Power Steering Unit; Major Spec; Structure And Operation - Cub Cadet 8354 Service Manual

4. POWER STEERING UNIT

4.1 MAJOR SPEC.

Power Steering Unit
Volume
Relief pressure

4.2 STRUCTURE AND OPERATION

• Power steering controller consists of steering valve
and relief valve.
• Steering valve is divided into control valve and me-
tering device.
A. Control Valve
The control valve consists of control valve housing (9),
spool (2), and sleeve (5). The control valve is a rotary
type and keeps in neutral by centering spring without
valve control. If controlling the steering wheel, it takes
a role of converting oil inflow direction to steering cylin-
der with Gerotor.
(1) Needle Bearing
(2) Spool
(3) Pin
(4) Drive
(5) Sleeve
B. Metering Device
The metering device consists of a trochoid pump called
a Gerotor (6). Oil passes metering device from hydrau-
lic pump via the steering cylinder.
This metering device consists of a trochoid pump and
if driving rotor, oil will be discharged from three cham-
bers as volume changes between the rotor and stator.
It will passed to the rotor directly via steering shaft.
Therefore, the stator takes a role in passing oil to the
cylinder as it rotates. Then, steering wheel can be
steered as steering wheel is rotated.
If engine stops or hydraulic is pump faulty, stator en-
ables manual operation as a little engaged trochoid
pump.
D615-W02 May-2003
K&T Saw Shop 606-678-9623 or 606-561-4983
www.mymowerparts.com
51 cc/rev
120 kgf/cm²
8.4 psi
(6) Rotor
(7) Centering Spring
(8) Ball
(9) Housing
STEERING SYSTEM
(1) Relief Valve
(1) Rotor
(2) Stator
615W806A
(2) Steering Valve
615W807A
615W808A
(3) Plate
8-7