Kubota MX5100 Workshop Manual

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This Workshop Manual has been prepared to provide servicing personnel with

information on the mechanism, service and maintenance of MX5100. It is divided into

three parts, "General", "Mechanism" and "Servicing".

General

Information on the tractor identification, the general precautions, maintenance check

list, check and maintenance and special tools are described.

Mechanism

Information on the construction and function are included. This part should be

understood before proceeding with troubleshooting, disassembling and servicing.

Refer to Diesel Engine / Tractor Mechanism Workshop Manual (Code No. 9Y021-

01874 / 9Y021-18201) for the one which has not been described to this workshop

manual.

Servicing

Information on the troubleshooting, servicing specification lists, tightening torque,

checking and adjusting, disassembling and assembling, and servicing which cover

procedures, precautions, factory specifications and allowable limits.

All information illustrations and specifications contained in this manual are based on

the latest product information available at the time of publication.

The right is reserved to make changes in all information at any time without notice.

Due to covering many models of this manual, information or picture being used, have

not been specified as one model.

TO THE READER

November 2007

Table of Contents

Chapters

Table of Contents

Troubleshooting

Summary of Contents for Kubota MX5100

Page 1 TO THE READER This Workshop Manual has been prepared to provide servicing personnel with information on the mechanism, service and maintenance of MX5100. It is divided into three parts, “General”, “Mechanism” and “Servicing”. General Information on the tractor identification, the general precautions, maintenance check list, check and maintenance and special tools are described.
Page 3 MX5100, WSM SAFETY INSTRUCTIONS SAFETY INSTRUCTIONS SAFETY FIRST This symbol, the industry’s “Safety Alert Symbol”, is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully. It is essential that you read the instructions and safety regulations before you attempt to repair or use this unit.
Page 4 MX5100, WSM SAFETY INSTRUCTIONS SAFETY STARTING • Do not start the engine by shorting across starter terminals or bypassing the safety start switch. • Do not alter or remove any part of machine safety system. • Before starting the engine, make sure that all shift levers are in neutral positions or in disengaged positions.
Page 5 MX5100, WSM SAFETY INSTRUCTIONS AVOID FIRES • Fuel is extremely flammable and explosive under certain conditions. Do not smoke or allow flames or sparks in your working area. • To avoid sparks from an accidental short circuit, always disconnect the battery negative cable first and connect it last.
Page 6 MX5100, WSM SAFETY INSTRUCTIONS PREPARE FOR EMERGENCIES • Keep a first aid kit and fire extinguisher handy at all times. • Keep emergency numbers for doctors, ambulance service, hospital and fire department near your telephone.
Page 7: Safety Decals
MX5100, WSM SAFETY INSTRUCTIONS 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.
Page 8 MX5100, WSM SAFETY INSTRUCTIONS...
Page 9 MX5100, WSM SAFETY INSTRUCTIONS...
Page 10: Specifications
MX5100, WSM SPECIFICATIONS SPECIFICATIONS MX5100 Model Model V2403-M-TE3 Type E-TVCS Indirect injection, water-cooled diesel No. of cylinders / Aspiration 4 / Turbocharged Total displacement 2.434 L (148.6 cu.in.) 87 × 102.4 mm (3.4 × 4.0 in.) Bore and stroke Engine Net power 37.3 kW (50 HP)*...
Page 11 MX5100, WSM TRAVELLING SPEEDS TRAVELLING SPEEDS Model MX5100 Tire size (Rear) 14.9-26 Range gear shift Main gear shift km/h (mph) lever lever 1.6 (1.0) 2.2 (1.4) 3.6 (2.3) 5.4 (3.3) Forward 7.6 (4.7) 10.8 (6.7) High 17.5 (10.9) 25.9 (16.0) 1.5 (0.9)
Page 12 MX5100, WSM DIMENSIONS DIMENSIONS...
Page 13 MX5100, WSM DIMENSIONS...
Page 14 MX5100, WSM DIMENSIONS...
Page 15 GENERAL...
Page 17: Table Of Contents
GENERAL CONTENTS 1. TRACTOR IDENTIFICATION ................. G-1 [1] MODEL NAME AND SERIAL NUMBER ..........G-1 [2] CYLINDER NUMBER ................G-2 2. GENERAL PRECAUTIONS ................G-3 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING .. G-4 [1] WIRING ..................... G-4 [2] BATTERY....................G-6 [3] FUSE......................
Page 19: Tractor Identification
MX5100, WSM G GENERAL 1. TRACTOR IDENTIFICATION [1] MODEL NAME AND SERIAL NUMBER When you contact local KUBOTA distributor, always specify the engine serial number, the tractor serial number and hour meter reading. (1) Tractor Identification Plate (3) Engine Serial Number...
Page 20: Cylinder Number
MX5100, WSM G GENERAL [2] CYLINDER NUMBER The cylinder numbers of KUBOTA diesel engine is designated as shown in the figure. The sequence of cylinder numbers is given as No.1, No.2, No.3 and No.4 starting from the front cover side.
Page 21: General Precautions
Screws, bolts and nuts should be installed in their original position to prevent reassembly errors. • When special tools are required, use KUBOTA genuine special tools. Special tools which are not frequently used should be made according to the drawings provided.
Page 22: Handling Precautions For Electrical Parts And Wiring
MX5100, WSM G GENERAL 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING To ensure safety and prevent damage to the machine and surrounding equipment, heed the following precautions in handling electrical parts and wiring. IMPORTANT • Check electrical wiring damage loosened connection every year.
Page 23 MX5100, WSM G GENERAL • Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp • Wind Clamp Spirally (4) Welding Dent (2) Wire Harness W10114580 • Clamp wiring so that there is no twist, unnecessary sag, or excessive tension, except for movable part, where sag be required.
Page 24: Battery
MX5100, WSM G GENERAL [2] BATTERY • Take care not to confuse positive and negative terminal posts. • When removing battery cables, disconnect negative cable first. When installing battery cables, check for polarity and connect positive cable first. • Do not install any battery with capacity other than is specified (Ah).
Page 25: Handling Of Circuit Tester
MX5100, WSM G GENERAL • Use sandpaper to remove rust from terminals. • Repair deformed terminal. Make certain there is no terminal being exposed or displaced. (1) Exposed Terminal (3) Sandpaper (2) Deformed Terminal (4) Rust W10123460 • Make certain that there is no female connector being too open.
Page 26: Lubricants, Fuel And Coolant
0 to 25 °C (32 to 77 °F): SAE20, 10W-30 or 7.0 Imp.qts 15W-40 Above 25 °C (77 °F): SAE30, 10W-30 or 15W-40 44.0 L KUBOTA UDT fluid or KUBOTA SUPER UDT Transmission case 11.6 U.S.gals fluid* 9.7 Imp.gals 9.0 L...
Page 27 • The oil used to lubricate the transmission is also used as hydraulic fluid. To insure proper operation of the hydraulic system and to complete lubrication of the transmission, it is important that a multi-grade transmission fluid is used in this system. We recommended the use of KUBOTA UDT or SUPER UDT fluid for optimum protection and performance.
Page 28: Tightening Torques
MX5100, WSM G GENERAL 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Screws, bolts, and nuts whose tightening torques are not specified in this Workshop Manual should be tightened according to the table below. Indication on top of...
Page 29: Metric Screws, Bolts And Nuts
MX5100, WSM G GENERAL [3] METRIC SCREWS, BOLTS AND NUTS Property class 8.8 Property class 10.9 Grade Unit Nominal N·m kgf·m lbf·ft N·m kgf·m lbf·ft Diameter 24 to 27 2.4 to 2.8 18 to 20 30 to 34 3.0 to 3.5...
Page 30: Maintenance
MX5100, WSM G GENERAL 6. MAINTENANCE Indication on hour meter Refer- Inter- Impor- Item ence 50 100 150 200 250 300 350 400 450 500 550 600 650 700 tant page every Greasing – G-21 50 Hr every Engine start system...
Page 31 • *4 : 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 32: Check And Maintenance
MX5100, WSM G GENERAL 7. CHECK AND MAINTENANCE CAUTION • Be sure to check and service the tractor on a flat place with engine shut off, and apply the parking brake on and chock the wheels. [1] DAILY CHECK To prevent trouble from occurring, it is important to know the condition of the tractor. Check the following items before starting.
Page 33 MX5100, WSM G GENERAL Checking Engine Oil Level CAUTION • Be sure to stop the engine before checking the oil level. 1. Park the machine on a flat surface. 2. Check engine oil before starting the engine or 5 minutes or more after the engine has stopped.
Page 34 MX5100, WSM G GENERAL Cleaning Front Grille and Radiator Screen CAUTION • Be sure to stop the engine before removing the screen. 1. Fully turn the steering handle clockwise. 2. Check front grille to be sure it is clean from debris.
Page 35 MX5100, WSM G GENERAL Checking Head Lights, Hazard Lights, Turn Signal Lights and Tail Lights 1. Inspect the lights for broken bulbs and lenses of the lights. 2. Replace it if it is broken. (1) Head Light (3) Tail Light...
Page 36 MX5100, WSM G GENERAL Checking Seat Belt and ROPS 1. Always check condition of seat belt (1) and ROPS (2) attaching hardware before operating tractor. 2. Replace it if it is damaged. (1) Seat Belt (2) ROPS W10729850 G-18...
Page 37: Check Points Of Initial 50 Hours
MX5100, WSM G GENERAL [2] CHECK POINTS OF INITIAL 50 HOURS Adjusting Clutch Pedal Free Play 1. Stop the engine and remove the key. 2. Slightly depress the clutch pedal and measure free travel at top of pedal stroke. 3. If adjustment is needed, loosen the lock nut, remove the cotter...
Page 38 IMPORTANT • To prevent serious damage to the hydraulic system. Use only a KUBOTA genuine filter. • Do not operate the tractor immediately after changing the transmission fluid. Run the engine at medium speed for a few minutes to prevent damage to the transmission.
Page 39: Check Points Of Every 50 Hours
MX5100, WSM G GENERAL [3] CHECK POINTS OF EVERY 50 HOURS Lubricating Grease Fittings 1. Apply a small amount of multi-purpose grease to the following positions shown in the figures. NOTE • Apply a small amount of multipurpose grease to the following points every 50 hours.
Page 40 MX5100, WSM G GENERAL Checking Engine Start System CAUTION • 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. 1. Place all control levers in the “NEUTRAL” position.
Page 41: Check Points Of Every 100 Hours
MX5100, WSM G GENERAL [4] CHECK POINTS OF EVERY 100 HOURS Checking Battery Condition DANGER • Do not use or charge the refillable type battery if the fluid level is below the LOWER (lower limit level) mark. Otherwise, the battery component parts may prematurely deteriorate, which may shorten the battery’s service life or...
Page 42 MX5100, WSM G GENERAL Checking Battery Condition (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 43 MX5100, WSM G GENERAL Adjusting Fan Belt Tension CAUTION • Be sure to stop the engine before checking and adjusting the belt tension. 1. Stop the engine and remove the key. 2. Apply moderate thumb pressure to belt between pulleys.
Page 44 MX5100, WSM G GENERAL Cleaning Fuel Filter Element This job should not be done in the field, but in a clean place. 1. Close the fuel filter cock (1). 2. Unscrew the screw ring (6) and remove the filter bowl (2), and rinse the inside with kerosene.
Page 45 MX5100, WSM G GENERAL Checking Fuel Line CAUTION • Stop the engine when attempting the check and change prescribed below. • Remember to check the fuel line periodically. The fuel line is subject to wear and aging, fuel may leak out onto the running engine, causing a fire.
Page 46: Check Points Of Every 200 Hours
MX5100, WSM G GENERAL [5] CHECK POINTS OF EVERY 200 HOURS Changing Engine Oil CAUTION • Be sure to stop the engine before changing the oil. • Allow engine to cool down sufficiently, oil can be hot and can burn.
Page 47 MX5100, WSM G GENERAL Adjusting Toe-in 1. Park the tractor on a flat place. 2. Turn steering wheel so front wheels are in the straight ahead position. 3. Lower the implement, lock the park brake and stop the engine. 4. Measure distance between tire beads at front of tire, hub height.
Page 48 MX5100, WSM G GENERAL Checking Radiator Hose and Hose Clamp Check to see if radiator hoses are properly fixed every 200 hours of operation or six months, whichever comes first. 1. If hose clamps are loose or water leaks, tighten bands securely.
Page 49: Check Points Of Every 400 Hours
IMPORTANT • To prevent serious damage to the hydraulic system. Use only a KUBOTA genuine filter. • Do not operate the tractor immediately after changing the transmission fluid. Run the engine at medium speed for a few minutes to prevent damage to the transmission.
Page 50: Check Point Of Every 600 Hours
MX5100, WSM G GENERAL Greasing Front Wheel Hub (2WD) 1. Detach the cover, and apply bearing grease. (1) Front Wheel Hub Cover (2WD) W10358080 Replacing Fuel Filter Element 1. See “Cleaning Fuel Filter Element” in “CHECK POINTS OF EVERY 100 HOURS”.
Page 51: Check Point Of Every 800 Hours
MX5100, WSM G GENERAL [8] CHECK POINT OF EVERY 800 HOURS Checking Valve Clearance IMPORTANT • Valve clearance must be checked and adjusted when engine is cold. 1. Remove the head cover. 2. Align the “1TC” mark line (3) on the flywheel and projection (2) on the housing so that the No.1 piston comes to the compression...
Page 52: Check Point Of Every 1500 Hours
MX5100, WSM G GENERAL [9] CHECK POINT OF EVERY 1500 HOURS Checking Fuel Injection Nozzle Injection Pressure CAUTION • Check the nozzle injection pressure and condition after confirming that there is nobody standing in the direction of the injected fuel.
Page 53 MX5100, WSM G GENERAL Valve Seat 1. Set the injection nozzle to a nozzle tester (Code No. 07909- 31361). 2. Raise the fuel pressure, and keep at 12.75 MPa (130 kgf/cm 1849 psi) for 10 seconds. 3. If any fuel leak is found, replace the nozzle piece.
Page 54: Check Points Of Every 3000 Hours
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. (Fuel Tightness of Delivery Valve) 1.
Page 55 MX5100, WSM G GENERAL Checking Turbocharger NOTE • The turbocharger component parts are not adapted. When the part is defective, replace the turbocharger as an assembly. • Exhaust gas leak, carbon or engine oil leak are found, replace the turbocharger with a new one.
Page 56: Check Point Of Every 1 Year
