Winter overhaul and maintenance of water pumps

- 2021-09-27-

1. After the water pump is out of service, drain the remaining water in the water pump and the pipeline, and clean the external soil, so as to avoid the accumulation of water and freezing after freezing and the pump body and the water pipe will burst and crack.
2. For cast iron parts such as the bottom valve and elbow of the pump, the rust should be brushed off with a wire brush, and then painted with anti-rust paint before painting. After drying, put it in the computer room or storage room in a ventilated and dry place. .
3. If the belt is driven, the belt should be cleaned and dried with warm water and then hung in a dry place without direct sunlight. Don't store it in a place with oil, corrosion and smoke. In any case, do not stain the belt with oil, diesel, gasoline or other oily substances, and do not apply rosin and other viscous substances.
4. Check the ball bearings. If the inner and outer jackets are worn, moved, the balls are worn, or there are spots on the surface, they must be replaced. For those that do not need to be replaced, use gasoline or kerosene to clean the bearings, grease them, and reinstall them.
5. Check whether the impeller of the water pump has cracks or small holes, whether the fixing nut of the impeller is loose, repair or replace if damaged. If the impeller is worn too much or has been broken, it should generally be replaced with a new impeller. Local damage can be repaired by welding, or the impeller can be repaired with epoxy mortar. The repaired impeller should generally undergo a static balance test. Check the clearance at the wear-reducing ring of the impeller. If it exceeds the specified value, repair or replace it.
6. The bent or severely worn pump shaft should be repaired or replaced, otherwise it will cause imbalance of the rotor and wear of related parts.
7. Soak the removed screws in diesel oil with a steel wire brush to clean them, and coat them with oil or butter, reinstall them or wrap them with plastic cloth and put them away (also can be immersed in diesel oil for storage) to avoid corrosion or loss.