Oil Flow - wsm L503 Workshop Manual

L3130 · L3430 · L3830 · L4630 · L5030, WSM

[4] OIL FLOW

Neutral Position
When the steering wheel (1) is not being turned, valve
plate (2) is held in the neutral position by centering
spring. Under this condition, an oil passage is formed
between P port (from pump) and T port (to transmission
case) in the control valve, and all oil from the hydraulic
pump flows to T port.
(1) Steering Wheel
(2) Valve Plate
(3) Gerotor
(4) Steering Cylinder
(5) Steering Controller
(6) Relief Valve
Right Turn
When the steering wheel is turned to the right, the
action is transmitted through the drive plate, gerotor, and
drive link to the control valve. Valve plate (2) then rotates
to the right on manifolds, located on the opposite faces
of the valve plate (2). Thus, the P port passage in the
control valve is connected with gerotor (3).
The stator of gerotor (3) turns by the amount
corresponding to the turn of the steering wheel (1), and
the gerotor performs the metering function and lets oil
through it, the amount of which corresponds to the turn
of the steering wheel (1).
The oil which has passed through gerotor (3) flows
back to the control valve, in which it is directed to cylinder
port R to operate steering cylinder (4). Consequently,
the front wheels are moved to the right through the angle
corresponding to the amount of the oil.
When steering cylinder (4) operates, oil returning to
cylinder port L flows back to the transmission case
through the passage connected to T port in the control
valve.
(1) Steering Wheel
(2) Valve Plate
(3) Gerotor
(4) Steering Cylinder
(5) Steering Controller
(6) Relief Valve
7-M7
STEERING
P : Pump Port
T : Tank Port
R : Cylinder Port R
L : Cylinder Port L
W1013515
P : Pump Port
T : Tank Port
R : Cylinder Port R
L : Cylinder Port L
W1013646
KiSC issued 02, 2007 A