HOUSING GP-AXLE 1217670 - Caterpillar

2: The oil temperature is too high.Probable causes:
The machine is being operated above the intended capacity or in ambient temperatures that are too high for the machine's design.
The viscosity of the oil is incorrect.
The setting of the main relief valve is too low. This will cause the relief valve to open.
The pump has too much wear.
There is a restriction in an oil passage.
There is a leak in one or more circuits.
The load on the system is too high. This causes the relief valve to open.
The oil level is low.
The oil is contaminated.
The air flow through the oil cooler is too low.
The oil flow through the oil cooler is too low.
There is air in the hydraulic oil.Note: A problem with air in the hydraulic oil must be corrected before the hydraulic system will operate at normal temperatures. There are two conditions that cause air to be in the hydraulic oil:
Return oil is flowing into the hydraulic oil tank above the level of oil that is in the tank.
There are leaks in the line between the hydraulic pump and the hydraulic oil tank.Problem 3: The output for the implement pump is low.Probable causes:
The engine power is too low.
The oil level is low.
The viscosity of the oil is incorrect.
The pump has too much wear.
The pump is not upstroking.Problem 4: The oil pressure is low.Probable causes:
The relief valve opens at low oil pressure.
The pump has too much wear.
The main control valve and the valve spool have excessive wear.Problem 5: The work tool moves while the control lever is in the HOLD position.Probable causes:
The main control valve and the valve spool have excessive wear.
There is a leak between the control valve and the cylinder that has drifted.
A spool in the control valve is not centering correctly.
The control lever was not in the HOLD position when the engine start key was turned to the ON position. There may be dirt or the return spring may be broken.
The lever position sensor has failed.
The position sensor for the implement control linkage has failed.
A solenoid on a pilot control actuator has failed.
The solenoid on the pilot control actuator is improperly torqued.Problem 6: The work tool droops when the lift control lever is moved from HOLD to RAISE.Droop - The Initial movement of the hydraulic cylinders in the opposite direction of the selected lever position and the cylinders then move in the correct direction.Probable causes:
The makeup valve is not functioning properly.
The oil is too cold.
The piston seals and/or the lift cylinders are worn.
The load check valve is not closing because the spring is weak or broken or because there is dirt or debris in the check valve.Problem 7: The hydraulic force is too low when the lift control lever is moved to RAISE or to LOWER.Probable causes:
The engine power is too low.
The machine is being operated improperly.
The pilot system pressure is too low.
The control current to the solenoid is not correct.
The position sensor for the lift control lever is damaged.
The main control valve is contaminated or damaged.
The makeup