Kubota BX2370 Workshop Manual
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Kubota BX2370 Workshop Manual

Tractor,mower, front loader
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Table of Contents

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WORKSHOP MANUAL
TRACTOR,MOWER,
FRONT LOADER
BX1870,BX2370,BX2670,
RCK48-18BX,RCK54-23BX,
RCK60B-23BX,
RCK48P-18BX,RCK54P-23BX,
RCK54D-26BX,RCK60D-26BX,
LA203A,LA243A
KiSC issued 02, 2017 A

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Do you have a question about the BX2370 and is the answer not in the manual?

Questions and answers

Rene Bursey
March 18, 2025

Remove the drop down mower attatchment, now can't get the tractor in gear to drive?

0
1 comments:
Mr. Anderson
March 18, 2025

To get a Kubota BX2370 tractor in gear after removing the drop-down mower attachment, follow these steps:

1. Ensure Frame Link is Up: Lift the frame link to the "TOP" position, as it should be raised when the mower is not attached.
2. Check Rear Lock: Make sure the rear lock is unlocked.
3. Verify Universal Joint Position: Ensure the universal joint is in the rear position.
4. Set PTO Clutch Lever: The PTO clutch lever should be in the "OFF" position.
5. Engage 4WD (if needed): Start the engine and engage four-wheel drive if necessary.
6. Set Gear Range: Shift the range gear lever to "LOW" before moving.
7. Release Parking Brake: Disengage the parking brake before driving.

Once these steps are completed, the tractor should be ready to move and shift into gear properly.

This answer is automatically generated

0

Related Manuals for Kubota BX2370

Summary of Contents for Kubota BX2370

  • Page 1 WORKSHOP MANUAL TRACTOR,MOWER, FRONT LOADER BX1870,BX2370,BX2670, RCK48-18BX,RCK54-23BX, RCK60B-23BX, RCK48P-18BX,RCK54P-23BX, RCK54D-26BX,RCK60D-26BX, LA203A,LA243A KiSC issued 02, 2017 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 Issue Reference of the Main Revised Point and Corrective Measures {Search word} month Page Code No. 2013.08 Change to the Quick Hitch type at "[2] FRONT LOADER (1) Bucket, 8-S6 Boom and Hydraulic Cylinders".
  • Page 4 INFORMATION KiSC issued 02, 2017 A...

  • Page 5: Table Of Contents

    INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SAFETY DECALS .......................... I-4 [1] BX TRACTOR .......................... I-4 [2] MOWER ........................... I-8 [3] FRONT LOADER ........................I-12 3. SPECIFICATIONS........................I-14 [1] BX TRACTOR ........................I-14 [2] MOWER ..........................I-15 (1) RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX and RCK54P-23BX ..I-15 (2) RCK54D-26BX and RCK60D-26BX .................

  • Page 6: Safety First

    INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. SAFETY FIRST 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.
  • Page 7 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM OPERATE SAFELY • Do not use the machine after you consume alcohol or medication or when you are tired. • Put on applicable clothing and safety equipment. • Use applicable tools only. Do not use alternative tools or parts.
  • Page 8 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM KEEP A GOOD AIRFLOW IN THE WORK AREA • If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.

  • Page 9: Safety Decals

    INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. SAFETY DECALS The following safety decals are installed on the machine. If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list. WSM000001INI0013US0...
  • Page 10 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 9Y1210855INI0002US0 KiSC issued 02, 2017 A...
  • Page 11 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 9Y1210855INI0003US0 KiSC issued 02, 2017 A...
  • Page 12 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 9Y1210855INI0004US0 CARE OF DANGER, WARNING AND CAUTION LABELS 1. Keep danger, warning and caution labels clean and free from obstructing material. 2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.

  • Page 13: Mower

    INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] MOWER 9Y1210855INI0006US0 KiSC issued 02, 2017 A...
  • Page 14 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 9Y1210855INI0007US0 KiSC issued 02, 2017 A...
  • Page 15 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 9Y1210855INI0008US0 I-10 KiSC issued 02, 2017 A...
  • Page 16 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 9Y1210855INI0018US0 CARE OF DANGER, WARNING AND CAUTION LABELS 1. Keep danger, warning and caution labels clean and free from obstructing material. 2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.

  • Page 17: Front Loader

    INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] FRONT LOADER 9Y1210855INI0009US0 I-12 KiSC issued 02, 2017 A...
  • Page 18 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 9Y1210855INI0010US0 CARE OF DANGER, WARNING AND CAUTION LABELS 1. Keep danger, warning and caution labels clean and free from obstructing material. 2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.

  • Page 19: Specifications

    INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. SPECIFICATIONS [1] BX TRACTOR Model BX1870D BX2370D BX2670D PTO power 10.2 kW (13.7 HP)* 13.2 kW (17.7 HP)* 14.5 kW (19.5 HP)* Maker KUBOTA Model D722-E4-BX-1 D902-E4-BX-1 D1005-E4-BX-1 Type Indirect Injection, vertical, water-cooled, 4-cycle diesel Number of cylinders 67 ×...

  • Page 20: Mower

    SAE 1-3/8, 6 splines Rear Revolution 1 speed (540 min (rpm) at engine 3142 min (rpm)) PTO shaft USA No. 5 (KUBOTA 10-tooth) involute spline Revolution 1 speed (2500 min (rpm) at engine 3043 min (rpm)) NOTE • The company reserves the right to change the specifications without notice.

  • Page 21: Rck54D-26Bx And Rck60D-26Bx

    INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) RCK54D-26BX and RCK60D-26BX Model RCK60D-26BX RCK54D-26BX Suitable tractor BX2370, BX2670 Drive Over Quick-Joint, Parallel linkage Mounting method Drive over suspended linkage Adjustment of cutting height Dial gauge 1524 mm 1372 mm Cutting width (60 in.) (54 in.) Cutting height 25 to 102 mm (1.0 to 4.0 in.)

  • Page 22: Front Loader

    INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] FRONT LOADER Loader Specifications Loader Model LA203A LA243A BX2370D and BX2670D Tractor Model BX1870D (BX1860) (BX2360 and BX2660) Wheel Base (WB) 1340 mm (52.8 in.) 1400 mm (55.1 in.) Front Tires 16 × 7.5-8 18 × 8.5-10 Rear Tires 24 ×...
  • Page 23 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Dimensional Specifications Loader Model LA203A LA243A BX2370D and BX2670D Tractor Model BX1870D (BX1860) (BX2360 and BX2660) Maximum lift height (To bucket pivot pin) 1810 mm (71.3 in.) Maximum lift height under level bucket 1680 mm (66.1 in.) Clearance with bucket dumped 1350 mm (53.1 in.)
  • Page 24 INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (1) Height (mm) (3) At Pivot Pin (5) Rollback Force (kN) [A] LA203A (2) Lift Capacity (kg) (4) 500 mm Forward of Pivot Pin [B] LA243A 9Y1210855INI0015US0 I-19 KiSC issued 02, 2017 A...

  • Page 25: Traveling Speeds

    INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. TRAVELING SPEEDS (At rated engine rpm) Model BX1870D BX2370D and BX2670D Tire size (Rear) 24 × 12.00 – 12 26 × 12.00 – 12 Range gear shift lever km/h km/h 0 to 6.0 0 to 3.7 0 to 6.5...

  • Page 26: Dimensions

    INFORMATION BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 5. DIMENSIONS 9Y1210855INI0017US0 I-21 KiSC issued 02, 2017 A...
  • Page 27 GENERAL KiSC issued 02, 2017 A...
  • Page 28 GENERAL CONTENTS 1. IDENTIFICATION ......................... G-1 [1] TRACTOR IDENTIFICATION....................G-1 (1) Serial Number and Hour Meter..................G-1 (2) Cylinder Number....................... G-2 [2] MOWER IDENTIFICATION ....................G-2 [3] FRONT LOADER IDENTIFICATION ..................G-2 2. GENERAL PRECAUTIONS......................G-3 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ........G-4 [1] WIRING ..........................
  • Page 29 (12)Check Point of Every 1 Year ..................G-38 (13)Check Points of Every 4 Years..................G-39 (14)Others..........................G-40 [2] MOWER..........................G-42 (1) Check Points of Daily or Each Use................. G-42 (2) Check Point of Initial 50 Hours ..................G-46 (3) Check Point of Every 150 Hours..................G-46 (4) Check Point of Every 1 Year...................

  • Page 30: Identification

    BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. IDENTIFICATION [1] TRACTOR IDENTIFICATION (1) 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 [A] BX1870D (2) Tractor Serial Number...

  • Page 31: Cylinder Number

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (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. 9Y1210855GEG0002US0 [2] MOWER IDENTIFICATION When contacting your local KUBOTA distributor, always specify mower serial number.

  • Page 32: General Precautions

    • When it is necessary to use special tools, use KUBOTA special tools. Refer to the drawings when you make special tools that you do not use frequently.

  • Page 33: Handling Precautions For Electrical Parts And Wiring

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING To ensure safety and prevent damage to the machine and surrounding equipment, obey the following precautions in handling electrical parts and wiring. IMPORTANT • Check electrical wiring for damage and loosened connection every year.
  • Page 34 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM • Securely insert grommet. (1) Grommet (A) Correct (B) Incorrect WSM000001GEG0066US0 • Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp (Wind Clamp Spirally) (4) Welding Dent (2) Wire Harness WSM000001GEG0067US0 • Clamp wiring so that there is no twist, unnecessary sag, or excessive tension, except for movable part, where sag be required.

  • Page 35: Battery

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] BATTERY • Be careful not to confuse positive and negative terminal posts. • When you remove battery cables, disconnect negative cable first. When you install battery cables, check for polarity and connect positive cable first. • Do not install any battery with capacity other than is specified (Ah).

  • Page 36: Handling Of Circuit Tester

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM • Use sandpaper to remove rust from terminals. • Repair deformed terminal. Make sure that there is no terminal being exposed or displaced. (1) Exposed Terminal (3) Sandpaper (2) Deformed Terminal (4) Rust WSM000001GEG0075US0 • Make sure that there is no female connector being too open.

  • Page 37: Color Of Wiring

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [6] COLOR OF WIRING • Colors of wire are specified to the color codes. • This symbol of "/" shows color with stripe (s). (An example) Red stripe on white color: W/R Color of wiring Color code...

  • Page 38: Lubricants, Fuel And Coolant

    *: 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. Consult your local KUBOTA Dealer for further detail.

  • Page 39: Engine Oil, Fuel And Transmission Oil

    • No.2-D is a distillate fuel of lower volatility for engines in industrial and heavy mobile service. (SAE J313 JUN87) 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 40 We recommend the use of KUBOTA UDT or SUPER UDT fluid for optimum protection and performance. (Consult your local KUBOTA Distributor for further detail.) Do not mix different brands together.

  • Page 41: Mower

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] MOWER (1) Lubricants Place Capacity RCK60B-23BX RCK54-23BX Lubricant RCK54P-23BX Model RCK48-18BX RCK48P-18BX RCK54D-26BX RCK60D-26BX 0.36 L 0.15 L • SAE 90 gear oil Gear Box 0.38 U.S.qts 0.16 U.S.qts (API Service GL-5 gear oil) 0.32 Imp.qts 0.13 Imp.qts...

  • Page 42: Tightening Torques

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS (TRACTOR AND MOWER) Tighten screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual according to the table below. Indication on top of bolt...

  • Page 43: General Use Screws, Bolts And Nuts (Front Loader

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] GENERAL USE SCREWS, BOLTS AND NUTS (FRONT LOADER) Tighten screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual according to the table below. Indication on top of bolt No-grade or 4T 7T or Property class 8.8...

  • Page 44: Metric Screws, Bolts And Nuts

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [4] 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 4.9 to 5.7...

  • Page 45: Hydraulic Fittings

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [7] HYDRAULIC FITTINGS (1) Adaptors, Elbows and Others Tightening torque Item Shape Thread size N·m kgf·m lbf·ft 18.0 to 20.0 1.84 to 2.03 13.3 to 14.7 7/16 37.0 to 44.0 3.78 to 4.48 27.3 to 32.4 9/16...

  • Page 46: Maintenance Check List

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 6. MAINTENANCE CHECK LIST [1] BX TRACTOR Service Interval Refer- Item Since then ence important 100 150 200 250 300 350 400 450 page 1 Engine oil Change every 200 Hr G-21    2 Engine oil filter...

  • Page 47: Mower

    *7 When the battery is used for less than 100 hours per year, check the battery condition by reading the indicator annually. • The items listed above (@ marked) are registered as emission related critical parts by KUBOTA in the U.S.EPA nonroad emission regulation. As the engine owner, you are responsible for the performance of the required maintenance on the engine according to the above instruction.

  • Page 48: Front Loader

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] FRONT LOADER To keep the machine working in good condition as well as to avoid any accident and trouble, do the periodic inspection and maintenance. Check the following points before use. Service Interval Check Points Reference page...

  • Page 49: Check And Maintenance

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 7. CHECK AND MAINTENANCE [1] BX TRACTOR WARNING To avoid personal injury or death: Take the following precautions when checking the tractor. • Park the machine on firm and level ground. • Set the parking brake. • Lower the implement to the ground.

  • Page 50: Check Points Of Initial 50 Hours

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Check Points of Initial 50 Hours Changing Engine Oil CAUTION To avoid personal injury: • Be sure to stop the engine and remove the key before changing the oil. • Allow engine to cool down sufficiently, oil can be hot and can burn.
  • Page 51 Top off if necessary. 5. Properly dispose of used oil. IMPORTANT • To prevent serious damage to the hydraulic system, use only a KUBOTA genuine filter. (1) Transmission Oil Filter 9Y1210855GEG0018US0 G-22 KiSC issued 02, 2017 A...

  • Page 52: Check Points Of Every 50 Hours

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (3) Check Points of Every 50 Hours Checking Engine Start System WARNING To avoid personal injury or death: • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test do not operate the tractor.
  • Page 53 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking OPC System WARNING To avoid personal injury or death: • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test do not operate the tractor.  Preparation before testing.
  • Page 54 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking Wheel Mounting Screws Tightening Torque CAUTION • Never operate tractor with a loose rim, wheel, or axle. • Any time screws are loosened, retighten to specified torque. • Check all screws frequently and keep them tight.