MX5100, WSM G GENERAL [11] CHECK POINT OF EVERY 1 YEAR Replacing Air Cleaner Primary Element and Secondary Element 1. Remove the air cleaner cover (3). 2. Replace the air cleaner primary element and the secondary element. NOTE • Check to see if the evacuator valve is blocked with dust.
Page 57 MX5100, WSM G GENERAL Flushing Cooling System and Changing Coolant (Continued) Anti-Freeze CAUTION • When using antifreeze, put on some protection such as rubber gloves (Antifreeze contains poison.). • If should drink antifreeze, throw up at once and take medical attention.
Page 58 The LLC contains anticorrosive agent. If mixed with the cleaning agent, sludge may build up, adversely affecting the engine parts. 7. Kubota’s genuine ling-life coolant has a service life of 2 years. Be sure to change the coolant every 2 years. NOTE •...
Page 59: Others
MX5100, WSM G GENERAL [13] OTHERS Bleeding Fuel System IMPORTANT • Air must be removed : - When the fuel filter or lines are removed. - When tank is completely empty. - After the tractor has not been used for a long period of time.
Page 60 MX5100, WSM G GENERAL 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 61: Special Tools
MX5100, WSM G GENERAL 8. SPECIAL TOOLS [1] SPECIAL TOOLS FOR ENGINE Special Use Puller Set Code No.: 07916-09032 Application: Use exclusively for pulling out bearing, gears and other parts with ease. W10240500 Piston Ring Compressor Code No.: 07909-32111 Application: Use exclusively for pushing in the piston with piston rings into the cylinder.
Page 62 MX5100, WSM G GENERAL Oil Pressure Tester Code No.: 07916-32032 Application: Use to measure lubricating oil pressure. (1) Gauge (5) Adaptor 2 (2) Cable (6) Adaptor 3 (3) Threaded Joint (7) Adaptor 4 (4) Adaptor 1 (8) Adaptor 5 W10243180 Valve Seat Cutter Code No.:...
Page 63 MX5100, WSM G GENERAL Plastigage Code No.: 07909-30241 Application: Use to check the oil clearance between crankshaft and bearing, etc. Measuring: Green ..0.025 to 0.076 mm (0.001 to 0.003 in.) range Red ..0.051 to 0.152 mm (0.002 to 0.006 in.) Blue ..
Page 64 MX5100, WSM G GENERAL NOTE • The following special tools are not provided, so make them referring to the figure. Valve Guide Replacing Tool Application: Use to press out and press fit the valve guide. 20 mm dia. (0.79 in. dia.) 11.7 to 11.9 mm dia.
Page 65 MX5100, WSM G GENERAL Crankshaft Bearing 1 Replacing Tool Application: Use to press out and press fit the crankshaft bearing 1. 1. Extracting tool 135 mm (5.31 in.) 72 mm (2.83 in.) R40 mm (R1.57 in.) 10 mm (0.39 in.) 20 mm (0.79 in.)
Page 66 MX5100, WSM G GENERAL Balancer Metal Replacing Tool (for Removing) Application: Use to remove the metal bearing. 25 mm (0.98 in. dia.) 41.934 to 41.950 mm dia. (1.6509 to 1.6516 in. dia.) 10 mm (0.39 in.) 24.959 to 24.980 mm dia. (0.9826 to 0.9835 in. dia.) Chamfer 0.3 mm (0.01 in.)
Page 67 MX5100, WSM G GENERAL Balancer Metal Replacing Tool (for Fitting) Application: Use to press fit the metal bearing. 0.52 rad (30 °) 5 mm (0.20 in.) 10 mm (0.39 in.) 3.3 to 3.7 mm (0.130 to 0.146 in.) Chamfer 0.3 mm (0.01 in.) 43.934 to 43.950 mm dia.
Page 68 MX5100, WSM G GENERAL Engine Hook 1 Application: Use for hooking the V2403-M-T engine. Use this engine hook 1 with the engine hook 2. 17 mm (0.67 in.) 9 mm (0.35 in.) 129 mm (5.08 in.) 10.8 to 11.2 mm (0.426 to 0.440 in.) 40 mm (1.6 in.)
Page 69 MX5100, WSM G GENERAL Engine Hook 2 Application: Use for hooking the V2403-M-T engine. Use this engine hook 2 with the engine hook 1. 217 mm (8.54 in.) 140 mm (5.51 in.) 49 mm (1.9 in.) 44 mm (1.7 in.) 20 mm Hole (0.79 in.
Page 70: Special Tools For Tractor
MX5100, WSM G GENERAL [2] SPECIAL TOOLS FOR TRACTOR Tie-rod End Lifter Code No.: 07909-39051 Application: Use for removing the tie-rod end with ease. W10264720 Steering Wheel Puller Code No.: 07916-51090 Application: Use for removing the steering wheel without damaging the steering shaft.
Page 71 MX5100, WSM G GENERAL Relief Valve Pressure Tester Code No.: 07916-50045 Application: This allows easy measurement of relief set pressure. (1) Gauge (07916-50322) (6) Adaptor C (PS3/8) (07916-50371) (2) Cable (07916-50331) (7) Adaptor D (PT1/8) (07916-50381) (3) Threaded Joint (07916-50401)
Page 72 MX5100, WSM G GENERAL Rear Axle Nut Wrench 71 Code No.: 07916-52531 Application: Use for removing and installing a rear axle nut. W10446460 Relief Valve Setting Pressure Adaptor G Code No.: 07916-52751 Application: This offers easy measurement of relief valve setting pressure from the hydraulic coupler.
Page 73 MX5100, WSM G GENERAL Hydraulic Arm Shaft Bushing Press-Fitting Tool Application: Use for replacing the hydraulic arm shaft bushings in the hydraulic cylinder body. Right Left 54.7 to 54.9 mm 49.7 to 49.9 mm (2.1535 to 2.1614 in.) (1.9567 to 1.9646 in.) 24.5 to 25.5 mm...
Page 74 MX5100, WSM G GENERAL Clutch Center Tool Application: Use for removing and installing the clutch assembly. 18.8 mm dia. (0.74 in. dia.) 31.7 mm dia. (1.25 in. dia.) 25.0 mm dia. (0.98 in. dia.) 50.0 mm (1.97 in.) 26.0 mm (1.02 in.) 200.0 mm (7.87 in.)
Page 75 MX5100, WSM G GENERAL Threaded Joint Code No.: 07916-50341 Application: Use for measuring PTO clutch operating pressure. 10 mm (0.39 in.) 16.2 mm (0.64 in.) PS 1/4 M16 × 1.5 49 mm (1.93 in.) 37 mm (1.46 in.) 18 mm dia. (0.71 in. dia.)
Page 76 MX5100, WSM G GENERAL Cylinder Safety Valve Setting Pressure Adaptor Application: Use for setting the safety valve to the nozzle tester to measure cracking pressure and check oil tightness of the safety valves. 45 mm (1.77 in.) 10 mm dia. (0.39 in. dia.) 40 mm (1.58 in.)
Page 77: Tires
MX5100, WSM G GENERAL 9. TIRES [1] TYPES OF TIRE The following tires can be mounted. Farm tire Farm Tire Turf Tire Industrial Tire (Front Tire of 2WD only) W10522100 Type of tire Front Rear Farm Tire 7.5L – 15, 6PR or 9.5L–15, 6PR 13.6 –...
Page 78: Treads Adjustment
MX5100, WSM G GENERAL [2] TREADS ADJUSTMENT (1) Front Wheels (A) 2WD Type With 2WD models, the front tread can be adjusted in 4 steps. Models 7.5L-15 1280 mm (50.4 in.) 1380 mm (54.3 in.) 1480 mm (58.3 in.) 1580 mm (62.2 in.) Farm 9.5L-15...
Page 79: Rear Wheels
MX5100, WSM G GENERAL (2) Rear Wheels Rear tread can be adjusted in 5 steps depending on the model. To change the tread 1. Remove the wheel rim and / or disk mounting bolts. 2. Change the position of the rim and / or disk (ring and left) to the desired position, and tighten the bolts.
Page 80: Wheel Hub
MX5100, WSM G GENERAL (3) Wheel Hub Front wheel hub Rear wheel hub 152.4 mm 203.2 mm Screw circle diameter (A) (6 in.) (8.0 in.) Number of screws M14 × 1.5 M16 × 1.5 Screws 117.4 mm 152.4 mm Hub pilot diameter (B) (4.625 in.)
Page 81: Tire Pressure
MX5100, WSM G GENERAL [3] TIRE PRESSURE IMPORTANT • Do not use tires other than those approved by LUBOTA Inflation Pressure Though the tire pressure is factory-set to the prescribed level, it naturally drops slowly in the course of time. Thus, check it everyday and inflate as necessary.
Page 82: Tire Liquid Injection
MX5100, WSM G GENERAL [4] TIRE LIQUID INJECTION Auxiliary weights can be used to increase traction force for plowing in fields or clayey ground. Another way is to inject water or another liquid, such as a calcium chloride solution in the tires. Water must not be used in winter since it freezes at 0 °C (32 °F).
Page 83 MX5100, WSM G GENERAL Injection CAUTION • When a calcium chloride solution is used, cool it before pouring it into the tire. • Do not fill tires with water or solution more than 75 % of full capacity (to the valve stem level).
Page 84 MX5100, WSM G GENERAL Draining Water or Solution 1. Lift the rear tires off the ground. 2. Turn the tire so that the air valve is at the bottom. 3. Remove the air valve, and drain liquid (liquid can only be drained to the level of the valve and liquid under that level remains inside).
Page 85: Implement Limitations
KUBOTA. Use with implements 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 86 MX5100, WSM G GENERAL Implement Remarks MX5100 Max.Load Capacity 3500 kg (7700 lbs) Trailer Max. Drawbar Load 750 kg (1650 lbs) Max. Cutting Width 2130 mm (84 in.) Rotary-Cutter Max.Weight 450 kg (1000 lbs) Max. Cutting Width 1830 mm (72 in.)
Page 87 ENGINE...
Page 89 MECHANISM NOTICE Regarding engine mechanism information, please refer to Workshop Manual DIESEL ENGINE, MECHANISM (Code No. 9Y021-01874).
Page 91 SERVICING CONTENTS 1. TROUBLESHOOTING ..................1-S1 2. SERVICING SPECIFICATIONS ..............1-S5 3. TIGHTENING TORQUES ................1-S13 4. CHECKING, DISASSEMBLING AND SERVICING........1-S15 [1] CHECKING AND ADJUSTING .............1-S15 (1) Engine Body..................1-S15 (2) Lubricating System ................1-S17 (3) Cooling System.................1-S17 (4) Fuel System ..................1-S19 [2] DISASSEMBLING AND ASSEMBLING..........1-S23 (1) Separating Engine from Tractor ............1-S23 (2) Engine External Components ............1-S35 (3) Cylinder Head and Valves ..............1-S38...
Page 93: Troubleshooting
MX5100, WSM ENGINE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Engine Does Not No fuel Replenish fuel G-14 Start Air in the fuel system Vent air G-41 Water in the fuel system Change fuel and – repair or replace fuel...
Page 94 MX5100, WSM ENGINE Reference Symptom Probable Cause Solution Page Engine Revolution Is Fuel filter clogged or dirty Replace G-32 Not Smooth Air cleaner clogged Clean or replace G-26 Fuel leak due to loose injection pipe retaining nut Tighten retaining nut...
Page 95 MX5100, WSM ENGINE Reference Symptom Probable Cause Solution Page Deficient Output Incorrect injection timing Adjust 1-S19 Engine’s moving parts seem to be seizing Repair or replace – Injection pump malfunctioning Replace 1-S43 Deficient nozzle injection Repair or replace 1-S22 nozzle...
Page 96 MX5100, WSM ENGINE Reference Symptom Probable Cause Solution Page Low Oil Pressure Engine oil insufficient Replenish Oil strainer clogged Clean 1-S49 Relief valve stuck with dirt Clean – Relief valve spring weaken or broken Replace – Excessive oil clearance of crankshaft bearing...
Page 97: Servicing Specifications
MX5100, WSM ENGINE 2. SERVICING SPECIFICATIONS ENGINE BODY Item Factory Specification Allowable Limit Valve Clearance (When Cold) 0.18 to 0.22 mm – 0.0071 to 0.0086 in. Compression Pressure 3.24 to 3.72 MPa / 2.55 MPa / (When Cranking with Starting Motor)
Page 98 MX5100, WSM ENGINE ENGINE BODY (Continued) Item Factory Specification Allowable Limit Valve Timing (Exhaust Valve) Open 0.87 rad (50 °) – before B.D.C. Close 0 rad (0 °) – after T.D.C. Valve Spring Free Length 41.7 to 42.2 mm 41.2 mm 1.65 to 1.66 in.
Page 99 MX5100, WSM ENGINE ENGINE BODY (Continued) Item Factory Specification Allowable Limit Timing Gear Crank Gear to Idle Gear Backlash 0.04150 to 0.1122 mm 0.15 mm 0.001634 to 0.004417 0.0059 in. Idle Gear to Cam Gear Backlash 0.04150 to 0.1154 mm 0.15 mm...
Page 100 MX5100, WSM ENGINE ENGINE BODY (Continued) Item Factory Specification Allowable Limit Idle Gear Side Clearance 0.12 to 0.48 mm 0.9 mm 0.0048 to 0.018 in. 0.04 in. Idle Gear Shaft to Idle Gear Bushing Oil Clearance 0.025 to 0.066 mm 0.10 mm...
Page 101 MX5100, WSM ENGINE ENGINE BODY (Continued) Item Factory Specification Allowable Limit Balancer Shaft Journal 1 to Balancer Shaft Oil Clearance 0.0300 to 0.111 mm 0.20 mm Bearing 1 0.00119 to 0.00437 in. 0.0079 in. Balancer Shaft Journal 1 O.D. 43.934 to 43.950 mm –...
Page 102 MX5100, WSM ENGINE ENGINE BODY (Continued) Item Factory Specification Allowable Limit Crankshaft Journal to Crankshaft Bearing Oil Clearance 0.0400 to 0.118 mm 0.20 mm 0.00158 to 0.00464 in. 0.0079 in. Crankshaft Journal O.D. 59.921 to 59.940 mm – 2.3591 to 2.3598 in.
Page 103 MX5100, WSM ENGINE LUBRICATING SYSTEM Item Factory Specification Allowable Limit Engine Oil Pressure At Idle Speed More than 98 kPa 50 kPa 1.0 kgf/cm 0.5 kgf/cm 14 psi 7 psi At Rated Speed 300 to 440 kPa 250 kPa 3.0 to 4.5 kgf/cm 2.5 kgf/cm...
Page 104 MX5100, WSM ENGINE FUEL SYSTEM Item Factory Specification Allowable Limit Injection Pump Injection Timing 0.132 to 0.157 rad – (7.55 to 9.05 °) before T.D.C. Pump Element Fuel Tightness – 13.73 MPa 140.0 kgf/cm 1991 psi Delivery Valve Fuel Tightness...
Page 105: Tightening Torques
MX5100, WSM ENGINE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-10, G-11.) [TRACTOR BODY] Item N·m kgf·m lbf·ft Start B terminal mounting nut 7.8 to 9.8...
Page 106 MX5100, WSM ENGINE [ENGINE BODY] Item Size x Pitch N·m kgf·m lbf·ft Cylinder head cover screw M6 x 1.0 9.81 to 11.2 1.00 to 1.15 7.24 to 8.31 *Cylinder head screw M11 x 1.25 93.2 to 98.0 9.50 to 10.0 68.8 to 72.3...
Page 107: Checking, Disassembling And Servicing
MX5100, WSM ENGINE 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 and disconnect the 2P connector from the stop solenoid in order not to inject fuel.
Page 108 MX5100, WSM ENGINE Valve Clearance IMPORTANT • Valve clearance must be checked and adjusted when engine is cold. 1. Remove the head cover. 2. Align the “1TC” mark line (3) on the flywheel and projection (2) on the housing so that the No.1 piston comes to the compression or overlap top dead center.
Page 109: Lubricating System
MX5100, WSM ENGINE (2) Lubricating System Engine Oil Pressure 1. Remove the engine oil pressure switch, and set an oil pressure tester (Code No.: 07916-32032). (Adaptor screw size : PT 1/8) 2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds.
Page 110 MX5100, WSM ENGINE Radiator Cap Air Leakage 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. 1. Set a radiator tester and an adaptor on the radiator cap.
Page 111: Fuel System
MX5100, WSM ENGINE (4) Fuel System Injection Timing 1. Remove the stop solenoid. 2. Remove the injection pipes and nozzle. 3. Set the speed control lever to maximum fuel discharge position. (Reference) • Turn the flywheel with screwdriver. 4. Turn the flywheel counterclockwise (facing the flywheel) until the fuel fills up to the hole of the delivery valve holder for 1st cylinder.
Page 112 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 113 (DI : 18.63 to 17.65 MPa (190.0 to 180.0 kgf/cm , 2702 to 2560 psi)). 9. If the measurement is less than allowable limit, replace the pump with new one or repair with a Kubota-authorized pump service shop. 10 seconds 13.73 → 12.75 MPa Factory spec.
Page 114 MX5100, WSM ENGINE Fuel Injection Pressure 1. Set the injection nozzle to a nozzle tester. 2. Slowly move the tester handle to measure the pressure at which fuel begins jetting out from the nozzle. 3. If the measurement is not within the factory specifications, replace the adjusting washer (1) in the nozzle holder to adjust it.
