Operation Manual

BX25, RCK54(P)-23BX, RCK60B-23BX, LA240, BT601, WSM
STEERING
2. STEERING CONTROLLER
(4) (3)
3TAAAAB7P002A
=~§i]§~~_(5)
(3) __ +-1--....1'
(2)
(6)
(4)
3TAAAAF7P002A
A
(7)
3TAAAAB7P004B
The steering controller consists of a control valve (4)
and a metering device
(3).
• Control Valve
The control valve is a rotating spool type.
When the steering wheel is not turned, the position
of
the spool (7) and sleeve (9) is kept neutral by the
centering spring
(8). This causes the forming of a
"Neutral" oil circuit.
When the steering wheel is turned either clockwise
or
counterclockwise. the position of the spool and sleeve
changes in relation to the centering spring. This allows
the forming
of a "Right Turning" or "Left Turning" oil
circuit.
At the same time. the gear pump (Metering
device) rotates with the spool and sends the oil to the
cylinder corresponding to the rotation
of the steering
wheel.
•
Metering Device
Oil sent from the hydraulic pump to the steering
cylinder. passes through the metering device
(3).
Namely, when the rotor is driven. two chambers suck
in oil due to volumetric change in the pump chambers
formed between the rotor (12) and the stator (13). while
oil is discharged from other two chambers.
On the other
hand, rotation
of the steering wheel is directly transmitted
to the rotor through the spool
(7), drive shaft (10), etc.
Accordingly, the metering device 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 metering device functions as a manual
trochoid pump, which makes manual steering possible.
•
Relief Valve
The relief valve (1) is located in the steering
controller. It controls the maximum pressure
of the
power steering system.
Its setting pressure is as follows.
8.33
to 8.83 MPa
85 to 90 kgf/cm
2
1209 to 1280 psi
B
(1) Relief Valve
(10) Drive Shaft
(11 )
(2) Steering Controller
(11) Distributor Plate
~~
(3) Metering Device
(12) Rotor
(4) Control Valve
(13) Stator
(5) Steering Cylinder
(6) Check Valve
A : Control Valve
(10)
(7) Spool
B : Matering Divice
(8) Centering Spring
P : P
Port (From flow priority
(9) Sleeve
valve)
T : T Port (To
PTO clutch valve
and HST circuit)
W1012783
3TAAAAB7P005B
4-M2