BUCKET & ADJUSTER GP 3476739 - Caterpillar

Do not disconnect any air lines until all the air pressure in the air system is released. Personal injury can be the result if air lines are disconnected before the air pressure is zero.
1. Release the air pressure in the air tank by loosening the bleed valves on the air tank. The air tank is behind the rear bumper. 2. Remove cotter pin and pin (4) to disconnect the linkage at the rear of brake control air valve (2).3. Put identification marks on five air lines (3) for installation purposes. Disconnect the five air lines from brake control air valve (2).4. Disconnect two wires (5) and wire (1).5. Remove two bolts (not shown) that secure bracket (6) to the bottom of the operator module.6. Remove brake control air valve (2) from the machine.Install Brake Control Air Valve
1. Position brake control air valve (2) with bracket (6) to the machine. Install the two bolts that hold the parts in place.2. Connect the brake pedal lever, in position, to brake control air valve (2). Install cotter pin and pin (4) to brake control air valve (2).3. Connect five air lines (3) to brake control air valve (2).4. Connect two wires (5) and wire (1) to brake control air valve (2).5. Make an adjustment to the brake pedal and to brake control air valve (2). See the topic, "Pedal Adjustments For Service Brake and Control Valve Adjustment," in the System Operation Testing & Adjusting Manual, SENR8529.Disassemble Brake Control Air Valve
Start By:a. remove brake control air valve 1. Remove cotter pin (1), pin (2) and lever (3) from the brake control valve. 2. Remove bolts (6), the washers, bracket and brake valve plate (5) and brass shim (4) from brake control valve. 3. Remove plunger (7) and rubber boot (8) from bracket and brake valve plate (5). 4. Remove bolts (10), the washers and control valve group (9) from the brake control valve. 5. Remove O-ring seal (11) from control valve group (9). Remove Phillips head screws (15), the washers and valve exhaust elbow (14) from control valve group (9).6. Remove inlet and exhaust valve (13) from control valve group (9). Remove O-ring seal (12) from control valve group (9).
Cover (24) holds springs that are under compression. Hold cover (24) while removing nut (25) to prevent spring ejection and personal injury.
7. Remove nut (25), cover (24) and spring (23) from brake control valve.8. Remove piston (20) and piston (16) from brake control valve.9. Remove screw and small retaining washer (19) from piston (16).10. Remove O-ring seal (18) from piston (16).11. Remove O-ring seal (22) from piston (20).12. Remove large springs (17) and (21) from brake control valve. 13. Use Tool (A) in order to remove snap ring (28) and inlet and exhaust valve (27) from brake control valve.14. Remove O-ring seal (26) from inlet and exhaust valve (27).Assemble Brake Control Air Valve
1. Make sure that all components of the Brake Control Valve and the matching components are clean prior to installation. During