Cub Cadet 8404 - Manual (Page 217)

STEERING SYSTEM
8-7 D615-W02 May-2003
615W806A
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.
Power Steering Unit
Volume 51 cc/rev
Relief pressure 120 kgf/cm²
8.4 psi
4.1 MAJOR SPEC.
615W807A
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) Relief Valve (2) Steering Valve
(1) Needle Bearing (6) Rotor
(2) Spool (7) Centering Spring
(3) Pin (8) Ball
(4) Drive (9) Housing
(5) Sleeve
4. POWER STEERING UNIT
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.
615W808A
(1) Rotor (3) Plate
(2) Stator