jcb JS70 - Swing and Dipper in Simultaneous Operation

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Swing and Dipper In Simultaneous
Operation (Swing Priority)
When operating the swing and dipper simultaneously as
in bank shaving or cutting operations, swing priority is
achieved by using a restrictor regardless of the amount
of dipper work pressure in the dipper circuit.
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.
By selecting the swing spool and dipper spool,
pressurised oil is delivered to the swing and dipper
circuits respectively. The pressure difference in the
swing and dipper circuits caused by the swing priority
restrictor makes bank shaving and side cutting
possible.
Section E Hydraulics
9803/6020
Section E
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Issue 1
Schematics
A
Pressure Line
B
Return Line
C
Swing Motor
D
Control Valve
E
Hydraulic Pump
F
Dipper Ram
G
Swing Proirity Restrictor