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MAINTENANCE
ADJUST PARKING BRAKE
When carrying out the adjustment, raise the air pressure high enough to prevent the parking brake from being applied
automatically, and hang a warning sign on the parking brake valve lever to prevent any other person from operating it.
Never put any oil or grease on the surface of the pad or disc.
If the parking brake effect is poor, adjust as follows.
1. Check that the brake oil pressure caution lamp is turned OFF
(the brake accumulator pressure is sufficiently high), and then
release the parking brake.
2. Turn bolt (1) counterclockwise and bring in the pad into tight
contact with the disc.
3. Turn bolt (1) clockwise by 240° ± 15°(turn by 2/3 turn).
Measure the thickness of the pad, and if it is less than 1.5 mm (0.06
in), contact your Komatsu distributor to have it replaced.
When making an adjustment for the first time after replacing the
pads, turn bolt (1) counterclockwise by 360° ± 15°(turn by full 1
turn).
After adjusting, check the braking capacity of the parking brake.
See "CHECK BRAKING CAPACITY OF PARKING BRAKE
(PAGE 4-51)". If the machine moves, contact your Komatsu
distributor for inspection.
WARNING
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