Hydrostatic Transmission (Hst) - wsm STW37 Workshop Manual

STW34, STW37, STW40, WSM

(2) Hydrostatic Transmission (HST)

(1) Case
(2) Trunnion Shaft
(3) Variable Displacement Piston
Pump
(4) Input Shaft
(5) Output Shaft
(6) Fixed Displacement Piston
Motor
(7) Neutral Valve (Reverse)
(8) Neutral Valve (Forward)
Trunnion Wheel and 19T Gear
1. Remove the trunnion wheel mounting screw.
2. Remove the trunnion wheel while screw in the screw (M12 ×
Pitch 1.25 mm) to the screw hole (3).
3. Remove the 19T gear (1).
(1) 19T Gear
(2) Trunnion Wheel
Case Relief Valve
1. Remove the washer (3), spring (2) and poppet (1) after
removing the internal snap ring (4).
(When reassembling)
• Apply transmission oil to the poppet (1) before reassembling.
(1) Poppet
(2) Spring
(9) Case Relief Valve
(10) Valve Plate (Pump)
(11) Valve Plate (Motor)
(12) Charge Relief Valve
3-S53
TRANSMISSION
(13) Port Block
(14) Check and High Pressure
Relief Valve (Forward)
(15) Accumulator (for PTO Clutch)
9Y1211109TRS0044US0
(3) Screw Hole
9Y1211109TRS0045US0
(3) Washer
(4) Internal Snap Ring
9Y1211109TRS0046US0
KiSC issued 11, 2014 A