BUSHING 1913394 - Caterpillar

Sudden movement of the machine or release of air under pressure can cause injury to persons on or near the machine. To prevent possible injury, perform the procedure that follows before testing and adjusting the air system and brakes.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Caterpillar Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Caterpillar products.Dispose of all fluids according to local regulations and mandates.
Move the machine to a smooth horizontal location. Move away from operating machines and move away from personnel. Lower all implements to the ground.
Install the wheel lean locking bolt in the front axle. Install the frame lock pin. Engage the parking brake and stop the engine.
Permit only one operator on the machine. Keep all other personnel away from the machine. Also, all personnel should be visible to the operator.
Place chocks in front of the wheels and behind the wheels.
Illustration 1 g00107669
(1) Parking brake (2) Outer plug
Illustration 2 g00850564
(3) Transmission control (lever)
Remove outer plug (2) and an inner plug (not shown) behind outer plug (2). Start the engine. Make sure that the air system pressure reaches the cut out pressure. Depress the service brake control (pedal). Move transmission control (lever) (3) from PARKING BRAKE ENGAGED position to the NEUTRAL position and back to the PARKING BRAKE ENGAGED position. Move the transmission control (lever) many times in order to drain the moisture from parking brake (1). Stop the engine and allow the air to escape from the system. Replace the inner plug and outer plug (2) .Note: When the outer plug (2) is removed, a small amount of oil should be drained into a suitable container.
Illustration 3 g01721981
The air tank is located behind the transmission on the rear of the machine. (4) Air tank (5) Drain valve
Start the engine and allow the air system to reach the cut out pressure. Open drain valves (5) in order to release any water in the sections of air tank (4). The water will lower the capacity in the air tank and water in the air tank can cause the air compressor to operate constantly. Close the drain valve when all the water has been released. Stop the engine.
Depress the service brake control (pedal) many times until all the air pressure has been released from the system.
Relieve all of the air pressure in the system before you perform any of the following procedures:
Loosen any fitting, any hose, or any component.
Tighten any fitting, any hose, or any component.
Remove any fitting, any hose, or any component.
Adjust any fitting, any hose, or any component.