56 - 3
Operation (cont’d)
2 Cushioned Mode - Remote Control Lever to ‘Dipper
In’
a Pilot pressure enters port A of cushion valve 5 from
dipper remote control valve 8. The left hand cushion
spool Z and spool Y both move to the right.
b The pilot pressure to the cushion spool enters
oilway g through the centre of the spool. It passes
spool Y outer surface and enters the dipper control
valve via port C.
c The pilot return oil from the dipper control valve
enters oilway f via port D and the outer surface of
spool Y. From oilway f it passes the cushion spool
outer surface and returns to the hydraulic oil tank
port T.
d Oilways e and f are shut off by the movement to the
right of spool Y. This causes hot oil to flow from
port R through oilway h to orifice c. Thence it flows
via port B to the dipper control valve which warms
up.
Section E Hydraulics
9803/6410
Section E
56 - 3
Issue 1
Cushion Valves
JS02030
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