5 - 18
Section C Electrics
9803/6410
Section C
5 - 18
Issue 1
Pump Control
Swing Brake/Swing Lock (continued)
2) Engine is running and swing lever operation (brake release)
a In operating the swing lever, the signal of the pressure switch enters the controller, and the output to the swing brake
solenoid valve (SOL: 2) is turned OFF. Pilot pressure enters directly, and the brake is fully released.
b In returning the swing lever to neutral, the signal of the pressure switch goes OFF. The computer then outputs 24V on the
swing brake solenoid valve (SOL: 2) and after the 5 seconds delay the brake operates at 50%.
SOL: 2
Swing Swing lock SOL:1 50% SOL: 3 Monitor
lever SW 100% lock brake Shut off ( P )
OFF OFF OFF
ON OFF
ON OFF OFF OFF OFF
OFF OFF OFF OFF
5 sec. after lever
in neutral
ON
a
b
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