Swing Brake Operation
Five seconds after the swing brake lever is returned to
neutral, the swing mechanical brake is maintained at
50%.
When the swing lever is returned to neutral, the swing
spool returns to its neutral state so that the pressurised
oil from port
A1
(front pump) is intercepted and cannot
flow to the swing motor side. The return pressurised oil
is intercepted so that the integral crossover relief valve
in the swing motor is activated and the oil flows through
to the supply side. When the inertia of the main body is
lost, the swing stops.
During swing brake operation, the swing motor has
insufficient return oil. In order to supply the extra oil, port
T1
of the piping outlet return line is connected to port
Mu
on the swing motor.
A
Pressure Lines
B
Return Line
C
Swing Motor
D
Control Valve
E
Hydraulic Pump
F
Swing
3 - 16
Section E
Hydraulics
9803/6020
Section E
3 - 16
Issue 1
Schematics
Summary of Contents for JS70
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