  • Page 55: Check Points Of Every 100 Hours

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (4) Check Points of Every 100 Hours Checking Battery Condition DANGER To avoid the possibility of battery explosion: For the refillable type battery, follow the instructions below. • Do not use or charge the refillable type battery if the fluid level is below the LOWER (lower limit level) mark.
  • Page 56 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (Continued)  Battery Charging CAUTION • When the battery is being activated, hydrogen and oxygen gases in the battery are extremely explosive. Keep open sparks and flames away from the battery at all times, especially when charging the battery.
  • Page 57 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. (1) Element [A] BX1870D and BX2370 (2) Cover [B] BX2670D (3) Evacuator Valve...
  • Page 58 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking Fuel Line and Fuel Filter CAUTION • Stop the engine and remove the key before checking fuel lines and fuel filter. • Check the fuel lines periodically. The fuel lines are subject to wear and aging. Fuel may leak out onto the running engine, causing a fire.
  • Page 59 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Adjusting Brake Pedal Free Travel CAUTION • Stop the engine, remove the key, lower the implement to the ground, and chock the wheels before checking brake pedal. • Even if the brake pedal free travel is within the limitation, adjust the brake pedal following the procedure below.

  • Page 60: Check Points Of Every 200 Hours

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (5) Check Points of Every 200 hours Changing Engine Oil 1. See page G-21. 9Y1210855GEG0030US0 Replacing Transmission Oil Filter 1. See page G-22. 9Y1210855GEG0031US0 Replacing Engine Oil Filter 1. See page G-21. 9Y1210855GEG0032US0 Adjusting Toe-in 1. Park tractor on a firm, flat and level place.

  • Page 61: Check Points Of Every 400 Hours

    2. After draining reinstall the drain plug. 3. Clean the transmission strainer. 4. Fill with new KUBOTA SUPER UDT fluid up to the upper notch on the dipstick. 5. After running the engine for a few minutes, stop it and check the oil level again, add oil to prescribed level.
  • Page 62 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Changing Front Axle Case Oil 1. Park the machine on a firm, flat and level surface. 2. To drain the used oil, remove the right and left drain plugs and oil gauge at the front axle case and drain the oil completely into the oil pan.

  • Page 63: Check Point Of Every 800 Hours

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Replacing Fuel Filter Element 1. Disconnect the fuel hoses and replace the fuel filter (2). 2. Disconnect the fuel hoses and loosen the pipe clamp to replace the fuel filter (5). NOTE • If the fuel line is removed, be sure to properly bleed the fuel system.

  • Page 64: Check Point Of Every 2000 Hours Or 2 Years

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (10) Check Point of Every 2000 Hours or 2 Years Flush Cooling System and Changing Coolant WARNING To avoid personal injury or death: • Be sure to stop the engine and remove the key before checking coolant level.
  • Page 65 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (Continued)  Anti-Freeze WARNING To avoid personal injury or death: • When using antifreeze, put on some protection such as rubber gloves (Antifreeze contains position.). • If should drink antifreeze, throw up at once and take medical attention.

  • Page 66: Check Point Of Every 3000 Hours

    The LLC contains anticorrosive agent. If mixed with the cleaning agent, sludge may build up, adversely affecting the engine parts. 7. Kubota's genuine long-life coolant has a service life of 2 years. Be sure to change the coolant every 2 years. NOTE •...

  • Page 67: Check Point Of Every 1 Year

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (12) Check Point of Every 1 Year Checking Radiator Hoses and Hose Clamps CAUTION • Be sure to stop the engine and remove the key before checking radiator hose and clamp. Check to see if radiator hoses are properly secured every 200 hours of operation or six months, whichever comes first.

  • Page 68: Check Points Of Every 4 Years

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking Intake Air Line 1. Check to see that hose and hose clamps are tight and not damaged. 2. If hose and clamps are found to be worn or damaged, replace or repair them at once. (1) Hose...

  • Page 69: Others

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Replacing Fuel Line 1. Replace the hoses and clamps. Refer to "Checking Fuel Line and Fuel Filter". (See page G-29.) 9Y1210855GEG0048US0 Replacing Intake Air Line 1. Replace the intake hose. 2. Refer to "Checking Intake Air Line".
  • Page 70 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Replacing Fuse 1. The tractor electrical system is protected from potential damage by fuses. A blown fuse indicates that there is an overload or short somewhere in the electrical system. 2. If any of the fuses should blow, replace with a new one of the same capacity.

  • Page 71: Mower

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] MOWER (1) Check Points of Daily or Each Use WARNING To avoid serious injury: • Stop the engine, set the parking brake, and remove the key. • Remove the mower for daily checks. 9Y1210855GEG0094US0 Retightening Mower Blade Screw...
  • Page 72 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking Gear Box Oil Level 1. Place the mower on level ground. 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 73 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Greasing Spindle Shafts, Belt Tension Pivot and Tension Pulley 1. Grease the grease fittings (1), (2) of the spindle shafts if the amount of grease is insufficient. 2. [Only for RCK54D-26BX] Remove the ramp bracket (5) for greasing spindle 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 74 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Greasing Front and Rear Anti-scalp Rollers [RCK60B-23BX, RCK54P-23BX, RCK54-23BX, RCK54D-26BX RCK60D-26BX] 1. Grease the grease fitting (1), (2) of the front and rear anti-scalp rollers if the amount of grease is insufficient. IMPORTANT • Use the specified grease.

  • Page 75: Check Point Of Initial 50 Hours

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Check Point of Initial 50 Hours Changing Gear Box Oil CAUTION • Be sure to stop the engine and remove the key before changing the oil. 1. Dismount the mower from the tractor, and place the mower on level ground.

  • Page 76: Check Point Of Every 4 Years

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (5) Check Point of Every 4 Years Replacing Gear Box Oil Seal 1. Replace the gear box oil seals (1), (2) with new ones. (1) Oil Seal (2) Oil Seal 9Y1210855GEG0063US0 G-47 KiSC issued 02, 2017 A...

  • Page 77: Front Loader

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] FRONT LOADER CAUTION • When checking and repairing, park the tractor on flat ground and apply the parking brake. • When checking and repairing, lower the bucket and stop the engine. 9Y1210855GEG0064US0 (1) Check Points of Each Use or Daily Checking Transmission Fluid Level 1.

  • Page 78: Special Tools

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 8. SPECIAL TOOLS [1] SPECIAL TOOLS FOR ENGINE Special Use Puller Set Code No. • 07916-09032 Application • Use exclusively to pull out bearing, gears and other parts with ease. WSM000001GEG0011US0 Piston Ring Compressor Code No. • 07909-32111 Application •...
  • Page 79 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Diesel Engine Compression Tester (for Glow Plug) Code No. • 07909-39081 (Assembly) • 07909-31291 (K) • 07909-31301 (L) • 07909-31311 (M) Application • Use to measure diesel engine compression and diagnosis of need for major overhaul. (1) Gauge...
  • Page 80 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Connecting Rod Alignment Tool Code No. • 07909-31661 Application • Use to check the connecting rod alignment. Applicable range • Connecting rod big end I.D. 30 to 75 mm dia. (1.2 to 2.9 in. dia.) • Connecting rod length 65.0 to 300 mm (2.56 to 11.8 in.)
  • Page 81 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM NOTE • The following special tools are not provide, so make them referring to the figure. 9Y1210855GEG0069US0 Injection Pump Pressure Tester Application • Use to check fuel tightness of injection pumps. Pressure gauge fuel scale: More than 29.4 MPa (300 kgf/cm...
  • Page 82 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Valve Guide Replacing Tool Application • Use to press out and press fit the valve guide. BX1870D BX2370D BX2670D (D722-E4) (D902-E4) (D1005-E4) 220 mm (8.66 in.) 225 mm (8.86 in.) 80 mm (3.1 in.) 70 mm (2.8 in.) 40 mm (1.6 in.)
  • Page 83 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Bushing Replacing Tool [For BX1870D (D722-E4) and BX2370D (D902-E4)] Application • Use to press out and press fit the bushing. [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.
  • Page 84 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Busing Replacing Tool [For BX2670D (D1005-E4)] Application • Use to press out and press fit the valve guide. [For small end bushing] 157 mm (6.18 in.) 24 mm (0.94 in.) 120 mm (4.72 in.) 21.8 to 21.9 mm dia. (0.859 to 0.862 in. dia.) 24.8 to 24.9 mm dia.
  • Page 85 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Crankshaft Bearing 1 Replacing Tool Application • Use to press out and press fit the crankshaft bearing 1. [Press Out] BX1870D BX2370D BX2670D (D722-E4) (D902-E4) (D1005-E4) 135 mm (5.31 in.) 72 mm (2.8 in.) 40 mm radius (1.6 in. radius) 10 mm dia.
  • Page 86 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Governor Gear Holder Busing Replacing Tool [For BX2670D (D1005-E4)] Application • Use to press out and press fit the governor gear holder bushing. C1: 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.

  • Page 87: Special Tools For Tractor

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] SPECIAL TOOLS FOR TRACTOR Tie-rod End Lifter Code No. • 07909-39051 Application • Use to remove the tie-rod end with ease. WSM000001GEG0029US0 Relief Valve Pressure Tester Code No. • 07916-50045 Application • This allows easy measurement of relief set pressure.
  • Page 88 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Independent PTO Clutch Spring Compression Tool Application • Use for compressing the spring into the spline boss. This tool can be used for B30 series, BX50 series, BX60 series, BX24 and BX25 tractor. 12 mm (0.47 in.) 25.4 mm (1.00 in.)
  • Page 89 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Disassembling and Assembling Stand (1/2) Application • Use to disassembling transaxle assembly and to assembling transaxle assembly. ϕ9 mm (ϕ0.35 in.) 3 Holes 30.5 to 31.5 mm (1.21 to 1.24 in.) 225 mm (8.86 in.) 226 mm (8.90 in.) ϕ13 mm (ϕ0.51 in.) 3 Holes...
  • Page 90 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Disassembling and Assembling Stand (2/2) Application • Use to disassembling transaxle assembly and to assembling transaxle assembly. 311 mm (12.24 in.) 38.1 mm (1.50 in.) 40 mm (1.57 in.) 1.9 mm (0.07 in.) 38.1 mm (1.50 in.) 4.8 mm (0.19 in.)
  • Page 91 GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Check and High Pressure Relief Valve Assembly Tool Application • Use for readjusting relief valve pressure. 30 mm (1.181 in.) Chamfer 0.4 mm (0.157 in.) 1.05 rad (10 °) 21 mm (0.827 in.) Chamfer 3 mm (0.118 in.) Chamfer 0.3 mm (0.012 in.)

  • Page 92: Special Tools For Loader

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] SPECIAL TOOLS FOR LOADER Sliding Jig and Correcting Jig Application • Use to install the O-ring and the piston seal. Boom cylinder Bucket cylinder (40 mm (1.57 in.)) (65 mm (2.56 in.)) 80 √ 0.157 rad (9.0 °) 40.18 mm dia.

  • Page 93: Tires

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 9. TIRES [1] TIRE PRESSURE WARNING • Do not attempt to mount a tire on a rim. This should be done by a qualified person with the proper equipment. • Always maintain the correct tire pressure. Do not inflate tires above the recommended pressure shown in the operator's manual.

  • Page 94: Wheel Tread

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] WHEEL TREAD CAUTION To avoid personal injury: • Support tractor securely on stands before removing a wheel. • Never operate tractor with a loose rim, wheel or axle. 9Y1210855GEG0083US0 (1) Front Wheels Front tread can not be adjusted.

  • Page 95: Rear Wheels

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Rear Wheels Rear tread can not be adjusted. IMPORTANT • Do not turn discs to obtain wider tread. • Always attach tires as shown in the drawing. • If not attached as illustrated, transmission parts may be damaged.

  • Page 96: Ballast

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] BALLAST CAUTION • Additional ballast will be needed for transporting heavy implements. When the implements is raised, drive slowly over rough ground, regardless of how much ballast is used. • Do not fill the front wheels with liquid to maintain steering control.

  • Page 97: Rear Ballast

    GENERAL BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Rear Ballast Add weights to rear wheels if needed to improve traction or for stability. The amount of rear ballast should be matched to job and the ballast should be remove when it is not needed.

  • Page 98: Implement Limitations

    KUBOTA. Use with implements which are not sold or approved by KUBOTA and which exceed the maximum specifications listed below, or which are otherwise unfit for use with the KUBOTA Tractor may result in malfunctions or failures of the tractor, damage to other property and injury to the operator or others. [Any malfunctions or failures of the tractor resulting from use with improper implements are not covered by the warranty.]...
  • Page 99 • Implement size may very depending on soil operating conditions. *1 Reduce speed and trailer loads when operating in slippery conditions or when operating on slopes and utilize front wheel drive. *2 The valve contains the weight of KUBOTA standard bucket. 9Y1210855GEG0093US0 G-70...
  • Page 100 ENGINE KiSC issued 02, 2017 A...
  • Page 101 MECHANISM CONTENTS 1. LUBRICATING SYSTEM......................1-M1 2. COOLING SYSTEM ........................1-M2 3. FUEL SYSTEM........................... 1-M3 KiSC issued 02, 2017 A...
  • Page 102 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. LUBRICATING SYSTEM (1) Rocker Arm (2) Oil Pressure Switch (3) Rocker Arm Shaft (4) Valve (5) Idle Gear (6) Crankshaft (7) Oil Pump (8) Oil Strainer (9) Relief Valve (10) Push Rod (11) Tappet (12) Camshaft...
  • Page 103 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. COOLING SYSTEM (1) Radiator (2) Water Pump (3) Cooling Fan (4) Thermostat (5) Cylinder Head (6) Cylinder Head The cooling system consists of a radiator (1), a centrifugal water pump (2), a cooling fan (3) and a thermostat (4).
  • Page 104 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. FUEL SYSTEM (1) Injection Nozzle (2) Fuel Overflow Pipe (3) Fuel Tank (4) Fuel Filter (5) Fuel Feed Pump (6) Fuel Filter (7) Injection Pump (8) Injection Pipe Fuel from the fuel tank (3) passes through the fuel filter (4), and then enters the injection pump (7) after impurities such as dirt, water, etc.
  • Page 105 SERVICING CONTENTS 1. TROUBLESHOOTING.........................1-S1 2. SERVICING SPECIFICATIONS ....................1-S4 [1] BX1870D (D722-E4) and BX2370D (D902-E4)..............1-S4 [2] BX2670D (D1005-E4)......................1-S9 3. TIGHTENING TORQUES......................1-S15 4. CHECKING, DISASSEMBLING AND SERVICING ..............1-S17 [1] CHECKING AND ADJUSTING....................1-S17 (1) Engine Body ........................1-S17 (2) Lubricating System ......................1-S19 (3) Cooling System ......................1-S20 (4) Fuel System........................1-S22 [2] DISASSEMBLING AND ASSEMBLING ................1-S26 (1) Separating Engine ......................1-S26...

