Cub Cadet 8454 Service Manual page 246

CHAPTER 6 8454
2. Metering installation oil delivered from the hydrau-
lic pump to the steering cylinder passes this meter-
ing installation. The metering installation composed
of the trochoid pump, while absorbing oil at 3 rooms,
sends out oil at different 3 rooms according to the
capacity change of the pump room made up be-
tween the rotor and the GEROTOR if the rotor gets
started. Meanwhile, to the rotor, oil is directly deliv-
ered via the steering shaft for turning of the steering
wheel. Consequently, the GEROTOR transmits cor-
responding amount of oil to the turning to the steer-
ing cylinder. By this operation, the direction of
wheels can be controlled as much as the angle
corresponding to the turning degree of the steering
wheel. In case the engine stops or the hydraulic
pump gets in error, manual control of the direction
is allowable because the gerotor can be operated
as a little engaged trochoid pump.
C. OPERATION
a . Hydraulic Circuit for Power Steering System
1. Power steering pump (3), driven by the engine sucks
oil from transmission case (1), and it to steering
controller (5) through the hose.
2. The oil which has entered steering controller (5) is
directed to control valve (6). As the steering wheel
is turned, control valve (6) operates and oil passes
through GEROTOR (7) and into steering cylinder
(8). The cylinder rod them moves to control the di-
rectional movement of the front wheels.
3. Return oil from steering cylinder (8) passes through
control valve (6) and back into transmission case
(1).
4. When the engine is not operating, and the steering
wheel is turned GEROTOR (7) rotates to supply oil
in the pipe to steering cylinder (8).
Thus the machine can be steered manually. Under
this condition check valve (9) opens and oil return-
ing from the steering cylinder which would other-
wise return to transmission case (1) flow to the pipe
leading to the hydraulic system.
6-52
K&T Saw Shop 606-678-9623 or 606-561-4983
www.mymowerparts.com
(1) Rotor
(2) Stator
(1) Transmission Case
(2) Oil Filter
(3) Power Steering Pump (8) Steering Cylinder
(4) Relief Valve
(5) Steering Controller
569W665A
(3) Plate
569W666A
(6) Control Valve
(7) GEROTOR
(9) Check Valve
D569-W02 May-2003