BODY 1U2075 - Caterpillar

Table 1
Related Components: Possible Causes: Recommended Action:
Valve/Lines Boom 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"
Low-pressure setting on main relief
Compensator spool in boom Independent Metering Valve (IMV) section is malfunctioning Refer to Troubleshooting, "IMV Controllability Troubleshooting"(2)
Boom Head End (HE) line relief valve failure Refer to Troubleshooting, "Relief Valve (Line) - Functional Test"(1)
Refer to Testing and Adjusting, KENR9615, "Relief Valve (Line) - Test and Adjust"
Low-pressure setting on boom HE line relief valve
Boom Pump to Cylinder Head End (PCHE) IMV spool is malfunctioning Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Refer to Troubleshooting, "IMV Controllability Troubleshooting"(2)
Boom Cylinder to Tank Rod End (CTRE) IMV spool is malfunctioning
Low pilot pressure Refer to Testing and Adjusting, KENR9615, "Relief Valve (Pilot) - Test and Adjust"
Combiner spool is malfunctioning Refer to Troubleshooting, "Pump Stroke - Functional Test"
Warm-up valve failure Refer to Troubleshooting, "Hydraulic System Warm-Up - Functional Test"
Drive or idler pump bypass spool is malfunctioning Refer to Troubleshooting, "Bypass Valve (ACS Valve) - Functional Test"
Pilot relief valve failure Refer to Testing and Adjusting, KENR9615, "Relief Valve (Pilot) - Test and Adjust"
Electronics/Harness/Solenoids Boom/Bucket joystick is malfunctioning Refer to Troubleshooting, "Joystick - Functional Test"(1)
Boom PCHE Proportional Hydraulic Modulating Valve (PHMV) is malfunctioning Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Refer to Troubleshooting, "IMV Controllability Troubleshooting"(2)
Boom CTRE PHMV is malfunctioning
Idler pump bypass PHMV is malfunctioning Refer to Troubleshooting, "Bypass Valve (ACS Valve) - Functional Test"
Drive pump bypass PHMV is malfunctioning
Combiner PHMV is malfunctioning Refer to Troubleshooting, "Flow Combiner Valve - Functional Test"
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
Boom PCHE PHMV cracking current is incorrect Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Boom PCHE PHMV slope is incorrect
Boom CTRE PHMV cracking current is incorrect Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Boom CTRE 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 process.
(2) Denotes Functional Tests that should be considered as a last resort in the troubleshooting process.