  • Page 106: Troubleshooting

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page No fuel Fill the fuel Engine Does Not Start Air in the fuel system Bleed G-40 Water in the fuel system Change fuel and – repair or replace fuel...
  • Page 107 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Reference Symptom Probable Cause Solution Page Overload Reduce the load – Either Black or Dark Gray Exhaust Gas Is Low grade fuel used Use specified fuel Observed Fuel filter clogged Replace G-34 Air cleaner clogged Clean or replace...
  • Page 108 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Reference Symptom Probable Cause Solution Page Different type of oil Use specified type of High Oil Pressure Relief valve damaged Replace 1-S19, 1-S68 Engine oil insufficient Fill 1-S26 Engine Overheated Fan belt broken or elongated Replace or adjust...

  • Page 109: Servicing Specifications

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. SERVICING SPECIFICATIONS [1] BX1870D (D722-E4) and BX2370D (D902-E4) ENGINE BODY Item Factory Specification Allowable Limit Valve Clearance (Cold) 0.145 to 0.185 mm – 0.00571 to 0.00728 in. Compression Pressure 2.85 to 3.23 MPa 2.26 MPa 29.0 to 33.0 kgf/cm 23.0 kgf/cm...
  • Page 110 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Item Factory Specification Allowable Limit Rocker Arm Shaft to Rocker Arm Clearance 0.016 to 0.045 mm 0.15 mm 0.00063 to 0.0017 in. 0.0059 in. • Rocker Arm Shaft O.D. 10.473 to 10.484 mm – 0.41233 to 0.41275 in.
  • Page 111 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Item Factory Specification Allowable Limit Camshaft Journal to Cylinder Block Bore Clearance 0.050 to 0.091 mm 0.15 mm 0.0020 to 0.0035 in. 0.0059 in. • Camshaft Journal O.D. 32.934 to 32.950 mm – 1.2967 to 1.2972 in.
  • Page 112 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Item Factory Specification Allowable Limit Crankshaft to Crankshaft Bearing 1 Oil Clearance 0.0340 to 0.106 mm 0.20 mm 0.00134 to 0.00417 in. 0.0079 in. [BX2370D (D902-E4)] • Crankshaft O.D. 43.934 to 43.950 mm – 1.7297 to 1.7303 in.
  • Page 113 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Item Factory Specification Allowable Limit Cylinder (Oversized) 67.250 to 67.269 mm 67.400 mm [BX1870D (D722-E4)] 2.6477 to 2.6483 in. 2.6535 in. 72.250 to 72.269 mm 72.400 mm [BX2370D (D902-E4)] 2.8445 to 2.8452 in. 2.8504 in. LUBRICATING SYSTEM...

  • Page 114: Bx2670D (D1005-E4)

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM FUEL SYSTEM Item Factory Specification Allowable Limit Injection Pump Injection Timing 0.3186 to 0.3447 rad – [BX1870D (D722-E4)] (18.25 to 19.75 °) before T.D.C Injection Timing 0.3360 to 0.3621 rad – [BX2370D (D902-E4)] (19.25 to 20.75 °) before T.D.C.
  • Page 115 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Item Factory Specification Allowable Limit Valve Face Angle (Intake) 1.0 rad – 60 ° Angle (Exhaust) 0.79 rad – 45 ° Valve Seat Angle (Intake) 1.0 rad – 60 ° Angle (Exhaust) 0.79 rad – 45 °...
  • Page 116 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Item Factory Specification Allowable Limit Idle Gear Shaft to Gear Bushing • Idle Gear 1 Clearance 0.020 to 0.054 mm 0.10 mm 0.00079 to 0.0021 in. 0.0039 in. • Idle Gear Bushing I.D. 26.000 to 26.021 mm –...
  • Page 117 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Item Factory Specification Allowable Limit Crankshaft Alignment – 0.02 mm 0.0008 in. Crankshaft to Crankshaft Bearing 1 Oil Clearance 0.0340 to 0.114 mm 0.20 mm 0.00134 to 0.00448 in. 0.0079 in. • Crankshaft O.D. 47.934 to 47.950 mm –...
  • Page 118 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM LUBRICATING SYSTEM Item Factory Specification Allowable Limit Engine Oil Pressure At Idle Speed More than – 49 kPa 0.50 kgf/cm 7.1 psi At Rated Speed 197 to 441 kPa 147 kPa 2.00 to 4.50 kgf/cm 1.50 kgf/cm 28.5 to 64.0 psi...
  • Page 119 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM FUEL SYSTEM Item Factory Specification Allowable Limit Injection Pump Injection Timing 0.3360 to 0.3621 rad – (19.25 to 20.75 °) before T.D.C. Pump Element Fuel Tightness – 13.73 MPa 140.0 kgf/cm 1991 psi Delivery Valve Fuel Tightness...

  • Page 120: Tightening Torques

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (Tractor section for general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-13.) Tractor Section Item N·m...
  • Page 121 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Dimension × Item N·m kgf·m lbf·ft Pitch Nozzle holder assembly M20 × 1.5 49 to 68 5.0 to 7.0 37 to 50 Nozzle holder – 35 to 39 3.5 to 4.0 26 to 28 Oil pressure switch...

  • Page 122: Checking, Disassembling And Servicing

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Engine Body Compression Pressure 1. Run the engine until it is warmed up. 2. Stop the engine. 3. Remove the air cleaner, the muffler and all glow plugs (or nozzles).
  • Page 123 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking Valve Clearance IMPORTANT • Valve clearance must be checked and adjusted when engine is cold. 1. Remove the cylinder head cover and the glow plugs. 2. Align the "1TC" mark at "1TC" and "Timing Line" (1) on the flywheel and alignment mark (2) on the rear end plate so that the No.

  • Page 124: Lubricating System

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Lubricating System Engine Oil Pressure 1. Remove the engine oil pressure switch, and set an oil pressure tester. 2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds. 3. If the oil pressure is less than the allowable limit, check the following.

  • Page 125: Cooling System

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (3) Cooling System Fan Belt Tension 1. Measure the deflection (A), depressing the belt halfway between the fan drive pulley and alternator pulley at specified force 98 N (10 kgf, 22 lbf). 2. If the measurement is not within the factory specifications, loosen the alternator mounting screws and relocate the alternator to adjust.
  • Page 126 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM CAUTION • When removing the radiator cap, wait at least ten minutes after the engine has stopped and cooled down. Otherwise, hot water may gush out, scalding nearby people. 9Y1210855ENS0011US0 Radiator Cap Air Leakage 1. Set a radiator tester (1) and an adaptor (2) on the radiator cap.

  • Page 127: Fuel System

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (4) Fuel System Injection Timing 1. Remove the injection pipes. 2. Remove the engine stop solenoid. 3. Turn the flywheel counterclockwise (viewed from flywheel side) until the fuel fills up to the hole of the delivery valve holder (3) for No.
  • Page 128 5. Set the speed control lever to the maximum speed position. 6. Run the starter to increase the pressure. 7. If the pressure can not reach the allowable limit, replace the pump with new one or repair with a Kubota-authorized pump service shop. 13.73 MPa...
  • Page 129 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM CAUTION • Check the nozzle injection pressure and condition after you make sure that there is nobody standing in the direction the fume goes. If the fume from the nozzle directly contacts the human body, cells may be destroyed and blood poisoning may be caused.
  • Page 130 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Nozzle Holder 1. Secure the nozzle retaining nut (7) with a vise. 2. Remove the nozzle holder (1), and remove parts inside. (When reassembling) • Assemble the nozzle in clean fuel oil. • Install the push rod (4), noting its direction.

  • Page 131: Disassembling And Assembling

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Separating Engine Draining Engine Oil 1. Start and warm up the engine for approx. 5 minutes. 2. Place an oil pan underneath the engine. 3. Remove the drain plug (1) to drain oil.
  • Page 132 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Bonnet and Under Cover 1. Open the bonnet (1), and then loosen the knob bolts (5) and pull forward to remove the under cover (2). 2. Disconnect the connectors (3) for head light and remove the bonnet bracket (4) with bonnet.
  • Page 133 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Separating Engine from Front Axle 1. Disconnect the ground cable. 2. Disconnect the front coupling (1). 3. Remove the engine mounting nuts (3). 4. Remove the engine support (4). 5. Hook the engine and separate the engine assembly with the radiator from the frame.

  • Page 134: Removing Outer Parts

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Removing Outer Parts Draining Coolant, Radiator, Air Cleaner and Muffler etc. CAUTION • Never open the radiator cap while operating or immediately after stopping. Otherwise, hot water will spout out from the radiator. Wait for more than ten minutes to cool the radiator, before opening the cap.
  • Page 135 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Injection Pipes 1. Loosen the screws to the pipe clamp (1). 2. Remove the injection pipes (2). (When reassembling) • Send compressed air into the pipes to blow out dust. Then, reassemble the pipes in the reverse order.
  • Page 136 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Rocker Arm and Push Rod 1. Remove the rocker arm bracket screw. [BX1870D (D722-E4) and BX2370D (D902-E4)] Remove the rocker arm bracket nut. [BX2670D (D1005-E4)] 2. Remove the rocker arm assembly (1). 3. Remove the push rods (2).
  • Page 137 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Tappets 1. Remove the tappets (1) from the crankcase. (When reassembling) • Visually check the contact between tappets and cams for proper rotation. If problem is found, replace tappets. • Before installing the tappets, apply engine oil thinly around them.

  • Page 138: Gear Case And Timing Gears

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (4) Gear Case and Timing Gears Oil Pan and Oil Strainer 1. Remove the oil pan mounting screws. 2. Remove the oil pan (2). 3. Remove the oil strainer (1). (When reassembling) • After cleaning the oil strainer, check to see that the filter mesh in clean, and install it.
  • Page 139 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Gear Case 1. Remove the fuel feed pump. 2. Remove the gear case. (When reassembling) • Grease thinly to the oil seal, and install it, ensuring the lip does not come off. (1) Gear Case Bolt Length = 45 mm (1.8 in.) Bolt Length = 50 mm (2.0 in.)
  • Page 140 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Injection Pump 1. Disconnect the start spring (4) on the thrust lever side (5). 2. Align the control rack pin (2) with the notch (1) on the crankcase, and remove the injection pump (3). 3. Remove the injection pump shims.
  • Page 141 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Cam Gear, Idle Gear 1, 2 and Governor Gear 1. Remove the idle gear 1 (4). 2. Remove the fuel camshaft stopper (7). 3. Draw out the fuel cam gear (1) with fuel camshaft (8). 4. Remove the camshaft stopper bolt.

  • Page 142: Piston And Connecting Rod

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (5) Piston and Connecting Rod Connecting Rod 1. Remove the connecting rod cap. (When reassembling) • Align the marks (a) with each other. (Face the marks toward the injection pump.) • Apply engine oil to the connecting rod screws and lightly screw it in by hand, then tighten it to the specified torque.
  • Page 143 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Piston Ring and Connecting Rod 1. Remove the piston rings using a piston ring tool. 2. Remove the piston pin (7), and separate the connecting rod (6) from the piston (5). (When reassembling) • Install the rings so that the manufacturer's mark (12) near the gap faces the top of the piston.

  • Page 144: Flywheel And Crankshaft

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (6) Flywheel and Crankshaft Flywheel 1. Secure the flywheel to keep it from turning, using a flywheel stopper. 2. Remove all flywheel screws (1) and then remove the flywheel (2). (When reassembling) • Align the "1TC" mark (a) on the outer surface of the flywheel horizontally with the alignment mark (b) on the rear end plate.
  • Page 145 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Crankshaft Assembly 1. Remove the main bearing case screw 2 (1). 2. Pull out the crankshaft assembly. IMPORTANT • Be careful to protect crankshaft bearing 1 from scratches, caused by the crank gear, etc.. (Wrap the gear in vinyl tape, etc..)

  • Page 146: Servicing

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] SERVICING (1) Cylinder Head and Valves Top Clearance 1. Remove the cylinder head. 2. With the piston at TDC, use grease to affix three or four plastigauges (1) of a diameter 1.5 mm (0.059 in.) × 5.0 to 7.0 mm (0.20 to 0.27 in.) long to the crown of the piston;...
  • Page 147 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Cylinder Head Flaw 1. Prepare an air spray red check. 2. Clean the surface of the cylinder head with detergent (2). 3. Spray the cylinder head surface with the red permeative liquid (1). Leave it five to ten minutes after spraying.
  • Page 148 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 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. 3. Measure the valve guide I.D. with a small hole gauge, and calculate the clearance.
  • Page 149 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Valve Seating 1. Coat the valve face lightly with prussian blue and put the valve on its seat to check the contact. 2. If the valve does not seat all the way around the valve seat or the valve contact is less than 70 %, correct the valve seating as follows.
  • Page 150 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Correcting Valve and Valve Seat NOTE • Before correcting the valve and seat, check the valve stem and the I.D. of valve guide section, and repair them if necessary. • After correcting the valve seat, be sure to check the valve recessing.
  • Page 151 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Free Length and Tilt of Valve Spring 1. Measure the free length (B) of valve spring with vernier calipers. If the measurement is less than the allowable limit, replace it. 2. Put the valve spring on a surface plate, place a square on the side of the valve spring.
  • Page 152 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Oil Clearance between Rocker Arm and Rocker Arm Shaft 1. Measure the rocker arm shaft O.D. with an outside micrometer. 2. Measure the rocker arm I.D. with an inside micrometer, and then calculate the oil clearance. 3. If the oil clearance exceeds the allowable limit, replace the rocker arm and measure the oil clearance again.
  • Page 153 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Oil Clearance between Tappet and Tappet Guide Bore 1. Measure the tappet O.D. with an outside micrometer. 2. Measure the I.D. of the tappet guide bore with a cylinder gauge, and calculate the oil clearance. 3. If the oil clearance exceeds the allowable limit or the tappet is damaged, replace the tappet.

  • Page 154: Timing Gears, Camshaft And Governor Gear

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Timing Gears, Camshaft and Governor Gear Timing Gear Backlash 1. Set a dial indicator (lever type) with its tip on the gear tooth. 2. Move the gear to measure the backlash, holding its mating gear. 3. If the backlash exceeds the allowable limit, check the oil clearance of the shafts and the gear.
  • Page 155 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Idle Gear 1 Side Clearance 1. Set a dial indicator with its tip on the idle gear. 2. Measure the side clearance by moving the idle gear to the front and rear. 3. If the measurement exceeds the allowable limit, replace the idle gear collar.
  • Page 156 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Cam Height 1. Measure the height of the cam at its highest point with an outside micrometer. 2. If the measurement is less than the allowable limit, replace the camshaft. [BX1870D (D722-E4) and BX2370D (D902-E4)] 26.88 mm Factory specification 1.058 in.
  • Page 157 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Oil Clearance between Idle Gear 1 Shaft and Idle Gear Bushing 1. Measure the idle gear shaft O.D. with an outside micrometer. 2. Measure the idle gear bushing I.D. with an inside micrometer, and calculate the oil clearance.

