HYDRAULICS – CX210/CX240
6 - 20
CX EXCAVATORS
SWING
Swing Lock
1) The swing-brake solenoid is energized allowing the spring-applied brake to fully apply.
2) The swing shut off solenoid is energized 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 a 24v signal 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. The six-solenoid
valve is 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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