Komatsu WA380-6 Operation & Maintenance Manual page 227

TROUBLESHOOTING TROUBLESHOOTING
3. Turn starting switch to the ON position (B).
4. Move the parking brake switch to the ON (A) position
(actuated), then move it to the OFF (B) position (released).
The parking brake is released.
5. To restore the function of the parking brake, turn grip (2) of the
release valve clockwise to close the release valve, then turn
locknut (1) clockwise to lock it.
Tightening torque
Grip (2): 20 ± 5 Nm (2.0 ± 0.5 kgm, 14.5 ± 3.6 lbft)
Locknut (1): 20 ± 5 Nm (2.0 ± 0.5 kgm, 14.5 ± 3.6 lbft)
6. Move the parking brake switch to the ON (a) position. The
parking brake is applied.
To release the parking brake again, repeat the procedure in
Steps 1 to 4.
REMARK
If the brake accumulator pressure is low, the parking brake warning lamp may not go out and the alarm buzzer may
sound (a long continuous sound). If this happens, release the brake. For details, see "METHOD OF RELEASING
WITH ADJUSTMENT SCREW (PAGE 3-170)"
METHOD OF RELEASING WITH ADJUSTMENT SCREW
If the brake accumulator pressure is low, do as follows.
1. Loosen bolt (2) and adjustment screw (1) at 3 places (A, B, C)
at the front of the transmission case.
3 - 170
OPERATION OPERATION