All hydraulic test ports show 0 PSI: is the pump coupling failed?
Short Answer
If every hydraulic test port shows 0 PSI while the engine runs, a failed pump drive coupling becomes a serious possibility, especially when electrical lockout checks are normal. JIAJUE confirms pump rotation and pilot-pump output before selling a hydraulic pump, coupling, or solenoid set.
What To Check
- Confirm the engine is running normally, hydraulic oil level is correct, and the control lock is released.
- Measure pilot-pump outlet flow or pressure and listen for pump rotation before removing the pump.
- Match replacement coupling or pump parts by engine model, pump shaft, coupling style, and machine serial number.
Related JIAJUE Parts
Send the machine model, serial number, old part label, pressure readings, and clear photos before ordering so JIAJUE PARTS can help reduce wrong-fitment risk.
Source Record
This question was selected from a current search-visible industry discussion for the keyword excavator all hydraulic test ports 0 PSI pump coupling. The answer is rewritten from JIAJUE parts-matching and sourcing practice, not copied from the source page.