  • Page 158: Piston And Connecting Rod

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (3) Piston and Connecting Rod Piston Pin Bore I.D. 1. Measure the piston pin bore I.D. in both the horizontal and vertical directions with a cylinder gauge. 2. If the measurement exceeds the allowable limit, replace the piston.
  • Page 159 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Replacing Small End Bushing (When removing) 1. Press out the used bushing using a small end bushing replacing tool. (See page "SPECIAL TOOLS".) (When installing) 1. Clean a new small end bushing and bore, and apply engine oil to them.
  • Page 160 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Piston Ring Gap 1. Insert the piston ring into the lower part of the cylinder (the least worn out part) with a piston. 2. Measure the ring gap with a thickness gauge. 3. If the measurement exceeds the allowable limit, replace the piston ring.
  • Page 161 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Clearance between Piston ring and Piston Ring Groove 1. Clean the rings and the ring grooves, and install each ring in its groove. 2. Measure the clearance between the ring and the groove with a feeler gauge or depth gauge.

  • Page 162: Crankshaft

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (4) Crankshaft Crankshaft Side Clearance 1. Set a dial indicator with its tip on the end of the crankshaft. 2. Measure the side clearance by moving the crankshaft to the front and rear. 3. If the measurement exceeds the allowable limit, replace the thrust bearings.
  • Page 163 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Oil Clearance between Crankpin and Crankpin Bearing 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigauge on the center of the crankpin. 3. Install the connecting rod cap and tighten the connecting rod screws to the specified torque, and remove the cap again.
  • Page 164 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (Continued) [BX2670D (D1005-E4)] 0.029 to 0.091 mm Factory specification Oil clearance between 0.0011 to 0.0036 in. crankpin and crankpin 0.20 mm bearing Allowable limit 0.0079 in. 39.959 to 39.975 mm Crankpin O.D. Factory specification 1.5732 to 1.5738 in.
  • Page 165 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 1. Measure the O.D. of the crankshaft front journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate the oil clearance.
  • Page 166 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (Continued) [BX2670D (D1005-E4)] 0.0340 to 0.114 mm Factory specification Oil clearance between 0.00134 to 0.00448 in. crankshaft journal and 0.20 mm crankshaft bearing 1 Allowable limit 0.0079 in. 47.934 to 47.950 mm Crankshaft journal O.D. Factory specification 1.8872 to 1.8877 in.
  • Page 167 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 and Crankshaft Bearing 3 1. Put a strip of plastigauge on the center of the journal. 2. Install the bearing case and tighten the bearing case screws 1 to the specified torque, and remove the bearing case again.
  • Page 168 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (Continued) (Reference) • Undersize crankshaft bearing 2 and 3 (0.20 mm (0.0079 in.)) Models Bearing Code Number Marking Crankshaft bearing 2 02 15694-23930 BX1870D (D722-E4) Crankshaft bearing 3 02 15861-23860 020 US Crankshaft bearing 2 02 1G460-23930...
  • Page 169 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (Continued) [BX2670D (D1005-E4)] 0.034 to 0.095 mm Factory specification Oil clearance between 0.0014 to 0.0037 in. crankshaft journal and 0.20 mm crankshaft bearing 2 Allowable limit 0.0079 in. Crankshaft journal 47.934 to 47.950 mm Factory specification O.D. (Intermediate) 1.8872 to 1.8877 in.

  • Page 170: Cylinder

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (5) Cylinder Cylinder Wear 1. Measure the I.D. of the cylinder at the six positions (see figure) with a cylinder gauge to find the maximum and minimum I.D.'s. 2. Get the difference (Maximum wear) between the maximum and the minimum I.D.'s.

  • Page 171: Oil Pump

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (6) Oil Pump [A] BX1870D (D722-E4) and BX2370D (D902-E4) Rotor Lobe Clearance 1. Measure the clearance between lobes of the inner rotor and the outer rotor with a thickness gauge. 2. If the clearance exceeds the factory specifications, replace the oil pump rotor assembly.
  • Page 172 ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [B] BX2670D (D1005-E4) Rotor Lobe Clearance 1. Measure the clearance between lobes of the inner rotor and the outer rotor with a feeler gauge. 2. If the clearance exceeds the factory specifications, replace the oil pump rotor assembly.

  • Page 173: Relief Valve Spring

    ENGINE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (7) Relief Valve Spring Relief Valve 1. Remove the oil filter base. 2. Check the relief valve for dirt, and the seat and ball for damage. 3. If damaged, replace. 4. Check the free length of spring.
  • Page 174 TRANSAXLE KiSC issued 02, 2017 A...
  • Page 175 MECHANISM CONTENTS 1. STRUCTURE..........................2-M1 2. TRAVELING SYSTEM........................ 2-M2 [1] HYDROSTATIC TRANSMISSION ..................2-M2 (1) Structure ......................... 2-M2 (2) Oil Flow........................... 2-M3 (3) HST Control Linkage ...................... 2-M8 (4) Speed Set Linkage ......................2-M9 [2] RANGE GEAR SHIFT SECTION ..................2-M11 [3] FRONT WHEEL DRIVE SECTION ..................

  • Page 176: Structure

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. STRUCTURE (1) Hydrostatic Transmission (4) Front Wheel Drive Gear (6) PTO Gear Shift Section Front Side (2) PTO Clutch Section Section (7) Rear PTO Section Rear Side (3) Range Gear Shift Section (5) Mid-PTO Section (8) Differential Gear Section...

  • Page 177: Traveling System

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. TRAVELING SYSTEM [1] HYDROSTATIC TRANSMISSION (1) Structure (1) Check and High Pressure (6) Thrust Ball Bearing (12) Circlip (17) Needle Bearing Relief Valve (7) Swashplate (13) Thrust Ball Bearing (18) Ball Bearing (2) Trunnion Arm (8) Cradle Bearing...

  • Page 178: Oil Flow

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Oil Flow (1) Cylinder Block (Pump) (7) High Pressure Relief Port Plug (13) Power Steering Controller A Port (2) Swashplate (Forward) (14) Hydraulic Pump B Port (3) Piston (8) Charge Relief Valve (15) Flow Priority Valve...
  • Page 179 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Neutral (1) Cylinder Block (Pump) (7) High Pressure Relief Port Plug (13) Power Steering Controller A Port (2) Swashplate (Forward) (14) Hydraulic Pump B Port (3) Piston (8) Charge Relief Valve (15) Flow Priority Valve C Port...
  • Page 180 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Forward (1) Cylinder Block (Pump) (7) High Pressure Relief Port Plug (13) Power Steering Controller A Port (2) Swashplate (Forward) (14) Hydraulic Pump B Port (3) Piston (8) Charge Relief Valve (15) Flow Priority Valve C Port...
  • Page 181 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Reverse (1) Cylinder Block (Pump) (7) High Pressure Relief Port Plug (13) Power Steering Controller A Port (2) Swashplate (Forward) (14) Hydraulic Pump B Port (3) Piston (8) Charge Relief Valve (15) Flow Priority Valve C Port...
  • Page 182 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Relief (Reverse) (1) Cylinder Block (Pump) (7) High Pressure Relief Port Plug (13) Power Steering Controller A Port (2) Swashplate (Forward) (14) Hydraulic Pump B Port (3) Piston (8) Charge Relief Valve (15) Flow Priority Valve C Port...

  • Page 183: Hst Control Linkage

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (3) 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 and forward travelling speed increases.

  • Page 184: Speed Set Linkage

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (4) Speed Set Linkage Speed Set (1) Speed Set Rod (2) Speed Control Pedal (3) Cruise Lock (4) Cruise Lock (5) Cruise Plate (6) HST Pedal Link (7) Speed Change Rod (8) Damper (9) Trunnion Arm (10) Release Plate Speed Set Rod "OFF"...
  • Page 185 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM When the 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 186: Range Gear Shift Section

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] RANGE GEAR SHIFT SECTION Two kinds of power flow are selected by operating the range gear shift lever to shift the 16T-24T shifter gear (4) on the spiral bevel gear shaft (3).  Low Range 17T Gear Shaft (2) → Shifter Gear (24T) (4) → Spiral Bevel Pinion Shaft (3).

  • Page 187: Differential Gear Section

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [4] DIFFERENTIAL GEAR SECTION (1) Differential Gears (1) Differential Case (2) Differential Pinion (3) 37T Spiral Bevel Gear (4) 10T Final Gear Shaft (5) Differential Side Gear (6) Differential Pinion Shaft (7) 66T Final Gear (8) Differential Pinion (9) Differential Side Gear 1.

  • Page 188: Differential Lock

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Differential Lock (1) Rear Axle (2) Differential Lock Shifter (3) Differential Case (4) Differential Pinion (5) Rear Axle (6) Differential Lock Arm (7) Differential Lock Shaft (8) Differential Lock Shift Fork (9) Differential Side Gear (10) Differential Pinion Shaft...

  • Page 189: Brake Section

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [5] BRAKE SECTION (1) Rear Axle LH (2) Final Gear Shaft (3) Shim (4) Bearing Holder (5) Friction Plate (6) Actuator (7) Steel Ball (8) Cam Lever (9) O-ring (10) Rear Axle RH (11) Brake Disc (12) Internal Circlip...

  • Page 190: Pto System

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. PTO SYSTEM [1] PTO CLUTCH AND VALVE (1) PTO Select Gear (5) PTO Clutch Valve From HST Pump Shaft From Power Steering (2) PTO Clutch Pack (6) PTO Clutch Relief Valve To Mid-PTO Controller (3) Rear PTO Shaft...
  • Page 191 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM PTO Clutch Relief Valve 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 192 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM PTO Clutch "Disengaged" When the PTO clutch lever is set at the "Disengaged" position, the PTO clutch valve closes the oil passage to the PTO clutch pack. The oil in the PTO clutch pack drain into the transaxle case (10). Thus the clutch piston (4) is pushed back by the spring (7).

  • Page 193: Mid And Rear Pto Section

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] MID AND REAR PTO SECTION (1) HST Pump Shaft (4) Rear PTO Shaft (6) 24T Mid PTO Idle Gear (8) 28T PTO Select Gear (2) 12T Clutch Gear (5) 23T Mid PTO Gear (7) Mid-PTO Shaft...

  • Page 194: Others

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. OTHERS [1] HYDRAULIC PUMP DRIVE GEAR SECTION (1) HST Pump Shaft (2) Spline Boss (3) Idle Gear (4) Hydraulic Pump Drive Gear Shaft (5) Hydraulic Pump Drive Gear (6) Hydraulic Pump Drive Gear Shaft (7) Hydraulic Pump...
  • Page 195 SERVICING CONTENTS 1. TROUBLESHOOTING.........................2-S1 2. SERVICING SPECIFICATIONS ....................2-S5 3. TIGHTENING TORQUES......................2-S7 4. CHECKING, DISASSEMBLING AND SERVICING ..............2-S8 [1] CHECKING AND ADJUSTING....................2-S8 [2] PREPARATION ........................2-S16 (1) Separating Transaxle ....................2-S16 [3] DISASSEMBLING AND ASSEMBLING ................2-S23 (1) Hydrostatic Transmission ....................2-S23 (2) Hydraulic Cylinder ......................2-S29 (3) Transaxle Shafts......................2-S30 (4) Assembling Shafts......................2-S38 [4] SERVICING .........................2-S40...

  • Page 196: Troubleshooting

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. TROUBLESHOOTING HYDROSTATIC TRANSMISSION Reference Symptom Probable Cause Solution Page Oil level is low Check oil level or fill G-32 System Will Not oil to proper level Operate in Either Direction Speed control pedal linkage damaged Repair linkage...
  • Page 197 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Reference Symptom Probable Cause Solution Page Low transmission oil level Fill transmission oil G-32 Transmission Oil level up to proper Over Heats level Radiator net clogged Clean radiator net – Excessive machine load Reduce machine load –...
  • Page 198 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM TRAVELLING GEAR SHIFT SECTION Reference Symptom Probable Cause Solution Page Transmission oil insufficient Refill 2-S16 Noise from Transmission Gear worn or broken Replace – Bearings worn Replace – Gear Slip Out of Mesh Shift fork spring tension insufficient...
  • Page 199 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM PTO SECTION Reference Symptom Probable Cause Solution Page Operating pressure is low Check 2-S15 PTO Clutch Slip PTO clutch valve malfunctioning Repair or replace 2-S23 Clutch disc or drive plate excessively worn Replace 2-S37 Deformation of clutch piston...

  • Page 200: Servicing Specifications

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Charge Relief Valve Setting Pressure 0.55 to 0.75 MPa – [Oil temperature at 50 °C (122 °F)] 5.6 to 7.7 kgf/cm 80 to 100 psi High Pressure Relief Valve Setting Pressure 20.1 to 21.1 MPa...
  • Page 201 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Item Factory Specification Allowable Limit Brake Disc Thickness 3.30 to 3.50 mm 3.0 mm 0.130 to 0.137 in. 0.12 in. Friction Plate Thickness 1.92 to 2.08 mm 1.52 mm 0.0756 to 0.0818 in. 0.0598 in. 9Y1210855TXS0002US0 2-S6...

  • Page 202: Tightening Torques

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-13.) Item N·m kgf·m lbf·ft Charge relief valve checking plug (R 1/4) 30 to 44 3.0 to 4.5...

