1. If you want to drain all the oil in the multi-stage pump box, you can unscrew the drain plug at the lower part of the box to drain the oil.
2. In the case of multi-stage pump discharging oil, the height between the liquid level and the top plate of the oil tank shall not exceed 30mm to ensure the smoothness and cooling of each bearing in the pump. When the volume of Jack working chamber is too large, additional oil tank shall be set to ensure that the minimum height of the liquid level after oil discharging is not less than 100mm to avoid suction.
3. After the variable speed multistage pump runs for 500h for the first time, the oil tank and oil filter shall be changed and cleaned. The oil quality shall be tested by visual inspection and test. When the oil quality deteriorates, the oil tank and oil filter shall be changed in time. If there are metal chips or water in the oil, the reason shall be found and the fault shall be eliminated.
4. In a short period of time when the liquid level drops, the bearing can be smooth by the oil attached and the oil splashed by the plunger spring. The oil filter of the oil tank and the oil filter under the pump are made of 230 mesh / inch copper wire mesh. The oil filter mesh should be cleaned frequently to prevent infarction. The oil temperature of the oil tank should not exceed 60 ℃ during operation, and appropriate measures should be taken for cooling if necessary.