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Issue
1
Steer Unit Operation
- 4 Wheel Steer Machines
Crab Steer Mode
- Right Turn
The illustration shows the flow through the steering
unit in a right hand turn condition. The operation is
identical to that described for the 4 wheel steer
mod e, exc ep t t he st eer mod e c ont rol valve
X
directs the pressurised oil from the front power
track rod ram
40
to the other side of the rear power
track rod ram
41
, hence turning the rear wheels in
the same direction as the front wheels, causing the
machine to crab to the right.
Component Key:
A
Inner Spool
B
Outer Spool
D
Stator
LS
Load Sensing Port
X
Steer Mode Control Valve
40
Front Power Track Rod Ram
41
Rear Power Track Rod Ram
43B
Relief Valve
43C
Non-Return Valve
In crab steer mode the spools of the steer mode
control valve
X
are configured as shown.
4 -
14
4 -
14
Cir
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A395750