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Kubota B5100, B5200 - Mechanical Transmission

Kubota B5100, B5200 Tractor - Six-Speed Transmission

1.Knob, 2.Shift lever, 3.Cover, 4.Snap ring, 5.Spring, 6.Bushing, 7.Check plate bolt, 8.O-ring, 9.Gasket, 10.Rod guide pin, 11.Shift cover, 12.Check plate, 13.Washer, 14.Castle nut, 15.Cotter key, 16.Pin, 17.Shift fork, 18.Ball, 19.Spring, 20.Cotter key, 21.Rail, 22.O-ring, 23.Tab washer, 24.Cap screw, 25.Rail, 26.Shift fork, 27.Ball, 28.Spring, 29.Lever, 30.O-ring, 31.Plate, 32.Grip, 33.Range shift lever, 34.Pin, 35.Rail, 36.Shift fork, 37.Ball, 38.Spring, 39.Cotter key, 40.Lever, 41.O-ring, 42.Plate, 43.Front-wheel drive select lever, 44.Grip, 45.Pin, 46.Plug, 47.Cover plate

Main shift lever (2) selects gear positions through an H-pattern. When range shift lever (33) is placed in the low range position (up position), reverse one and forward one, two and three are attainable. When range shift lever (33) is placed in the high range position (down position), reverse two and forward four, five and six are attainable.

Kubota B5100, B5200 - Clutch housing/Transmission Case Split

Drain transmission/hydraulic system fluid into a suitable container. Raise hood and disconnect battery cable from negative battery post. Remove air cleaner assembly and right side cover. Disconnect throttle linkage. Close fuel shut-off valve at fuel filter, then disconnect fuel supply line from fuel pump. Remove line connecting fuel tank to fuel filter at filter port and plug openings to prevent fuel spillage. Remove fuel filter assembly. Detach hydraulic lines as needed. Remove bolts and nuts connecting step plates to fenders.

Detach brake pedal rod and differential lock rod from under step plate. If so equipped, disconnect flasher lamp wiring at rear fenders. Support rear of tractor. Attach a hoist with suitable holding fixtures to clutch housing. Remove nuts securing clutch housing to transmission case, then separate components. Reassembly is reverse order of splitting procedure. Tighten nuts securing clutch housing to transmission case to 61-107 Nm (45-79 ft-lbs.) torque. Capacity of transmission/hydraulic system is 8.5 liters (2.21 gal.) or 11.5 liters (3 gal.). Refill with the following transmission/hydraulic fluid or a suitable equivalent.

Kubota B5100, B5200 Transmission - Remove And Reinstall

1. Cap, 2. Snap ring, 3. Bearing, 4. Bushing, 5. Thrust washer, 6. Gear, 7. Needle bearings, 8. Spacer, 9. Thrust washer, 10. Reverse shaft, 11. Shim, 12. Thrust washer, 13. Needle bearing, 14. Snap ring, 15. Oil seal, 16. Bearing, 17. Input shaft, 18. Bearing, 19. Spacer, 20. Bearing, 21. Gear, 22. Gear, 23. Snap ring, 24. Gear, 25. Fourth shaft, 26. Bearing, 27. Snap ring, 28. Gear, 29. Bearing, 30. Snap ring, 31. Bearing, 32. Second shaft, 33. Spacer, 34. Gear, 35. Gear, 36. Shim, 37. Thrust washer, 38. Bearing, 39. Shim, 40. Spacer, 41. Bearing, 42. Bushing, 43. Spacer, 44. Snap ring, 45. Gear, 46. Spacer, 47. Stop collar, 48. Bearing, 49. Bearing, 50. Bevel pinion gear, 51. Cap screw, 52. Washer, 53. Washer, 54. Bearing, 55. PTO-gear, 56. Spacer, 57. Bearing, 58. Spacer, 59. Bushing, 60. Shim, 61. Shim, 62. Spacer, 63. Oil seal, 64. Pto shaft, 65. Snap ring, 66. Bearing, 67. Gear, 68. Third shaft, 69. Thrust washer, 70. Bearing, 71. Snap ring, 72. Coupling, 73. Snap ring, 74. PTO drive shaft, 75. Bearing, 76. Gear, 77. Snap ring, 78. Bearing

Split clutch housing from transmission case. Remove shift cover (11) as an assembly with shift components. Remove hydraulic lift covers. Remove cap screws and nuts securing gear transmission case to center housing. Separate assemblies, then withdraw transmission assembly while being careful not to allow any component to fall free. Installation is reverse order of removal. Tighten cap screws and nuts securing transmission to center housing to 39-43 Nm (29-32 ft-lbs.) torque. Install shift cover assembly.

Kubota B5100, B5200 Tractor - Differential lock

1.Center housing, 2.Differential case, 3.Differential lock cam, 4.Bull pinion gear, 5.Spring, 6.Fork, 7.Engagement rod, 8.Shim, 9.O-ring

Differential lock assembly mounts in right axle case housing. To service differential lock components, remove right axle case assembly. Separate differential lock components. Inspect all components for excessive wear and damage. Make sure engagement teeth on cam (3) and differential case (2) engage properly and are not chipped, cracked or damaged in any other way. Measure free length of differential lock spring (5), reference value is 40 mm (1.5748 inches). Renew all parts as needed. Reassembly is reverse order of disassembly. Reinstall right axle case assembly. Adjust differential lock pedal travel to a length of 28 mm (1.1024 inches).