Page 115: Disassembling And Assembling
MX5100, WSM ENGINE [2] DISASSEMBLING AND ASSEMBLING (1) Separating Engine from Tractor 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 plugs (1) to drain oil.
Page 116 Transmission fluid capacity 11.6 U.S.gals 9.7 lmp.gals IMPORTANT • Use only KUBOTA SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system. Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page G-8.) • Do not mix different brands of fluid together.
Page 117 MX5100, WSM ENGINE Bonnet and Battery Negative Cable 1. To open the bonnet (1), hold the bonnet (1) with a hand and pull the release lever (2) and open the bonnet (1). 2. Disconnect the battery negative cable (3). 3. Disconnect the head light connector (6).
Page 118 MX5100, WSM ENGINE Draining Coolant CAUTION • Do not remove radiator cap while coolant is hot. When cool, slowly rotate cap to the first stop and allow sufficient time for excess pressure to escape before removing the cap completely. 1. Stop the engine and let cool down.
Page 119 MX5100, WSM ENGINE Disconnecting Wirings 2 1. Remove the seat (1). 2. Disconnect the 4P rear combination lamp connector (2) and the hazard lamp leads (3). 3. Disconnect the 2P connectors (4) from the PTO lever neutral switch. 4. Disconnect the 3P connector (7) from the seat switch (6).
Page 120 MX5100, WSM ENGINE Steering Wheel, Meter Panel and Rear Bonnet 1. Remove the steering wheel cap. 2. Remove the steering wheel mounting nut and remove the steering wheel (1) with a steering wheel puller. 3. Remove the accelerator lever grip (4).
Page 121 MX5100, WSM ENGINE Disconnecting Wirings 3 1. After removing the floor seat cover, disconnect the code bands (1) (2) (3) (6). 2. Disconnect the wiring from the transmission housing case. (When reassembling) • Bind the code bands as shown in the pictures.
Page 122 MX5100, WSM ENGINE Disconnecting Steering Hoses 1. Before disconnect the steering hoses (1) (2) (3) (4), bind the same color tapes to the steering hoses (1) (2) (3) (4) and to the joints of the power steering controller (5). 2. Disconnect the steering hoses (1) (2) (3) (4) from the steering controller (5).
Page 123 MX5100, WSM ENGINE Removing Steering Support Plates, Accelerating Wire and Clutch Rod 1. Removing the steering support plates (1), (4). 2. Remove the snap pin (2) and disconnect the accelerating wire (3). 3. Remove the split pin (6) from the clutch rod (5). Disconnect the clutch rod (5) from the clutch lever.
Page 124 MX5100, WSM ENGINE Disconnecting Front Wheel Drive Shaft Coupling (4WD Model Only) 1. Remove the propeller shaft cover mounting bolts (M5) (7). 2. Slide the propeller shaft cover (4), (8). 3. Remove the spring pin (2). 4. Disconnect the coupling (1) from the front axle drive shaft.
Page 125 MX5100, WSM ENGINE Removing Muffler, Fuel Tank, Fuel Tank Stay and Wiring Harness 1. Remove the muffler (1). 2. Remove the exhaust manifold cover (7). 3. Remove the fuel tank stay mounting bolts (8) (9) (10). 4. Disconnect the radiator hose (11) from the engine. Disconnect the inlet hose (4) from the turbocharger.
Page 126 MX5100, WSM ENGINE Location of Engine Hooks 1. Remove the original engine hook from the cylinder head rear end. 2. Install the engine hook (2) using original bolt (M8). 3. Install the engine hook (1) under the turbocharger waste gate valve.
Page 127: Engine External Components
MX5100, WSM ENGINE (2) Engine External Components Removing Engine Outer Parts 1. Remove the tank stay (1). 2. Remove the fan belt protection cover (2). 3. Remove the accelerating wire (5) and the oil filter (6). 4. Check oil leakage from the turbocharger (7).
Page 128 MX5100, WSM ENGINE Clutch Assembly 1. Remove the clutch from the flywheel. (When reassembling) • Direct the shorter end of the clutch disc boss toward the flywheel. • Apply molybdenum disulfide (Three Bond 1901 or equivalent) to the splines of clutch disc boss.
Page 129 MX5100, WSM ENGINE Turbocharger CAUTION • While the engine is running and or just after it stops, the turbocharger is hot, be careful not to touch the turbocharger. NOTE • When detaching and attaching the turbocharger assembly, be very careful not to allow dust, dirt and other foreign matters in the oil pipes.
Page 130: Cylinder Head And Valves
MX5100, WSM ENGINE (3) Cylinder Head and Valves Cylinder Head Cover 1. Remove the lead (4). 2. Remove the breather hose (1). 3. Remove the head cover screws (3). 4. Remove the cylinder head cover (2). (When reassembling) • Check to see if the cylinder head cover gasket (5) is not defective.
Page 131 MX5100, WSM ENGINE Nozzle Holder Assembly and Glow Plug 1. Remove the overflow pipe assembly (3). 2. Remove the nozzle holder assemblies (4) using a 21 mm deep socket wrench. 3. Remove the copper gasket and heat seal (5). 4. Remove the glow plugs (2).
Page 132 MX5100, WSM ENGINE Rocker Arm and Push Rod 1. Remove the rocker arm bracket screws. 2. Detach the rocker arm assembly (1). 3. Remove the push rods (2). (When reassembling) • When putting the push rods (2) onto the tappets (3), check to see if their ends are properly engaged with the grooves.
Page 133 MX5100, WSM ENGINE Cylinder Head 1. Loosen the pipe clamp (2), and remove the water return pipe (1). 2. Remove the cylinder head screw in the order of (n or r) to (a). 3. Lift up the cylinder head (3) to detach.
Page 134 MX5100, WSM ENGINE Tappets 1. Remove the tappets (1) from the crankcase. (When reassembling) • Visually check the contact between tappets and cams for proper rotation. If defect is found, replace tappets. • Before installing the tappets, apply engine oil thinly around them.
Page 135 (5). IMPORTANT • If you replace new boost compensator, it is necessary to adjust it. Get the adjustment procedure from KUBOTA. 45 to 49 N·m Tightening torque Hi-idling body 4.5 to 5.0 kgf·m 33 to 36 lbf·ft...
Page 136 MX5100, WSM ENGINE Governor Springs and Speed Control Plate NOTE • Specific tool (1) : 1.2 mm diameter hard wire with its end hooked, overall length 200 mm (7.87 in.). The tip of wire is bent like the hook to hang governor springs.
Page 137 MX5100, WSM ENGINE Governor Springs and Speed Control Plate (Continued) (When reassembling) • Hook the small spring (4) first and then the large governor spring (3) on the speed control plate (6). • Put the specific tool (1) from the injection pump side to catch the large governor spring (3).
Page 138 MX5100, WSM ENGINE Fan Drive Pulley 1. Lock the flywheel not to turn using the flywheel stopper. 2. Remove the fan drive pulley mounting nut (1) using 46 mm deep socket wrench (3). 3. Remove the fan drive pulley (2) with gear puller (4).
Page 139 MX5100, WSM ENGINE Idle Gear 1. Remove the external snap ring. 2. Detach the idle gear collar. 3. Detach the idle gear (2). (When reassembling) • Check to see each gear is aligned with its aligning mark: - Idle gear (2) and crank gear (6), cam gear (3) and balancer...
Page 140 MX5100, WSM ENGINE Fuel Camshaft and Fork Lever Assembly 1. Remove the fuel feed pump. 2. Detach the fuel camshaft stopper (1). 3. Remove the three fork lever holder mounting screws (2). 4. Draw out the fuel camshaft assembly (5), (6) and fork lever assembly (3), (4), (7) at the same time.
Page 141: Piston And Connecting Rod
MX5100, WSM ENGINE (4) Piston and Connecting Rod Oil Pan and Oil Strainer 1. Remove the oil pan mounting screws. 2. Remove the oil pan (3) by lightly tapping the rim of the pan with a wooden hammer. 3. Remove the oil pan gasket (2).
Page 142 MX5100, WSM ENGINE Pistons 1. Completely clean carbon (1) in the cylinders. 2. Remove the connecting rod cap (3). 3. Turn the flywheel and bring the piston to top dead center. 4. Draw out the piston upward by lightly tapping it from the bottom of the crankcase with the grip of a hammer.
Page 143 MX5100, WSM ENGINE Piston Ring and Connecting Rod 1. Remove the piston rings (1), (2), (3) using a piston ring tool. 2. Remove the piston pin (9), and separate the connecting rod (7) from the piston (6). (When reassembling) • When installing the rings, assemble the rings so that the manufacturer’s mark (12) near the gap faces the top of the piston...
Page 144: Flywheel And Crankshaft
MX5100, WSM ENGINE (5) Flywheel and Crankshaft Flywheel 1. Fit the stopper to the flywheel (1). 2. At first, remove two pieces of the flywheel screws (2). 3. Insert two pieces of the flywheel guide screws (3) in the holes.
Page 145 MX5100, WSM ENGINE Crankshaft NOTE • Before disassembling, check the side clearance of crankshaft. Also check it during reassembling. 1. Remove the main bearing case screw 2 (1). 2. Turn the crankshaft to set the crank pin of the 4th cylinder to the horizontal directions (Right or Left).
Page 146 MX5100, WSM ENGINE Main Bearing Case Assembly 1. Remove the two main bearing case screws 1 (7), and remove the main bearing case assembly being careful with thrust bearing and crankshaft bearing. 2. Remove the main bearing case 1, 2 as above.
Page 147: Servicing
MX5100, WSM ENGINE [3] SERVICING (1) Cylinder Head and Valves Top Clearance 1. Remove the cylinder head. 2. Move the piston up and stick a strip of fuse on the piston head at three position with grease. 3. Lower the piston and install the cylinder head. (Use a new cylinder head gasket and tighten with a specified tightening torque.)
Page 148 MX5100, WSM ENGINE Cylinder Head Flaw 1. Prepare an air spray red check. 2. Clean the surface of the cylinder head with the detergent (2). 3. Spray the cylinder head surface with the red permeative liquid (1). Leave it five to ten minutes after spraying.
Page 149 MX5100, WSM ENGINE Replacing Valve Guide (When removing) 1. Press out the used valve guide using a valve guide replacing tool. (See page “SPECIAL TOOLS”.) (When installing) 1. Clean a new valve guide and valve guide bore, and apply engine oil to them.
Page 150 MX5100, WSM ENGINE 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 MX5100, WSM ENGINE 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 MX5100, WSM ENGINE Push Rod Alignment 1. Place the push rod on V blocks. 2. Measure the push rod alignment. 3. If the measurement exceeds the allowable limit, replace the push rod. 0.25 mm Push rod alignment Allowable limit 0.0098 in.
Page 153: Timing Gears
MX5100, WSM ENGINE (2) Timing Gears 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 154 MX5100, WSM ENGINE Camshaft Side Clearance 1. Set a dial indicator with its tip on the camshaft. 2. Measure the side clearance by moving the cam gear to the front to rear. 3. If the measurement exceeds the allowable limit, replace the camshaft stopper.
Page 155 MX5100, WSM ENGINE Oil Clearance of Camshaft Journal 1. Measure the camshaft journal O.D. with an outside micrometer. 2. Measure the cylinder block bore I.D. for camshaft with a cylinder gauge, and calculate the oil clearance. 3. If the oil clearance exceeds the allowable limit, replace the camshaft.
Page 156 MX5100, WSM ENGINE Balancer Shaft Side Clearance 1. Set a dial indicator with tip on the balancer shaft. 2. Measure the side clearance by moving the balancer shaft to the front and rear. 3. If the measurement exceeds the allowable limit, replace the balancer shaft.
Page 157 MX5100, WSM ENGINE Oil Clearance of Balancer Shaft Journal 1. Measure the balancer shaft journal O.D. with an outside micrometer. 2. Measure the cylinder block bore I.D. for balancer shaft with an inside micrometer or cylinder gauge. 3. If the clearance exceeds the allowable limit, replace the balancer shaft.
Page 158: Piston And Connecting Rod
MX5100, WSM ENGINE (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 MX5100, WSM ENGINE Connecting Rod Alignment NOTE • Since the I.D. of the connecting rod small end bushing is the basis of this check, check bushing for wear beforehand. 1. Install the piston pin into the connecting rod. 2. Install the connecting rod on the connecting rod alignment tool.
Page 160: Crankshaft
MX5100, WSM ENGINE (4) Crankshaft Side Clearance of Crankshaft 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 161 MX5100, WSM ENGINE Oil Clearance between Crankpin and Crankpin Bearing 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigage 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 162 MX5100, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 1. Measure the O.D. of the crankshaft journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate oil clearance.
Page 163 MX5100, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 1. Put a strip of plastigage on the center of the journal. 2. Install the bearing case and tighten the baring case screws 1 to the specified torque, and remove the bearing case again.
Page 164: Cylinder
MX5100, WSM ENGINE Replacing Crankshaft Sleeve 1. Remove the used crankshaft sleeve (3). 2. Set the sleeve guide (2) to the crankshaft (5). 3. Set the stopper (1) to the crankshaft (5) as shown in figure. 4. Heat a new sleeve to a temperature between 150 and 200 °C (302 and 392 °F), and fix the sleeve to the crankshaft (5) as...
Page 165: Oil Pump
MX5100, WSM ENGINE Correcting Cylinder (Oversize) 1. When the cylinder is worn beyond the allowable limit, bore and hone it to the specified dimension. 87.250 to 87.272 mm Factory spec. 3.4351 to 3.4359 in. Oversize cylinder I.D. 87.420 mm Allowable limit 3.4417 in.
Page 166 MX5100, WSM ENGINE 1-S74...
Page 167 CLUTCH...
Page 169 MECHANISM CONTENTS 1. TRAVELLING CLUTCH ................2-M1 [1] LINKAGE MECHANISM................2-M1 2. PTO CLUTCH ....................2-M2 [1] SHIFT LINKAGE ..................2-M2 [2] STRUCTURE ................... 2-M2 [3] OIL FLOW ....................2-M3...
Page 171: Travelling Clutch
MX5100, WSM CLUTCH 1. TRAVELLING CLUTCH [1] LINKAGE MECHANISM This tractor uses hanging type clutch pedal to have wider space about the platform. (1) Flywheel (8) 25T Gear Shaft (2) Pressure Plate (9) 18T PTO Gear Shaft (3) Clutch Cover...
Page 172: Pto Clutch
MX5100, WSM CLUTCH 2. PTO CLUTCH [1] SHIFT LINKAGE The shift lever (1) and the PTO clutch valve (4) are connected by the shift cable (3) as shown in the left figure. When the shift lever is moved to the B side, the PTO clutch valve (4) is set at “ENGAGED”...
Page 173: Oil Flow
MX5100, WSM CLUTCH [3] OIL FLOW The oil adjusted the pressure by the regulator valve flows into the PTO clutch valve (2). When the PTO lever is at the “DISENGAGED” position, the oil does not flow through the PTO clutch valve (2) to the clutch pack.
Page 174 MX5100, WSM CLUTCH 2-M4...
