wsm L503 Workshop Manual page 204

L3130 · L3430 · L3830 · L4630 · L5030, WSM
(D) Operation
Neutral
(1) Transmission Case
(2) Filter
(3) Input Shaft
(4) Charge Pump
(5) Pump Cylinder
(6) Variable Swashplate
The sucked oil from the transmission case (1) by the charge pump (4) flows into the HST housing (13) and regulator
valve (7) through the oil filter (16) and charge relief valve (18). Overflow oil from HST housing (13) flows to the suction
line through the oil cooler (15).
When the HST pedal (10) is in neutral, regulator valve (7) is not activated, so the variable swashplate (6) is at right
angle to the pump pistons and they only rotate with cylinder (5) without reciprocation. Since the oil is not being
pumped to motor, the cylinder block in the motor (20) is stationary and the output shaft (21) does not rotate.
(7) Regulator Valve Assembly
(8) Servo Piston
(9) Feedback Lever
(10) HST Pedal
(11) Regulator Valve
(12) Bypass Pipe
(13) HST Assembly
(14) Main Circuit and Steering
Circuit
(15) Oil Cooler
(16) Filter
(17) Case Relief Valve
3-M30
TRANSMISSION
(18) Charge Relief Valve
(19) PTO Clutch Valve Circuit
(20) Motor Cylinder
(21) Output Shaft
(22) Check and High Pressure
Relief Valve
KiSC issued 02, 2007 A