3 -28
Attachment - Dipper In
Pressurised oil from port A1 (front pump) enters port 5P
of the control valve. Pressurised oil from port A2 (rear
pump) enters port 4P of the control valve.
When operating dipper In with the left hand joystick, the
pilot pressurised oil flows to port 5Pa2 of the control
valve and switches arm spool (1).
Pilot pressurised oil flows to port 4Pa4 of the control
valve and switches dipper spool (2). The flow also
enters port Plc2 and releases the load holding valve.
When switching each spool, the pressurised oil from
port 4P and port 5P merge inside the control valve and
high speed is achieved.
Section E Hydraulics
9803/6020
Section E
3 - 28
Issue 1
Schematics
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