1. Abnormal Power Operation (Most Obvious and Easiest to Identify)
The oil pump does not respond at all after being powered on; it does not rotate.
The oil pump is running normally, but there is no response when pushing the oil cylinder; the oil cylinder does not move.
The oil cylinder moves unevenly, moving forward and then stopping, jamming, crawling and shaking, unable to smoothly advance and retract.
2. Abnormal Pressure Parameters
The pressure cannot be adjusted; no matter how the pressure regulating valve is turned, the pipe cannot be pushed to connect, and the connection pressure does not reach the required level.
The pressure is unstable; after connection, the pressure slowly drops, often automatically dropping, requiring repeated pressure replenishment.
The pressure cannot be released; when shutting down and retracting, the pressure does not drop, and the oil cylinder cannot retract normally; or the pressure regulating knob does not change after turning, indicating that the pressure regulating function is malfunctioning.
3. Abnormal Sealing Leakage
These are the most easily observable signs:
Oil leakage at pipe joints and quick-connect fittings; leaked hydraulic oil is visible on the ground.
Bulging, cracking, or even direct leakage appears on the surface of high-pressure oil pipes.
Continuous oil leakage from cylinder end caps and piston rods; new oil stains are visible after each operation.
Hydraulic oil seeps from valve block mating surfaces.
