(1) the speed of the pump is too high.

The shaft of the pump is bent, the wear of the bearing is severe or damaged.

(3) the packing of the pump packing letter is pressed too tight.

(4) the pump impeller is jammed by the sundries or is grim with the pump shell.

The flow of water pump is too large.

The two drive coupling drive shaft coaxial transmission belt is too tight or not.

The matching engine power pump is too small.

The pump head high.

[maintenance method]

One is to reduce the rotational speed of the pump, to replace the pulley with different diameters or to replace the pump with lower speed, so that the speed of the pump will match with the speed of the power machine.

After parking. Remove pump body, check pump shaft and bearing. If the shaft of the pump has been bent, the pump shaft should be repaired or replaced.

The method of straightening the A. pump shaft is to check the bench and find the bending part for the pump shaft. If the premise, can check on the platform or on a lathe with a dial indicator, can also be a pump shaft frame in the V shaped iron. V iron put solid, then dial a table, and then slowly move to the hub rod, pump shaft, the shaft is bent, each rotation of the dial gauge has a maximum reading and a minimum reading, bending axis is the difference between the two readings. There are many ways to straighten the pump shaft. The easiest way to do that is to twist the straight shaft. When the shaft is straight, the shaft must be placed on the hardwood (or the side iron with a copper skin). It requires that the support is soft than the twister, and has large contact surface with the twister. The concave face is downplayed with a hammer and a twister. When hit, start from the place where the bending degree is the largest. The hit range is round 1/3, which can be painted on the axis in advance. The number of 1/3 arc in the center of the arc is more, the less the number of hitting on the two sides, the faster the initial straightening and later slower. In the process of twisting, it is necessary to measure the change of shaft bending in time; if the bearing has been worn or damaged, the bearing should be repaired or replaced.

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