1.Key Installation Precautions
System Contamination Control: Prior to installation, the hydraulic tank must be flushed, and all filters (return and pilot) must be replaced. Ensure all hose connections are pristine to avoid particle ingress.
Mandatory Priming: One of the most critical steps is to pre-fill the pump casing with clean hydraulic oil through the drain port before startup.
Air Bleeding: Bleed air from the system until a steady stream of oil is observed. This prevents “dry-start” cavitation, which can destroy a new pump within seconds.
2.Troubleshooting Matrix
Abnormal Noise/Cavitation: Usually caused by air leaks in the suction line or a clogged suction strainer. Verify all seals and hose clamps on the low-pressure side.
Loss of Hydraulic Power: Often indicates internal leakage due to wear on the “tri-friction pairs” (cylinder block/valve plate). Requires resurfacing of the mating parts or regulator adjustment.
Engine Stalling (Engine Bogging): This indicates that the pump is drawing more power than the engine can supply. Check for stuck PC or LS valves in the regulator and recalibrate as per OEM specs.
Overheating: Excessive heat is a sign of high internal bypass. If the drain line flow is excessive, it indicates severe internal wear requiring a comprehensive seal kit replacement or component overhaul.
