YOKE AS 7V4087 - Caterpillar

Table 1
Related Components: Possible Causes: Recommended Action:
Valve/Lines Leak in pilot line between swing brake solenoid and swing brake Refer to Troubleshooting, "Swing Brake - Functional Test"
Low pilot pressure to swing brake solenoid
Swing Motor to Tank (MT) Independent Metering Valve (IMV) spool malfunction Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Refer to Troubleshooting, "IMV Controllability Troubleshooting."(2)
Swing Pump to Motor (PM) IMV spool malfunction
Failed main relief valve Refer to Troubleshooting, "Relief Valve (Main) - Functional Test"
Pilot relief valve failure Refer to Testing and Adjusting, KENR9615, "Relief Valve (Pilot) - Test and Adjust"(2)
Electronics/Harness/Solenoids Stick/swing joystick is malfunctioning Refer to Troubleshooting, "Joystick - Functional Test"(1)
The energize circuit of the swing brake solenoid is shorted to ground(3) Refer to Troubleshooting, "Swing Brake - Functional Test"
The energize circuit of a swing Left Proportional Hydraulic Modulating Valve (PHMV) is shorted to ground(3) Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Refer to Troubleshooting, "IMV Controllability Troubleshooting."(2)
The energize circuit of a swing Right PHMV is shorted to ground(3) Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Refer to Troubleshooting, "IMV Controllability Troubleshooting."(2)
The energize circuit of a drive pump bypass PHMV is shorted to ground(3) Refer to Troubleshooting, "Bypass Valve (ACS Valve) - Functional Test"
Swing spool PHMV solenoid failure(3) Refer to Troubleshooting, "IMV Calibration - Functional Test"(1)
Refer to Troubleshooting, "IMV Controllability Troubleshooting."(2)
Drive pump bypass PHMV solenoid failure(3) Refer to Troubleshooting, "Bypass Valve (ACS Valve) - Functional Test"
Software Related 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 Rear pump fails to stroke up Refer to Testing and Adjusting, KENR9615, "Pump Flow Measurement"
Rear pump failure
Swing motor failure Refer to Testing and Adjusting, KENR9615, "Swing Motor - Test - Measurement of Case Drain Oil"(2)
Low hydraulic oil in tank Check for related diagnostic code
(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 appropriate diagnostic code troubleshooting procedure.