HYDRAULIC AR 3582156 - Caterpillar

Table 1
Related Components: Possible Causes: Recommended Action:
Valve/Lines Stick Drift Reduction Valve (DRV) poppet is malfunctioning Refer to Troubleshooting, "Drift Reduction Valve - Functional Test"
Main relief valve failure Refer to Troubleshooting, "Relief Valve (Main) - Functional Test"
Stick Head End (HE) line relief valve failure Refer to Troubleshooting, "Relief Valve (Line) - Functional Test"
Low main relief pressure setting Refer to Troubleshooting, "Relief Valve (Main) - Functional Test"
Low stick HE line relief setting Refer to Troubleshooting, "Relief Valve (Line) - Functional Test"
Combiner spool is malfunctioning Refer to Troubleshooting, "Flow Combiner Valve - Functional Test"
Stick 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)
Stick 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"
Idler or drive pump bypass stem is malfunctioning Refer to Troubleshooting, "Flow Combiner Valve - Functional Test"
Compensator spool in stick IMV section is malfunctioning Refer to Troubleshooting, "IMV Controllability Troubleshooting"(2)
Warm-up valve failure (boom or stick) Refer to Troubleshooting, "Hydraulic System Warm-Up - Functional Test"
Electronics/Harness/Solenoids Stick PCRE Proportional Hydraulic Modulating Valve (PHMV) solenoid is malfunctioning Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Refer to Troubleshooting, "IMV Controllability Troubleshooting"(2)
Stick CTHE PHMV solenoid is malfunctioning
Idler pump bypass PHMV solenoid is malfunctioning Refer to Troubleshooting, "Bypass Valve (ACS Valve) - Functional Test"
Drive pump bypass PHMV solenoid is malfunctioning
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
Software Idler pump bypass calibration is incorrect Refer to Troubleshooting, "Bypass Valve (ACS Valve) - Functional Test"
Drive pump bypass calibration is incorrect
Stick PCRE PHMV cracking current is incorrect Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Stick CTHE PHMV cracking current is incorrect
Stick PCRE PHMV slope is incorrect
Stick CTHE PHMV slope is incorrect
Combiner calibration incorrect Refer to Troubleshooting, "Flow Combiner Valve - Functional Test"
Pump/Motor/Tank Front or Rear pump fails to stroke up Refer to Testing and Adjusting, KENR9615, "Pump Flow Measurement"
Engine Low engine speed Refer to Troubleshooting, "Hydraulic Power - 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.