56 - 4
Operation (cont’d)
3 Cushioned Mode - Remote Control Lever Moved
From ‘Dipper In’ to ‘Neutral’
a When dipper control lever 8 is set to neutral there is
no pilot pressure from the dipper remote control
valve. Spool Y returns to neutral.
b Left hand cushion spool Z also returns to neutral,
allowing pilot oil returning from the control valve via
port C to pass through orifice b. The cushion spool
moves further to the left side due to the pressure
differential across orifice b so that the pilot return oil
flows through and is restricted by orifice a.
c Due to this restrictive effect, the spool of dipper
control valve 1 only slowly returns to the neutral
(stop) position.
Section E Hydraulics
9803/6410
Section E
56 - 4
Issue 1
Cushion Valves
JS02040
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