wsm L4701 User Manual

STEERING
L3301, L3901, L4701, WSM
7-M7
[4] STEERING CONTROLLER
The steering controller mainly consists of a control
valve, a metering device and a relief valve.
The metering device comprises a set of special
gears called "Gerotor".
9Y1211012STM0012US0
(1) Control Valve
The control valve is a rotating spool type. When the
steering wheel is not turned, the valve is kept in the
neutral position by the centering spring (3).
Then, the oil flow from the hydraulic pump to the
steering cylinder and from the steering cylinder to the
transmission case is stopped. Oil from the hydraulic
pump is sent to the transmission case through the
control valve.
When the steering wheel is turned clockwise or
counterclockwise, the control valve, together with the
gerotor, changes the direction of oil flow to the steering
cylinder according to the direction, the steering wheel
was turned.
9Y1211012STM0013US0
(2) Metering Device (Gerotor)
All oil sent from the hydraulic pump to the steering
cylinder, passes through the metering device (Gerotor).
Namely, when the rotor is drive, three chambers suck in
oil due to volumetric change in the pump chambers
formed between the rotor (2) and the stator (3), while oil
is discharged from other three chambers. On the other
hand, rotation of the steering wheel is directly
transmitted to the rotor through the steering shaft, spool,
drive shaft, etc..
Accordingly, the gerotor serves to supply the
steering cylinder with oil, amount of which corresponds
to the rotation of the steering wheel. The wheels are thus
turned by the angle corresponding to the rotation of the
steering wheel.
When the engine stops or the hydraulic pump
malfunctions, the gerotor functions as a manual trochoid
pump, which makes manual steering possible.
9Y1211012STM0014US0
(1) Dowel Pin
(2) Check Valve
(3) Gerotor
(4) Housing
(5) Bearing Assembly
(6) Centering Spring
(7) Sleeve
(8) Spool
(9) Centering Spring
(1) Dowel Pin
(2) Spool
(3) Centering Spring
(4) Sleeve
(1) Drive Plate
(2) Rotor
(3) Stator
KiSC issued 09, 2016 A

wsm L4701 Specifications

General

Brand	wsm
Model	L4701
Category	Tractor
Language	English