MOTOR GP-PISTON 1709992 - Caterpillar

Sudden movement of the machine or release of oil 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 hydraulic system.
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.
Note: Permit only one operator on the machine. Keep other personnel away from the machine or in the operator's sight.
Park the machine on a smooth, level surface. Move away from other operating machines and away from personnel.
Lower the work tools to the ground. Stop the engine.
Engage the parking brake. Place blocks in front of the wheels and behind the wheels.
When the work tool is raised for testing or for adjusting, make sure that the work tool is supported correctly. Also, make sure that the work tool is fully in the DUMP position. The lift circuit has high oil pressure when the lift arms raise the front of the machine. Note: When you stop the machine, make sure that the front of the machine is not off the ground. Unless raising the machine off the ground is required for a test, lower the machine to the ground and stop the engine.
Install the steering frame lock so that the machine cannot articulate.
Cycle the hydraulic control levers through all positions in order to release the pressure in the hydraulic system. Place the tilt control lever in the HOLD position. Place the lift control lever in the FLOAT position. When any test is performed on the hydraulic system, the hydraulic oil must be at the normal operating temperature.During a diagnosis of the hydraulic system, remember that correct oil flow and correct pressure are necessary for correct machine operation. The pump output increases as the engine speed increases and vice versa.