PUMP GP-PISTON 4959595 - 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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat 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 g00950101
(1) Parking brake
(2) Outer plug
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 965 34 kPa (140 5 psi).
Illustration 2 g00950104
(3) Transmission control (lever)
Make sure that the service brake control (pedal) is down. Move lever (3) from PARKING BRAKE ENGAGED position to the NEUTRAL position and back to the PARKING BRAKE ENGAGED position.
Continue to move lever (3) from PARKING BRAKE ENGAGED position to the NEUTRAL position and back to the PARKING BRAKE ENGAGED position. This will 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).