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Kubota B2150, B9200 - Hydrostatic Transmission

Kubota B2150, B9200 HST Transmission - Checking And Adjusting

Maximum Forward Speed

Depress the speed control pedal all the way in the forward direction, and measure the tractor speed. If the measurement is not within factory specifications, loosen the lock nut and adjust with the bolt. Maximum forward speed about 19 km/h 11.5 mph (Tire 8.3-24).

Maximum Reverse Speed

Depress the speed control pedal all the way in the reverse direction, and measure the tractor speed. If the measurement is not within the factory specifications, loosen the lock nut and adjust with the bolt. Maximum reverse speed about 15.2 km/h 9.5 mph (Tire 8.3-24).

Safety Switch Setting Position

Measure the distance between the clutch rod plate and the tip of the safety switch. If the measurement is not within the factory specifications, adjust it with the mounting nut. Distance between tip of safety switch and clutch rod plate - 10 to 12 mm 0.39 to 0.47 in.

Adjusting Neutral

Rotate the neutral adjuster counterclockwise so the rear wheels turn forward. Then rotate it clockwise until wheels stop completely. Put a mark on the clutch housing aligning the groove on neutral adjuster. Rotate the neutral adjuster clockwise so the rear wheels turn reverse. Then rotate it counterclockwise until wheels stop completely. Put a mark on the clutch housing aligning the groove on neutral adjuster. Hold the neutral adjuster so its groove is at the middle of the marks and tighten the screw. When the wheels tend to turn forward, rotate neutral adjuster clockwise. When the wheels tend to turn reverse, rotate neutral adjuster counterclockwise.

High Relief Pressure and Charge Relief Pressure

1 - HN tube, 2 - High pressure gauge, 3 - Low pressure gauge, 4 - Connector 3, 5 - Adaptor 1, 6 - Adaptor 3, 7 - Adaptor 2, 8 - Collar, 9 - Collar

Remove the joint screw LH and seal washer from the A port. Attach adaptor 3 (6) with collar (8) and seal washer to the A port. Remove the joint screw RH and seal washer from the B port. Attach adaptor 2 (7) with the collar (9) and seal washer to the B port. Attach the HN tube (1) and connector 3 (4) on adaptor 2 (7) and then a high pressure gauge (2) on the HN tube. Attach the HN tube (1) and connector 3 (4) on adaptor 3 (6) and then a low pressure gauge (3) on the HN tube. Fully engage parking brakes. Change the range selector lever to the Low position. Start the engine and run it at the maximum speed. Read the low pressure gauge (3) (right side) to measure the charge relief pressure. Then depress the speed control pedal forward and read the high pressure gauge (2) (left side) to measure the forward high relief pressure. Stop the engine and interchange the high pressure gauge (2) with the low pressure gauge (3). Start the engine and run it at the maximum speed. Depress rear of the speed control pedal and read the high pressure gauge (2) (right side) to measure the reverse high relief pressure. If the measurement is not within the factory specifications, replace the valve. Charge relief valve operating pressure - 490 to 686 kPa (71 to 99 psi).

Kubota B2150, B9200 HST Transmission - Disassembly And Reassembly

Neutral Holder

1 - Screw , 2 - Neutral Holder, 3 - Neutral Adjuster, 4 - Spring Holder, 5 - Neutral Holder Arm

Place parting marks on the neutral adjuster (3) and the neutral holder arm (5). Remove the screws and spring holder (4). Remove the screw, and neutral holder arm (5). Remove the screw (1) and pull out the neutral holder (2). Align the parting marks and install the neutral adjuster and the neutral holder arm.

Port Block

Remove the port block mounting screws, and tap the front of port block flange with a soft hammer to separate. Cover the splines of each shaft with thin tape to protect sealing lip. Install port block with gasket, О-ring and valve plate in place. Valve plates may stick to the port block but they are not fixed. Take care not to drop them.

