HYDRAULICS – CX130/CX160
5 - 20
CX EXCAVATORS
SWING
Swing Lock
1) The swing-brake solenoid is activated allowing the spring-applied brake to fully apply.
2) The swing-shutoff solenoid is activated, hydraulically locking the swing spool.
3) This swing lock condition is maintained, even if the key switch is turned “OFF” and
“ON” again.
With the swing-brake switch ON, the swing brake is maintained and the swing control valve is
locked into the neutral position.
When the swing-brake switch on the control panel is switched ON, a signal is sent to the
controller. The controller sends 24v to energize the swing-brake solenoid valve. The valve
shifts and connects the swing-brake release circuit to tank and allows the brake to apply. The
controller also sends 24v to energize the swing shut-off solenoid valve. The valve shifts and
sends pilot pressure (550/600 psi) through a shuttle valve to both sides of the swing control
spool in the main control valve and hydraulically locks it in neutral. The swing-brake and
swing-shutoff solenoids are located in the six-solenoid valve bank, located in the pump
compartment. The swing shuttle valve is located behind the cab.
Swing Brake Solenoid
Pink Wire Band
Pilot Pressure Solenoid
Blue Wire Band
Swing Shutoff Solenoid
Green Wire Band
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