PISTON-CLUTCH-YM 3940910 - Caterpillar

Implement and Steering Hydraulic System
Personal injury or death can result from sudden machine movement.Sudden movement of the machine or release of oil under pressure can cause injury to persons on or near the machine.To help prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic and steering system:
Move the machine to a smooth, horizontal location. Move away from working machines and from personnel. Lower implements to the ground.
Permit only one operator on the machine. Keep all other personnel away from the machine. Keep all other personnel within the view of the operator.
Engage the parking brake. With the parking brake engaged, the tiller handle for steering can not be moved. If the parking brake is off and the engine is operating, the machine will turn when the tiller handle is moved. Engage the service brakes in order to prevent machine movement.
Turn off the engine.
Move the implement control levers to all positions in order to release the pressure in the hydraulic system.
Engage the service brakes several times in order to release the pressure in the brake circuit.
Carefully loosen the filler cap on the hydraulic tank in order to release the pressure in the tank.
Make sure that all hydraulic pressure is released before any fittings, any hoses, or any components are loosened, tightened, removed, or adjusted.
Tighten the filler cap on the hydraulic tank.
When the pressure in the system has been relieved, the lines or the components can be removed.Note: During a diagnosis of the implement and steering hydraulic system, remember that correct oil flow and correct oil pressure are necessary for correct operation. Oil pressure is caused by a resistance to the flow of oil.Procedure
When you define a problem with the implement and steering hydraulic system, follow this procedure.Perform the visual checks in Testing and Adjusting, "Visual Inspection". If you complete the visual checks and the problem is not identified, perform the operation checks under Testing and Adjusting, "Operation Checks". If you complete the operation checks and the problem is not identified, perform the tests under Testing and Adjusting, "Steering Hydraulic Circuit - Test".This procedure can help identify problems with the implement and steering hydraulic system. When the problem is defined, refer to Testing and Adjusting, "Implement and Steering Hydraulic System - Troubleshooting". The troubleshooting section lists the probable causes of a known problem. Because more than one cause may exist for a problem, the troubleshooting section may call for specific inspections or for specific instrument tests. These inspections and tests help with the identification of the most probable causes.Refer to the Testing and Adjusting, "Implement and Steering Hydraulic System - Troubleshooting" in order to locate problems in the implement and steering hydraulic system. The Testing and Adjusting, "Implement and Steering Hydraulic System - Troubleshooting" can also be used for the correction of those problems. Use the following instruments when additional checks are necessary: the 8T-5320 Hydraulic Test Group, the 4C-4890 Hydraulic Test Group, the 4C-4892 ORFS Fittings, a stopwatch, a magnet, a thermometer and a ruler