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
A
Pressure Line
B
Return Line
C
Pilot Line
D
Control Valve
E
Dipper Ram
F
Dipper (1)
G
Dipper (2)
H
Pump
Summary of Contents for JS70
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Page 189: ...Section E Section E Hydraulics 9803 6020 Issue 1 33 4 33 4 Control Valves Control Valve 291360...
