PULLEY 0027387 - Caterpillar

Probable Causes
The pump controls in the pump are suspect.
The steering pump controls have excessive leakage.Recommended Actions
The Pump Controls In The Pump Are Suspect
Refer to Troubleshooting, KENR8905 for diagnostic code troubleshooting procedures.Ensure that a problem with the steering system electrical components are not causing the steering pump to operate improperly. Check the monitoring system for any fault codes that are related to Steering Position Sensor 1, Steering Position Sensor 2, Steering Position Sensor 3, the Left Steer Solenoid, or the Right Steer Solenoid. If the signals from the steering position sensors are incorrect, the ECM may not be commanding the solenoid to energize properly, and/or 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 Testing and Adjusting, KENR8558, "Steering - Calibrate".The Steering Pump Controls Have Excessive Leakage
Refer to Testing and Adjusting, KENR8558, "Steering Hydraulic Circuit - Test and Adjust".