  • Page 203: Checking, Disassembling And Servicing

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Adjusting Maximum Speed 1. Lift up the rear wheels safely by the rigid jacks. 2. Shift the front wheel drive lever to "OFF" position. 3. Depress the speed control pedal to the forward all the way and lengthen the stopper bolt (for the forward) until it touches the speed control pedal.
  • Page 204 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Preparation before HST Adjustment CAUTION • Park the machine on a firm and level ground. 1. Place the wooden blocks at the front and the rear side of the wheels not to move the tractor. 2. Lift up the rear wheels (1) safely by the rigid jacks.
  • Page 205 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Adjustment of HST Neutral Position 1. Start the engine. 2. Keep the engine at the maximum revolution. 3. Shift the range shift lever (1) to "Hi" position (B). 4. Loosen the locking screw (5). NOTE • When adjusting the HST neutral position, loosen the locking screw approximately 2 turns counterclockwise not to drop the nut inside.
  • Page 206 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking and Adjusting HST Neutral Spring (for Dynamic Braking) WARNING • Do not operate if tractor move on level ground with foot off speed control pedal. • If tractor moves on level ground with foot off the pedal, or, if the pedal is too slow in returning to "Neutral"...
  • Page 207 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Charge Relief Pressure CAUTION • When checking, park the tractor on flat ground, and apply the parking brake. 1. Remove the plug (R 1/4) (1) from the front cover, then install the adaptor (R 1/4) and pressure gauge.
  • Page 208 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM High Relief Pressure (Reverse) CAUTION • When checking, park the tractor on flat ground, and apply the parking brake. 1. Remove the hexagon socket head plug (R 1/4) from P1 (1), then install the adaptor, cable and pressure gauge.
  • Page 209 Readjustment of Relief Valve (When the HST does not Work Due to its Loose Hexagon Socket Head Screw) IMPORTANT • KUBOTA does not recommend the readjustment of relief valve. KUBOTA recommends with genuine parts. • As the HST may be damaged if the pressure is set to high by mistake, be careful when adjusting it.
  • Page 210 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM PTO Clutch Operating Pressure CAUTION • When checking, park the tractor on flat ground, apply the parking brake. 1. Lift the rear of the tractor and remove the left rear wheel. 2. Remove the plug (R 1/8), then install the adaptor (R 1/8), cable and pressure gauge.

  • Page 211: Preparation

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] PREPARATION (1) Separating Transaxle 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 transmission case.
  • Page 212 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Lift Rod and Lower Link 1. Remove the top link (2). 2. Remove the stopper pin (6) and remove the check chain plate (3). 3. Move the bushes (8) to inside. 4. Move the shaft (9) to right side and remove the lower link as a unit.
  • Page 213 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Lever Grips and Fender 1. Remove the connector from the electric outlet (6). 2. Remove the lowering speed adjusting knob (5) and cutting height adjusting dial knob (4). 3. Remove the lever grips (3). 4. Remove the fender (1).
  • Page 214 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Fender Bracket, Hitch Plate 1. Remove the hitch plate (2). 2. Remove the parking brake return spring (4) and the fender brackets (1), (3). (When reassembling) • Do not firmly tighten all screws, bolts and nuts until most components are attached.
  • Page 215 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Transaxle Assembly 1. Remove the differential lock rod (1) and disconnect the mower link (2). 2. Remove the brake rod (4). 3. Disconnect the pipes (3). (If equipped.) 4. Disconnect the connector (5). 5. Remove the rear coupling mounting bolt (8).
  • Page 216 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Brake Pedal 1. Unhook the spring (2) and remove the parking lock (1). 2. Removing the split pin then remove pin (5) from the brake arm (4). 3. Remove the brake pedal (6). (1) Parking Lock (4) Brake Arm...
  • Page 217 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Differential Lock Pedal 1. Remove the differential lock return spring (1). 2. Remove the rue ring cotter (3). 3. Turn and remove the differential lock pedal (2). (1) Spring (3) Rue Ring Cotter (2) Differential Lock Pedal...

  • Page 218: Disassembling And Assembling

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] DISASSEMBLING AND ASSEMBLING (1) Hydrostatic Transmission Levers and Mower Lift Arm 1. Tap out the spring pin from the range gear shift lever (1) and front wheel drive lever (3), then remove the both levers. 2. Remove the hydraulic control lever (2).
  • Page 219 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Oil Cooler Cover 1. Remove the HST front cover. 2. Remove the HST front cover (1) not to damage the oil seal (5). 3. Remove the center section (6). (When reassembling) 1. Do not damage the oil seal (5).
  • Page 220 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Check and High Pressure Relief Valve 1. After removing the plug (1), draw out the spring (3) and the check and high pressure relief valve assembly (4), (5). (When reassembling) • Be careful not to damage the O-ring (2) on the plug (1).
  • Page 221 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Cylinder Block and Piston 1. Remove the piston (3) and the spring (2) from the cylinder block (1). (When reassembling) • Apply clean transmission oil to the cylinder block and the piston. NOTE • Be careful not to damage the surface of the cylinder block and the piston.
  • Page 222 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Swashplate and Trust Roller Bearing 1. Remove the circlip (6) from the pump shaft (3) and the motor shaft (1). 2. Remove the thrust bearing (2). 3. Remove the swashplate (5) and the thrust roller bearing (4).
  • Page 223 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4WD Detent Ball 1. Remove the 4WD detent bolt (1), the detent spring (2) and the detent ball (3) before removing the transaxle front case, not to drop the detent ball (3) into the transaxle case. (1) 4WD Detent Bolt...

  • Page 224: Hydraulic Cylinder

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Hydraulic Cylinder Hydraulic Cylinder 1. Disconnect the delivery pipe (1). 2. Remove the hydraulic cylinder mounting bolts (3). 3. Remove the hydraulic cylinder (2). (When reassembling) • Apply liquid gasket (Three Bond 1208D or equivalent) to the joint surface of the transaxle case to the hydraulic cylinder.

  • Page 225: Transaxle Shafts

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (3) Transaxle Shafts Transaxle Case Front Cover NOTE • Before removing the transaxle case front cover (4), remove the 4WD detent bolt (1), the detent spring (2) and the detent ball (3) from the transaxle case front cover (4).
  • Page 226 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Hydraulic Pump Assembly 1. Remove the hydraulic pump assembly mounting bolt (2), (3). 2. Remove the hydraulic pump assembly (1) as an unit from the transaxle case. (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 227 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Rear PTO Cover Assembly 1. Remove the rear PTO cover mounting bolts (1). 2. Remove the rear PTO cover (2). 3. Remove the rear PTO shaft (5) from the rear PTO cover (2). (When reassembling) • Pull the 11T PTO select shaft with the bearing approximately the bearing thickness.
  • Page 228 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Rear Axle (LH) NOTE • Prepare a specially bent snap ring pillar. 1. Draw out the oil seal with a screw driver. 2. Remove the internal circlip from the rear axle case. 3. Draw out the rear axle from the rear axle case.
  • Page 229 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Rear Axle Case (RH) 1. Remove the rear axle case (RH) mounting bolts. 2. Remove the rear axle case (RH) (1) as an assembly from the transaxle case. NOTE • Since the adjusting shims are installed behind the 37T spiral bevel gear, check the shims.
  • Page 230 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 66T Final Gear 1. Remove the bearing (2) with a puller. 2. Remove the bearing (4) with a puller. 3. Remove the differential lock shifter (5) and 66T final gear (6). 4. Put parting marks on the differential pinions (12), (16) and the differential side gears (9), (14).
  • Page 231 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Rear Axle Case, RH and Brake 1. Remove the internal circlip (1). 2. Remove the shim (9), the bearing holder (8) and the other brake parts from the brake case. (When reassembling) • Apply grease to the steel balls.
  • Page 232 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM PTO Clutch Assembly 1. Remove the bearing (2). 2. Remove the external circlip and the clutch gear (3). 3. Remove the seal rings (6). 4. Remove the bearing (5). 5. Remove the external circlip (18) using a clutch spring compressor.

  • Page 233: Assembling Shafts

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (4) Assembling Shafts Assembling Select Arms and HST Pump Shaft (PTO Clutch Shaft) 1. Install the PTO select arm (1). 2. Install the range shift arm (2) and the front wheel drive shift arm (3). 3. Install the idle gear shaft.
  • Page 234 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Front Wheel Drive Shaft, Shifter, Spiral Bevel Pinion Shaft and Mid-PTO Shaft 1. Install the front drive shaft (1). 2. Install the shifter (2) and the spiral bevel pinion shaft (3) together. 3. Install the mid-PTO idle gear shaft (5) and the mid-PTO shaft (6) and the HST motor shaft (4) together.

  • Page 235: Servicing

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [4] SERVICING (1) Hydrostatic Transmission Center Section 1. Check the center section surface (1) for scratches or wear. 2. If deep scratch or excessive wear is found, replace the hydrostatic transmission assembly. (1) Center Section Surface 9Y1210855TXS0052US0 Charge Relief Valve 1.
  • Page 236 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Thrust Washer, Thrust Roller Bearing, Thrust Plate and Cradle Bearing 1. Check the thrust bearing (3) for scratches and excessive wear. 2. If it is worn, replace it. 3. Check the thrust plate (4) for scratches and excessive wear. If it is worn or scored, replace it.

  • Page 237: Transaxle Case

    TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Transaxle Case Bearing 1. Hold the inner race, and push and pull the outer race in all directions to check wear and roughness. 2. Apply the transmission oil to the bearing, and hold the inner race.
  • Page 238 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Clutch Spring Free Length 1. Measure the free length of spring with vernier calipers. 2. If the measurement is less than the allowable limit, replace it. 38.5 mm Factory specification 1.52 in. Clutch spring free length 34.5 mm Allowable limit 1.36 in.
  • Page 239 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Clearance between Differential Pinion Shaft and Differential Pinion 1. Measure the differential pinion shaft O.D. with an outside micrometer. 2. Measure the differential pinion I.D. with a cylinder gauge, and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace faulty parts.
  • Page 240 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Backlash between Spiral Bevel Pinion Gear and Bevel Gear 1. Temporarily assemble the spiral bevel pinion gear (2) and the bevel gear (1) in the transaxle case. 2. Hold the wire of solder or plastigauge on the bevel gear teeth upper surface (A).
  • Page 241 TRANSAXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Height of Cam Plate and Ball 1. Measure the height of the cam plate with the ball installed. 2. If the measurement is less than the allowable limit, replace the cam plate and balls. 3. Inspect the ball holes of cam plate for uneven wear.
  • Page 242 FRONT AXLE KiSC issued 02, 2017 A...
  • Page 243 MECHANISM CONTENTS 1. STRUCTURE..........................3-M1 2. FRONT WHEEL ALIGNMENT....................3-M2 KiSC issued 02, 2017 A...
  • Page 244 FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. STRUCTURE (1) Axle (6) Bevel Gear (11) Differential Pinion Shaft (16) Bevel Gear Shaft (2) Axle Flange (7) Differential Yoke Shaft, RH (12) Differential Yoke Shaft, LH (17) Front Gear Case (3) Bevel Gear (8) Front Axle Case...
  • Page 245 FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 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 246 SERVICING CONTENTS 1. TROUBLESHOOTING.........................3-S1 2. SERVICING SPECIFICATIONS ....................3-S2 3. TIGHTENING TORQUES......................3-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............3-S4 [1] CHECKING AND ADJUSTING....................3-S4 [2] PREPARATION ........................3-S5 (1) Separating Front Axle Assembly ..................3-S5 [3] DISASSEMBLING AND ASSEMBLING ................3-S8 (1) Front Axle Assembly......................3-S8 [4] SERVICING .........................3-S12 KiSC issued 02, 2017 A...

  • Page 247: Troubleshooting

    FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Tire pressure uneven Adjust G-64 Front Wheels Wander to Right or Left Improper toe-in adjustment (improper alignment) Adjust 3-S4 Clearance between center pin and pin support Replace 3-S14...

  • Page 248: Servicing Specifications

    FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. SERVICING SPECIFICATIONS 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 – 5.00 to 12.0 kgf 11.1 to 26.4 lbf...

  • Page 249: Tightening Torques

    FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-13.) Item N·m kgf·m lbf·ft...

  • Page 250: Checking, Disassembling And Servicing

    FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Toe-in 1. Inflate the tires to the specified pressure. 2. Turn the front wheels straight ahead. 3. Measure the toe-in ((B) - (A)). 4. If the measurement is not within the factory specifications, adjust the tie-rod length.

  • Page 251: Preparation

    • When re-filling, remove the right and left breather plugs (1). IMPORTANT • After ten minutes, check the oil level again, add oil to prescribed level. • Use KUBOTA SUPER UDT fluid or SAE80, 90 gear oil. Refer to "4. LUBRICANTS, FUEL AND COOLANT" on page G-9. 2.3 L BX1870D 2.4 U.S.qts...
  • Page 252 FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Battery CAUTION • When disconnecting the battery cables, disconnect the negative cable from the battery first. When connecting, connect the positive cable to the battery first. 1. Remove the under panel (1). 2. Disconnect the negative cable (3) from the battery.
  • Page 253 FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Disconnecting Propeller Shaft 1. Tap out the spring pins (2) and disconnect the universal joint (1) and spiral bevel pinion shaft. (When reassembling) • Apply grease to the splines of the propeller shaft and universal joint.

  • Page 254: Disassembling And Assembling

    FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] DISASSEMBLING AND ASSEMBLING (1) Front Axle Assembly Power Steering Cylinder 1. Remove the cotter pin and remove the slotted nut for tie-rod (1). 2. Remove the power steering cylinder mounting screws and remove the power steering cylinder (2) with tie-rod.
  • Page 255 FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Front Gear Case Cover 1. Remove the front gear case mounting screws and remove the front gear case cover (1) with bevel gear (2). (When reassembling) • Apply grease to the O-ring and be careful not to damage it.
  • Page 256 FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Front Gear Case and Bevel Gear Case 1. Remove the internal snap ring (1). 2. Remove the bevel gear with ball bearing (3) and shim (2). 3. Remove the bevel gear (4). 4. Remove the external snap ring (7).
  • Page 257 FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Bevel Pinion Shaft and Differential Gear Assembly 1. Remove the differential yoke shaft (4), (7). 2. Remove the oil seal (11). 3. Remove the internal snap ring (1). 4. Pull out the bevel pinion shaft (3).

  • Page 258: Servicing

    FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [4] SERVICING Clearance between Differential Case and Differential Side Gear 1. Measure the differential side gear boss O.D.. 2. Measure the differential case bore I.D., and calculate the clearance. 3. Measure the differential case cover bore I.D., and calculate the clearance.
  • Page 259 FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Turning Torque of Bevel Pinion Shaft 1. Clamp the spiral bevel pinion shaft assembly to the vise and tighten the staking nut. 2. Measure the turning torque of bevel pinion shaft. 3. If the turning torque is not within the factory specifications, adjust with the lock nut.
  • Page 260 FRONT AXLE BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Backlash between 12T Bevel Gear and 15T Bevel Gear 1. Stick a strip of wire of solder or plastigauge to three spots on the 15T bevel gear (1) with grease. 2. Fix the front axle case, bevel gear case and front gear case.
  • Page 261 STEERING KiSC issued 02, 2017 A...
  • Page 262 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 4-M1 2. STEERING CONTROLLER......................4-M2 3. STEERING CYLINDER ......................4-M3 KiSC issued 02, 2017 A...
  • Page 263 STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. HYDRAULIC CIRCUIT (1) Steering Controller (2) Steering Cylinder (3) Flow Priority Valve (4) Hydraulic Control Valve Assembly (5) Hydraulic Pump (6) Oil Strainer To PTO Clutch Valve To HST To Hydraulic Cylinder This model is provided with a full hydrostatic power steering.
  • Page 264 STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. STEERING CONTROLLER The steering controller consists of a control valve (4) and a metering device (3).  Control Valve The control valve is a rotating spool type. When the steering wheel is not turned, the position of the spool (7) and sleeve (9) is kept neutral by the centering spring (8).
  • Page 265 STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. 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 Snap Ring (6) Seal Ring (9) External Snap Ring The steering cylinder is single piston both rod double-acting type. This steering cylinder is installed parallel to the front axle and connected to tie-rods.
  • Page 266 SERVICING CONTENTS 1. TROUBLESHOOTING.........................4-S1 2. SERVICING SPECIFICATIONS ....................4-S2 3. TIGHTENING TORQUES......................4-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............4-S4 [1] CHECKING..........................4-S4 (1) Relief Valve ........................4-S4 [2] PREPARATION ........................4-S4 (1) Separating Power Steering Controller ................4-S4 (2) Separating Power Steering Cylinder ................4-S6 [3] DISASSEMBLING AND ASSEMBLING ................4-S8 (1) Power Steering Cylinder....................4-S8 [4] SERVICING ...........................4-S9 KiSC issued 02, 2017 A...

