SERV1851 02/08
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Text Reference Electronic Control System
SWING BRAKE OPERATION Travel Speed Switch
Machine ECM
Soft Switch Panel
CAN Data Link Hydraulic Activation Switch
Fine Swing Switch Swing Brake Release Solenoid
Implement Pressure Switch
Hydraulic Activation Solenoid Fine Swing Solenoid 36
Swing Brake Operation This machine is equipped with a swing lock system that is controlled by the Machine ECM. The swing lock system control circuit provides control for the swing motor, swing brake, fine swing function, and back-up system of the machine. The swing brake solenoid is controlled by the implement pressure switch through the Machine ECM. When the implement pressure switch closes, the Machine ECM energizes the swing brake solenoid. When the implement pressure switch opens, the swing brake solenoid is de-energizes by the Machine ECM 6.5 seconds later. The de-energized swing brake solenoid allows the machine upper structure to come to a complete stop before the swing brake is engaged. The hydraulic activation lever must be in the activated (UP) position before the spring brake solenoid will energize. If the main back-up switch is placed in the Manual position, then the swing brake is electrically released. The fine swing function (optional) provides smooth start and stop operation during swing movement.
