Gear oil pump is suitable for conveying various lubricating liquids, the temperature is not higher than 70 ℃, if it needs high temperature 200 ℃, it can be matched with high temperature resistant materials, the viscosity is 5 × 10-5 ～ 1.5 × 10-3m2 / s .This pump is not suitable for conveying corrosive, hard particles or fibers, highly volatile or low flash point liquids, such as gasoline, benzene, etc.Then the low-pressure gear oil pump is damaged, how to deal with it: 1. Repair of gear oil pump drive shaft and bushing after wear and tear After the driving shaft and bushing of the low-pressure gear oil pump are worn, the cooperation gap between the low-pressure gear oil pump will increase, which will definitely affect the pump oil volume.In this case, the normal cooperation gap can be restored by repairing the driving shaft or the bushing.If the wear of the drive shaft is slight, you only need to press out the old bushing and replace it with a standard-size bushing, and the cooperation gap can recover to the agreed scale.If the drive shaft and the bush are severely worn and the cooperation gap is severely overrun, not only the bush is replaced, but the drive shaft is also chrome-plated or oscillated to increase its diameter, and then ground to a standard size. Cooperation needs. 2.Fixing the crack of the smooth oil pump casing of the gear oil pump Shell cracks can be repaired by casting 508 nickel copper electrode.Welds must be tight and pores, and the flatness error of the contact surface with the pump cover is not greater than 0.05 mm. 3. Repair of wear of gear oil pump driving shaft bushing hole and driven shaft hole After the low-pressure gear oil pump active shaft bushing hole is worn, the wear mark can be eliminated by reaming, and then a bushing enlarged to the corresponding size can be used.The driven shaft hole wear is also eliminated by the reaming method, and then the driven shaft is manufactured according to the practical scale of the reamed hole. 4. Repair of the inner cavity of the gear oil pump casing After the inner cavity of the pump casing is worn, it is usually corrected by the inner cavity inserting method. After the inner cavity is enlarged, it is fitted with a cast iron or steel bushing.After inserting the sleeve, 5. Repair of pump cover of low-pressure gear oil pump Repair of the working plane: If the operating surface of the gear oil pump pump cover is less worn, you can use manual grinding to eliminate the wear marks, that is, put a small amount of valve sand on the channel or thick glass plate, and then place the low-pressure gear oil pump pump cover on it for grinding Until the signs of wear and tear disappear, the work surface is flat and stopped.When the wear depth of the pump cover's operating plane exceeds 0.1 mm, it should be corrected by turning and grinding first.