  • Page 267: Troubleshooting

    STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Steering controller malfunctioning Replace 4-S6 Cannot Be Steered Power steering oil improper (Transmission fluid) Change with specified Hard Steering Hydraulic pump malfunctioning Replace 5-S11 Flow priority valve malfunctioning Repair or replace...

  • Page 268: Servicing Specifications

    STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. SERVICING SPECIFICATIONS POWER STEERING BODY Item Factory Specification Allowable Limit Relief Valve Operating 8.34 to 8.82 MPa – Pressure 85.0 to 90.0 kgf/cm 1210 to 1280 psi STEERING CYLINDER Item Factory Specification Allowable Limit Steering Cylinder I.D.

  • Page 269: Tightening Torques

    STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-13.) Item N·m kgf·m lbf·ft Steering wheel mounting nut 20 to 25 2.0 to 2.6...

  • Page 270: Checking, Disassembling And Servicing

    STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING (1) Relief Valve Relief Valve Operating Pressure 1. Disconnect the power steering hose L (or R) from steering controller, and set a pressure gauge and hose. (Reference) • Hose and adaptor size: 9/16-18UNF, 37 ° flare 2.
  • Page 271 STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Steering Wheel 1. Remove the steering wheel cap (1). 2. Remove the steering wheel mounting nut and remove the steering wheel. (When reassembling) 20 to 25 N·m Steering wheel mounting Tightening torque 2.0 to 2.6 kgf·m 15 to 18 lbf·ft...

  • Page 272: Separating Power Steering Cylinder

    STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Steering Controller 1. Disconnect the power steering hoses (1), (2), (3), (4). 2. Remove the steering controller mounting screws and remove the steering controller (5). (When reassembling) • Be sure to connect the power steering hoses to their original position, and tighten them to the specified torque.
  • Page 273 STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Front Axle Assembly 1. Remove the power steering hose clamp (1). 2. Place the garage jack under the front axle. 3. Remove the cotter pin (3). 4. Remove the slotted nut (2) of center pin and separate the front axle from the frame.

  • Page 274: Disassembling And Assembling

    STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] DISASSEMBLING AND ASSEMBLING (1) Power Steering Cylinder Adaptor and Tie-rod 1. Remove the cylinder hose adaptors (4), (6). 2. Remove the tie-rods (2), (8) from piston rod (7). 3. Remove the cylinder holder (1) and internal snap ring (3).

  • Page 275: Servicing

    STEERING BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [4] SERVICING Steering Cylinder I.D. 1. Measure the steering cylinder I.D. with a cylinder gauge. 2. If the cylinder I.D. exceed the allowable limit, replace the cylinder barrel. 40.000 to 40.062 mm Factory specification 1.5748 to 1.5772 in.

  • Page 276: Hydraulic System

    HYDRAULIC SYSTEM KiSC issued 02, 2017 A...
  • Page 277 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 5-M1 2. HYDRAULIC PUMP........................5-M2 3. CONTROL VALVE........................5-M3 4. FLOW PRIORITY VALVE......................5-M6 5. RELIEF VALVE........................... 5-M7 6. HYDRAULIC CYLINDER......................5-M9 7. HYDRAULIC BLOCK TYPE OUTLET ..................5-M10 8. MOWER LINKAGE ........................5-M11 9.

  • Page 278: Hydraulic Circuit

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. HYDRAULIC CIRCUIT (1) Auxiliary Hydraulic Control (4) 3 Point Hitch System (8) Oil Strainer (12) PTO Clutch Valve Valve Assembly (If equipped) (5) Flow Priority Valve (9) PTO Clutch Relief Valve (13) Power Steering Controller...

  • Page 279: Hydraulic Pump

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. HYDRAULIC PUMP The hydraulic pump consists of the casing (1), cover (4), side plate (3), and two spur gears (drive gear (5) and driven gear (2)) that are in mesh. Hydraulic pump is driven by the pump drive shaft in the transmission case.

  • Page 280: Control Valve

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. CONTROL VALVE This position control valve is located under the hydraulic cylinder. This control valve is mechanically connected to the position control lever. Since the feedback rod is not equipped to the lift arm, the neutral position adjustment is adjusted by controlling the position control lever.
  • Page 281 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Lift 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.
  • Page 282 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Down 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.

  • Page 283: Flow Priority Valve

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. FLOW PRIORITY VALVE (1) Hydraulic Pump Gear (2) Hydraulic Pump Case (3) Plug (4) Flow Priority Valve (5) Relief Valve EF: EF Port (To 3 Point Hitch Control Circuit) PF: PF Port (To Power Steering, PTO...

  • Page 284: Relief Valve

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 5. RELIEF VALVE (1) Hydraulic Pump Gear (2) Hydraulic Pump Case (3) Plug (4) Flow Priority Valve (5) Relief Valve (6) Seat (7) Poppet EF: EF Port (To 3 Point Hitch Control Circuit) PF: PF Port...
  • Page 285 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Relief Valve Operating (1) Hydraulic Pump Gear (2) Hydraulic Pump Case (3) Plug (4) Flow Priority Valve (5) Relief Valve EF: EF Port (To 3 Point Hitch Control Circuit) PF: PF Port (To Power Steering, PTO Clutch and HST Circuit) D.C.: Damping Chamber...

  • Page 286: Hydraulic Cylinder

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 6. HYDRAULIC CYLINDER (1) Lift Arm (6) Spring (9) Back-up Ring Pump Port (2) Hydraulic Arm (7) Ball (10) O-ring Cylinder Port (3) Hydraulic Arm Shaft (8) Lowering Speed Adjusting (11) Hydraulic Cylinder (4) Hydraulic Rod...

  • Page 287: Hydraulic Block Type Outlet

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 7. HYDRAULIC BLOCK TYPE OUTLET The hydraulic block type outlet is located on the hydraulic cylinder assembly. This hydraulic block type outlet is provided to take power out from the tractor to operate the hydraulic cylinders on the implement, such as front end loader, front snow blade and so on.

  • Page 288: Mower Linkage

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 8. MOWER LINKAGE (1) Mower Rear Link RH (4) Rear Lift Link LH (7) Lift Arm (10) Lift Lower Boss (2) Lift Pin (5) Cutting Height Adjusting Dial (8) Adjusting Bolt (11) Cam (3) Mower Rear Link LH...

  • Page 289: Front Loader Valve

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 9. FRONT LOADER VALVE [1] STRUCTURE (1) Structure for Front Loader Valve and Pipe (1) Control Lever (4) Pipe (Power Beyond) (7) Pipe (B1) for Boom Cylinder (9) Pipe (A2) for Bucket Cylinder (2) Pipe (Return)

  • Page 290: Structure For Front Loader Control Valve

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Structure for Front Loader Control Valve (1) Inlet and Outlet Section Pump Port A1: A1 Port B1: B1 Port (2) Boom Control Valve Tank Port A2: A2 Port B2: B2 Port (3) Bucket Control Valve...

  • Page 291: Front Loader Hydraulic Circuit

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] FRONT LOADER HYDRAULIC CIRCUIT (1) Boom Control Valve Pump Port A1: A1 Port To Hydraulic Block (2) Bucket Control Valve Tank Port A2: A2 Port (3) Front Loader Control Valve B1: B1 Port B2: B2 Port...

  • Page 292: Operation

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] OPERATION Neutral (1) Boom Control Section (5) PB Passage 1 Tank Port B1: B1 Port (2) Bucket Control Section (6) PB Passage 2 Pump Port B2: B2 Port (3) Spool (7) Load Check Valve A1: A1 Port...
  • Page 293 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (1) Boom Control Section (5) Neutral Passage 1 Pump Port A1: A1 Port (2) Bucket Control Section (6) Load Check Valve Tank Port (From Boom Cylinder) (3) Spool (7) Passage 1 B1: B1 Port (4) PB Passage 1...
  • Page 294 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Down (1) Boom Control Section (5) Neutral Passage 1 Pump Port A1: A1 Port (2) Bucket Control Section (6) Load Check Valve Tank Port (To Boom Cylinder) (3) Spool (7) Passage 1 B1: B1 Port (4) PB Passage 1...
  • Page 295 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Floating (1) Boom Control Section (5) Detent Mechanism Pump Port A1: A1 Port (2) Bucket Control Section (6) Neutral Passage 1 Tank Port B1: B1 Port (3) Spool (7) Boom Cylinder PB: Power Beyond Port (4) PB Passage 1 Low Pressure 1.
  • Page 296 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Roll-back (1) Boom Control Section (6) PB Passage 2 Pump Port B2: B2 Port (2) Bucket Control Section (7) Load Check Valve Tank Port (To Bucket Cylinder) (3) PB Passage 1 (8) Passage 2 PB: Power Beyond Port...
  • Page 297 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Dump 1 (1) Boom Control Section (6) PB Passage 2 Pump Port A2: A2 Port (2) Bucket Control Section (7) Load Check Valve Tank Port (To Bucket Cylinder) (3) PB Passage 1 (8) Passage 2 PB: Power Beyond Port...
  • Page 298 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Dump 2 (1) Boom Control Section (6) PB Passage 2 Pump Port A2: A2 Port (2) Bucket Control Section (7) Load Check Valve Tank Port (To Bucket Cylinder) (3) PB Passage 1 (8) Passage 2 PB: Power Beyond Port...
  • Page 299 SERVICING CONTENTS 1. TROUBLESHOOTING.........................5-S1 2. SERVICING SPECIFICATIONS ....................5-S2 3. TIGHTENING TORQUES......................5-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............5-S4 [1] CHECKING AND ADJUSTING....................5-S4 (1) Relief Valve ........................5-S4 (2) Pump and Priority Valve ....................5-S5 (3) Mower Lift Linkage ......................5-S7 [2] PREPARATION ........................5-S8 [3] SEPARATING ........................5-S11 (1) Hydraulic Cylinder Block....................5-S11 (2) Hydraulic Pump ......................5-S11 [4] DISASSEMBLING AND ASSEMBLING ................5-S12...

  • Page 300: Troubleshooting

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Control valve broken Replace 5-S12 Implement Does Not Rise (No Noise) Control valve improperly assembled Repair 5-S12 Relief valve spring damaged Replace 5-S4 Spool sticks Repair 5-S12 Piston O-ring or cylinder damaged...

  • Page 301: Servicing Specifications

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Relief Valve Setting Pressure 12.3 to 12.7 MPa – 125 to 130 kgf/cm (Condition) • Engine Speed: 1780 to 1840 psi Maximum • Oil Temperature: 45 to 55 °C (113 to 131 °F)

  • Page 302: Tightening Torques

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-13.) Item N·m kgf·m lbf·ft...

  • Page 303: Checking, Disassembling And Servicing

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Relief Valve Relief Valve Setting Pressure 1. Remove the hydraulic pipe (1). 2. Install the hose and adaptor A (3) with pressure gauge (2). 3. Start the engine and set at maximum speed.

  • Page 304: Pump And Priority Valve

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Pump and Priority Valve Checking Power Steering Oil Flow IMPORTANT • Use the instruction with the flowmeter when you use the flowmeter. • While testing, do not close the flowmeter loading valve completely. 1. Disconnect the power steering controller hose (Inlet) (1) from the power steering pipe (2).
  • Page 305 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking 3-point Hitch Oil Flow IMPORTANT • Use the instruction with the flowmeter when you use the flowmeter. • While testing, do not close the flowmeter loading valve completely. 1. Remove the hydraulic pipe behind the hydraulic cylinder and fix the flow meter hose and the flow (meter) inlet as shown in the photo.

  • Page 306: Mower Lift Linkage

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (3) Mower Lift Linkage Mower Lift Linkage After reassembling the mower lift linkage, be sure to adjust it as follows. 1. Check the lift arm free play. 2. Loosen the adjusting nut (1) and start the engine.

  • Page 307: Preparation

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] PREPARATION Battery CAUTION • When disconnecting the battery cables, disconnect the negative cable from the battery first. When connecting, connect the positive cable to the battery first. 1. Remove the under panel. 2. Disconnect the negative cable (2) from the battery (1).
  • Page 308 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Seat 1. Disconnect the seat switch connectors. 2. Remove the snap pins (2) to remove the seat (1). (1) Seat (2) Snap Pin 9Y1210855TXS0018US0 Speed Control Pedal and Step 1. Remove the valve covers (3). 2. Remove the speed control pedals (1) and step (2).
  • Page 309 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Fender Center Stay 1. Remove the fender bracket (2). 2. Remove the fender center stay (1). (When reassembling) 124 to 147 N·m Fender bracket mounting Tightening torque 12.6 to 15.0 kgf·m bolt 91.2 to 108 lbf·ft...

  • Page 310: Separating

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] SEPARATING (1) Hydraulic Cylinder Block Hydraulic Cylinder Block 1. Remove the hydraulic pipe (1). 2. Remove the hydraulic cylinder block mounting bolt. 3. Remove the hydraulic cylinder block (2). (When reassembling) 40 to 44 N·m...

  • Page 311: Disassembling And Assembling

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [4] DISASSEMBLING AND ASSEMBLING (1) Hydraulic Cylinder and Control Valve Control Valve 1. Remove the control valve (1). 2. Remove the internal snap ring (4) and draw out the spool (2). (1) Control Valve (3) Plain Washer...
  • Page 312 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Hydraulic Piston 1. Inject the compressed air into the hydraulic cylinder, and remove the hydraulic piston (1). (When reassembling) • Be careful not to damage the O-ring (3) and back-up ring (2). • Apply transmission fluid to the O-ring.