Motor Cylinder Block

Hold the output shaft and tap the rear of case flange with a soft hammer slightly to separate motor cylinder block assembly. Remove internal snap ring retaining retainer plate of motor. Slide out motor cylinder block with pistons, retainer plate and internal snap ring. Check that internal snap ring faces correct direction, and install it to motor swashplate. Aligning the hole on swashplate to the dowel pin in the case, install output shaft assembly in the case.

Pump Cylinder Block

1 - Pump Cylinder Block, 2 - Retainer Plate, 3 - Piston, 4 - Internal Snap Ring

Remove internal snap ring (4) retaining the retainer plate (2) of pump. Slide out pump cylinder block (1) with pistons (3) retainer plate (2) and internal snap ring (4). Draw out the thrust plate from the variable swashplate. Check that internal snap ring (4) faces correct direction, and install it to pump swashplate. Squeeze the snap ring (4) and slip into the groove its arc first by pushing down with a screwdriver to fit surely.

Input Shaft

Remove the internal snap ring. Strike the end of the oil seal at three positions using a screwdriver, break it open at one place, and pry it off with the screwdriver. Tap out the input shaft.

Kubota B2150, B9200 Tractor - Hydrostatic Transmission Servicing

Input Shaft

Pull out the input shaft from the case. Check the seal surface, the bearing surface and the bearing. If the shaft is rough or grooved, replace. If the bearing is worn, replace.

Cylinder Block Bore and Pistons

Lift all the pistons gently with the retainer plate. Check the pistons for their free movement in the cylinder block bores. If the piston or the cylinder block bore is scored, replace cylinder block assembly. Do not interchange pistons between pump and motor cylinder block. Pistons and cylinder blocks are matched. Clearance between piston and bore - 0.02 mm (0.0008 in). Allowable limit - 0.04 mm (0.0016 in).

Piston Slipper and Retainer Plate

Check the slipper for flatness. If rounded, replace. Measure the thickness of piston slipper. If the measurement is less than the allowable limit, replace. Check the lubricant hole for clogging. Do not interchange pistons between pump and motor cylinder block. Pistons and cylinder blocks are matched. Thickness of slipper - 3.00 mm (0.118 in). Allowable limit - 2.90 mm (0.114 in).

Kubota B2150, B9200 HST - Transmission Case

Front Cover and Front Case Cover

Remove the range selector guide. Remove the front case cover. Remove the coupling. Remove the front cover.

1st Shaft and 2nd Shaft

1 - 2nd Shaft, 2 - 1st Shaft, 3 - 16T Gear, 4 - Bearing, 5 - Bearing, 6 - Bearing, 7 - 16T Gear, 8 - Bearing, 9 - Shim

Draw out the 2nd shaft (1), 16T gear (3), and bearing (4), (5) as a unit. Draw out the 1st shaft (2), bearing (6), 16T gear (7), bearing (8) and shim (9) as a unit. Install the 16T gear (3) so that its boss faces the bearing (4). Install the 16T gear (7) so that its boss faces the bearing (8).

6th Shaft

1 - External Snap Ring, 2 - 20T Gear, 3 - Shift Fork and Fork Rod, 4 - Bearing, 5 - Collar, 6 - Needle Bearing, 7 - Collar, 8 - 27T Gear, 9 - Collar, 10 - 24T Gear, 11 - 6th Shaft, 12 - Bearing

Remove the external snap ring(1), and draw out the 20T gear(2). Draw out the 6th shaft (11), bearing (4), collar (5), needle bearing (6), collar (7), 27T gear (8), collar (9), 24T gear (10) and bearing (12) as a unit with the shift fork and fork rod (3). Install the collars (5), (9) so that their oil grooves face the needle bearing.

Mid-PTO

Separate the mid-PTO case from the transmission case. After tapping the spring pin into the shaft, remove the shaft and the 27T gear. Remove the oil seal and the external snap ring. Draw out the 16T gear shaft with the bearing on it.

