56 - 2
Operation
Whenever the machine ignition is first switched on, the
dipper and boom circuits default to the cushioned mode i.e.
solenoid valve 6 is de-energised.
The following descriptions deal only with the ‘dipper in’
function, but the ‘dipper out’, ‘boom in’ and ‘boom out’
circuits operate in exactly the same way.
1 Cushioned Mode - Remote Control Lever in Neutral
When the remote control lever is in neutral the hot oil
taken from the oil cooler line enters port R of cushion
valve 5 and flows through the centre of spool Y to
oilways e and f.
From oilways e and f, oil flows via the outer surface of
the cushion spools and returns to the hydraulic oil tank
via port T.
Section E Hydraulics
9803/6410
Section E
56 - 2
Issue 1
Cushion Valves
JS02020
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