Komatsu WA480-8 Operation & Maintenance Manual page 314

TROUBLES AND ACTIONS
8.
To restore the function of the parking brake, turn grip (3) of
the release valve clockwise to close the release valve,
then turn locknut (2) clockwise to lock.
Tightening torque
Grip (3): 20 ± 5 Nm {2.0 ± 0.5 kgm}
Lock nut (2): 20 ± 5 Nm {2.0 ± 0.5 kgm}
9.
Set the parking brake switch to ON position (A).
The parking brake is applied.
To release the parking brake again, repeat the procedure
in steps 1 to 7.
REMARK
If the pressure in brake accumulator is low, the parking brake caution lamp may not go out or the alarm
buzzer may sound (continuous beep). In this case, release the brake. For details, see "METHOD FOR RE-
LEASING PARKING BRAKE WITH BOLT (3-246)".
METHOD FOR RELEASING PARKING BRAKE WITH BOLT
1.
Remove plugs (1) and (2) in front of the transmission case.
2.
Remove 2 bolts among mounting bolts (3) (4 pieces), with
higher mounting seat (3 mm), being used for mounting the
parking brake chamber cover.
3.
Insert bolts (3) into the holes from which plugs (1) and (2) were removed.
Screw in the bolts evenly until they stop.
The parking brake is released.
(A): Plug mounting hole (M16: O-ring boss)
(B): Releasing screw hole (M12)
3-246
OPERATION