Kubota B2150, B9200 Hydrostatic Transmission - Differential Gear Case

Front Drive Shaft (4WD type only)

1 - Coupling, 2 - 16T Gear, 3 - 23T Gear, 4 - 3rd Shaft, 5 - External Snap Ring, 6 - Spiral Bevel Pinion Shaft, 7 - Bearing, 8 - External Snap Ring, 9 - 7th Shaft Front, 10 - Front Drive Shaft

Draw out the coupling (1) from the 3rd shaft (4). Draw out the front drive shaft (10) (4WD type only). Remove the external snap ring (8), and pull out the bearing (7). Draw out the 23T gear (3) from the front 7th shaft (9). Remove the external snap ring (5), and draw out the 16T gear (2) from the spiral bevel pinion shaft (6).

Bearing Support

Remove the bearing support mounting screws and nuts, and remove the bearing support with the shift fork. Bearing support mounting screw and nut - 16.7 to 19.6 Nm (12.3 to 14.5 ft-lbs).

3rd Shaft, 4th Shaft and Spiral Bevel Pinion Shaft

1 - Ball Bearing, 2 - Spiral Bevel Pinion Shaft, 3 - Shaft, 4 - 3rd Shaft, 5 - 4th Shaft, 6 - 29-16T Gear, 7 - Thrust Collar, 8 - Thrust Collar, 9 - Thrust Collar, 10 - Thrust Collar, 11 - Ball Bearing, 12 - 21T Gear, 13 - 24T Gear, 14 - 27T Gear, 15 - Ball Bearing

Pull out the bearing (1) from the spiral bevel pinion shaft (2). Draw out the 3rd shaft (4), 4th shaft (5) and 29-16T gear (6) with shift fork and shaft (3). Install the thrust collars (7), (8), (9), (10) to the 3rd shaft (4) so that their oil grooves face the needle bearing. Install the 4th shaft (5) so that the 27T gear (14) boss faces the bearing (15), the 24T gear (13) boss faces the bearing (15), and the 21T gear (12) boss faces the bearing (11).

PTO Shaft and 7th Shaft Rear

Remove the rear cover mounting screw. Remove the PTO shaft with rear cover. Draw out the 7th shaft rear from the differential gear case.

7th Shaft

1 - 7th Shaft Front, 2 - 27T Gear, 3 - Collar, 4 - Bearing, 5 - Coupling, 6 - 7th Shaft Middle, 7 - Coupling, 8 - 7th Shaft Rear

Draw out the 7th Shaft front (1), 27T gear (2), collar (3), bearing (4), coupling (5) and 7th shaft middle (6) as a unit.

Spiral Bevel Pinion Shaft

Remove the bearing holder mounting screws, and pull out the spiral bevel pinion shaft. Bearing holder mounting screw - 16.7 to 19.6 Nm (12.3 to 14.5 ft-lbs).

Differential

Remove the right and left differential bearing holders. Remove the differential assembly from the differential gear case. Install the differential bearing holders, noting the number of shims in the right and left differential bearing holders.

Kubota B2150, B9200 Tractor - Transmission Case and Differential Gear Case Service

Bearing Check

While holding the inner race, push and pull the outer race in all directions to check for wear and roughness. Apply transmission oil to the bearing and hold the inner race. Turn the outer race to check for smooth rotation of the race. For needle bearing, lay the needle rollers to check for any damage and wear.

PTO Shaft and 7th Shaft Rear

Remove the rear cover mounting screw. Remove the PTO shaft with rear cover. Draw out the 7th shaft rear from the differential gear case.

Backlash between Gear and Spline

Secure the shaft in a vise. Set a dial indicator (lever type). Move the gear by hand for measurement. If the measurement exceeds the allowable limit, replace it. Backlash between gear and spline - 0.030 to 0.078 mm (0.001 to 0.003 in). Allowable limit - 0.2 mm (0.008 in).

Gear Backlash

Set a dial indicator (lever type). Move the gear to measure the backlash, while holding the mating gear. If the measurement exceeds the allowable limit, replace it. Gear Backlash - 0.10 to 0.20 mm (0.004 to 0.008 in). Allowable limit - 0.4 mm (0.016 in). Dial indicator setting - Remove the front cover (1), and remove the shift fork and fork shaft. Replace the front cover, and set the PTO guide plate (2) on the top of the transmission case. Set the dial indicator (magnet base type) on the PTO guide plate.

