wsm L3301 Workshop Manual page 299

L3301, L3901, L4701, WSM
Neutral
(1) Transmission Case
(2) Filter
(3) Input Shaft
(4) Hydraulic Pump
(5) Power Steering Circuit
(6) Variable Swashplate
(7) Servo Piston
(8) Feedback Lever
The sucked oil from the transmission case (1) by the charge pump (17) flows into the HST assembly (13) and the
regulator valve (9) through the oil filter (19) and the charge relief valve (18). Overflow oil from HST assembly (13)
flows to hydraulic pump (4) through the oil cooler (15).
When the HST pedal (10) is in neutral, regulator valve (9) is not activated, so the variable swashplate (6) is at
right angle to the pump pistons and they only rotate with the pump cylinder block (14) without reciprocation. Since the
oil is not being pumped to motor, the cylinder block in the motor cylinder block (21) is stationary and the output shaft
(22) does not rotate.
(9) Regulator Valve Assembly
(10) HST Pedal
(11) Spool
(12) Bypass Pipe
(13) HST Assembly
(14) Pump Cylinder Block
(15) Oil Cooler
3-M25
(16) Case Relief Valve
(17) Charge Pump
(18) Charge Relief Valve
(19) Oil Filter
(20) PTO Clutch Valve Circuit
(21) Motor Cylinder Block
(22) Output Shaft
TRANSMISSION
(23) Check and High Pressure
Relief Valve
(24) PTO Clutch Pressure Priority
Valve
W: High Pressure Oil
X: Low Pressure Oil
Y: Free Oil
Z: Suction Oil
9Y1211012TRM0026US0
KiSC issued 09, 2016 A