Komatsu WA480-8 Operation & Maintenance Manual page 313

OPERATION
METHOD FOR RELEASING PARKING BRAKE WITH PARKING BRAKE EMER-
GENCY RELEASE VALVE
When the parking brake switch is OFF (released) and the parking brake emergency release valve is
opened, the parking brake is released instantly.
Under this condition, even if you feel danger and close the parking brake emergency release valve try-
ing to stop the machine, the parking brake does not work immediately.
If the pressure in brake accumulator is high, do as follows. (When the brake oil pressure caution lamp is not lit
while the key is turned to ON position.)
1.
Turn the starting switch to OFF position (A).
2.
Remove cover (1) in the back of the step on the right side
of the machine.
3.
Loosen lock nut (2) of the release valve by turning it coun-
terclockwise.
4.
Open the release valve by turning grip (3) counterclock-
wise.
REMARK
The release valve is located at the left front part inside the
rear frame and installed to the accumulator mounting
bracket.
5.
Turn the starting switch to ON position (B).
6.
Set the parking brake switch to ON position (A) (operated).
7.
Set to OFF position (B) (released).
The parking brake is released.
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CAUTION
TROUBLES AND ACTIONS
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