Clearance between Shift Fork and Shift Gear Groove

Insert the fork into the shift gear groove and measure the clearance with a feeler gauge. If the clearance exceeds the allowable limit, replace it. Clearance between 24T gear and PTO shift fork - 0.10 to 0.30 mm (0.004 to 0.012 in). Allowable limit - 0.5 mm (0.020 in). Clearance between 16T-29T gear and shift fork - 0.10 to0.35 mm (0.004 to 0.014 in). Allowable limit - 0.5 mm (0.020 in). Clearance between 24T gear and PTO shift fork - 0.10 to 0.35 mm (0.004 to 0.014 in). Allowable limit - 0.5 mm (0.020 in).

Clearance between Gear and Shaft

Measure the gear I.D. with an inside micrometer, and then shaft O.D. with an outside micrometer. Measure the O.D. of two needles in the needle bearing with an outside micrometer. Clearance is the difference between the gear I.D. and the sum of shaft O.D. and two needle O.D. If the clearance is not within the factory specifications, replace it. Clearance between 12T gear and 3rd shaft - 0 007 to 0.053 mm (0.0003 to 0.0021 in). Allowable limit - 0.10 mm 0.0039 in. 3rd shaft O.D. - 21.987 to 22.000 mm (0.8656 to 0.8661 in). 12T gear I.D. - 27.007 to 27.028 mm (1.0633 to 1.0641 in). Needle O.D. - 2.494 to 2.500 mm (0.0982 to 0.0984 in). Clearance between 27T gear and 6th shaft - 0.009 to 0.059 mm (0.0004 to 0 0023 in). Allowable limit - 0.10 mm (0.0039 in). 6th shaft O.D. - 27.987 to 28.000 mm (1.1019 to 1.1024 in). 27T gear I.D. - 32.009 to 32.034 mm (1.2602 to 1.2612 in). Needle O.D. - 1.994 to 2.000 mm (0.0785 to 0.0787 in).

Turning Torque of Spiral Bevel Pinion Shaft

Secure the spiral bevel pinion shaft in a vise. Set a spring balance to the screw hole in the bearing holder. Pull the spring balance in the direction at a right angle to the center line of the spiral bevel pinion shaft to measure the turning load. If the turning load is not within the factory specifications, adjust with the staking nut on the spiral bevel pinion shaft. Turning torque of spiral bevel pinion shaft - 0.98 to 4.90 Nm (0.22 to 1.10 ft-lbs).

Backlash between Spiral Bevel Pinion and Spiral Bevel Gear

Set the dial indicator (lever type) with its finger on the tooth surface of bevel gear. Measure the backlash by fixing the spiral bevel pinion and moving bevel gear by hand. If the clearance exceeds the allowable limit, adjust with the shims at bearing holders. Adjust the backlash properly by repeating the above procedures. Backlash between spiral bevel pinion and spiral bevel gear - 0.10 to 0.20 mm (0.0039 to 0.0080 in). Apply red lead lightly over several teeth at three positions equally spaced on the bevel gear. Turn the spiral bevel pinion while pressing a wooden piece against the periphery of the bevel gear. Check the tooth contact if not proper, adjust according to the instructions below.

Kubota B2150, B9200 Dual Stage Clutch - Checking And Adjusting

Clutch Pedal Play

Depress the clutch pedal by hand, and measure the amount of pedal movement. If the measurement is not within the factory specifications, adjust the play by turning the rod. Clutch pedal play - 20 to 30 mm 0.79 to 1.18 in.

Clutch Pedal Traveling

Measure the distance between adjusting screw and stopper. If the measurement is not within the factory specifications, adjust it with the clutch adjusting screw. Distance between adjusting screw and stopper - 16 to 17 mm 0.63 to 0.67 in.

Safety Switch Setting Length

Measure the distance between the clutch rod plate and the tip of the safety switch. If the measurement is not within the factory specifications, adjust with the mounting nut. Distance between clutch rod plate and tip of safety switch - 25 to 27 mm 0.98 to 1.06 in.