Kubota B5100, B5200 - Power Take-Off

Two rear PTO speeds are available on Models B5100 and B5200. Power take-off second and third speed ranges should never be used except when following the implement instructions. When PTO select lever is placed in first speed range, rear PTO shaft will rotate at a speed of 603 rpm when engine speed is set at 3000 rpm. When Power take-off select lever is placed in second speed range, rear PTO shaft will rotate at a speed of 963 rpm when engine speed is set at 3000 rpm.

Rear PTO

1.Transmission case, 2.Center housing, 3.Shift rail, 4.Shift fork, 5.Ball, 6.Spring, 7.Rod, 8.Thrust washer, 9.Needle bearings, 10.Gear, 11.Thrust washer, 12.Gasket, 13.Lock screw, 14.Tab washer, 15.Shaft, 16.Cap, 17.Oil seal, 18.Cover plate, 19.Gasket, 20.Bearing, 21.Shaft and gear, 22.Bearing, 23.Mid-PTO case, 24.Gasket, 25.Drain plug, 26.Dowel pin, 27.Lever, 28.O-ring, 29.Plate, 30.Select plate, 31.Select lever, 32.Pin, 33.Grip, 34.One-way clutch, 35.Snap ring, 36.Spring, 37.Bushing, 38.PTO drive shaft, 39.Bearing, 40.PTO drive gear, 41.Snap ring, 42.Bearing, 43.Cap screw, 44.Washer, 45.Washer, 46.Washer, 47.Bearing, 48.PTO gear, 49.Spacer, 50.Bearing, 51.Spacer, 52.Bushing, 53.Shim, 54.Rear cover, 55.Seal, 56.PTO output shaft, 57.Cap, 58.Shim, 59.Spacer, 60.Coupler, 61.Gasket, 62.Collar, 63.Spacer

To remove power take-off components located in center housing, first remove the six cap screws securing rear cover (54) to center housing (2). Using a suitable mallet, lightly tap rear cover (54) to separate components, then withdraw rear cover assembly. Using a suitable puller, extract bearing (42) from shaft end (38). Remove snap ring (41), then withdraw gear (40). To remove shaft (38), remove hydraulic lift cover. Using a suitable mallet, lightly tap shaft rearward to break bearing (39) loose from center housing bore, then extract shaft. Note coupler (60). Remove all components as needed that will obstruct in center housing and transmission case split.

Using suitable holding fixtures, support center housing and transmission case, then split units apart. Remove snap ring (35) and withdraw one-way clutch half (34) and spring (36). Lightly tap front end of shaft (38) to dislodge bearing (39) from center housing bore, then extract shaft. Inspect components and renew any which are damaged or excessively worn. Installation is reverse of removal. Tighten cap screws securing center housing to transmission case to 19-32 Nm (14-24 ft-lbs.) torque and nuts to 25-39 Nm (18-29 ft-lbs.) torque.

Kubota B5100, B5200 - Rear Axle Differential and Bevel Gears

1.Differential case, 2.Bevel ring gear, 3.Bearing, 4.Shim (left), 5.Shim (right), 6.Lock plate, 7.Knock pin, 8.Retaining pin, 9.Cross-shaft, 10.Side gear, 11.Bushing, 12.Thrust washer, 13.Thrust washer, 14.Spider gear, 15.Thrust collar

Disconnect and remove differential lock and brake rods. Remove control rod from control valve actuating lever. Remove three cap screws retaining control valve to lift cover, then separate components being careful not to drop the two O-rings. Remove bracket mounted to lift cover cylinder head. Remove top link bracket at rear of lift cover. Remove the nine cap screws securing lift cover to center housing, then tap lift cover upwards using a suitable mallet. Note that lift cover must be lifted upward because of dowel pins located in center housing. Remove the ten cap screws retaining left and right axle case assemblies to center housing. Tap axle shaft with a suitable mallet to break components apart, then carefully extract assemblies. Remove left and right differential bearing holders and withdraw shims (4 and 5). Lift out differential and bevel ring gear assembly from center housing.

Installation is reverse order of removal. Renew all gaskets and O-rings. Backlash between bevel ring gear and bevel pinion should be 0.1-0.2 mm (0.004-0.008 inch) with an allowable limit of 0.4 mm (0.016 inch). Adjust by varying thickness of shim (4 or 5) until recommended backlash is attained. Tighten cap screws securing left and right axle case to center housing to 48-56 Nm (35-41 ft-lbs.) torque for M10 cap screws and 77-90 Nm (57-67 ft-lbs.) torque for M12 cap screws. Tighten cap screws securing lift cover to center housing to 25-29 Nm (19-22 ft-lbs.) torque. Tighten cap screws mounting top link bracket to lift cover to 41-47 Nm (30-35 ft-lbs.) torque. Adjust differential lock control rod. Adjust brake pedal free play.

KUBOTA TRACTORS TROUBLESHOOTING
L235	L2501	L2550	L275	L3110
L3301	L35	L3710	L3901	L4310
L5030	M4700	M5700	M6040	M6800
M8200	M8540	M9000	MX5100	MX5200