BEARING-ROLLER 4909094 - 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 four bolts (3) and the washers that hold two retaining plates (1) for boot (2). Remove the two retaining plates, and slide the boot up on the steering column. 7. Remove nine button head screws (5), and remove three piece steering column shroud (4). 8. Disconnect two hose assemblies (9) from the secondary and parking brake valve.9. Remove one pin (6) from the control linkage.10. Remove two bolts (8) and secondary and parking brake valve (7). Install the secondary and parking brake valve in the reverse order of removal.