  • Page 313: Mower Lift Linkage

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Mower Lift Linkage Disassembling Mower Linkage (1) Mower Rear Link, RH (2) Lift Link Rear, RH (3) Cutting Height Adjusting Dial Knob (4) Cutting Height Adjusting (5) Lift Arm, LH (6) Link Adjusting Bolt (7) Lift Link Rear, LH...

  • Page 314: Control Valve (Front Loader)

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (3) Control Valve (Front Loader) Step and Battery CAUTION • When disconnecting the battery cables, disconnect the negative cable from the battery first. When connecting, connect the positive cable to the battery first. 1. Remove the under panel (1).
  • Page 315 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Control Valve 1. Remove the loader frame (6). 2. Disconnect the cruise control rod (2). 3. Disconnect the front loader control rods (3). 4. Remove the brake spring. 5. Remove the arms (4) from spool end.
  • Page 316 HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Disassembling Control Valve (1) Seal (2) Seal (3) Dust Seal (4) Dust Seal (5) Load Check Valve (6) Spring (7) O-ring (8) Plug (9) Bolt (10) Plug (11) Seat (12) Spring (13) Ball (14) Stopper (15) Ring...

  • Page 317: Servicing

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [5] SERVICING (1) Hydraulic Pump Clearance between Tip of Gear Tooth and Casing 1. Measure the gear O.D. with an outside micrometer. 2. Measure the casing I.D. with a cylinder gauge and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace the assembly.

  • Page 318: Hydraulic Cylinder

    HYDRAULIC SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Hydraulic Cylinder Hydraulic Cylinder Bore 1. Check the cylinder internal surface for scoring or damage. 2. Measure the cylinder I.D. with a cylinder gauge. 3. If the measurement exceeds the allowable limit, replace the hydraulic cylinder block.
  • Page 319 ELECTRICAL SYSTEM KiSC issued 02, 2017 A...
  • Page 320 MECHANISM CONTENTS 1. WIRING DIAGRAM........................6-M1 2. STARTING SYSTEM........................6-M2 [1] MAIN SWITCH POSITION ....................6-M2 [2] SAFETY SWITCH ........................ 6-M3 [3] OPERATOR PRESENCE CONTROL (OPC) ............... 6-M4 3. CHARGING SYSTEM......................... 6-M5 [1] ELECTRICAL CIRCUIT ......................6-M5 [2] IC REGULATOR (3P CONNECTOR TYPE) ................ 6-M6 4.

  • Page 321: Wiring Diagram

    BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM ELECTRICAL SYSTEM 1. WIRING DIAGRAM 6-M1 KiSC issued 02, 2017 A...

  • Page 322: Starting System

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. STARTING SYSTEM [1] MAIN SWITCH POSITION (1) Fuse (6) HST Neutral Switch (11) Alternator (15) Fuel Pump (2) Seat Switch (7) Main Switch (12) Glow Indicator (16) Solenoid (3) Seat Turn Over Switch (8) Slow Blow Fuse...

  • Page 323: Safety Switch

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] SAFETY SWITCH This switch is electrically closed in normal condition (normally closed type). The switch operates as sensor detecting and transmitting the position of HST pedal, PTO lever, independent PTO lever, and seat to engine stop solenoid.

  • Page 324: Operator Presence Control (Opc)

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] OPERATOR PRESENCE CONTROL (OPC) The BX Tractor equips operator presence control (OPC) system which automatically stops the engine when operator stands up from the operator's seat while shifting the PTO lever or the speed control pedal.

  • Page 325: Charging System

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. CHARGING SYSTEM [1] ELECTRICAL CIRCUIT (1) Meter Panel (4) Main Switch (6) Starter Motor (8) Alternator (2) Battery Charge Indicator (5) Slow Blow Fuse (7) Battery (9) Frame Earth (3) Fuse The charging system supplies electric power for various electrical devices and also charges the battery while the engine runs.

  • Page 326: Ic Regulator (3P Connector Type)

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] 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).

  • Page 327: Lighting System

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. LIGHTING SYSTEM (1) Meter Panel (7) Turn (Left) (13) Oil Pressure Switch (19) Slow Blow Fuse (2) Fuel Gauge (8) Turn (Right) (14) Flasher Unit (20) Starter Motor (3) Water Temperature Gauge (9) Tail Light (12.8 W) (15) Head Light (37.5 W)

  • Page 328: Gauges

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 5. GAUGES [1] ELECTRICAL CIRCUIT (1) Fuel Gauge (4) Thermo Unit (7) Main Switch (10) Alternator (2) Water Temperature Gauge (5) Fuel Sensor (8) Starter Motor (11) Frame Earth (3) Hour Meter (6) Fuse (9) Battery The fuel quantity is indicated by the fuel gauge.

  • Page 329: Hour And Tachometer

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] HOUR AND TACHOMETER The electrical hour meter and tachometer is equipped on the meter panel. This meter indicates the operated hours when the main switch is turned to "ON" position. After starting the engine, this meter indicates the present engine revolution.

  • Page 330: Water Temperature Gauge

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [4] WATER TEMPERATURE GAUGE Water temperature gauge is located on the meter panel board. The water temperature gauge and the thermo unit are connected by the wiring. The water temperature gauge detects the resistance from the thermo unit.

  • Page 331: Others

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 6. OTHERS [1] DC OUTLET DC outlet is equipped to this machine. The capacity of the DC outlet is 12 V / 120 W. The electrical device as a CD player, a mobile phone battery charger can be used to the DC outlet.
  • Page 332 SERVICING CONTENTS 1. TROUBLESHOOTING.........................6-S1 2. SERVICING SPECIFICATIONS ....................6-S5 3. TIGHTENING TORQUES......................6-S6 4. CHECKING, DISASSEMBLING AND SERVICING ..............6-S7 [1] CHECKING AND ADJUSTING....................6-S7 (1) Battery ..........................6-S7 (2) Main Switch ........................6-S9 (3) Starter..........................6-S10 (4) Glow Plug ........................6-S11 (5) Safety Switch.........................6-S12 (6) Operator Presence Control (OPC) Switch..............6-S14 (7) Fuel Pump ........................6-S15 (8) Engine Stop Solenoid ....................6-S16 (9) Timer Relay ........................6-S16...

  • Page 333: Troubleshooting

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. TROUBLESHOOTING FUSE AND WIRING Reference Symptom Probable Cause Solution Page Battery discharged or damaged Recharge or replace G-26 All Electrical Equipments Do Not Battery positive cable disconnected or improperly Repair or replace – Operate connected...
  • Page 334 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM OPERATOR PRESENCE CONTROL (OPC) Reference Symptom Probable Cause Solution Page Solenoid fuse blown (15 A) Replace G-41 Engine Does Not Stop Engine stop solenoid relay damaged Replace 6-S16 Engine stop solenoid damaged Replace 6-S16 PTO shift lever switch damaged...
  • Page 335 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM LIGHTING SYSTEM Reference Symptom Probable Cause Solution Page Fuse blown (15 A) Replace G-41 Head Light Does Not Light Bulb blown Replace G-41 Wiring harness disconnected or improperly Repair or replace – connected (between main switch AC terminal...
  • Page 336 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Reference Symptom Probable Cause Solution Page Engine oil pressure too low Repair engine – Oil Pressure Lamp Lights Up When Engine oil insufficient Fill Engine Is Running Oil pressure switch damaged Replace 6-S23 Short circuit between oil pressure switch lead Repair –...

  • Page 337: Servicing Specifications

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Battery Voltage More than – 12 V Potential Less than – Difference 0.1 V Glow Plug Resistance Approx. 0.9 Ω – Alternator Charging Current / 14 to 15 A / –...
  • Page 338 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-13.) Item N·m kgf·m lbf·ft Starter B terminal nut 5.9 to 11.8...

  • Page 339: Checking, Disassembling And Servicing

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING CAUTION • To avoid accidental short circuit, be sure to attach the positive cable to the positive terminal before the negative cable is attached to the negative terminal.
  • Page 340 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Battery Specific Gravity 1. Check the specific gravity of the electrolyte in each cell with a hydrometer. 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).

  • Page 341: Main Switch

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Main Switch Main Switch Connector Voltage 1. Remove the under cover panel. 2. Disconnect the 4P connector and remove the main switch (1). 3. Measure the voltage with a voltmeter across the connector 30 (red) terminal and chassis.

  • Page 342: Starter

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (3) Starter Motor Test CAUTION • Secure the starter to prevent if from jumping up and down while testing the motor. 1. Disconnect the battery negative cable from the battery. 2. Disconnect the battery positive cable and the leads from the starter.

  • Page 343: Glow Plug

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (4) Glow Plug Lead Terminal Voltage 1. Disconnect the wiring lead (2) from the glow plug (1) after turning the main switch off. 2. Turn the main switch key to the "PREHEAT" position, and measure the voltage between the lead terminal and the chassis.

  • Page 344: Safety Switch

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (5) Safety Switch PTO Shift Lever Switch Continuity 1. Remove the left rear wheel. 2. Remove the PTO shift lever switch (1). 3. Measure the resistance with an ohmmeter across the switch terminals. 4. If the resistance values specified below are not indicated, the safety switch is faulty.
  • Page 345 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM HST Neutral Switch Continuity 1. Remove the right rear wheel. 2. Remove the HST neutral switch (1). 3. Measure the resistance with an ohmmeter across the HST neutral switch terminals. 4. If the resistance values specified below are not indicated, the safety switch is faulty.

  • Page 346: Operator Presence Control (Opc) Switch

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (6) Operator Presence Control (OPC) Switch Seat Switch and Seat Turnover Switch Continuity Check 1. Disconnect the 2P connectors (2) from the seat turnover switch (1) and the seat switch. 2. Remove the seat turnover switch (1).

  • Page 347: Fuel Pump

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking OPC Timer 1. Remove the OPC timer. (The OPC timer is located under the fender center stay.) 2. Connect the jumper leads across the battery terminal and the Red / White terminal (2), and across the battery positive terminal and the Yellow terminal (3).

  • Page 348: Engine Stop Solenoid

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Fuel Pump Continuity 1. Disconnect the 2P connector from the fuel pump. 2. Check the continuity between the connector terminals with an ohmmeter. 3. If it does not conduct, the fuel pump is faulty. 9Y1210855ELS0019US0 (8) Engine Stop Solenoid Engine Stop Solenoid Test 1.

  • Page 349: Charging System

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (10) Charging System Battery Charging Current 1. After starting the engine, disconnect the battery positive cord (+), and connect an ammeter and voltmeter. Then switch on all electrical loads (such as head lights) and measure the charging current.
  • Page 350 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2) Head Light Switch Continuity when Setting Switch at "OFF" Position 1. Set the light switch to the OFF position. 2. Measure the resistance with an ohmmeter across the red / yellow lead (1) to the orange lead (4), the red / yellow lead (1) to the yellow lead (3).
  • Page 351 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4) Turn Signal Light Switch Continuity when Setting Switch Knob "OFF" Position 1. Set the turn signal switch knob to the OFF position. 2. Measure the resistance with an ohmmeter across the green lead (1) and red / white lead (2), and across to the green lead (1) and green / white lead (3).
  • Page 352 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 6) Turn Signal Light Switch Continuity when Setting Switch Knob "LEFT" Position 1. Set the turn signal switch knob to the LEFT position. 2. Measure the resistance with an ohmmeter across the green lead (1) and red / white lead (2), and across to the green lead (1) and green / white lead (3).
  • Page 353 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 8) Hazard Switch Knob at "ON" Position 1. Set the hazard switch knob to the ON position. 2. Measure the resistance with an ohmmeter across the black / blue lead (1) and blue / white lead (2).
  • Page 354 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Flasher Unit Actuation Test 1. Set the hazard switch to the ON position, and make sure the hazard lamp gives 60 to 85 flashes for a minute. 2. With the main switch and the hazard switch at the ACC and ON positions, respectively, move the turn signal light switch to the left.

  • Page 355: Gauge

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Engine Oil Pressure Lamp 1. Disconnect the lead (2) from the engine oil pressure switch (1) after turning the main switch OFF. 2. Turn the main switch ON and connect a jumper lead from the lead to the chassis.
  • Page 356 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Coolant Temperature Sensor (Thermo Unit) 1) Lead Terminal Voltage 1. Disconnect the lead from the coolant temperature sensor after turning the main switch OFF. 2. Turn the main switch ON and measure the voltage with a voltmeter across the lead terminal and the chassis.

  • Page 357: Dc Outlet

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (13) DC Outlet DC Outlet Connector Voltage and DC Outlet Continuity 1. Disconnect the connector from the DC outlet. And turn the main switch "ON". 2. Measure the voltage with a voltmeter across the connector red / blue lead and the chassis.
  • Page 358 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Hand Throttle Lever and Grip 1. Remove the throttle wire cable (1). 2. Remove the hand throttle lever nuts (2). 3. Remove the cruise lever grip (8) and hand throttle lever grip (7). 4. Remove the upper panel (6) mounting screw.
  • Page 359 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [B] Checking Meter Panel CAUTION • For checking of electric circuit, use the circuit tester. • As for the checking of sensors and switches, do the following order; check the battery, fuse and grounding line first, check by the test function of meter panel next, and check the connectors of panel or related electronic switch or sensor.

  • Page 360: Disassembling And Assembling

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Starter Motor 1. Disconnect the connecting lead (9) from the magnet 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 361: Alternator

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Alternator Pulley 1. Secure the hexagonal end of the pulley shaft with a double-ended ratchet wrench as shown in the figure, loosen the pulley nut with a socket wrench and remove it. (When reassembling) 58.4 to 78.9 N·m...
  • Page 362 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Rear End Frame 1. Remove the two nuts and two screws holding the drive end frame and the rear end frame. 2. Remove the rear end frame (1). (1) Rear End Frame 9Y1210855ELS0061US0 Rotor 1. Press out the rotor (1) from drive end frame (3).

  • Page 363: Servicing

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] SERVICING (1) Starter Overrunning Clutch 1. Inspect the pinion for wear or damage. 2. If there is any problem, replace the overrunning clutch assembly. 3. Check that the pinion turns freely and smoothly in the overrunning direction and does not slip in the cranking direction.
  • Page 364 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Brush Holder 1. Check the continuity across the brush holder and the holder support with an ohmmeter. 2. If it conducts, replace the brush holder. 9Y1210855ELS0058US0 Armature Coil 1. Check the continuity across the commutator and armature coil core with an ohmmeter.

