HEAD 9J1213 - Caterpillar

by the operator. The cylinders then move in the correct direction.Probable causes:
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 the RAISE position or to the LOWER position.Probable causes:
The machine is being operated improperly.
The pilot system pressure is too low.
The modulation current to the solenoid is not correct.
The lift position sensor is damaged or the sensor not calibrated properly.
The relief valve setting for the ride control valve is too low while the ride control switch is ON.
The main control valve is contaminated or damaged.
The makeup valve is sticking.
The main relief valve setting is too low. Problem 8: All implement functions are sluggish.Probable causes:
The oil level is low.
The pump is worn or damaged.
The implement electronic control module is not calibrated.
The pressure reducing valve for pilot pressure is not functioning properly.
The hydraulic system is contaminated. Problem 9: The implement functions are erratic or intermittent.Probable causes:
The oil level is 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 tank above the level of oil that is in the tank.
There are leaks in the oil suction line between the pump and the tank.
The pump has too much wear.
The implement electronic control module is not calibrated.
The pressure reducing valve for pilot pressure is not functioning properly.
The main control valve is contaminated or damaged.
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 10: There is too much lift cylinder drift.Drift is a cylinder movement with the control lever or the joystick in the HOLD position.Probable causes:
The modulation current to the solenoid is incorrect.
The ride control valve is worn or damaged.
The piston seals and/or the lift cylinders are worn.
The components of the main control valve are worn or damaged.
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.
The lift lever sensor is not properly mounted. The lift lever sensor not calibrated properly. Problem 11: The hydraulic force is too low when the tilt control lever is moved to the TILT BACK position or to the DUMP position.Probable causes:
The machine is being operated improperly.
The position sensor for the tilt control lever is sending an incorrect signal.
The modulation current to the solenoid is incorrect.
The pressure reducing valve for pilot pressure is not functioning properly.
The settings of the line relief valves are too low.
The piston seals and/or the tilt cylinder is worn.
The main control valve is contaminated or damaged.
The main relief setting is too