmission oil............2-8 function...............3-11 transmission oil filter wheel tread.............. 2-47 replacing............ 2-24,2-33 wire harness transmission strainer removing............
  • Page 436 : Tractor and Agricultural Implement Service Dept. Address : 64, Ishizu-Kitamachi, Sakai-Ku, Sakai-City, Osaka, 590-0823, Japan Phone : +81-72-241-1129 : +81-72-245-2484 E-mail : kbt_g.ag-sv@kubota.com Editor : Harvester, Transplanter and Farm Machinery Products Service Dept. Address : 64, Ishizu-Kitamachi, Sakai-Ku, Sakai-City, Osaka, 590-0823, Japan Phone : +81-72-241-6554...

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