  • Page 365: Alternator

    ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Alternator Bearing 1. Check the bearing for smooth rotation. 2. If it does not rotate smoothly, replace it. WSM000001ELS0039US0 Stator 1. Measure the resistance across each lead of the stator coil with resistance range of circuit tester.
  • Page 366 ELECTRICAL SYSTEM BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Rectifier 1. Check the continuity across each diode of rectifier with resistance range of circuit tester. 2. The rectifier is normal if the diode in the rectifier conducts in one direction and does not conduct in the reverse direction.
  • Page 367 MOWER KiSC issued 02, 2017 A...
  • Page 368 MECHANISM CONTENTS 1. POWER TRANSMISSION......................7-M1 2. LIFTING MECHANISM ....................... 7-M2 3. SELF-BALANCER SYSTEM ...................... 7-M3 KiSC issued 02, 2017 A...
  • Page 369 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. POWER TRANSMISSION (1) Bevel Gear (4) Universal Joint (7) Center Pulley (10) Blade Shaft (2) Bevel Gear (5) Mid-PTO Shaft (8) Bevel Gear Shaft (11) Outer Pulley (3) Pinion Shaft (6) Center Blade (9) Mower Belt...
  • Page 370 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. LIFTING MECHANISM (1) Front Link (3) Lift Link (5) Rear Lift Link (LH) (6) Lift Arm (2) Rear Link (4) Rear Lift Link (RH) The lifting of mower is performed by the hydraulic system installed on the tractor.
  • Page 371 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. SELF-BALANCER SYSTEM This system reduces the stepped differences in cutting height when mowing rolling terrain. 9Y1210855MOM0003US0  Self-Balancer 1. The mower deck is held in place via the balancer plate (4) and the support by the rear link (1), (2).
  • Page 372 SERVICING CONTENTS 1. TROUBLESHOOTING.........................7-S1 2. SERVICING SPECIFICATIONS ....................7-S2 3. TIGHTENING TORQUES......................7-S3 4. SETTING UP MOWER ........................7-S4 [1] RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX, and RCK54P-23BX ....7-S4 [2] RCK54D-26BX, RCK60D-26BX ....................7-S7 5. CHECKING AND ADJUSTING....................7-S13 [1] MOWER ADJUSTMENT .....................7-S13 [2] CHECKING MOWER BLADE AND BELT ................7-S17 6.
  • Page 373 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Mid-PTO system malfunctioning Check transmission 2-S39 Blade Does Not Turn Mower belt broken Replace mower belt 7-S18 Mower belt loosen Replace mower belt 7-S18 Blade Speed Is Slow or tension spring...

  • Page 374: Servicing Specifications

    MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Stopper and Rear Link Clearance 0 to 0.5 m – 0 to 0.01 in. Front Tip and Rear Tip of Blade Difference 0.0 to 5.0 mm – 0.0 to 0.20 in.
  • Page 375 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-13.) [RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK54D-26BX and RCK60D-26BX] Item N·m...

  • Page 376: Setting Up Mower

    MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. SETTING UP MOWER [1] RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX, and RCK54P-23BX Assembling Mower 1. Place the mower on blocks as illustrated. Turn the anti-scalp rollers sideways and attach to the arms of the deck at the upper position with clevis pins and snap rings.
  • Page 377 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Universal Joint 1. Pull back the coupler (3) of the universal joint (2). 2. Push the universal joint (2) onto the mid-PTO shaft (1), until the coupler locks. 3. Slide the universal joint back and forward to make sure theuniversal joint is locked securely.
  • Page 378 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Front Link 1. Hook the front link (1) to the front bracket groove (2) as shown in the figure. (Reference) • Make sure the length "L" of the front link (1) is 47 mm (1.85 in.). (1) Front Link...

  • Page 379: Rck54D-26Bx, Rck60D-26Bx

    MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] RCK54D-26BX, RCK60D-26BX Assembling Mower 1. Place the mower on blocks as illustrated. 2. Attach all the anti-scalp rollers to the arms of the deck. Put clevis pins from outside and snap rings inside in the "F" position.
  • Page 380 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Setting Mower WARNING To avoid serious injury: • Park the tractor on a firm, flat and level surface, set the parking brake, stop the engine and remove the key. • Clean up mower deck, slope and frame link. Make sure there is no debris inside the universal joint.
  • Page 381 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Front Link 1. Place all front link and frame link under the tractor. 2. Attach the stay link (1) with the nut (2) on the tractor front frame. CAUTION To avoid personal injury: • Attach the stay link left and right. Do not loosen both left and right side nuts at the same time.
  • Page 382 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Frame Link 1. Place blocks below the frame link if one person does the setting. Heights of blocks are recommended value for attaching. 2. Start engine. Set the cutting height to 0" and lower the frame link. Then stop the engine.
  • Page 383 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Setting Tractor 1. Make sure that the frame link (1) is lifted up to the "TOP" position when tractor is traveling without mower. Stop the tractor behind the mower. Set the parking brake. 2. Set the cutting height to 0" and lower the frame link (1). Then stop the engine.
  • Page 384 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Mounting Mower 1. Start the engine and engage 4WD. Set the range gear shift lever to "LOW". Release the parking brake. 2. With the right front tire, make a driving target to the guide (1). 3. Drive over the ramp of mower along the guide (1). Keep the front tire side touching the guide rod.

  • Page 385: Checking And Adjusting

    MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 5. CHECKING AND ADJUSTING [1] MOWER ADJUSTMENT WARNING To avoid serious injury: • Park the tractor on a firm, flat and level surface and set the parking brake. • Stoop the engine, remove the key, and allow the blades to stop before making adjustments.
  • Page 386 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Adjusting Front and Rear Cutting Height [RCK54D-26BX and RCK60D-26BX] 1. Park the machine on a firm, flat and level surface and set the parking brake. 2. Tire pressure must be correct. (See "[1] TIRE PRESSURE" in "GENERAL" section.
  • Page 387 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Adjusting Left and Right Cutting Height 1. Tire pressure must be correct. 2. Operate the hydraulic control lever (2) rearward to raise the mower deck to the highest position. 3. Stop the engine and remove the key.
  • Page 388 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Cutting Height DANGER To avoid serious injury or death: • Never operate the mower in transport position. IMPORTANT • (for self-balance suspended linkage) To reduce the stepped difference in cutting height when mowing rolling terrain, follow the procedure below.

  • Page 389: Checking Mower Blade And Belt

    MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] CHECKING MOWER BLADE AND BELT WARNING To avoid serious injury or death: • Be sure to stop the engine and remove the key. • Blades may be sharp. When you handle blades, wear heavy gloves or wrap end of blade with a rag.
  • Page 390 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking Mower Belt [RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX and RCK54P-23BX] 1. Check to see the mower belt. 2. Replace the mower belt with a new one, if there is found surface split at more than 3 positions. (When replacing mower belt) 1.
  • Page 391 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Checking Mower Belt [RCK54D-26BX and RCK60D-26BX] 1. Check to see the mower belt. 2. Replace the mower belt with a new one, if there is found surface split at more than 3 positions. (When replacing mower belt) 1.

  • Page 392: Disassembling And Servicing

    MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 6. DISASSEMBLING AND SERVICING [1] DISASSEMBLING AND ASSEMBLING Universal Joint and Belt Cover [RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK48P-18BX and RCK54P-23BX] 1. Remove the universal joint screw. 2. Remove the universal joint (1). 3. Remove the left and right belt covers (2), (3).
  • Page 393 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Blade Boss 1. Remove the external snap ring (2). 2. Remove the blade boss (1). (1) Blade Boss [A] RCK48P-18BX and RCK54P-23BX (2) External Snap Ring [B] RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK54D-26BX and RCK60D-26BX 9Y1210855MOS0020US0 Gear Box and Mower Belt 1.
  • Page 394 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Disassembling Gear [RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK54D-26BX and RCK60D-26BX] 1. Remove the drain plug (1), and drain the gear box oil. 2. Remove the center pulley (20) with a puller, and remove the feather key (18) on the bevel gear shaft (19).
  • Page 395 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Disassembling Gear Box [RCK48P-18BX and RCK54P-23BX] 1. Remove the drain plug (6), and drain the gear box oil. 2. Remove the center pulley (20) with a puller. 3. Remove the gear box. 4. Open the gear box.
  • Page 396 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Center Pulley Holder 1. Remove the center pulley holder bolt (1), (15) / center pulley nut (5), (11). 2. Remove the upper oil seal (6) and lower oil seal (4). 3. Remove the internal snap ring (3) and ball bearing (2).
  • Page 397 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Outer Pulley and Blade Shaft [RCK48-18BX, RCK54-23BX, RCK60B-23BX, RCK54D-26BX and RCK60D-26BX] 1. Remove the outer pulley mounting nut (2), and remove the outer pulley (6). 2. Remove the outer pulley holder mounting nut (10), and remove the outer pulley holder (16).
  • Page 398 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Outer Pulley Blade Shaft [RCK48P-18BX RCK54P-23BX] 1. Remove the outer pulley mounting nut (2), and remove the outer pulley (5). 2. Remove the outer pulley holder mounting nut (8), and remove the outer pulley holder (11). 3. Remove the oil seal (6) and tap out the blade shaft (16) with the ball bearings (14) and (7), taking care not to damage the grease fitting (1).
  • Page 399 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] SERVICING Turning Torque of Pinion Shaft 1. Set the blade screw (4) for the blade shaft to measure the turning torque. 2. Turn the blade screw (4) clockwise with torque wrench and measure the turning torque Less than 0.7 N·m...
  • Page 400 MOWER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Backlash between Bevel Gears 1. Remove the gear box cap (3). 2. Place the plastigauges or wire of solder the bevel gear (2) on the input shaft (5). 3. Turn the input shaft (5). 4. Remove the plastigauges or wire of solder, and measure the thickness with the gage or an outside micrometer.
  • Page 401 FRONT LOADER KiSC issued 02, 2017 A...
  • Page 402 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT SCHEMATIC ..................8-M1 2. CONTROL VALVE ASSEMBLY ....................8-M2 3. BOOM CYLINDER AND BUCKET CYLINDER ................8-M3 KiSC issued 02, 2017 A...
  • Page 403 FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. HYDRAULIC CIRCUIT SCHEMATIC (1) Bucket Control Valve (2) Bucket Cylinder (3) Boom Cylinder (4) Boom Control Valve (5) Control Valve Assembly From Pump P.B.: To 3 Point Hydraulic System To Tank 1A: 1A Port 2A: 2A Port...
  • Page 404 FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. CONTROL VALVE ASSEMBLY 1. Refer to the "5. HYDRAULIC SYSTEM" section. (See page 5-M12.) 9Y1210855FLM0002US0 8-M2 KiSC issued 02, 2017 A...
  • Page 405 FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. BOOM CYLINDER AND BUCKET CYLINDER (1) Nut (3) Cylinder Tube (4) Head (5) Piston Rod (2) Piston Both boom cylinder and bucket cylinder consists of a head (4), cylinder tube (3), piston rod (5), piston (2), and other parts as shown in the figure above.
  • Page 406 SERVICING CONTENTS 1. TROUBLESHOOTING.........................8-S1 2. SERVICING SPECIFICATIONS ....................8-S2 3. TIGHTENING TORQUES......................8-S3 4. DISASSEMBLING AND SERVICING ..................8-S4 [1] DISMOUNTING AND MOUNTING FRONT LOADER............8-S4 (1) Dismounting Front Loader From Tractor .................8-S4 (2) Mounting Front Loader to Tractor..................8-S5 [2] FRONT LOADER ........................8-S6 (1) Bucket, Boom and Hydraulic Cylinders ................8-S6 (2) Side Frames, Front Guard and Main Frames..............8-S9 [3] SERVICING .........................8-S10 KiSC issued 02, 2017 A...
  • Page 407 FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Control valve malfunctioning Repair or replace 5-S16 Boom Does Not Rise Boom cylinder damaged Repair or replace 8-S7 Control lever linkage damaged Repair or replace 5-S16 Hydraulic pump malfunctioning...

  • Page 408: Servicing Specifications

    FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Piston Rod Bend – 0.25 mm 0.0098 in. 9Y1210855FLS0002US0 8-S2 KiSC issued 02, 2017 A...
  • Page 409 FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-13.) Item N·m kgf·m lbf·ft...

  • Page 410: Disassembling And Servicing

    FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM 4. DISASSEMBLING AND SERVICING [1] DISMOUNTING AND MOUNTING FRONT LOADER IMPORTANT • When dismounting the loader, park the tractor on flat and hard ground, apply the parking brake. • When starting the engine or using the hydraulic control valve, always sit in the operator's seat.

  • Page 411: Mounting Front Loader To Tractor

    FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM (2) Mounting Front Loader to Tractor Side Frame and Hoses 1. Slowly drive the tractor between the loader side frames until the rear portion of both side frames touches the main frames as shown. 2. Stop the engine.

  • Page 412: Front Loader

    FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [2] FRONT LOADER (1) Bucket, Boom and Hydraulic Cylinders Bucket (Quick Hitch) NOTE • Attachments should be located on a flat, firm surface when attaching and detaching them. 1. Remove the both snapper pins (2) and hitch pins (1).
  • Page 413 FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Bucket Cylinder CAUTION To avoid personal injury: • Before you disconnect hydraulic hoses, be sure to release all pressure. 1. Disconnect the hydraulic hoses from the bucket cylinder. 2. Remove lower pin and upper pin and remove the bucket cylinder (1).
  • Page 414 FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Piston Rod Assembly 1. Drain hydraulic oil from the cylinder, and secure the tube end of the cylinder in a vise. 2. Remove the cylinder head (1) with the adjustable gland nut wrench (4). 3. Pull out the piston rod assembly (2) from the cylinder tube (3).

  • Page 415: Side Frames, Front Guard And Main Frames

    FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM Installing O-ring and Piston Seal 1. Place the slide jig (2) on the piston (4). 2. Install the O-ring (3) to the piston using the slide jig. 3. Install the piston seal (1) over the O-ring using the slide jig.

  • Page 416: Servicing

    FRONT LOADER BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM [3] SERVICING Piston Rod Bend 1. Place piston rod on V blocks. 2. Set a dial indicator on the center of the rod. 3. Turn the piston rod and read the dial indicator. 4. If the measurement exceeds the allowable limit, replace it.
  • Page 417 : Farm Machinery International Service Department Address 64, Ishizu-Kitamachi, Sakai-Ku, Sakai-City, Osaka, 590-0823, Japan Phone +81- 72-241-1129 +81- 72-245-2484 E-mail : ks_g.ksos-pub@kubota.com Printed in Japan 2017. 02, S, EI, EI, engusa Code No.9Y111-08554 2012. 12, S, EI, EI, engusa KUBOTA Corporation...

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