Applicable Systems
PC200 Excavator
Symptoms
Hydraulic pump feedback system malfunction; pump flow control degraded; uneven hydraulic performance.
Possible Causes
- Pump feedback sensor signal abnormal
- Feedback piston worn or stuck
- Pump regulator valve malfunction
Troubleshooting Steps
- Step 1: Check pump feedback pressure sensor output
Sensor signal 0.5-4.5V range - Step 2: Inspect feedback piston for wear or sticking
Piston moves freely in bore - Step 3: Test pump regulator valve operation
Valve responds to command - Step 4: Replace feedback sensor if signal out of range
New sensor output within spec - Step 5: Clear code and calibrate pump feedback system
Feedback system calibrated to spec
How to Reset
Clear via service monitor after pump feedback calibration.
Common Replacement Parts
- Pump Feedback Sensor P/N: 705-99-67100
Frequently Asked Questions
- Q: What does the pump feedback system do?
It monitors actual pump output pressure/flow and feeds back to the regulator for closed-loop hydraulic control.
Source: truckmanualshub.com Komatsu PDF
Category: Heavy Equipment