Page 175 SERVICING CONTENTS 1. TROUBLESHOOTING ..................2-S1 2. SERVICING SPECIFICATIONS ..............2-S3 3. TIGHTENING TORQUES ................2-S4 4. CHECKING, DISASSEMBLING AND SERVICING........2-S5 [1] CHECKING AND ADJUSTING ...............2-S5 [2] DISASSEMBLING AND ASSEMBLING..........2-S7 (1) Separating Engine from Clutch Housing..........2-S7 (2) Disassembling Clutch ...............2-S16 (3) Disassembling PTO Clutch ...............2-S18 [3] SERVICING ....................2-S25 (1) Travelling Clutch ................2-S25 (2) Hydraulic PTO Clutch ...............2-S27...
Page 177: Troubleshooting
MX5100, WSM CLUTCH 1. TROUBLESHOOTING TRAVELLING CLUTCH Reference Symptom Probable Cause Solution Page Clutch Drags Clutch pedal free play excessive Adjust 2-S5 Dust on clutch disc generated from clutch disc Remove rust 2-S16 facing Release fork broken Replace 2-S17 Clutch disc or pressure plate warped...
Page 178 MX5100, WSM CLUTCH PTO CLUTCH Reference Symptom Probable Cause Solution Page PTO Clutch Slip Operating pressure is low Adjust 2-S6 PTO clutch valve malfunctioning Repair or replace 2-S20 Clutch disc or drive plate excessively worn Replace 2-S23 Deformation of piston or return plate...
Page 179: Servicing Specifications
MX5100, WSM CLUTCH 2. SERVICING SPECIFICATIONS TRAVELLING CLUTCH Item Factory Specification Allowable Limit Clutch Pedal Free play 20 to 30 mm –- 13/16 to 1-3/16 in. Clutch Stopper Bolt Height 18 to 22 mm – 0.70 to 0.87 in. Clutch Disc Disc Surface to –...
Page 180: Tightening Torques
MX5100, WSM CLUTCH 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-10, G-11.) Item N·m kgf·m lbf·ft Starter’s terminal B mounting nut 7.8 to 9.8...
Page 181: Checking, Disassembling And Servicing
MX5100, WSM CLUTCH 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Checking Clutch Pedal Free Travel 1. Stop the engine and remove the key. 2. Slightly depress the clutch pedal and measure free travel at top of pedal stroke.
Page 182 MX5100, WSM CLUTCH Checking PTO Clutch Operating Pressure 1. Remove the plug (PT 1/8) (4) on the PTO valve spool. 2. Set the adaptor (5) to the PTO valve spool. 3. Set the adaptor, the hydraulic cable and the gauge to the adaptor (4).
Page 183: Disassembling And Assembling
Transmission fluid capacity 11.6 U.S.gals 9.7 lmp.gals IMPORTANT • Use only KUBOTA SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system. Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page G-8.) • Do not mix different brands of fluid together.
Page 184 MX5100, WSM CLUTCH Bonnet and Battery Negative Cable 1. To open the bonnet (1), hold the bonnet (1) with a hand and pull the release lever (2) and open the bonnet (1). 2. Disconnect the battery negative cable (3). 3. Disconnect the head light connector (6).
Page 185 MX5100, WSM CLUTCH Draining Coolant CAUTION • Do not remove radiator cap while coolant is hot. When cool, slowly rotate cap to the first stop and allow sufficient time for excess pressure to escape before removing the cap completely. 1. Stop the engine and let cool down.
Page 186 MX5100, WSM CLUTCH Disconnecting Wirings 2 1. Remove the seat (1). 2. Disconnect the 4P rear combination lamp connector (2) and the hazard lamp leads (3). 3. Disconnect the 2P connectors (4) from the PTO lever neutral switch. 4. Disconnect the 3P connector (7) from the seat switch (6).
Page 187 MX5100, WSM CLUTCH Steering Wheel, Meter Panel and Rear Bonnet 1. Remove the steering wheel cap. 2. Remove the steering wheel mounting nut and remove the steering wheel (1) with a steering wheel puller. 3. Remove the accelerator lever grip (4).
Page 188 MX5100, WSM CLUTCH Disconnecting Wirings 3 1. After removing the floor seat cover, disconnect the code bands (1), (2), (3), (6). 2. Disconnect the wiring from the transmission housing case. (When reassembling) • Bind the code bands as shown in the pictures.
Page 189 MX5100, WSM CLUTCH Disconnecting Steering Hoses 1. Before disconnect the steering hoses (1), (2), (3), (4), bind the same color tapes to the steering hoses (1), (2), (3), (4) and to the joints of the power steering controller (5). 2. Disconnect the steering hoses (1), (2), (3), (4) from the steering controller (5).
Page 190 MX5100, WSM CLUTCH Removing Steering Support Plates, Accelerating Wire and Clutch Rod 1. Removing the steering support plates (1), (4). 2. Remove the snap pin (2) and disconnect the accelerating wire (3). 3. Remove the split pin (6) from the clutch rod (5). Disconnect the clutch rod (5) from the clutch lever.
Page 191 MX5100, WSM CLUTCH Disconnecting Front Wheel Drive Shaft Coupling (4WD Model Only) 1. Remove the propeller shaft cover mounting bolts (M5) (7). 2. Slide the propeller shaft cover (4), (8). 3. Remove the spring pin (2). 4. Disconnect the coupling (1) from the front axle drive shaft.
Page 192: Disassembling Clutch
MX5100, WSM CLUTCH (2) Disassembling Clutch Clutch Assembly 1. Remove the clutch from the flywheel. (When reassembling) • Direct the shorter end of the clutch disc boss toward the flywheel. • Apply molybdenum disulfide (Three Bond 1901 or equivalent) to the splines of clutch disc boss.
Page 193 MX5100, WSM CLUTCH Removing Release Holder and Clutch Lever 1. Draw out the clutch release hub (4) and the release bearing (5) as a unit. 2. Remove the release fork setting screws (2). 3. Draw out the clutch lever (3) to remove the release fork (1).
Page 194: Disassembling Pto Clutch
MX5100, WSM CLUTCH (3) Disassembling PTO Clutch Removing Steering Post Assembly and Disconnecting Brake Rods 1. Remove the split pin (5) from the accelerating rod. Disconnect the accelerating rod (4) from the accelerating pedal link. 2. Remove the split pin (7) (9) (11) (13) from the brake lever (8), (12).
Page 195 MX5100, WSM CLUTCH Separating Clutch Housing and Mid Case 1. Remove the main gear shift lever (1). 2. Remove the suction pipe (2). 3. Remove the hydraulic filter cartridge (5), the hydraulic block (4), the suction pipe (6), the 3-points hydraulic system delivery pipe (7) and the hydraulic filter bracket.
Page 196 MX5100, WSM CLUTCH Separating Mid Case and Transmission Case 1. Set the disassembling stands under the mid case (1) and the transmission case (6). 2. Remove the snap pin and disconnect the PTO clutch lever wire (2) from the PTO clutch valve (3).
Page 197 MX5100, WSM CLUTCH Removing PTO Clutch Bearing Holder 1. Set the wooden block under the mid case not to tilt the mid case. 2. Remove the PTO clutch bearing holder mounting bolts (3). 3. Remove the front wheel drive shift lever mounting bolt (M8) (8).
Page 198 MX5100, WSM CLUTCH When Reassembling Shafts to PTO Clutch Bearing Holder and Mid Case 1. Assemble the shuttle shift rod (11) to the shuttle shaft assembly (10). 2. Assemble the shafts (5), (8), (10) to the PTO clutch bearing holder (6).
Page 199 MX5100, WSM CLUTCH Disassembling PTO Clutch Assembly 1. Remove the internal snap ring (8), and then take out the clutch discs (5), the back plate (7), the steel plates (6), (9), (10), (11) and (12), the hub (3) and the bearings (2).
Page 200 MX5100, WSM CLUTCH Clutch Case 1. Remove the internal snap ring (1). 2. Remove the external snap ring (2). 3. Remove the clutch case (7) and brake disc (5). (When reassembling) • Direct the contact part of the brake disc (5) to the brake plate (6).
Page 201: Servicing
MX5100, WSM CLUTCH [3] SERVICING (1) Travelling Clutch Backlash between Clutch Disc Boss and Gear Shaft 1. Mount the clutch disc to the gear shaft. 2. Hold the gear shaft so that it may not turn. 3. Rotate disc lightly and measure the displacement around the disc edge.
Page 202 MX5100, WSM CLUTCH Pressure Plate Flatness 1. Place a straight edge on the pressure plate and measure clearance with a feeler gauge at several points. 2. If the clearance exceeds the allowable limit, replace it. 3. When the pressure plate is worn around its outside and its inside surface only is in contact with the straight edge, replace even if the clearance is within the allowable limit.
Page 203: Hydraulic Pto Clutch
MX5100, WSM CLUTCH (2) Hydraulic PTO Clutch Clutch Disc Wear 1. Measure the thickness of PTO clutch disc with vernier calipers. 2. If the thickness is less than the allowable limit, replace it. 1.70 to 1.90 mm Factory spec. 0.067 to 0.075 in.
Page 204 MX5100, WSM CLUTCH Thickness of Seal Ring 1. Measure the thickness of seal rings (1) with an outside micrometer. 2. If the measurement is less than the allowable limit, replace it. 2.45 to 2.50 mm Factory spec. 0.096 to 0.098 in.
Page 205 TRANSMISSION...
Page 207 MECHANISM CONTENTS 1. STRUCTURE ....................3-M1 [1] 2WD ......................3-M1 [2] 4WD ......................3-M2 2. POWER TRAIN ..................... 3-M3 [1] MAIN GEAR SHIFT SECTION.............. 3-M3 [2] SHUTTLE SHIFT SECTION ..............3-M3 [3] RANGE GEAR SHIFT SECTION............3-M3 [4] FRONT WHEEL DRIVE SECTION (FOUR WHEEL DRIVE MODEL) 3-M4 3.
Page 209: Structure
MX5100, WSM TRANSMISSION 1. STRUCTURE [1] 2WD 3-M1...
Page 210: 4Wd
MX5100, WSM TRANSMISSION [2] 4WD 3-M2...
Page 211: Power Train
MX5100, WSM TRANSMISSION 2. POWER TRAIN [1] MAIN GEAR SHIFT SECTION The main gear shift section is located in the clutch housing, and it uses a synchro mesh, a constant mesh and a sliding mesh. Power is transmitted from the engine to the gear shaft (input) (1) to the counter shaft (8) through the main gear shift section.
Page 212: Front Wheel Drive Section (Four Wheel Drive Model) 3-M4
MX5100, WSM TRANSMISSION [4] FRONT WHEEL DRIVE SECTION (FOUR WHEEL DRIVE MODEL) Front wheel drive shift section is located in the differential gear case. Two wheel drive or four wheel drive is selected by operating the front wheel drive lever to shift the shifter gear (7).
Page 213: Pto System
(8) Rear PTO Shaft Shaft) The independent PTO operated by hydraulic clutch pack (3) is adopted to MX5100. The rear PTO is “ENGAGED” or “DISENGAGED” by operating the shift lever of the PTO clutch valve. Mid PTO is not adopted.
Page 214: Pto Clutch
MX5100, WSM TRANSMISSION [2] PTO CLUTCH (1) Shift Linkage The PTO clutch control lever (1) and the PTO clutch valve (4) are connected by the shift cable (3) as shown in the left figure. When the shift lever is moved to the B side, the PTO clutch valve (4) is set at “ENGAGED”...
Page 215: Operation
MX5100, WSM TRANSMISSION (3) Operation When PTO Shift Lever is Set at the “ENGAGED” Position The oil from the regulator valve flows into the clutch valve and opens the check valve (1). When the shift lever is set at the “ENGAGED” position, the spool (2) is turned to (a) position, then the oil flows through the spool (2) into the accumulator and the PTO clutch pack.
Page 216 MX5100, WSM TRANSMISSION When Shift Lever “DISENGAGED” Position When shift lever “DISENGAGED” position, the spool (2) is turned to (b) position, then the oil from the regulator valve is stopped by the spool (2) and the oil in the PTO clutch pack and accumulator is drained into the transmission case.
Page 217 SERVICING CONTENTS 1. TROUBLESHOOTING ..................3-S1 2. SERVICING SPECIFICATIONS ..............3-S2 3. TIGHTENING TORQUES ................3-S3 4. DISASSEMBLING AND SERVICING............3-S5 [1] DISASSEMBLING AND ASSEMBLING..........3-S5 (1) Separating Engine and Clutch Housing Case........3-S5 (2) Separating Clutch Housing and Mid Case ........3-S15 (3) Disassembling Clutch Housing ............3-S17 (4) Separating Mid Case and Transmission Case........3-S24 (5) Disassembling Mid Case ..............3-S25 (6) Disassembling Transmission Case Front Section ......3-S28...
Page 219: Troubleshooting
MX5100, WSM TRANSMISSION 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Excessive Transmission fluid insufficient Replenish Transmission Noise Gear worn or backlash improper Replace – Bearing worn or broken Replace 3-S43 Shift fork worn Replace 3-S43 Spline worn Replace 3-S43...
Page 220: Servicing Specifications
MX5100, WSM TRANSMISSION 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Gear to Spline, Hub to Spline Clearance 0.030 to 0.078 mm 0.2 mm 0.00118 to 0.00307 in. 0.008 in. Shift Fork and Shift Gear Groove Clearance 0.15 to 0.40 mm 0.6 mm...
Page 221: Tightening Torques
MX5100, WSM TRANSMISSION 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-10, G-11.) Item N·m kgf·m lbf·ft Starter B terminal mounting nut 7.8 to 9.8...
Page 222 MX5100, WSM TRANSMISSION Item N·m kgf·m lbf·ft PTO shaft lock nut 147 to 196 15 to 20 108 to 145 PTO shaft bearing case mounting screw 23.5 to 27.5 2.4 to 2.8 17.4 to 20.3 Differential support mounting screw 48.1 to 55.9 4.9 to 5.7...
Page 223: Disassembling And Servicing
MX5100, WSM TRANSMISSION 4. DISASSEMBLING AND SERVICING [1] DISASSEMBLING AND ASSEMBLING (1) Separating Engine and Clutch Housing Case Draining Engine Oil 1. Start and warm up the engine for approx. 5 minutes. 2. Place an oil pan underneath the engine.
Page 224 Transmission fluid capacity 11.6 U.S.gals 9.7 lmp.gals IMPORTANT • Use only KUBOTA SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system. Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page G-8.) • Do not mix different brands of fluid together.
Page 225 MX5100, WSM TRANSMISSION Bonnet and Battery Negative Cable 1. To open the bonnet (1), hold the bonnet (1) with a hand and pull the release lever (2) and open the bonnet (1). 2. Disconnect the battery negative cable (3). 3. Disconnect the head light connector (6).
Page 226 MX5100, WSM TRANSMISSION Draining Coolant CAUTION • Do not remove radiator cap while coolant is hot. When cool, slowly rotate cap to the first stop and allow sufficient time for excess pressure to escape before removing the cap completely. 1. Stop the engine and let cool down.
Page 227 MX5100, WSM TRANSMISSION Disconnecting Wirings 2 1. Remove the seat (1). 2. Disconnect the 4P rear combination lamp connector (2) and the hazard lamp leads (3). 3. Disconnect the 2P connectors (4) from the PTO lever neutral switch. 4. Disconnect the 3P connector (7) from the seat switch (6).
Page 228 MX5100, WSM TRANSMISSION Steering Wheel, Meter Panel and Rear Bonnet 1. Remove the steering wheel cap. 2. Remove the steering wheel mounting nut and remove the steering wheel (1) with a steering wheel puller. 3. Remove the accelerator lever grip (4).
Page 229 MX5100, WSM TRANSMISSION Disconnecting Wirings 3 1. After removing the floor seat cover, disconnect the code bands (1), (2), (3), (6). 2. Disconnect the wiring from the transmission housing case. (When reassembling) • Bind the code bands as shown in the pictures.
