309
M6.0-1055-001
01 Rev. 11/08
STEERING
Steering
Steering
Your truck is equipped with a hydraulic steering sys-
tems. A hydrostatic steering control unit, located in the
power unit, is coupled via hydraulic hoses to the steer-
ing motor, mounted on the axle housing, used to actu-
ate the steering.
Hydrostatic Steering Unit
The hydrostatic steering unit (open center non-reac-
tion) mounts in the power unit below the steering tiller.
The non-reaction unit maintains the steered position
when the operator releases the steering tiller. Cylinder
ports are blocked in the neutral valve position. The op-
erator must steer the drive wheel back to the straight
ahead position.
The steering unit meters a proportional amount of oil to
the steering motor when the tiller is rotated. This pres-
surized oil is supplied by P1 pump, and is supplied to
the appropriate side of the steering motor by the direc-
tion of rotation of the steering control unit via the steer-
ing tiller. When the steering tiller rotation is stopped,
the steer motor ports are blocked to hold the steering
in that position. In the event the pump flow is stopped,
the steer unit can be manually rotated to "pump" flow to
the appropriate motor port by turning the steering tiller
in the desired direction, thus allowing emergency
steering.
Steer circuit relief pressure is non-adjustable and pre-
set 11,031 kPa (1600 psi).
Forward and Reverse Steering
Steering on your truck can be changed from forward
steering the reverse steering by reversing the hydraulic
lines at the steer motor. Care should be exercised
when maintenance is performed on the steering sys-
tem to return the truck to the proper steering mode
upon completion.
Prior to disassembly the service technician should de-
termine the steer direction of the truck, upon comple-
tion of the maintenance, steer direction should be
checked to insure that it is set for the desired direction
and functioning properly.
Steer Tire
When replacing the steer tire, make sure the composi-
tion and size are such that maneuverability, stability
and braking requirements are maintained. Both steer
tires should be replaced at the same time to maintain
equal tire circumference.
The steer tire is a "press-on" type; press the old tire off
the hub and press new tire on. The outside of the hub
should be flush with the outside edge of tire.
Crown 2007 PF15713-1 Rev. 11/08
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