PAN GP-OIL 1680289 - Caterpillar

Sudden movement of the machine or release of oil under pressure can cause serious injury to persons on or near the machine.To prevent possible injury, perform the procedure that follows before testing and adjusting the hydraulic system.
Performance tests on the hydraulic system will help to accomplish the following items:
Determine the cause of poor performance of the hydraulic system.
Locate the source of any hydraulic oil leaks.Start the engine. Operate the engine at high idle for at least 5 minutes. Performance testing should be done when the hydraulic oil is at the normal operating temperature.Problem
The temperature of the hydraulic oil is excessively high.Probable Causes
The viscosity of the hydraulic oil is incorrect.
The compensator valve for the cushion-hitch pump activates at a hydraulic oil pressure that is lower than the specified pressure setting.
The cushion-hitch piston pump is excessively worn.
A relief valve is set too low.
The hydraulic and steering pump has too much wear (high leakage).
A restriction exists in a hydraulic oil passage.
An air restriction exists at the hydraulic oil cooler.
An implement control valve stem is not returning to a HOLD position due to a malfunction of the hydraulic control system.Refer to Service Manual, RENR4099.Problem
The hydraulic and steering pump makes unusual noise. The cylinder rods do not move evenly. Air bubbles are in the oil.Probable Causes
The viscosity of the oil is incorrect.
The implement relief valve opens at low oil pressure.
There is a loose oil line connection on the inlet side of the hydraulic and steering pump.
The hydraulic and steering pump has too much wear.Problem
There is a large amount of air in the oil.Probable Causes
There is a leak in the oil line between the hydraulic tank and the hydraulic and steering pump.
A relief valve is set too low.
The return baffle in the tank is loose or broken.
There is leakage around the cylinder seals.Problem
The hydraulic and steering pump has no pressure.Probable Causes
The hydraulic system is low on oil.
The hydraulic and steering pump has malfunctioned or the pump drive shaft has malfunctioned.
A relief valve has malfunctioned.Problem
The implement hydraulic system remains at standby pressure when any implement lever is moved.Probable Causes
The solenoid valve for the pilot supply has malfunctioned.
The hydraulic control system has malfunctioned.
The pressure reducing valve has malfunctioned.
The cushion-hitch pump has malfunctioned.Refer to Service Manual, RENR4099.Problem
The implement hydraulic system remains at standby pressure when the implement lever is moved in only one direction.Probable Causes
The solenoid valve for the pilot system for that implement has malfunctioned.Refer to Service Manual, RENR4099.Problem
The standby pressure for the implement system is greater than 690 kPa (100 psi).Probable Cause
A solenoid valve for the implement control pilot system has malfunctioned and this causes the valve stem to move from the HOLD position.
There is a restriction in the return line to the tank.Refer to Service Manual, RENR4099.Problem
The response of one implement is too slow.Probable Causes
The valve spool that is installed in the control valve is incorrect for the implements.
A solenoid valve for the implement control pilot system has malfunctioned.
There is a problem with the hydraulic control system for that implement or that implement needs