SEAL-D-RING 3260547 - Caterpillar

Sudden movement of the machine or release of air or oil under pressure can cause personal injury to persons on or near the machine. To prevent possible personal injury, do the following procedure which follows before servicing the air system or brakes.
1. Move the machine to a smooth horizontal location. Move away from working machines and personnel.2. Permit only one operator on the machine. Keep all personnel either away from the machine or in view of the operator.3. Activate the secondary and parking brake. Lower the bucket to the ground. Put wood blocks in front of and behind the wheels. Stop the engine.4. Continuously push on the brake pedal until there is no more brake air pressure. When the pressure has been removed from the air circuit, there will be no more pressure in the hydraulic circuit.5. Be sure all air pressure is released before any fitting, hose or component is loosened, tightened, removed or adjusted. Before any operational checks are made, open the drain valve to release any water in the air reservoir. Water lowers the capacity in the reservoir and can cause the air compressor to run constantly. Close the drain valve.6. Remove the brake pedals.
View From Under Cab7. Disconnect three tube assemblies (3) and two hose assemblies (2) from the brake valve. For the right side brake valve, disconnect three tube assemblies and one hose assembly.8. Remove brake valve (1).9. Remove the other brake valve as in Steps 7 and 8. The following steps are for the installation of the brake valves (foot operated).10. Check the condition of the O-ring seals used for the installation of the brake valves. If any of the seals are worn or damaged, use new parts for replacement.11. Put brake valve (1) in position under the floor plate. Install the bolts that hold it.12. Connect three tube assemblies (3) and two hose assemblies (2) to the brake valve. For the right side brake valve, connect three tube assemblies and one hose assembly.13. Install the other brake valve as in Steps 11 and 12.14. Reinstall the brake pedals.15. Start the machine, and check the operation of the brakes.Disassemble Brake Valves (Foot Operated)
Start By:a. remove brake valves (foot operated)1. Be sure the outside of the brake valve is thoroughly clean prior to disassembly.
There is spring force against retainer (3). The spring force will be released when retainer (3) is removed. To prevent possible personal injury, hold the retainer in position as it is being removed, and release the spring force slowly.
2. Remove retainer (3), piston assembly (2) and spring (1) from the body. 3. Remove O-ring seal (5) from the piston.4. Remove bolt (8) and the washer. Remove seat (7) and spring (6) from piston (4). 5. Use tool (A) to remove snap ring (9).6. Remove valve assembly (10) from the valve body. Remove the O-ring seal from the valve body. 7. Remove screw (18) and the washer. Remove diaphragm (17) and spring (16) from seat (15).8. Remove valve (11) and spring