CONTROL & MTG GP-JOYSTICK 2218818 - Caterpillar

Before any air lines are disconnected, make sure the air pressure is zero.
1. Disconnect electrical wiring (1), and five air lines (2).2. Disconnect linkages (3).3. Remove bolts (4) and remove brake control valves (5). The following steps are for the installation of the brake control valves.4. Put brake control valves (5) in position with bolts (4).5. Connect linkages (3).6. Connect air lines (2) and electrical wiring (1).Disassemble Brake Control Valves
Start By:a. remove brake control valve 1. Remove the pilot valve and the double check valve from the brake control valve.2. Remove retainer (1) from the valve body.3. Remove piston assembly (2) from the valve body. Remove the spring under the piston assembly. 4. Remove O-ring seal (3) from the piston assembly. Check the condition of the seal. If the seal has damage, use a new part for replacement.5. Remove bolt (4), washer and seat (5) from the piston. Remove the rubber spring under the seat.6. Turn the brake control valve over. 7. Remove snap ring (6), washer (8) and valve assembly (7) from the valve body. 8. Remove O-ring seal (10) from the valve assembly. Check the condition of the seal. If the seal has damage, use a new part for replacement.9. Remove screw (12), washer (11) and diaphragm (9) from the seat. 10. Put spring (14) under compression and remove lock spring (16). Remove valve (13) and spring (14) from seat (15).11. Remove retainer (17) from the valve.12. Remove O-ring seal (18) from the valve. Check the condition of the seal. If the seal has damage, use a new part for replacement.Assemble Brake Control Valve
1. Make sure all the parts of the brake control valve are clean and free of dirt and foreign material before it is assembled.2. Install the retainer (17) on the valve. Install a new O-ring seal on the valve. 3. Install spring (14) on seat (15). Install valve (13) in the spring as shown. Put spring (14) under compression and install lock spring (16) to hold the unit together. 4. Install diaphragm (9) in the seat. Install washer (11) and screw (12) to hold it in position. 5. Install O-ring seal (19) on the valve assembly.6. Install the valve assembly in the valve body. 7. Install washer (8) and snap ring (6) to hold the valve assembly in the valve body. 8. Install rubber spring (20) in the piston as shown. Install seat (5), washer and bolt (4). 9. Install a new O-ring seal (21) on the piston assembly.10. Install spring (22) the piston assembly and retainer (1) in the valve body.11. Install the double check valve and the pilot valve in the brake control valve. If any additional adjustment, torque or pressure information is required, see Caterpillar Publication SENR4264-01 632E Tractor-Scraper Elevator hydraulic System Supplement.End By:a. install brake control valve