Steering
9803/3280 Issue 1
Steer Unit Operation
- 4 Wheel Steer Machines
4 Wheel Steer Mode
- Shock Valve
In normal operation oil flow from the pump enters
the steering unit via the right hand port, opening a
spring-loaded non-return valve 43C. The flow is
directed by the steering unit to achieve the desired
turn (right hand shown).
In the event of a pressure shock wave being
generated in the system by an outside force, shock
valve 43A vents this pressure to exhaust preventing
damage to the steering unit.
Non-return valve J2 is held on its seat by the
generated pressure and non-return valve 43C
closes to prevent the shock wave being fed back to
the pump. Some of the excess flows via non-return
valve J1 to the opposite side of the power track rod
ram to prevent cavitation occuring.
Component Key:
A Inner Spool
B Outer Spool
D Stator
X Steer Mode Control Valve
J1 Non-Return Valve
J2 Non-Return Valve
43A Shock Valve
43C Non-Return Valve
4 - 10 4 - 10
Circuit Descriptions
Section H Section H
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