5 - 19
Section C
Electrics
9803/6400
Section C
5 - 19
Issue 1
Pump Control
Swing Brake Swing Lock (continued)
(2) Swing Lock (Swing Lock Switch ON, 100% Brake)
When the swing lock switch is turned on
a. 24 V is output to the swing shut off solenoid (SOL:3) and the solenoid valve shifts. Pilot pressure enters both ends of the
swing section of the control valve, and the pilot pressure is then shut off instantly (spool of control V does not move).
b. After 5 seconds, 24V is output to the swing lock solenoid valve (SOL: 1) and the solenoid valve shifts. Oil within the brake
piston of the motor flows to the tank. The brake locks by torque at 100%.
c. Also 24V is output on the swing brake solenoid valve (SOL; 2) and the solenoid valve shifts.
SOL: 2
Swing Swing lock SOL:1 50% SOL: 3 Monitor
lever SW 100% lock brake Shut off ( P )
OFF
ON ON ON ( P )
5 sec. after lever
in neutral
ON
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