HOSE AS 3139081 - Caterpillar

The hoist system operates slowly.
Possible Causes
The oil is not at operating temperature.
Refer to Systems Operation, Testing and Adjusting, "General Information".
There is a problem with the electrical connections between the hoist control, the ECM and the pilot control actuators.
The pilot pressure to the hoist control valve is incorrect.
Refer to Systems Operation, Testing and Adjusting, "Hoist Pilot Pressure - Test and Adjust".
There is a problem with the relief valve for the hoist system.
The relief setting is incorrect.
Refer to Systems Operation, Testing and Adjusting, "Hoist System Pressure - Test and Adjust".
The relief valve is stuck open due to damage or contamination. This may result in reduced system pressure.
Refer to Systems Operation, Testing and Adjusting, "Hoist System Pressure - Test and Adjust".
There is a problem with the hoist control valve.
The spool is not moving to the correct position. This could be due to damage or contamination within the hoist control valve or the pilot control actuators.
Refer to Systems Operation, Testing and Adjusting, "Hoist Control Valve - Test".
The lowering control valve, which is in the hoist control valve, is open.
Refer to Systems Operation, Testing and Adjusting, "Hoist System" for the location of the lowering control valve.
There is mechanical damage to one or both of the hoist cylinders. This could include damage to the seals.
Refer to Disassembly and Assembly, RENR5140 for information on the hoist cylinders.
The gear pump for the hoist system is worn.There is no response when the RAISE position is selected or the LOWER position is selected.
Possible Causes
There is a problem with the electrical connections between the hoist control, the ECM and the Pilot control actuators.
The pilot pressure to the hoist control valve is incorrect.
Refer to Systems Operation, Testing and Adjusting, "Hoist Pilot Pressure - Test and Adjust".
There is a problem with the hoist control valve.
The spool is not moving to the correct position. This could be due to damage or contamination within the hoist control valve or the pilot control actuators.
Refer to Systems Operation, Testing and Adjusting, "Hoist Control Valve - Test".
The lowering control valve, which is in the hoist control valve, is open.
Refer to Systems Operation, Testing and Adjusting, "Hoist System" for the location of the lowering control valve.The body or OEM attachment will not maintain the raised position
Possible Causes
There is a problem with the electrical connections between the hoist control, the ECM and the Pilot control actuators.
There is a problem with the hoist control valve.
The spool is not moving to the correct position. This could be due to damage or contamination within the hoist control valve or the pilot control actuators.
Refer to Systems Operation, Testing and Adjusting, "Hoist Control Valve - Test".
The lowering control valve, which is in the hoist control valve, is open.
Refer to Systems Operation, Testing and Adjusting, "Hoist System" for the location of the lowering control valve.
The springs, which move the spool to the HOLD position, are damaged.
There is mechanical damage to one or both of the hoist cylinders. This could include damage to the seals.
Refer to Disassembly and Assembly, RENR5140 for information on the hoist