Hydraulics
9803/8500
Issue 2
Loader Valve - Crowd Ram
Operation
Bucket Lift (Crowd)
When the crowd ram spool 1 is selected for lift,
pressure acts on the crowd ram piston 2 and the
shovel 'crowds' or lifts. Oil from the other side of the
ram returns to the exhaust line via the control valve.
At the same time pressure is applied to the
compensating ram 3.
But since the lift ram 4 is locked, as the lift spool 5 is
not selected, no movement will result. Any cavitation
in lines 6 and 7 will be controlled by the A.R.V's 8.
Bucket Open
Is a reversal of this procedure.
5 - 5
5 - 5
Descriptions
Section E Section E
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