What are the causes of abnormal noise in fire pumps on fire engines?

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When there is abnormal noise in the fire pump on the fire truck, there are the following reasons:

First, the fire pump bearing is damaged and needs to be replaced

Second, the fire pump impeller loose, grinding to the end of the fire pump outlet cover

Third, the fire pump can not normally supply water for three reasons

1. Is the fire pump a centrifugal pump? Is it necessary to divert the water?

    

2. Is there any foreign matter in the fire pump outlet or impeller gap?

3. Is the fire pump seal well-sealed?


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