S0709730K
Page 3
Power Steering Unit
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GENERAL DESCRIPTION
POWER STEERING SYSTEM
Power Steering Unit.
The machine contains a fully hydraulic steering unit. See Figure 1. Rotating the steering wheel controls
hydraulic flow through the steering valve. Figure 2, shows the hydraulic schematic for the steering system.
The steering valve meters the volume of pump flow that is supplied to the steering cylinders
The steering unit contains a gerotor. This allows
the operator to steer the machine when the
engine is not running or when the steering pump
has failed. The gerotor functions as a manual
hydraulic pump that is powered by the rotation
of the steering wheel. Rotating the steering
wheel will cause the gerotor to draw oil from the
hydraulic tank and send this oil to the steering
cylinders.
The shaft that is rotated by the steering wheel is attached to the spool (8, Figure 1) by the engagement of
a spline. The spool is surrounded by a sleeve (3). The spool and sleeve are connected by the centering
spring (2). At the steering wheel neutral position, the center pin does not contact the spool. A drive shaft
(9) extends through the spool. The upper end of the drive shaft engages the center pin (4). The lower end
of the drive shaft engages the spline in the gerotor (6).
Reference
Number
Description
1 Bearing
2 Centering Springs
3 Sleeve
4 Center Pin
5 Check Valve
6 Gerotor
7 End Cap
8 Spool
9 Drive Shaft
10 Housing
Figure 1
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