HOUSING-RGLT 1661782 - Caterpillar

Table 1
Related Components: Possible Causes: Recommended Action:
Valve/Lines Idler pump bypass stem is malfunctioning Refer to Troubleshooting, "Bypass Valve (ACS Valve) - Functional Test"
Main relief valve failure Refer to Troubleshooting, "Relief Valve (Main) - Functional Test"
Bucket Pump to Cylinder Rod End (PCRE) Independent Metering Valve (IMV) spool is malfunctioning Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Refer to Troubleshooting, "IMV Controllability Troubleshooting"(2)
Bucket Cylinder to Tank Head End (CTHE) IMV spool is malfunctioning
Low pilot pressure Refer to Testing and Adjusting, KENR9615, "Relief Valve (Pilot) - Test and Adjust"
Pilot relief valve is malfunctioning Refer to Testing and Adjusting, KENR9615, "Relief Valve (Pilot) - Test and Adjust"
Warm-up valve failure Refer to Troubleshooting, "Hydraulic System Warm-Up - Functional Test"
Bucket relief failure Refer to Testing and Adjusting, KENR9615, "Relief Valve (Line) - Test and Adjust"
Electronics/Harness/Solenoids Boom/Bucket joystick is malfunctioning Refer to Troubleshooting, "Joystick - Functional Test"(1)
Boom PCRE Proportional Hydraulic Modulating Valve (PHMV) solenoid has failed Refer to appropriate diagnostic code troubleshooting procedure
Boom CTHE PHMV solenoid has failed
Idler pump bypass PHMV solenoid has failed
The ECM is malfunctioning. A failure of the ECM is unlikely. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with Caterpillar. This consultation may effect repair time. Follow the procedure in Troubleshooting, "ECM - Replace" to replace the ECM
The energize circuit of the Boom PCRE PHMV is shorted to ground Refer to appropriate diagnostic code troubleshooting procedure
The energize circuit of the Boom CTHE PHMV is shorted to ground
Slope value is 0mm/A or near 0mm/A Refer to Troubleshooting, "IMV Calibration - Functional Test"
Cracking calibration value is 0mA or near 0mA
Pump/Motor/Tank Drive pump fails to stroke up Refer to Troubleshooting, "Pump Stroke - Functional Test"
(1) Denotes actions that should be completed first in the troubleshooting sequence.
(2) Denotes Functional Tests that should be considered as a last resort in the troubleshooting process.