Excessive shaft power

1.Impeller rubbing

1.Adjust impeller position

2.Excessive flow rate

3.Increase discharge line resistance

Insufficient head

1.Worn seal ring

1.Replace seal ring                                                    

2.Strainer or passage clogged

2.Remove blockage

3.Severely worn impeller

3.Replace impeller

Insufficient flow rate

1.System head too high

1.Reduce system head

2. Strainer or passage clogged

2.Remove blockage

3.Worn flow-passing components

3.Replace worn parts

4.Worn seal ring

4.Replace seal ring

              Rolling bearing overheating                  

1.Excessive or insufficient grease

1. Adjust grease quantity

2.Grease deteriorated or contaminated                                         

2.Replace grease

3.Bearing worn                                                                                                            

3. Replace bearing                                                            

Vibration and noise

1.Non-uniform impeller wear

1.Replace impeller

2. Roller bearing worn or damaged

2.Replace bearing

3.Shaft bent

3.Straighten or replace shaft

4. Air ingress into pump suction

4Eliminate air ingress