Page 230 MX5100, WSM TRANSMISSION Disconnecting Steering Hoses 1. Before disconnect the steering hoses (1), (2), (3), (4), bind the same color tapes to the steering hoses (1), (2), (3), (4) and to the joints of the power steering controller (5). 2. Disconnect the steering hoses (1), (2), (3), (4) from the steering controller (5).
Page 231 MX5100, WSM TRANSMISSION Removing Steering Support Plates, Accelerating Wire and Clutch Rod 1. Removing the steering support plates (1), (4). 2. Remove the snap pin (2) and disconnect the accelerating wire (3). 3. Remove the split pin (6) from the clutch rod (5). Disconnect the clutch rod (5) from the clutch lever.
Page 232 MX5100, WSM TRANSMISSION Disconnecting Front Wheel Drive Shaft Coupling (4WD Model Only) 1. Remove the propeller shaft cover mounting bolts (M5) (7). 2. Slide the propeller shaft cover (4), (8). 3. Remove the spring pin (2). 4. Disconnect the coupling (1) from the front axle drive shaft.
Page 233: Separating Clutch Housing And Mid Case
MX5100, WSM TRANSMISSION (2) Separating Clutch Housing and Mid Case Removing Steering Post Assembly and Disconnecting Brake Rods 1. Remove the split pin (5) from the accelerating rod. Disconnect the accelerating rod (4) from the accelerating pedal link. 2. Remove the split pin (7), (9), (11), (13) from the brake lever (8), (12).
Page 234 MX5100, WSM TRANSMISSION Separating Clutch Housing and Mid Case 1. Remove the main gear shift lever (1). 2. Remove the suction pipe (2). 3. Remove the hydraulic filter cartridge (5), the hydraulic block (4), the suction pipe (6), the 3-points hydraulic system delivery pipe (7) and the hydraulic filter bracket.
Page 235: Disassembling Clutch Housing
MX5100, WSM TRANSMISSION (3) Disassembling Clutch Housing Removing Clutch Lever, Release Fork and Release Bearing 1. Remove the release fork mounting screws (2). 2. Draw out the clutch lever (3) to remove the release fork (1). 3. Remove the release bearing and release hub (4) together.
Page 236 MX5100, WSM TRANSMISSION Removing 25T Gear Shaft 1. Remove the 25T gear shaft (1) as an assembly from the clutch housing. (When reassembling) • Install the 25T gear shaft not to damage the oil seal (5) installed in the 25T gear shaft rear end, using a vinyl tape.
Page 237 MX5100, WSM TRANSMISSION Removing 26T Gear 1. Remove the cir-clip (2). 2. Remove the 26T gear (3). (1) 18T PTO Gear Shaft (4) Cir-clip (2) Cir-clip (5) Collar (3) 26T Gear (6) Cir-clip W10204600 Removing Front Drive Shaft (4WD only) 1.
Page 238 MX5100, WSM TRANSMISSION Removing Shafts 1. Remove the three interlock balls (8) after removing the stopper bolt (1). 2. Remove the clutch housing bearing holder mounting bolts (3). 3. Screw down the two jack bolts (M8) (9) into the clutch housing bearing holder (7).
Page 239 MX5100, WSM TRANSMISSION Removing 18T PTO Gear Shaft 1. After removing the clutch housing bearing holder (3) and the shafts, remove the 18T PTO gear shaft (2) to the rear side. (1) Clutch Housing (3) Clutch Housing Bearing Holder (2) 18T PTO Gear Shaft...
Page 240 MX5100, WSM TRANSMISSION Disassembling Shafts 1. Remove the shafts (6), (7), (8), (9) from the clutch housing bearing holder (10). 2. Disassembling the synchro-counter shaft assembly (6), the main gear shaft assembly (7), the 21T PTO gear shaft assembly (9) and the PTO counter shaft assembly (8).
Page 241 MX5100, WSM TRANSMISSION When Reassembling Shaft Assemblies to Clutch Housing 1. Install the 18T PTO gear shaft (2) to the clutch housing (1). 2. Prepare the box. 3. Turn the clutch housing (1) on the box to install the shaft assemblies (3), (7), (8).
Page 242: Separating Mid Case And Transmission Case
MX5100, WSM TRANSMISSION (4) Separating Mid Case and Transmission Case Separating Mid Case and Transmission Case 1. Set the disassembling stands under the mid case (1) and the transmission case (6). 2. Remove the snap pin and disconnect the PTO clutch lever wire (2) from the PTO clutch valve (3).
Page 243: Disassembling Mid Case
MX5100, WSM TRANSMISSION (5) Disassembling Mid Case Removing PTO Clutch Bearing Holder 1. Set the wooden block under the mid case not to tilt the mid case. 2. Remove the PTO clutch bearing holder mounting bolts (3). 3. Remove the front wheel drive shift lever mounting bolt (M8) (8).
Page 244 MX5100, WSM TRANSMISSION When Reassembling Shafts to PTO Clutch Bearing Holder and Mid Case 1. Assemble the shuttle shift rod (11) to the shuttle shaft assembly (10). 2. Assemble the shafts (5), (8), (10) to the PTO clutch bearing holder (6).
Page 245 MX5100, WSM TRANSMISSION Disassembling Shaft in Mid Case 1. Disassemble the shuttle shaft assembly. 2. Disassemble the shuttle gear shaft assembly. 3. Disassemble the lever shaft assembly. (When reassembling) • If cir-clip or bearing is damaged, replace it. (1) Shuttle Shaft...
Page 246: Disassembling Transmission Case Front Section
MX5100, WSM TRANSMISSION (6) Disassembling Transmission Case Front Section Removing PTO Gear Shaft and 22 Nut 1. Remove the 11T PTO gear shaft (1) and 30T gear (2). 2. Remove the coupling (4) and pull out the coupling (15) using a crowbar.
Page 247 MX5100, WSM TRANSMISSION Disconnecting Linkage 1. Remove the bolt (1) and the snap pin (2). 2. Slide the Hi-Lo shift lever (3) to the outside. 3. Disconnect the linkage between the Hi-Lo shift lever (3) and the Hi-Lo shift folk in the transmission case.
Page 248 MX5100, WSM TRANSMISSION Disassembling Shafts in Transmission Case Front Section 1. Disassembling the shafts assemblies in the transmission case front section. (When reassembling) • If the shaft component part is broken or damaged, replace it. (1) PTO Drive Shaft (18) Shim...
Page 249: Disassembling Transmission Case
Transmission fluid capacity 11.6 U.S.gals 9.7 lmp.gals IMPORTANT • Use only KUBOTA SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system. Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page G-8.) • Do not mix different brands of fluid together.
Page 250 MX5100, WSM TRANSMISSION Step and Center Cover 1. Remove the main gear shift lever (1). 2. Disconnect the differential lock pedal (2). 3. Remove the step (3) and center cover (4). (When reassembling) • Apply grease to the O-ring (5) and take care not to damage it.
Page 251 MX5100, WSM TRANSMISSION Wirings 1. Disconnect the 1P connector (1) for PTO safety switch. 2. Disconnect the 1P connector for hazard light (R.H.), (L.H.) and remove the wiring (2) (R.H.), (L.H.). 3. Disconnect the 1P connector (3) for shuttle safety switch.
Page 252 MX5100, WSM TRANSMISSION Disconnecting Wirings 2 1. Remove the seat. 2. Disconnect the 4P rear combination lamp connector (1) and the hazard lamp leads (2). 3. Disconnect the 2P connectors (3) from the PTO lever neutral switch. 4. Disconnect the 3P connector (6) from the seat switch (5).
Page 253 MX5100, WSM TRANSMISSION Steering Wheel, Meter Panel and Rear Bonnet 1. Remove the steering wheel cap. 2. Remove the steering wheel mounting nut and remove the steering wheel (1) with a steering wheel puller. 3. Remove the accelerator lever grip.
Page 254 MX5100, WSM TRANSMISSION Disconnecting Wirings 3 1. After removing the floor seat cover, disconnect the code bands (1), (2), (3), (6). 2. Disconnect the wiring from the transmission housing case. (When reassembling) • Bind the code bands as shown in the pictures.
Page 255 MX5100, WSM TRANSMISSION Hydraulic Cylinder Assembly 1. Disconnect the draft control rod from the top link bracket. (If equipped.) 2. Remove the hydraulic cylinder assembly mounting screws and nuts. 3. Support the hydraulic cylinder assembly with nylon lift strap and hoist, and then remove it.
Page 256 MX5100, WSM TRANSMISSION Brake Case 1. Remove the brake case mounting screws and nuts. 2. Separate the brake case, tapping the brake case lever lightly. (When reassembling) • Apply grease to the brake ball seats. (Do not grease excessively.) • Apply liquid gasket (Three Bond 1208D or equivalent) to joint face of the brake cae and transmission case, after eliminate the water, oil and stuck liquid gasket.
Page 257 MX5100, WSM TRANSMISSION Transmission Bearing Holder 1. Remove the 11T gear shaft (8). 2. Remove the external snap ring and 30T gear (7). 3. Fix the 22T gear on pinion shaft by locking tool (Code No. 07916- -52311) and remove the staking nut (6).
Page 258 MX5100, WSM TRANSMISSION Differential Lock Shift Fork 1. Tap out the left side spring pin (4). 2. Remove the cotter pin and take out the clevis pin (3). 3. Draw out the differential lock fork shaft (1) and take out the differential lock shift fork (2).
Page 259 MX5100, WSM TRANSMISSION Bearing and Differential Lock Shifter 1. Secure the differential gear in a vise. 2. Remove the differential lock shifter and taper roller bearing as a unit with a puller. W10246640 Differential Case Cover and Differential Side Gear 1.
Page 260 MX5100, WSM TRANSMISSION Differential Pinion Shaft and Differential Pinion 1. Draw out the differential pinion shaft 2 (5), and take out the differential pinion (3) and differential pinion washer (4). 2. Draw out the differential pinion shaft (1), and take out the differential pinion (2) and differential pinion washer.
Page 261: Servicing
MX5100, WSM TRANSMISSION [2] SERVICING Checking Bearing 1. Hold the inner race, and push and pull the outer race in all directions to check for wear and roughness. 2. Apply transmission fluid to the bearing, and hold the inner race.
Page 262 MX5100, WSM TRANSMISSION Spiral Bevel Gear Turning Torque NOTE • It is necessary to adjust the spiral bevel gear turning torque, when replacing the differential gears, transmission case or other relative parts. 1. Assemble the differential gears to transmission case. At this time, install the some shims (3) to the spiral bevel gear side.
Page 263 MX5100, WSM TRANSMISSION Backlash and Tooth Contact between Spiral Bevel Gear and Spiral Bevel Pinion Shaft 1. Set the dial indicator (lever type) with its finger on the tooth surface. 2. Measure the backlash by fixing the spiral bevel pinion shaft (3) and moving the spiral bevel gear (4) by hand.
Page 264 MX5100, WSM TRANSMISSION Clearance between Differential Case Bore (Differential Case Cover Bore) and Differential Side Gear Boss 1. Measure the bore I.D. of the differential case and differential case cover. 2. Measure the differential side gear boss O.D. and calculate the clearance.
Page 265 REAR AXLE...
Page 267 MECHANISM CONTENTS 1. STRUCTURE ....................4-M1...
Page 269 MX5100, WSM REAR AXLE 1. STRUCTURE (1) Ball Bearing (4) Differential Gear Shaft (11T, (7) Ring Gear (10) Differential Lock Shifter (2) Rear Axle Brake Shaft, LH) (8) Differential Pinion (11) Differential Case (3) Rear Axle Case (5) Brake Case...
Page 270 MX5100, WSM REAR AXLE 4-M2...
Page 271 SERVICING CONTENTS 1. TROUBLESHOOTING ..................4-S1 2. TIGHTENING TORQUES ................4-S2 3. CHECKING, DISASSEMBLING AND SERVICING........4-S3 [1] DISASSEMBLING AND ASSEMBLING..........4-S3 (1) Separating Rear Axle Case from Brake Case ........4-S3 (2) Disassembling Rear Axle ..............4-S5...
Page 273: Troubleshooting
MX5100, WSM REAR AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Excessive or Improper backlash between 11T gear and 67T Replace 4-S5 Unusual Noise at All gear Time Bearing worn Replace 4-S5 Insufficient or improper type of transmission fluid...
Page 274 MX5100, WSM REAR AXLE 2. TIGHTENING TORQUES Tightening torques of screws and nuts on the table below are especially specified. (For general use screws and nuts : See page G-10, G-11.) Item N·m kgf·m lbf·ft Rear wheel mounting screw and nut...
Page 275: Tightening Torques
Transmission fluid capacity 11.6 U.S.gals 9.7 lmp.gals IMPORTANT • Use only KUBOTA SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system. Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page G-8.) • Do not mix different brands of fluid together.
Page 276 MX5100, WSM REAR AXLE Rear Axle Case 1. Place the disassembling stand under the rear axle case. 2. Remove the rear axle mounting screws and nuts. 3. Separate the rear axle case from brake case. (When reassembling) • Apply liquid gasket (Three Bond 1208D or equivalent) to joint face of the rear axle case and brake case, after eliminate the water, oil and stuck liquid gasket.
Page 277: Disassembling Rear Axle
MX5100, WSM REAR AXLE (2) Disassembling Rear Axle Rear Axle 1. Remove the ball bearing (9) with a puller. 2. Remove the stake of lock nut (4). 3. Secure the rear axle (1) in a vise and remove the lock nut.
Page 278 MX5100, WSM REAR AXLE 4-S6...
Page 279 BRAKES...
Page 281 MECHANISM CONTENTS 1. STRUCTURE ....................5-M1...
Page 283 (7) Turnbuckle W10125430 MX5100 is used hanging type brake pedals to have wider space of the platform. Independent mechanical wet disc brakes are used for the right and left travelling brakes. They are operated by the brake pedals through the mechanical linkages (2), (4), (6), (7).
Page 284 MX5100, WSM BRAKES (1) Oil Seal (2) Needle Bearing (3) Brake Pedal (4) Return Spring (5) Brake Pedal LH (6) Brake Pedal Shaft (7) Parking Brake Lock (8) Brake Rod 1 (9) Turnbuckle (10) Brake Rod 2 (11) Brake Lever Link Shaft...
Page 285 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 [2] DISASSEMBLING AND ASSEMBLING..........5-S5 (1) Separating Brake Case from Transmission Case.......5-S5 [3] SERVICING ....................5-S8...
Page 287 MX5100, WSM BRAKES 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Uneven Braking Brake pedal play unevenly adjusted Adjust 5-S4 Force Brake disc worn Replace 5-S9 Cam plate warped Replace 5-S8 Brake Drags Brake pedal play too small Adjust 5-S4...
Page 288: Servicing Specifications
MX5100, WSM BRAKES 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Brake Pedal Free Travel 15 to 20 mm – 5/8 to 13/16 in. Keep the free travel in – the right and left brake pedals equal Brake Lever Link Shaft to Bushing Clearance 0.125 to 0.195 mm...
Page 289 MX5100, WSM BRAKES 3. TIGHTENING TORQUES Tightening torques of screws and nuts in the table below are especially specified. (For general use screws and nuts: See page G-10, G-11.) Item N·m kgf·m lbf·ft Rear wheel mounting screw and nut 197 to 226 20 to 23 14.5 to 166...
Page 290: Checking, Disassembling And Servicing
MX5100, WSM BRAKES 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Checking Brake Pedal Free Travel CAUTION • Stop the engine and remove the key, then chock the wheels before checking brake pedal. 1. Release the parking brake. 2. Slightly depress the brake pedals and measure free travel at top of pedal stroke.
