Hydraulic Circuit For Power Steering; Hydraulic Pump - wsm STW37 Workshop Manual

STW34, STW37, STW40, WSM

2. HYDRAULIC CIRCUIT FOR POWER STEERING

When the engine starts, the hydraulic pump (12)
pressurize oil from transmission case through the
regulator valve (10) and send the oil, to the steering
controller (3).
The oil which has entered steering controller (3) is
directed to control valve (2).
When the steering wheel is turned, control valve (2)
operates and send oil through gerotor (4) to steering
cylinder (5). The cylinder rod of steering cylinder (5)
moves the direction of front wheels.
Return oil from steering cylinder (5) passes through
control valve (2) and is sent to the HST.
When the engine is not operating, and the steering
wheel is turned, gerotor (4) rotates to supply oil to
steering cylinder (5). Thus the direction of front wheel
can be controlled manually.
(1) Steering Wheel
(2) Control Valve
(3) Steering Controller
(4) Gerotor
(5) Steering Cylinder
(6) Relief Valve
(7) Check Valve
(8) Regulating Valve
(9) Pressure Reducing Valve
(10) Regulator Valve
(11) Oil Filter

(12) Hydraulic Pump

(Power Steering)
(13) Hydraulic Pump (3P)
7-M2
STEERING
a: To 3P Hydraulic System
b: To HST
c: To Bi-speed Valve
d: From Oil Cooler
9Y1211109STM0002US0
KiSC issued 11, 2014 A