Steering
9803/7130 Issue 1
Steer Unit Operation 2 - Left Turn
The illustration shows the flow through the steering
unit in a left hand turn condition. Turning the
steering wheel rotates the inner spool A a few
degrees relative to the outer spool B, and sends a
pressure signal to the relief valve 43B and through
the LS port back to the priority valve.
The relative movement between A and B directs
pressure oil through 6 of the 12 holes in the bottom
of sleeve B. The metering unit is linked to the
spools by a cross pin. As the steering is operated
the oil is diverted by inner spool A into the stator D.
The rotor lobes pump the oil out to the head side of
rear steering ram 41 turning the rear wheels to the
right. At the same time pressurised oil from the rod
side of steering ram 41 is fed to the rod side of
front steering ram 40, hence turning the front
wheels the required degree of left turn.
Component Key:
A Inner Spool
B Outer Spool
D Stator
LS Load Sensing Port
40 Front Steer Ram
41 Rear Steer Ram
43B Relief Valve
4 - 4
4 - 4
Circuit Description
Section H
Section H
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