Page 291: Disassembling And Assembling
Transmission fluid capacity 11.6 U.S.gals 9.7 lmp.gals IMPORTANT • Use only KUBOTA SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system. Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page G-8.) • Do not mix different brands of fluid together.
Page 292 MX5100, WSM BRAKES ROPS and Fender R.H., L.H. 1. Remove the top link (7), lower link (5) and lift rod (6). 2. Remove the ROPS center (1) and draw out the ROPS upper (2). 3. Remove the ROPS mounting screw and ROPS lower (3), (8).
Page 293 MX5100, WSM BRAKES Brake Case 1. Remove the brake case mounting screws and nuts. 2. Separate the brake case, tapping the brake case lever lightly. (When reassembling) • Apply grease to the brake ball seats. (Do not grease excessively.) • Apply liquid gasket (Three Bond 1208D or equivalent) to joint face of the brake case and transmission case, after eliminate the water, oil and stuck liquid gasket.
Page 294: Servicing
MX5100, WSM BRAKES [3] SERVICING Clearance between Brake Lever Link Shaft and Bushing 1. Measure the brake lever link shaft O.D. with an outside micrometer. 2. Measure the brake lever link bushing I.D. with a cylinder gauge. 3. Calculate the clearance.
Page 295 MX5100, WSM BRAKES Brake Disc Wear 1. Measure the brake disc thickness with vernier calipers. 2. If the measurement is less than the allowable limit, replace it. 4.6 to 4.8 mm Factory spec. 0.181 to 0.189 in. Brake disc thickness 4.2 mm...
Page 296 MX5100, WSM BRAKES 5-S10...
Page 297 FRONT AXLE...
Page 299 MECHANISM CONTENTS 1. STRUCTURE ....................6-M1 [1] 2WD TYPE....................6-M1 [2] 4WD TYPE....................6-M2 2. FRONT WHEEL ALIGNMENT ..............6-M3...
Page 301: Structure
MX5100, WSM FRONT AXLE 1. STRUCTURE The front axle supports the front of tractor and facilitates steering. There are two kinds of front axles. The two- wheel drive axle has free-running front wheels and the four-wheel drive axle has powered front wheels.
Page 302: 4Wd Type
MX5100, WSM FRONT AXLE [2] 4WD TYPE (1) Bevel Gear Case (8) Differential Pinion (14) Bevel Gear (14T) (20) Differential Assembly (2) Bevel Gear (10T) (9) Differential Case (15) Bevel Gear Shaft (21) Spiral Bevel Pinion Shaft (8T) (3) Front Axle Case...
Page 303: Front Wheel Alignment
MX5100, WSM FRONT AXLE 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 304 MX5100, WSM FRONT AXLE Toe-in Viewing the front wheels from above reveals that the distance between the toes of the front wheels is smaller than that between the heels. It is called toe-in. The front wheels tend to roll outward due to the camber, but toe-in offsets it and ensures parallel rolling of the wheels.
Page 305 SERVICING CONTENTS 1. TROUBLESHOOTING ..................6-S1 2. SERVICING SPECIFICATIONS ..............6-S2 3. TIGHTENING TORQUES ................6-S5 4. CHECKING, DISASSEMBLING AND SERVICING........6-S6 [1] CHECKING AND ADJUSTING ...............6-S6 [2] DISASSEMBLING AND ASSEMBLING..........6-S8 (1) Separating Front Axle .................6-S8 (2) Disassembling 2WD Type Front Axle ..........6-S10 (3) Disassembling 4WD Type Front Axle ..........6-S11 [3] SERVICING ....................6-S16 (1) 2WD Type ..................6-S16 (2) 4WD Type ..................6-S17...
Page 307 MX5100, WSM FRONT AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Front Wheels Tire pressure uneven Adjust G-61 Wander to Right or Improper toe-in adjustment (improper alignment) Adjust 6-S6 Left Clearance between front axle middle boss and Replace 6-S16...
Page 308: Servicing Specifications
MX5100, WSM FRONT AXLE 2. SERVICING SPECIFICATIONS 2WD TYPE Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 2 to 8 mm – 0.079 to 0.315 in. Front Wheel Axial Sway Less than 5.0 mm – 0.197 in. Knuckle Shaft to Bushing Clearance 0.000 to 0.285 mm...
Page 309 MX5100, WSM FRONT AXLE 4WD TYPE Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 2 to 8 mm – 0.079 to 0.315 in. Front Wheel Axial Sway Less than 5.0 mm – 0.197 in. Differential Case, Differential Case Cover Clearance 0.04 to 0.123 mm...
Page 310 MX5100, WSM FRONT AXLE 4WD TYPE (Continued) Item Factory Specification Allowable Limit Front Axle Case Boss (Front) to Bracket Clearance 0.025 to 0.160 mm 0.35 mm Bushing 0.00098 to 0.00630 in. 0.0138 in. Front Axle Case Boss (Front) O.D. 49.950 to 49.975 mm –...
Page 311 MX5100, WSM FRONT AXLE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-10, G-11.) 2WD TYPE Item N·m kgf·m lbf·ft Tie-rod clamp screw and nut 39.2 to 49.0...
Page 312: Checking, Disassembling And Servicing
MX5100, WSM FRONT AXLE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Toe-in 1. Park the tractor on the flat place. 2. Inflate the tires to the specified pressure. 3. Turn steering wheel so front wheels are in the straight ahead position.
Page 313 MX5100, WSM FRONT AXLE Adjusting Front Axle Pivot 1. Jack up the tractor body, then loosen the lock nut (2). 2. Measure the adjusting screw tightening torque. 3. If tightening torque is not within the factory specifications, adjust the adjusting screw (1).
Page 314: Disassembling And Assembling
7.0 L Capacity Front axle case oil 7.4 U.S.qts 6.2 Imp.qts IMPORTANT • Use KUBOTA SUPER UDT fluid or SAE80, 90 gear oil. Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page G-8.) (1) Drain Plug (2) Filling Port Plug W10128890 Propeller Shaft (4WD Only) 1.
Page 315 MX5100, WSM FRONT AXLE Power Steering Hoses 1. Disconnect the power steering hoses (1), (2) from steering cylinder. 2. Remove the cylinder cover. (When reassembling) • Connect the power steering hose 1 with green tape to the RH. 24.5 to 29.4 N·m Power steering hose 2.5 to 3.0 kgf·m...
Page 316: Disassembling 2Wd Type Front Axle
MX5100, WSM FRONT AXLE (2) Disassembling 2WD Type Front Axle Front Wheel Hub 1. Remove the front wheel hub cap (1). 2. Draw out the cotter pin. 3. Remove the slotted nut (2). 4. Remove the collar. 5. Remove the front wheel hub (3) with a puller.
Page 317: Disassembling 4Wd Type Front Axle
MX5100, WSM FRONT AXLE Knuckle Shaft 1. Remove the knuckle arm (1) and draw out the knuckle shaft (4) from the front axle. (When reassembling) • Insert the thrust collar (2), (3). • Apply grease to the oil seals (6).
Page 318 MX5100, WSM FRONT AXLE Axle Flange and Front Gear Case 1. Remove the axle flange mounting screws. 2. Remove the axle flange (1). (When reassembling) • Apply grease to the O-ring (2) of axle flange. • Tighten the axle flange mounting screws and nuts diagonally in several steps.
Page 319 MX5100, WSM FRONT AXLE Axle 1. Remove the bearing with a special use puller set (Code No. 07916-09032). 2. Take out the bevel gear (2). 3. Take out the collar (1). 4. Tap out the axle (3). (When reassembling) • Install the oil seal (5) of axle flange (4), noting its direction as shown in the figure below.
Page 320 MX5100, WSM FRONT AXLE Spiral Bevel Pinion Shaft and Differential Gear Assembly 1. Take out the differential yoke shaft (9), (10) both sides. 2. Remove the oil seal (6) and internal snap ring (5). 3. Remove the collar (4). 4. Remove the spiral bevel pinion shaft (3) by the pinion shaft remover (14).
Page 321 MX5100, WSM FRONT AXLE Differential Gear 1. Remove the differential case cover mounting screws (12) and then take out the differential case cover (4), ball bearing (3) and spiral bevel gear (2) as a unit. 2. Remove the external snap ring (1), and then remove the ball bearing (3) and spiral bevel gear (2) as a unit with a puller.
Page 322: Servicing
MX5100, WSM FRONT AXLE [3] SERVICING (1) 2WD Type Clearance between Front Axle Middle Boss and Shaft Bracket Bushing 1. Measure the front axle middle boss O.D. at several points where it contacts with the bushing. 2. Measure the shaft bracket 1 bushing I.D. and bracket 2 bushing I.D.
Page 323: 4Wd Type
MX5100, WSM FRONT AXLE (2) 4WD Type Clearance between Differential Case (Differential Case Cover) and Differential Side Gear 1. Measure the differential side gear 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 324 MX5100, WSM FRONT AXLE Turning Torque of Spiral Bevel Pinion Shaft (Pinion Shaft Only) 1. Install the spiral bevel pinion shaft assembly only to the front axle case. 2. Measure the turning torque of spiral bevel pinion shaft. 3. If the turning torque is not within the factory specifications, adjust with the lock nut.
Page 325 MX5100, WSM FRONT AXLE Backlash between 10T Bevel Gear and 14T Bevel Gear 1. Stick a strip of fuse spots on the 14T bevel gear (1) with grease. 2. Fix the front axle case, bevel gear case and front gear case.
Page 326 MX5100, WSM FRONT AXLE Clearance between Front Axle Case Bosses and Bracket Bushings 1. Measure the front axle case bosses O.D. with an outside micrometer. 2. Measure the bracket bushing I.D. and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace the bracket bushing.
Page 327 STEERING...
Page 329 MECHANISM CONTENTS 1. STRUCTURE ....................7-M1 [1] STEERING LINKAGE ................7-M1 [2] OIL FLOW ....................7-M2 [3] STEERING CYLINDER................7-M3...
Page 331: Structure
MX5100, WSM STEERING 1. STRUCTURE [1] STEERING LINKAGE MX5100 is provided with a hydraulic power steering. The steering controller is connected to the steering cylinder with the hydraulic hoses. This steering is actuated by oil pressure. Accordingly, it does not have mechanical transmitting parts such as steering gear, drag link, etc..
Page 332: Oil Flow
MX5100, WSM STEERING [2] OIL FLOW (1) Transmission Case (2) Oil Filter (3) 3-Point System Hydraulic Pump (4) Power Steering Hydraulic Pump (5) Regulator Valve (6) Check Valve (7) Steering Controller (8) Relief Valve (9) Control Valve (10) Steering Wheel...
Page 333: Steering Cylinder
MX5100, WSM STEERING [3] STEERING CYLINDER (1) Rubber Boots (4) O-ring (7) Scraper Seal (9) Slipper Seal (2) Rod (5) Bushing (8) O-ring (10) Guide (3) Piston (6) Back Up Ring (11) U-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 the tie-rods.
Page 334 MX5100, WSM STEERING 7-M4...
Page 335 SERVICING CONTENTS 1. TROUBLESHOOTING ..................7-S1 2. SERVICING SPECIFICATIONS ..............7-S3 3. TIGHTENING TORQUES ................7-S4 4. CHECKING, DISASSEMBLING AND SERVICING........7-S5 [1] CHECKING ....................7-S5 (1) Hydraulic Pump Test Using Flow-Meter (Power Steering) ....7-S5 (2) Relief Valve (Power Steering) .............7-S7 [2] DISASSEMBLING AND ASSEMBLING..........7-S8 (1) Hydraulic Pump...................7-S8 (2) Steering Wheel and Steering Controller ...........7-S11 (3) Steering Cylinder ................7-S15...
Page 337 MX5100, WSM STEERING 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Tractor Can Not Be Steering controller broken Replace 7-S14 Steered Pipe or hose broken Replace 7-S13, S15 Front Wheels Vibrate Power steering controller centering spring Replace controller 7-S14 weaken or broken...
Page 338 MX5100, WSM STEERING Reference Symptom Probable Cause Solution Page Wheels Are Turned Piping or hose connected in reversed Repair 7-S8, S13, to a Direction Opposite to Steering Direction Noise Air sucked in pump due to lack of oil Replenish G-31...
Page 339: Servicing Specifications
MX5100, WSM STEERING 2. SERVICING SPECIFICATIONS POWER STEERING HYDRAULIC PUMP Item Factory Specification Allowable Limit Hydraulic Pump Delivery at No Above – Condition Pressure 18.6 L/min. • Engine Speed : 4.91 U.S.gals./min. Approx. 2700 min (rpm) 4.09 Imp.gals./min. • Rated Pressure : [2WD Type]..10.7 to 11.7 MPa...
Page 340 MX5100, WSM STEERING 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-10, G-11.) Item N·m kgf·m lbf·ft Power steering main delivery hose joint bolt 49.0 to 58.8...
Page 341: Checking, Disassembling And Servicing
MX5100, WSM STEERING 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING (1) Hydraulic Pump Test Using Flow-Meter (Power Steering) Preparation 1. Remove the power steering main delivery hose (1). (When reassembling) • Install the copper washers securely. 49.0 to 58.8 N·m...
Page 342 STEERING Hydraulic Flow Test (Power Steering) IMPORTANT • When using a flowmeter which is not specified by KUBOTA, be sure to follow the instructions for that flowmeter. • Since the flowmeter has no relief valve, do not close the flowmeter loading valve completely before testing.
Page 343: Relief Valve (Power Steering)
MX5100, WSM STEERING (2) Relief Valve (Power Steering) Power Steering Relief Valve Setting Pressure 1. Disconnect the power steering delivery pipe joint bolt. 2. Install the adaptor 1 (5) and the adaptor 2 (6) to the regulator valve, and then set the thread joint (7), the cable (8) and the pressure gauge.
Page 344: Disassembling And Assembling
MX5100, WSM STEERING [2] DISASSEMBLING AND ASSEMBLING IMPORTANT • The hydraulic pump is precision machined and assembled : if disassemble once, it may be unable to maintain its original performance. Therefore, when the hydraulic pump fails, replacement should be carried out with the hydraulic pump assemble except when emergency repair is unavoidable.
Page 345: Hydraulic Pump
MX5100, WSM STEERING Removing Regulator Valve and Hydraulic Pump Assembly 1. Remove the regulator valve (1). 2. Remove the hydraulic pump mounting screw and nut. 3. Take out the hydraulic pump assembly (2). (When reassembling) • Apply grease to the O-ring and take care not to damage it.
Page 346 MX5100, WSM STEERING Hydraulic Pump Running-In After reassembly, perform break-in operation in the following manner, and check the pump for abnormality before use. If the pump temperature should rise noticeably during running-in, recheck should be performed. 1. Install the hydraulic pump to the tractor, and mount the suction pipe and delivery pipe securely.
Page 347: Steering Wheel And Steering Controller
[Component Parts of Steering Controller] 1. In MX5100, component parts of the steering controller are not adopted. The component parts are not provided by Kubota. 2. If the oil leakage from the steering controller assembly is found, replace the steering controller as an assembly.
Page 348 MX5100, WSM STEERING Steering Wheel, Meter Panel and Rear Bonnet 1. Remove the steering wheel cap. 2. Remove the steering wheel mounting nut and remove the steering wheel (1) with a steering wheel puller. 3. Remove the accelerator lever grip (4).
Page 349 MX5100, WSM STEERING Disconnecting Steering Hoses 1. Before disconnect the steering hoses (1), (2), (3), (4), bind the same color tapes to the steering hoses (1), (2), (3), (4) and to the joints of the power steering controller (5). 2. Disconnect the steering hoses (1), (2), (3), (4) from the steering controller (5).
