VALVE GP-RELIEF 3769450 - Caterpillar

Probable Causes
The hydraulic oil is too thick or the oil is the wrong type.
The steering supply flow is partially blocked.
The pump control is suspect or the control needs adjustment.Recommended Actions:
The Hydraulic Oil Is Too Thick Or The Oil Is The Wrong Type
Ensure that oil is the correct viscosity for the operating conditions. In order to determine the correct oil viscosity, refer to the Operation and Maintenance Manual, SEBU9220, "Lubricant Viscosities and Refill Capacities".Warm the oil to operating temperature.The Steering Supply Flow Is Partially Blocked:
Due to the high pressure involved, the following can create unusual noises:
Blockages in supply and return oil lines.
Kinks in both supply and return oil lines.
restrictions in both supply and return oil lines.The steering motor cannot turn without oil flow to the pump and from the pump. Check for these conditions on all hydraulic oil hoses, lines, and tubes in the steering system.The Pump Control Is Suspect Or The Control Needs Adjustment:
Refer to Troubleshooting, UENR5491 for diagnostic code troubleshooting procedures.Ensure that a problem with the steering system electrical components is not causing the steering pump to operate improperly. Check the monitoring system for any fault codes that are related to the following:
Steering Position Sensor 1.
Steering Position Sensor 2.
Left Steer Solenoid.
Right Steer Solenoid.If the signals from the steering position sensors are incorrect, the ECM may not be commanding the solenoid to energize properly. Also, the ECM may not be commanding the solenoid to de-energize properly. Correct any problems with any or all of these components and then retest for the symptom(s).If no fault codes exist for the steering pump control solenoids, the steering control solenoids and/or the steering position sensors may require calibration. Refer to Specifications, System Operation, Testing and Adjusting, UENR4081, "Steering - Calibrate".