33 - 10
Slew Operation (SW) Priority Circuit
(cont’d)
When pilot pressure is applied to port al1, by operating the
left hand joystick controller, the spool C moves to allow oil
from pump P1 to lift the check valve F and enter outlet port
AL1.
When the slew and dipper spools are operated
simultaneously, the main flow of oil from pump P1 opens
check valve F and operates the slew motor. Oil also passes
through a restrictor G and is directed via the parallel gallery
to the dipper ram, thus ensuring priority oil feed to the slew
motor. Oil flowing from pump P2 passes through the high
pressure gallery into the open port of the dipper spool to
combine with the flow from pump P1. Oil returns to tank via
port AL3.
Section E Hydraulics
9803/6410
Section E
33 - 10
Issue 1
Control Valve
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