Page 350 MX5100, WSM STEERING Removing Steering Controller 1. Loosen and remove the steering controller mounting nuts (1). 2. Take out the steering controller (2) and joint shaft (3) as an assembly. (When reassembling) • Apply grease to the joint shaft (3).
Page 351: Steering Cylinder
MX5100, WSM STEERING (3) Steering Cylinder Removing Tie-rod End CAUTION • Since power steering cylinder is full of high-pressured transmission oil, the high-pressured oil is injected out from hose joints by pushing the front wheel. • This injected oil can penetrate the skin or eyes causing serious injury.
Page 352 MX5100, WSM STEERING Removing Steering Cylinder CAUTION • Since power steering cylinder is full of high-pressured transmission oil, the high-pressured oil is injected out from hose joints by pushing the front wheel. • This injected oil can penetrate the skin or eyes causing serious injury.
Page 353: Servicing
MX5100, WSM STEERING [3] SERVICING (1) Hydraulic Pump (Power Steering) Housing Bore (Depth of Scratch) 1. Check for the scratch on the interior surface of the housing caused by the gear. 2. If the scratch reaches more than half the area of the interior surface of the housing, replace at pump assembly.
Page 354: Steering Cylinder
MX5100, WSM STEERING (2) Steering Cylinder 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 tube. 50.000 to 50.062 mm 1.96850 to 1.97094 in.
Page 355 HYDRAULIC SYSTEM...
Page 357 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT .................. 8-M1 2. STRUCTURE ....................8-M2 3. HYDRAULIC CIRCUIT FOR THREE POINT HYDRAULIC SYSTEM..8-M3 4. HYDRAULIC CYLINDER ................8-M4 5. POSITION CONTROL VALVE ..............8-M5 6. LINKAGE MECHANISM................8-M6 [1] POSITION CONTROL ................8-M6 [2] POSITION CONTROL VALVE (Code No.
Page 359: Hydraulic Circuit
MX5100, WSM HYDRAULIC SYSTEM 1. HYDRAULIC CIRCUIT (1) Transmission Case (5) Front Hydraulic Block (10) Hydraulic Pump (for Power (13) PTO Clutch Valve (Refer to (2) Oil Filter (6) Position Control Valve Steering and PTO Clutch) CLUTCH Section) (3) Hydraulic Pump (for 3-points...
Page 360: Structure
MX5100, WSM HYDRAULIC SYSTEM 2. STRUCTURE (1) 3-Point System Hydraulic (4) Position Control Valve (7) Quick Coupler (If Equipped) A : Delivery Lines Pump (5) Hydraulic Cylinder (8) Oil Tank (Transmission Case) B : Suction or Drain Lines (2) Front Hydraulic Block...
Page 361: Hydraulic Circuit For Three Point Hydraulic System
MX5100, WSM HYDRAULIC SYSTEM 3. HYDRAULIC CIRCUIT FOR THREE POINT HYDRAULIC SYSTEM (1) Oil Tank (Transmission Case) (2) Hydraulic Oil Filter Cartridge (3) Engine (4) 3-Point System Hydraulic Pump (5) Relief Valve (6) Front Hydraulic Block (7) Position Control Valve...
Page 362 MX5100, WSM HYDRAULIC SYSTEM 4. HYDRAULIC CYLINDER (1) Lowering Speed Adjusting (4) Hydraulic Cylinder (8) Hydraulic Rod (12) Position Control Arm Knob (5) O-ring (9) Hydraulic Arm (13) Spool Drive Lever (2) Lowering Speed Adjusting (6) Back-up Ring (10) Hydraulic Arm Shaft...
Page 363 MX5100, WSM HYDRAULIC SYSTEM 5. POSITION CONTROL VALVE (Code No. YR908-00100) (1) Nut 1 (2) Set Screw (3) Washer (4) Spring (5) Spring (6) Poppet 1 (7) Valve Seat (8) Sleeve (9) Backup Ring (10) Poppet 2 (11) Plug (12) Spring...
Page 364: Linkage Mechanism
MX5100, WSM HYDRAULIC SYSTEM 6. LINKAGE MECHANISM [1] POSITION CONTROL (1) Position Control Lever (2) Control Arm (3) Spool Drive Lever (4) Spool Joint 1 (5) Spool Head (6) Position Control Valve Body (7) Feedback Lever Shaft (8) Feedback Lever...
Page 365 MX5100, WSM HYDRAULIC SYSTEM Lifting 1. When the position control lever is moved to the LIFT position, the control arm (2) rotates to the arrow. Therefore, the spool drive lever (1) moves around the fulcrum P and pulls the spool (3) opening the LIFTING circuit in the position control valve (6).
Page 366 MX5100, WSM HYDRAULIC SYSTEM Lowering 4. When the position control lever is moved to the LOWERING position, the control arm (2) rotates to the arrow. Therefore, the spool drive lever (1) moves around the fulcrum P and pushes the spool (3) and poppet 2 (4) opening the LOWERING circuit in the position control valve (6).
Page 367 MX5100, WSM HYDRAULIC SYSTEM [2] POSITION CONTROL VALVE (Code No. YR908-00100) OIL FLOW Neutral Position Pressurized oil flows at the P port, pushes open unload poppet (2) and returns to the transmission case from T port. The oil in the A chamber (a) behind the unload poppet (2) returns to the transmission case through the clearance between spool (1) and control valve body (6).
Page 368 MX5100, WSM HYDRAULIC SYSTEM Lowering Position When the control lever is moved to DOWN position, spool (1) moves to arrow-mark direction, and poppet 2 (4) is pushed by set screw (5). As the poppet 2 (4) is pushed, an oil circuit of C port to T port is formed.
Page 369: Position Control With Draft Operation (If Equipped)8-M11
MX5100, WSM HYDRAULIC SYSTEM [3] POSITION CONTROL WITH DRAFT OPERATION (IF EQUIPPED) Draft control is a system which maintains a constant traction load, and is suited for the work which needs heavy traction load such as plowing. The implement is automatically raised when its traction load is increased, and lowers when the traction load is decreased.
Page 370 MX5100, WSM HYDRAULIC SYSTEM (1) Lift Arm (2) Hydraulic Arm Shaft (3) Feedback Rod Stay (4) Feedback Rod (5) Draft Cam (6) Draft Control Lever Shaft (7) Position Control Link (8) Position Control Lever (9) Draft Control Lever (10) Arm 2...
Page 371: Mixed Control
MX5100, WSM HYDRAULIC SYSTEM [4] MIXED CONTROL Mixed control is a system combining position control with draft control. When traction load increases, the draft control functions to raise the lift arms (implement). When traction load decreases, the lift arms (implement) lower to the height set by the position control lever.
Page 372: Front Hydraulic Block
MX5100, WSM HYDRAULIC SYSTEM 7. FRONT HYDRAULIC BLOCK (1) Cap A : To Implement Control Valve C : To Position Control Valve : To Transmission Case (2) Front Hydraulic Block B : From Implement Control P : From Hydraulic Pump...
Page 373 SERVICING CONTENTS 1. TROUBLESHOOTING ..................8-S1 2. SERVICING SPECIFICATIONS ..............8-S3 3. TIGHTENING TORQUES ................8-S6 4. CHECKING, DISASSEMBLING AND SERVICING........8-S7 [1] CHECKING, DISASSEMBLING AND ASSEMBLING......8-S7 (1) Hydraulic Pump Test Using Flow-meter (Power Steering) ....8-S7 (2) Relief Valve (Power Steering) .............8-S9 (3) Hydraulic Pump Test Using Flow-meter (3-Points Hydraulic System) .8-S9 (4) Relief Valve (3-Points Hydraulic System) .........8-S11 [2] DISASSEMBLING AND ASSEMBLING..........8-S14 (1) Hydraulic Pump (Power Steering, 3-Point Hydraulic System) ..8-S14...
Page 375 MX5100, WSM HYDRAULIC SYSTEM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Implement Does Not Control linkage improperly adjusted Adjust 8-S12, S13 Rise (Without Noise) Control linkage improperly assembled or Repair or replace 8-S12, S20, damaged Position control valve malfunctioning...
Page 376 MX5100, WSM HYDRAULIC SYSTEM Reference Symptom Probable Cause Solution Page Implement Hunts Poppet 1 valve seat surface damaged (control Replace 8-S21, S22 (Moves Up and valve) Down) Poppet 1 fulcrum pin O-ring damaged (control Replace 8-S21, S22 valve) Poppet 2 sleeve seat surface damaged (control...
Page 377: Servicing Specifications
MX5100, WSM HYDRAULIC SYSTEM 2. SERVICING SPECIFICATIONS POWER STEERING HYDRAULIC PUMP Item Factory Specification Allowable Limit Hydraulic Pump Delivery at No Above – Condition Pressure 18.6 L/min. • Engine Speed : Approx. 2700 min 4.91 U.S.gals./min. (rpm) 4.09 Imp.gals./min. • Rated Pressure : [2WD Type]..10.7 to 11.7 MPa...
Page 378 MX5100, WSM HYDRAULIC SYSTEM THREE POINT SYSTEM HYDRAULIC PUMP Item Factory Specification Allowable Limit Hydraulic Pump Delivery at No Above – Condition Pressure 35.8 L/min. • Engine speed : 9.46 U.S.gals/min. Approx. 2700 min (rpm) 7.87 Imp.gals/min. • Rated Pressure : 18.1 to 19.1 MPa...
Page 379 MX5100, WSM HYDRAULIC SYSTEM HYDRAULIC CYLINDER Item Factory Specification Allowable Limit Hydraulic Cylinder Bore I.D. 90.000 to 90.050 mm 90.150 mm 3.54330 to 3.54527 in. 3.54921 in. Hydraulic Arm Shaft to Bushing Clearance (Right) 0.125 to 0.230 mm 0.50 mm 0.00492 to 0.00906 in.
Page 380 MX5100, WSM HYDRAULIC SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-10, G-11.) Item N·m kgf·m lbf·ft Power steering main delivery pipe joint bolt 49.0 to 58.8...
Page 381: Checking, Disassembling And Servicing
MX5100, WSM HYDRAULIC SYSTEM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING, DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump Test Using Flow-meter (Power Steering) Preparation 1. Open the bonnet. 2. Remove the delivery pipe joint bolt (2) and power steering main delivery hose (3).
Page 382 HYDRAULIC SYSTEM Hydraulic Flow Test (Power Steering) IMPORTANT • When using a flowmeter which is not specified by KUBOTA, be sure to follow the instructions for that flowmeter. • Since the flowmeter has no relief valve, do not close the flowmeter loading valve completely before testing.
Page 383: Relief Valve (Power Steering)
MX5100, WSM HYDRAULIC SYSTEM (2) Relief Valve (Power Steering) Relief Valve Setting Pressure 1. Disconnect the power steering delivery main delivery hose joint bolt. 2. Install the adaptor 1 (3) and the adaptor 2 (4) to the regulator valve, and then set the thread joint (2), the cable (1) and the pressure gauge.
Page 384 HYDRAULIC SYSTEM Hydraulic Flow Test (3-Points Hydraulic System) IMPORTANT • When using a flowmeter which is not specified by KUBOTA, be sure to flow the instructions for that flowmeter. • Since the flowmeter has no relief valve, do not close the flowmeter loading valve completely before testing.
Page 385: Relief Valve (3-Points Hydraulic System)
MX5100, WSM HYDRAULIC SYSTEM (4) Relief Valve (3-Points Hydraulic System) Relief Valve Setting Pressure 1. Remove the plug (1) from the hydraulic cylinder block (2). 2. Install the adaptor. Then connect the hose and pressure gauge to the adaptor. 3. Remove the position control lever stopper (5).
Page 386 MX5100, WSM HYDRAULIC SYSTEM Position Control Feedback Rod Adjustment 1. Set the position control lever (1) (the draft control lever (2), if equipped) to the lowest position. 2. Start the engine and set the engine at idling speed (allow the engine to warm up for approx.
Page 387 MX5100, WSM HYDRAULIC SYSTEM Adjusting Draft Control Rod (If Equipped) 1. Set the draft control lever (1) to the lowest position. 2. Adjust the position control feedback rod. (Refer to "Adjusting Position Control Feedback Rod" See page 8-S12). 3. Start the engine.
Page 388: Disassembling And Assembling
MX5100, WSM HYDRAULIC SYSTEM [2] DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump (Power Steering, 3-Point Hydraulic System) Preparation 1. Disconnect the PTO clutch delivery pipe (3), the power steering delivery hose (9) and the power steering return hose (7) from the regulator valve (11).
Page 389 MX5100, WSM HYDRAULIC SYSTEM Hydraulic Pump Assembly 1. Remove the pump cover mounting screw (7). 2. Remove the drive gear (6), driven gear (2) and side plate (3) from the casing. (When reassembling) • Take care not to damage the gasket.
Page 390: Hydraulic Cylinder
MX5100, WSM HYDRAULIC SYSTEM (2) Hydraulic Cylinder Seat, Wiring Harness and Fenders 1. Remove lift-rods (1), top link (2) and rear wheels. 2. Remove seat (3). 3. Remove step cover (4). 4. Remove upper part of position control lever (5).
Page 391 MX5100, WSM HYDRAULIC SYSTEM Disconnecting Wirings 1 1. Remove the seat (1). 2. Disconnect the 4P rear combination lamp connector (2) and the hazard lamp leads (3). 3. Disconnect the 2P connectors (4) from the PTO lever neutral switch. 4. Disconnect the 3P connector (7) from the seat switch (6).
Page 392 MX5100, WSM HYDRAULIC SYSTEM Disconnecting Wirings 2 1. After removing the floor seat cover, disconnect the code bands (1), (2), (3), (6). 2. Disconnect the wiring from the transmission housing case. (When reassembling) • Bind the code bands as shown in the pictures.
Page 393 MX5100, WSM HYDRAULIC SYSTEM Hydraulic Rod and Hydraulic Piston 1. Tap out the spring pin (1). 2. Remove the hydraulic rod (3). 3. Remove the plug (screw head size: 17 mm) from front of hydraulic cylinder. 4. Inject the compressed air through the plug hole, and take out the hydraulic piston (4).
Page 394 MX5100, WSM HYDRAULIC SYSTEM Lift Arm, Hydraulic Arm and Hydraulic Arm Shaft 1. Disconnect the feedback rod from feedback lever. 2. Remove the lift arm setting screws. 3. Remove the lift arm LH (4). 4. Draw out the hydraulic arm shaft (5) and lift arm RH (6) as a unit.
Page 395: Position Control Valve
MX5100, WSM HYDRAULIC SYSTEM (3) Position Control Valve Removing Position Control Valve 1. Loosen and remove the position control valve mounting screws. 2. Take out the position control valve (1). (When reassembling) • Take care not to damage the O-rings.
Page 396 MX5100, WSM HYDRAULIC SYSTEM Assembling Position Control Valve 1. Install the position control valve (7) to the hydraulic cylinder (8). 2. Install the position control linkage including the position control lever, the control arm, the spool drive lever (1), the feedback lever shaft and the feedback rod.
Page 397: Relief Valve
MX5100, WSM HYDRAULIC SYSTEM (4) Relief Valve Relief Valve 1. Remove the plug (9), and draw out the spring (5) and the poppet (4). 2. Take out the valve seat (3). (When reassembling) • Take care not to damage the O-rings (8).
Page 398: Cylinder Safety Valve
MX5100, WSM HYDRAULIC SYSTEM (5) Cylinder Safety Valve Cylinder Safety Valve 1. Remove the cylinder safety valve assembly (7). 2. Secure the cylinder safety valve assembly (7) with a vise. 3. Loosen the lock nut (2), and remove the adjust screw (1).
Page 399: Position Control And Draft Control Linkage (If Equipped)
MX5100, WSM HYDRAULIC SYSTEM (6) Position Control and Draft Control Linkage (If equipped) (1) Feedback Rod Stay (2) Feedback Rod (Position Control) (3) Draft Cam (4) Draft Control Lever Shaft (5) Position Control Link (6) Position Control Lever (7) Draft Control Lever...
Page 400: Servicing
