COVER-PILOT 3100345 - Caterpillar

Personal injury or death can result from escaping fluid under pressure.Escaping fluid under pressure, even a very small pin-hole size leak, can penetrate body tissue and cause serious injury and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury.Always use a board or cardboard when checking for a leak.
Probable Causes
The oil is too cold.
A piston seal in a cylinder has excessive wear.
There is a leak between the control valve and the cylinder that has drifted.
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 control valve is not centering correctly.
The lift control lever and/or the position sensor may be worn or damaged
Sticky makeup valve Recommended Actions
Note: Care must be taken in order to ensure that fluids are contained during inspection, maintenance, testing, adjusting, and repair of the machine. You must be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component that contains fluid. Dispose of all fluids according to local regulations.The Oil Is Too Cold
Refer to Operation and Maintenance Manual, SEBU7838, "Lubricant Viscosities and Refill Capacities".There Is A Leak Between The Control Valve And The Cylinder That Has Drifted
Leaks at fittings and other types of hydraulic line connections can cause loss of oil flow.This can prevent components from attaining pressures that are necessary to perform work. Low hydraulic pressure will cause the implements to be weak. Low hydraulic pressure will also cause the implements to drift in the HOLD position. Check for leaks at all fittings and connections of hydraulic oil hoses, lines, and tubes in the system in question. Correct any problems that are found. Retest the system.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
Refer to Testing and Adjusting, "Lift Cylinder - Isolation and Drift Check" in this manual.Refer to Testing and Adjusting, "Tilt and Tip Cylinder - Isolation and Drift Check" in this manual.
Ensure the machine is on a level surface.
Raise the blade approximately 300 mm (12 inch) off the ground. Place the lift control lever into the HOLD position. Apply the parking brake. Shut off the engine.
Shut off the engine. Watch the lift cylinder rods for movement (cylinder rods retracting).The Control Valve Is Not Centering Correctly
Refer to Testing and Adjusting, "Position Sensor for the Lift Linkage (Electronic Technician) - Calibrate" in this manual.The Lift Control Lever And/Or The Position Sensor May Be Worn Or Damaged
Refer to Testing and Adjusting, "Position Sensor for the Joystick Control (Electronic Technician) - Calibrate" in this manual.Check the monitoring system in order to check for event codes associated with the implement control handle raise/lower sensor.If one or more of the above event codes is logged, check the monitoring system for fault codes related to the blade control handle raise/lower sensor.