56 - 5
Operation (cont’d)
4 Non-Cushioned Mode
When cushion switch 2 is switched ON, solenoid valve
6 is energised and pilot pressure 39.2 bar (40 kgf/cm
2
)
is fed to port S of cushion valve 5.
The two cushion spools Z are forced into the centre by
pilot pressure so that the unrestricted oilways of the
cushion valve spools are open to the pilot outputs from
dipper remote control valve 8.
The hot oil from port R returns to the hydraulic oil tank
via port T when dipper remote control lever 8 is at
neutral.
When the dipper remote control is operated, pilot
pressure from the lever to port A is fed via the left hand
cushion valve and port C directly to dipper control valve
1. At the conclusion of lever operation the returning
pilot oil goes straight back to the lever, i.e. there is no
cushioning.
Section E Hydraulics
9803/6410
Section E
56 - 5
Issue 1
Cushion Valves
JS02050
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