MX5100, WSM HYDRAULIC SYSTEM [3] SERVICING (1) Hydraulic Pump (Power Steering, 3-Point System) Housing Bore (Depth of Scratch) 1. Check for the scratches on the interior surface of the housing caused by the gear. 2. If the scratches reach more than half the area of the interior surface of the housing, replace the pump assembly.
Page 401: Hydraulic Cylinder
MX5100, WSM HYDRAULIC SYSTEM (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 402 MX5100, WSM HYDRAULIC SYSTEM 8-S28...
Page 403 ELECTRICAL SYSTEM...
Page 405 MECHANISM CONTENTS 1. WIRING DIAGRAM ..................9-M1 2. ENGINE STARTING SYSTEM ..............9-M3 [1] ELECTRIC CIRCUIT................9-M3 [2] SAFETY SWITCH ................... 9-M4 (1) PTO Neutral Switch ................9-M4 (2) Shuttle Lever Neutral Switch.............. 9-M4 3. OPC (OPERATOR PRESENCE CONTROL) SYSTEM......9-M5 [1] ELECTRICAL CIRCUIT ................
Page 407: Wiring Diagram
MX5100, WSM ELECTRICAL SYSTEM 1. WIRING DIAGRAM 9-M1...
Page 408 MX5100, WSM ELECTRICAL SYSTEM Color of Wiring B ....Black L/R .... Blue / Red R/W .... Red / White B/L .... Black / Blue L/W ... Blue / White R/Y ..... Red / Yellow B/R .... Black / Red L/Y ....
Page 409: Engine Starting System
MX5100, WSM ELECTRICAL SYSTEM 2. ENGINE STARTING SYSTEM [1] ELECTRIC CIRCUIT (1) Battery (5) Fuse (5A) (9) PTO Neutral Switch 2 a : Seated (2) Starter (6) Slow Blow Fuse (50A) (10) Shuttle Lever Neutral Switch 1 b : Vacant...
Page 410: Safety Switch
MX5100, WSM ELECTRICAL SYSTEM [2] SAFETY SWITCH (1) PTO Neutral Switch The PTO neutral switch (2) is mounted on the PTO shift lever stay. It serves as a safety switch of engine starting and OPC system. It consists of 2 electric switches (3) (4).
Page 411: Opc (Operator Presence Control) System
MX5100, WSM ELECTRICAL SYSTEM 3. OPC (OPERATOR PRESENCE CONTROL) SYSTEM [1] ELECTRICAL CIRCUIT (1) Battery (7) Key Switch (13) Seat Switch a : Seated (2) Starter (8) Key Stop Solenoid (14) PTO Neutral Switch 1 b : Vacant (3) Slow Blow Fuse (50A)
Page 412 MX5100, WSM ELECTRICAL SYSTEM The operator presence control (OPC) system which automatically stops the engine when operator stands up from the seat while shifting the PTO shift lever or synchro-shuttle shift lever. This system is controlled by the seat switch (13), the PTO switch 1 (14), the shuttle lever neutral switch 1 (16), the OPC timer (11), the key stop solenoid relay (9) and the key stop solenoid (8).
Page 413 MX5100, WSM ELECTRICAL SYSTEM PTO Lever “OFF”, Synchro-Shuttle Shift Lever “Forward” or “Reverse” and Seat “Vacant” : Engine Stops (1) Battery (7) Key Switch (13) Seat Switch a : Seated (2) Starter (8) Key Stop Solenoid (14) PTO Neutral Switch 1...
Page 414 MX5100, WSM ELECTRICAL SYSTEM PTO Lever “ON”, Synchro-Shuttle Shift Lever “Neutral” and Seat “Vacant” : Engine Stops (1) Battery (7) Key Switch (13) Seat Switch a : Seated (2) Starter (8) Key Stop Solenoid (14) PTO Neutral Switch 1 b : Vacant...
Page 415 MX5100, WSM ELECTRICAL SYSTEM PTO Lever “OFF”, Synchro-Shuttle Shift Lever “Neutral” and Seat “Vacant” : Engine does not Stop (1) Battery (7) Key Switch (13) Seat Switch a : Seated (2) Starter (8) Key Stop Solenoid (14) PTO Neutral Switch 1...
Page 416 MX5100, WSM ELECTRICAL SYSTEM PTO Lever “ON”, Synchro-Shuttle Shift Lever “Neutral” and Seat “Turned Over” : Engine does not Stop (1) Battery (7) Key Switch (13) Seat Switch a : Seated (2) Starter (8) Key Stop Solenoid (14) PTO Neutral Switch 1...
Page 417: Safety Switch
MX5100, WSM ELECTRICAL SYSTEM [2] SAFETY SWITCH (1) PTO Neutral Switch The PTO neutral switch is mounted on the PTO shift lever stay. It serves as a safety switch of engine starting and OPC system. It consists of 2 electric switches (3) (4).
Page 418: Seat Switch
MX5100, WSM ELECTRICAL SYSTEM (3) Seat Switch The seat switch (2) is mounted on the seat rail (4) under the operator’s seat (1). It serves as a safety switch of OPC system. It detects the position of the operator’s seat.
Page 419 SERVICING CONTENTS 1. TROUBLESHOOTING ..................9-S1 2. SERVICING SPECIFICATIONS ..............9-S5 3. TIGHTENING TORQUES ................9-S6 4. CHECKING, DISASSEMBLING AND SERVICING........9-S7 [1] CHECKING AND ADJUSTING ...............9-S7 (1) Battery....................9-S7 (2) Main Switch..................9-S9 (3) Safety Switch ..................9-S11 (4) Operator Presence Control ...............9-S12 (5) Starter and Starter Relay ..............9-S15 (6) Glow Control System ................9-S17 (7) Engine Stop Solenoid ...............9-S17 (8) Charging System ................9-S19...
Page 421 MX5100, WSM ELECTRICAL SYSTEM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page All Electrical Battery discharged or defective Recharge or replace G-24 Equipments Do Not Battery positive cable disconnected or Repair or replace 9-S7 Operate improperly connected Battery negative cable disconnected or...
Page 422 MX5100, WSM ELECTRICAL SYSTEM OPC (OPERATOR PRESENCE CONTROL) Reference Symptom Probable Cause Solution Page Does Not Stop Seat switch defective Replace 9-S13 Engine Key stop solenoid relay defective Replace 9-S18 Key stop solenoid defective Replace 9-S18 OPC timer defective Replace...
Page 423 MX5100, WSM ELECTRICAL SYSTEM LIGHTING SYSTEM Reference Symptom Probable Cause Solution Page Headlight Does Not Head lamp relay fuse blown (15 A) Replace G-42 Light Bulb blown Replace G-42 Wiring harness disconnected or improperly Repair or replace – connected (between main switch AC terminal...
Page 424 MX5100, WSM ELECTRICAL SYSTEM EASY CHECKER Reference Symptom Probable Cause Solution Page Engine Oil Pressure Engine oil pressure too low Repair engine 1-S48 Lamp Lights Up Engine oil insufficient Replenish G-19 When Engine is Engine oil pressure switch defective Replace...
Page 425: Servicing Specifications
MX5100, WSM ELECTRICAL SYSTEM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Starter Commutator O.D. 30.0 mm 29.0 mm 1.181 in. 1.142 in. Mica Under Cut 0.50 to 0.80 mm 0.20 mm 0.0197 to 0.0315 in. 0.0079 in. Brush Length 15.0 mm...
Page 426: Tightening Torques
MX5100, WSM ELECTRICAL SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-10, G-11.) Item N·m kgf·m lbf·ft Alternator pulley nut 58.3 to 78.9...
Page 427: Checking, Disassembling And Servicing
MX5100, WSM ELECTRICAL SYSTEM 4. CHECKING, DISASSEMBLING AND SERVICING 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. • Never remove the battery cap while the engine is running.
Page 428 MX5100, WSM ELECTRICAL SYSTEM 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 429: Main Switch
MX5100, WSM ELECTRICAL SYSTEM (2) Main Switch Removing Main Switch 1. Remove the meter panel (2) from the rear bonnet. Refer to “1. ENGINE” section. 2. Disconnect the main switch 4P connector. 3. Perform the following checking. (1) Main Switch 4P Connector...
Page 430 MX5100, WSM ELECTRICAL SYSTEM Main Switch at START Position 1. Turn and hold the main switch key at the START position. 2. Measure the resistances with an ohmmeter across the B terminal and the G terminal, and across the B terminal and the AC terminal, and across the B terminal and the ST terminal.
Page 431: Safety Switch
MX5100, WSM ELECTRICAL SYSTEM (3) Safety Switch Safety Switch Continuity 1. Disconnect the connectors (3) from the PTO lever safety switches (2). 2. Disconnect the connectors from the shuttle lever neutral switches (5). 3. Connect the circuit tester to each safety switch's terminals.
Page 432: Operator Presence Control
MX5100, WSM ELECTRICAL SYSTEM (4) Operator Presence Control Preparation before checking 1. Sit on operator's seat. 2. Set the parking brake. 3. Shift the main gear shift lever and the synchro-shuttle shift lever to “NEUTRAL” position. 4. Shift the PTO lever (PTO clutch control lever) to “OFF” position.
Page 433 MX5100, WSM ELECTRICAL SYSTEM Checking Seat Switch 1. Remove the seat. 2. Disconnect the seat switch connector (3). 3. Change the angle of the seat switch lever (1) and measure the resistance between connector terminals, referring to the table below.
Page 434 MX5100, WSM ELECTRICAL SYSTEM Checking OPC Timer 1. Remove the timer. (OPC timer is located behind the panel. Refer to “3. TRANSMISSION” section.) 2. Connect the jumper leads across the battery positive terminal and the timer a terminal, and across the battery positive terminal and the timer b terminal.
Page 435: Starter And Starter Relay
MX5100, WSM ELECTRICAL SYSTEM (5) Starter and Starter Relay Starter Motor B Terminal Voltage 1. Measure the voltage across the B terminal and chassis. 2. If the voltage differs from the battery voltage, check the battery cable. Starter motor B terminal Factory spec.
Page 436 MX5100, WSM ELECTRICAL SYSTEM Starter Relay (Lo Lamp Relay and Hi Lamp Relay) 1. Open the panel board and remove the starter relay. 2. Apply battery voltage between terminal 2 and 4, and check for continuity between terminal 1 and 3.
Page 437: Glow Control System
MX5100, WSM ELECTRICAL SYSTEM (6) Glow Control System Glow Plug Lead Terminal Voltage 1. Disconnect the wiring lead (1) from the glow plug (2) 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 438 MX5100, WSM ELECTRICAL SYSTEM Stop Solenoid Coil 1. Disconnect the 2P connector from engine stop solenoid. 2. Measure the resistance between the terminal 1, terminal 2 and body. 3. If resistance differs from the factory specifications, the coil is faulty.
Page 439: Charging System
MX5100, WSM ELECTRICAL SYSTEM (8) Charging System Alternator 1. Disconnect the 2P connector (3) from alternator after turning the main switch OFF. 2. Perform the following checks. (1) B Terminal (3) 2P Connector (2) Alternator W1026689 Connector Voltage 1. Turn the main switch OFF. Measure the voltage between the B terminal (1) and the chassis.
Page 440: Combination Switch
MX5100, WSM ELECTRICAL SYSTEM (9) Combination Switch Combination Switch 1. Turn off the main switch (1). 2. Remove the panel board (2). 3. Perform the following checks. (1) Main Switch (3) Combination Switch (2) Panel Board W1107080 Connector Voltage (Wire Harness Side) 1.
Page 441 MX5100, WSM ELECTRICAL SYSTEM Head LIght Switch Continuity when Setting Switch at OFF Position 1. Disconnect the connector 8P from the combination switch. 2. Set the light switch to the OFF position. 3. Measure the resistance with an ohmmeter across the B1 terminal to the T terminal, the B1 terminal to the 1 terminal and the B1 terminal to the 2 terminal.
Page 442: Hazard Switch
MX5100, WSM ELECTRICAL SYSTEM (10) Hazard Switch Hazard Switch Continuity 1. Measure the resistance with ohmmeter between the a terminal and c terminal, between the d terminal and e terminal. 2. If the measurement is not the same as below, the hazard switch or the bulb is faulty.
Page 443: Fuel Level Sensor
MX5100, WSM ELECTRICAL SYSTEM (12) Fuel Level Sensor Fuel Level Sensor 1. Remove the fuel level sensor from the fuel tank. 2. Measure the resistance across the sensor terminal and its body. 3. If resistance does not meet reference value, the sensor is faulty.
Page 444: Coolant Temperature Sensor
MX5100, WSM ELECTRICAL SYSTEM (13) Coolant Temperature Sensor Coolant Temperature Sensor 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 445: Engine Oil Pressure Switch
MX5100, WSM ELECTRICAL SYSTEM (14) Engine Oil Pressure Switch Engine Oil Pressure Switch Panel Board and Wiring Harness 1. Disconnect the lead from the engine oil pressure switch after turning the main switch OFF. 2. Turn the main switch ON and connect a jumper lead from the lead to the chassis.
Page 446: Disassembling And Assembling
MX5100, WSM ELECTRICAL SYSTEM [2] DISASSEMBLING AND ASSEMBLING (1) Starter Disassembling 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).
Page 447: Alternator
MX5100, WSM ELECTRICAL SYSTEM (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) 58.3 to 78.9 N·m...
Page 448 MX5100, WSM ELECTRICAL SYSTEM Rectifier 1. Remove the four screws holding the rectifier and the stator lead wires. 2. Remove the rectifier (1). (1) Rectifier W1136721 Rear End Frame 1. Unscrew the two nuts and two screws holding the drive end frame and the rear end frame.
Page 449 MX5100, WSM ELECTRICAL SYSTEM Bearing on Drive End Side 1. Press out the bearing from drive end frame (3) with a press and jig (1). (1) Jig (3) Drive End Frame (2) Block W1137587 Bearing at Slip Ring Side 1. Lightly secure the rotor (1) with a vise to prevent damage, and remove the bearing (2) with a puller (3).
Page 450: Servicing
MX5100, WSM ELECTRICAL SYSTEM [3] SERVICING (1) Starter Overrunning Clutch 1. Inspect the pinion for wear or damage. 2. If there is any defect, 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 451 MX5100, WSM ELECTRICAL SYSTEM 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. Brush holder – Resistance Infinity Holder support W1148701 Armature Coil 1. Check the continuity across the commutator and armature coil core with an ohmmeter.
Page 452: Alternator
MX5100, WSM ELECTRICAL SYSTEM (2) Alternator Bearing 1. Check the bearing for smooth rotation. 2. If it does not rotate smoothly, replace it. W1030850 Stator 1. Measure the resistance across each lead of the stator coil with an ohmmeter. 2. If the measurement is not within factory specification, replace it.
Page 453 MX5100, WSM ELECTRICAL SYSTEM Brush Wear 1. Measure the brush length with vernier calipers. 2. If the measurement is less than allowable limit, replace it. 3. Make sure that the brush moves smoothly. 4. If the brush is defective, replace it.
Page 454 MX5100, WSM ELECTRICAL SYSTEM 9-S34...

Kubota MX5100 Workshop Manual

General

1 Tractor Identification

2 General Precautions

3 Handling Precautions for Electrical Parts and Wiring

4 Lubricants, Fuel and Coolant

5 Tightening Torques

6 Maintenance

7 Check and Maintenance

8 Special Tools

9 Tires

Servicing

Mechanism

1 Travelling Clutch

2 Pto Clutch

Servicing

Mechanism

1 Structure

2 Power Train

3 Pto System

Servicing

Servicing

1 Troubleshooting

2 Tightening Torques

3 Checking, Disassembling and Servicing

Servicing

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Mechanism

1 Structure

2 Front Wheel Alignment

Servicing

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Mechanism

Servicing

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Mechanism

Servicing

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Mechanism

1 Wiring Diagram

2 Engine Starting System

3 Opc (Operator Presence Control) System

Servicing

2 Servicing Specifications

3 Tightening Torques

4 Checking, Disassembling and Servicing

Quick Links

Chapters

Troubleshooting

Related Manuals for Kubota MX5100

Summary of Contents for Kubota MX5100