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Answers for diesel driven pump about unable to start, insufficient flow, and water pump heating

Author: admin Source: the internet Posted On: 2020/7/30 10:04:43

Diesel driven pumps are often used in fixed occasions for drainage and municipal flood control. They are directly driven by diesel engines and are equipped with reasonable water distribution heads. They have the advantages of simple and convenient operation and fast water supply. The unit is equipped with a vacuum auxiliary system to avoid manual irrigation, saving time and effort.
  People who have used diesel driven pump must have encountered some minor problems. This does not mean that there is a problem with the quality of the products produced by the manufacturer, because no matter what is used for a long time, there will be some minor problems. Although it will not affect the work for a while, if it is not handled in time, minor faults will occur. It has become a big problem, so it is important to learn some simple repair methods by yourself!
  1, cannot start
   First, check the power supply: whether the switch is in close contact; whether the joint is firmly connected; whether the fuse is blown; whether the three-phase power supply is equal. If there is an open circuit, poor contact, blown fuse, or missing phase, the cause should be found out and repaired in time.
  Secondly check whether it is a mechanical failure of the pump itself
   The common reasons are: packing is too tight or the impeller and pump body are jammed and blocked by debris; the pump shaft, bearing, and leakage reduction ring are rusted; the pump shaft is severely bent, etc.
  Removal method: loosen the packing, dredge the water channel; disassemble the pump body to remove debris and rust; remove the pump shaft for correction or replace with a new pump shaft.
  2, insufficient flow
This is because: the power speed is not matched or the belt slips, which makes the speed low; the blade installation angle of the axial flow pump is too small; the lift is insufficient, the pipeline is too long or the pipeline has a right angle bend; the suction lift is too high; And the impeller is partially blocked or impeller is defective; the water outlet pipe leaks seriously.
Remedy: restore the rated speed of the diesel driven pump, remove the belt grease, adjust the belt tightness; adjust the blade angle, reduce the installation position of the water pump, shorten the pipeline or change the curvature of the pipeline; seal the leak of the water pump, and compact the packing; Clear the blockage and replace the impeller; replace the leakage reduction ring to block the leakage.
  3, water pump fever
Reason: bearing damage; rolling bearing or bracket cover clearance is too small; pump shaft is bent or two shafts are not concentric; tape is too tight; lack of oil or oil quality is not good; the balance hole on the impeller is blocked, the impeller loses balance, increasing the direction Thrust on one side.
Elimination method: replace the bearing; remove the rear cover, install a gasket between the bracket and the bearing seat; investigate the pump shaft or adjust the concentricity of the two shafts; appropriately loosen the tape tightness; add clean butter, and the butter will occupy the bearing About 60% of the inner gap; clear the blockage in the balance hole.

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