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3 - 24
Attachment - Boom Down
Pressurised oil from port
A2
(rear pump) enters port
4P
of the control valve.
When operating boom down with the right hand joystick,
the pilot pressurised oil enters port
4Pa3
of the control
valve and switches boom spool
(1)
and pressurised oil
of port
4P
flows to the boom ram.
Pressurised oil enters port
PLc1
of the control valve and
releases the load holding valve. When the load holding
valve is released, the return oil from the boom ram flows
to the tank and boom down movement is executed.
Section E
Hydraulics
9803/6020
Section E
3 - 24
Issue 1
Schematics
A
Pressure Lines
B
Return Line
C
Pilot Line
D
Control Valve
E
Boom Ram
F
Boom (1)
G
Cushion Valve
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...