Clearance between Pressure Plate 2 and Adjusting Screw

Remove the cover located on the right side of flywheel housing case. Loosen the lock nut, turn the adjusting screw by using 6 mm (0.24 in.) wrench until head of the screw contacts pressure plate slightly. Make 3/4 turn counterclockwise to give the clearance of factory specification. Tighten the lock nut, holding the adjusting screw. Clearance between pressure plate 2 and adjusting screw - 1.4 to 1.5 mm 0.055 to 0 059 in.

Kubota B2150, B9200 Tractor - Dual Stage Clutch Removing And Replacing

Removing Clutch

Insert the clutch center bar with the guide. Remove the mounting screws. Remove the clutch assembly with the clutch center bar. Be sure to align the center of disc (Travelling) and flywheel by inserting the clutch center tool with the guide. Do not allow grease and oil on the clutch disc facing.

Disassembling Clutch Assembly

1 - Clutch Disc (Traveling), 2 - Pressure Plate (Traveling), 3 - Release Lever, 4 - Belleville Spring, 5 - Clutch Cover, 6 - Clutch Disc (PTO), 7 - Pressure Plate (PTO), 8 - Belleville Spring, 9 - Clutch Cover

Draw out the joint pins and disconnect the release levers (3). Loosen the three clamping bolts evenly and remove them. Remove the clutch cover (9), belleville spring (8), pressure plate (7), and clutch disc (6) in order. Remove the clutch cover (5), belleville spring (4), and pressure plate (travelling) (2) in order. When assembling the clutch covers and pressure plates, be sure to align the parting marks to insure proper dynamic balance.

Clutch Rod and Clutch Release Fork

Remove the cotter pin at end of clutch rod. Draw out the clutch lever to remove the release fork. Remove the release spring and the bolt. Remove the release bearing and release hub as a unit. Make sure the direction of the release fork is correct. Inject grease to the release hub.

Kubota B2150, B9200 - Dual Stage Clutch Service

Backlash between Clutch Disc Boss and Shaft

Mount the PTO clutch disc to the propeller shaft 2. Hold the propeller shaft 2 so that it does not turn. Rotate the disc lightly and measure the displacement around the disc edge. If the movement exceeds the allowable limit, replace. Displacement around disc edge (PTO) (Allowable limit) - 2 mm 0.079 in. Perform measurement for the travelling clutch disc and the propeller shaft 1 in the same way as above. Displacement around disc edge (travelling) (Allowable limit) - 2 mm 0.079 in.

Release Bearing

1 - Belleville Spring, 2 - Release Bearing, 3 - Shim, 4 - Release Hub, 5 - External Snap Ring

Remove the belleville spring (1), release bearing (2) and shim (3) (if equipped) from the release hub (4) after taking off the external snap ring (5). Check for an abnormal wear on the contact surface of it. Hold the bearing inner race and rotate the outer race, while applying pressure to it. If the bearing rotation is rough or noisy, replace it. Set the belleville spring in the correct direction. Set the release bearing so that the working force of it is 78 to 118 N (8 to 12 kgf, 18 to 26 lbs) in the radial direction by adjusting with the shim (thickness: 0.2 mm, 0.079 in.).

Mutual Difference of Release Lever

Insert the clutch center bar and gauge ring with the guide. Measure the clearance between gauge ring and the top of adjusting screw with a feeler gauge. If the clearance is not within the factory specifications, adjust with the adjusting screws. Mutual difference of release lever - 0.0 to 0.2 mm 0.000 to 0.008 in.

Release lever Height

Mount the clutch on the clutch table with the clutch center bar and gauge ring. Adjust the height of the three release levers with the gauge ring. Measure the clearance between the gauge ring and the top of adjusting screw with a feeler gauge. If the clearance is not within the factory specifications, adjust with the adjusting screws. Clearance between gauge ring and the top of adjusting screw - 0.0 to 0.7 mm 0.000 to 0.028 in. Apply adhesive to the adjusting screws, replace lever and lock nuts.

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