24. SERVICE PROCEDURE 24.2.10 ADJUST PARKING BRAKE WARNING When adjusting, always put block under the tires to prevent the machine from moving. 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 switch 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 air pressure gauge is in the green range, then release the parking brake. 2.
Keep bolt rotainer 1 pressed and turn bolt 2 in a clockwise direction to bring both pads 3 into tight contact with disc 4 . AE134050 3. Keep bolt retainer 1 pressed and turn bolt 2 1/2 turn back in a counterclockwise direction. 4. Release bolt retainer 1 and check that the retainer is in the stopper position for bolt 2 . 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. AE134060 When making the first adjustment after replacing the pad, turn bolt 1 one turn (6 clicks) in the counterclockwise direction.
After adjusting, if the machine moves when the braking capacity of the parking brake is checked (see “24.3 CHECK BEFORE START- ING”), contact your Komatsu distributor for inspection. 3-33