Reason: The rotation direction is opposite to the specified direction; The oil suction pipeline is not tight, and the check valve is stuck; The seal between the pump body and the pump cover is poor; Insufficient oil in the fuel tank; Oil pump parts are seriously worn; The oil suction filter is blocked.

Solution: In actual work, different treatments should be carried out according to specific conditions. Special attention should be paid to the sealing of oil suction pipeline and the sealing between gear oil pump body and pump cover during maintenance. If the oil suction end is poorly sealed, air will leak into the inlet of the oil pump, which will lead to the evacuation of the oil pump and the natural exhaust cannot be discharged.

Extended data:

1, the model of hot oil pump is generally represented by the letter r, and the cold oil pump is represented by the letter j.

2. The gap between the hot oil pump mouth ring is large, and the cooling pump is small.

3. The hot oil pump body is vertically segmented, the cold oil pump body is horizontally open, and some hot oil pumps have structures to prevent the center line of the pump body from moving.

4. Generally, the sealing mechanism of hot oil pump is oil-filled, but the cold oil pump is not.

5. Carbon steel and alloy steel are used as materials for hot oil pumps, while cast iron can be used for cold oil pumps.

6, hot oil pump bearing, bearing box, stuffing box mechanical seal need water cooling, and cold oil pump can't be used.

7. The hot oil pump needs preheating before starting, but the cold oil pump does not.

8. The temperature below 200 degrees Celsius is a cold oil pump, and above 200 degrees Celsius is a hot oil pump.

Baidu encyclopedia-oil pump