BAR 8K6040 - Caterpillar

Table 1
Related Components: Possible Causes: Recommended Action:
Valve/Lines Low pilot pressure Refer to Testing and Adjusting, KENR9615, "Relief Valve (Pilot) - Test and Adjust"
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
Drive pump bypass stem is malfunctioning Refer to Troubleshooting, "Bypass Valve (ACS Valve) - Functional Test"
Main relief valve failure Refer to Testing and Adjusting, KENR9615, "Relief Valve (Main) - Test and Adjust"
Warm-up valve failure Refer to Troubleshooting, "Hydraulic System Warm-Up - Functional Test"
Stick RE (rod end) relief valve failure Refer to Testing and Adjusting, KENR9615, "Relief Valve (Line) - Test and Adjust"
Stick line relief is malfunctioning
Electronics/Harness/Solenoids Stick PCRE Proportional Hydraulic Modulating Valve (PHMV) solenoid has failed(3) Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Stick CTHE PHMV solenoid has failed(3)
The energize circuit of the stick PCRE PHMV is shorted to ground(3)
The energize circuit of the stick CTHE PHMV is shorted to ground(3)
Drive pump bypass PHMV solenoid has failed(3) Refer to Troubleshooting, "Bypass Valve (ACS Valve) - Functional Test"
The energize circuit of the drive pump bypass PHMV is shorted to ground(3)
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 Slope value is 0mm/A or near 0mm/A Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Cracking calibration value is 0mA or near 0mA
Pump/Motor/Tank Front or Rear pump fails to stroke up Refer to Testing and Adjusting, KENR9615, "Pump Flow Measurement"
(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.
(3) Refer to the appropriate diagnostic code troubleshooting procedure