Hydrostatic Transmission (Hst) - Kubota B1830 Workshop Manual

B1830,B2230,B2530,B3030, WSM

(4) Hydrostatic Transmission (HST)

Removing and Disassembling
Assembly
1. Remove the rear PTO shifter (23) from the PTO clutch shaft
(22).
2. Disassemble the mechanical PTO clutch assembly.
(When reassembling)
• Check the mechanical PTO clutch assembly parts the damage
and wear, replace it.
(1) Cir-clip
(2) Needle Bearing
(3) Thrust Ball Bearing
(4) Shifter (PTO ON/OFF)
(5) Clutch Spring
(6) Brake Plate
(7) Brake Plate 3
(8) Brake Disk
(9) Brake Plate 1
(10) One-way Clutch Spline Boss
(11) Cir-clip
(12) Thrust Collar
Separating Transmission Case
1. Disconnect the brake rods.
2. Disconnect the code bands from the wiring harness. Disconnect
the couplers from the HST neutral switch and the PTO neutral
switch. Separate the wiring harness from the transmission case.
3. Loosen the pipe bands.
4. Disconnect the hydraulic inlet pipe.
Disconnect the independent PTO valve delivery pipe.
Disconnect the hydraulic cylinder delivery pipe.
5. Hoist the transmission case and the main frame.
Support the transmission with a jack.
6. Remove the main frame mounting bolts.
7. Separate the transmission assembly from the main frame.
8. After separating the transmission, remove the rear wheels and
the transmission outer parts installed to the transmission.
(When reassembling)
• Tighten the transmission mounting bolts and nuts to the
specified torque.
Main frame mounting bolt
for aluminum (M12)
Main frame mounting nut
Tightening torque
for aluminum (M12)
Main frame mounting bolt
for ordinary material (M12)
(1) Nut
(2) Bolt
3-S43
TRANSMISSION
Mechanical PTO
(13) PTO Brake Spline Boss
(14) Needle Bearing
(15) Thrust Collar
(16) Cir-clip
(17) PTO Shifter
(18) 25T Mid PTO Gear
(19) Needle Bearing
(20) Collar
(21) Ball Bearing
(22) PTO Clutch Shaft
(23) Rear PTO Shifter
9Y1210003TRS0054US0
62.8 to 72.5 N·m
6.4 to 7.4 kgf·m
46.3 to 53.5 lbf·ft
62.8 to 72.5 N·m
6.4 to 7.4 kgf·m
46.3 to 53.5 lbf·ft
77.5 to 90.2 N·m
7.9 to 9.2 kgf·m
57.2 to 66.5 lbf·ft
(3) Main Frame
9Y1210003TRS0055US0
KiSC issued 05, 2012 A
Clutch