SPREADER AS 3115958 - Caterpillar

Caterpillar Monitoring System when the system is in the Service Mode. Make sure that all faults are corrected before you troubleshoot the following problems.Reference: For additional information on the Implement Electronic Control System, refer to System Operation, "Implement Electronic Control System".Reference: For additional information on troubleshooting the Implement Electronic Control System, refer to Testing and Adjusting, "Troubleshooting Diagnostic Codes".Some of the terms that are used for troubleshooting the machine are defined below.
"Collapse" is the sudden drop of an implement cylinder during normal operation.
"Drift" is the creeping of the implement cylinders while the control is in the HOLD position.
"Droop" is an initial movement of the hydraulic cylinders in the opposite direction of the selected lever position. The cylinders then move in the correct direction.Problem 1: The pump makes noise and the cylinder rods do not move evenly. There are also air bubbles in the oil.Probable causes:
The viscosity of the oil is incorrect.
The relief valve opens at low oil pressure.
There is a loose connection of the oil line on the inlet side of the pump.
The pump has too much wear.Problem 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.
The hydraulic oil temperature sensor is faulty.
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 implement pump output 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 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 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