PLATE-THRUST 2569662 - Caterpillar

Before making any tests or adjustments on the brake system, stop the machine on level ground and lower the bucket to the ground. Move the control knob for the parking brake to the ON position. Put blocks in front of and behind the wheels. Permit only one man on the machine. Keep all other personnel away from the machine. Never disconnect any air or brake fluid lines in the brake system until all pressure is removed. Failure to remove this pressure will have a sudden release of air or brake fluid under high pressure. This can cause injury to personnel. To remove the pressure from the brake system: Engage the parking brake. Stop the engine. Push on either brake pedal many times until there is no more brake air pressure. When the air pressure has been removed from the air circuit, there will be no pressure in the brake hydraulic circuit.
1. Start the engine and let the air pressure go up to operating range.2. Move the control knob for the parking brake to OFF (brake released) position. Stop the engine.3. Remove cotter and pin (8).4. Push end of brake actuating lever (9) toward air chamber (1) until brake shoes (3) contact drum (2). Hold lever (9) in this position during Step 5.5. Loosen locknut (6) and rotate rod end (7) on threaded rod (5) until holes in rod end (7) and lever (9) are aligned. Rotate rod end (7) one turn in the direction away from air chamber (1). Insert pin (8) and cotter and tighten locknut (6).6. Make a mark on rod (5) even with the front of bracket (4).7. Move control knob for parking brake to ON (brake engaged) position and check stroke [distance (A)]. Do Steps 1 thru 6 again if distance (A) is more than ... 15 mm (.59 in) Parking brake is adjusted properly if the machine can not be moved in second speed forward with the engine at high idle. Brake drum (2) must be free to rotate when parking brake is released. If the machine must be towed and no air pressure is available to release the parking brake, then locknut (6) can be tightened against bracket (4) until the brake releases.8. Lining thickness (minimum) ... 6 mm (.24 in)