PLATE 1234628 - Caterpillar

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 to be calibrated.Refer to Service Manual, RENR4099.Problem
The responses of all the implements are too slow.Probable Causes
There is air in the system.
The implement relief valve is set too low or the implement relief valve leaks.
The pressure reducing valve is malfunctioning.
There is a problem with the hydraulic control system for that implement or that implement needs to be calibrated.Refer to Service Manual, RENR4099.Problem
The performance of all the implement circuits are erratic.Probable Causes
The hydraulic oil has not reached normal operating temperature.
The hydraulic and steering pump has failed.
There is air in the hydraulic system.
There is a problem with the hydraulic control system for that implement or that implement needs to be calibrated.Refer to Service Manual, RENR4099.Problem
Any implement moves with the joystick control in the HOLD position.Probable Causes
The cylinder piston seal has failed.
A valve for the implement control pilot system for that implement has malfunctioned.Refer to Service Manual, RENR4099.