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                  ProblemsCauseRemedies

                  Troubles

                  Cause

                  Remedies

                   After the pump startingno

                   water i s drawn in. and the

                   hands ofracuunl gauge and

                   manometer beat heavily

                  The water poured in the pmnp is not enough

                  Leakage of air is found from the suction

                   pipe

                  Pour water into the pump again

                  Block the leaking place

                  The pump doesnt draw any water but a high degree vacuum is indicated on the vacuum gauge

                  The foot valve is not opened

                  The resistance of suction is too high

                  The suetion head is too high

                  Correct or renew the foot valves

                  Clean or renew the suction pipe

                  Make the suction head lower

                  No water is pumped outBut high pressure is shown on the outlet nlanonleter

                  The direction of the rotation is not right

                  The suction resistance is too high

                  The impeller flow passage is clogged

                  The revolutions is not enough

                  Change the direction of the rotation

                  Check the length of the pipe

                  Clean the impeller

                  Increase the revolutions

                   

                  Tile flow rate is decreasing or the laead is low

                  The impeller flow passage or(inlet pipe and outlet pipe)in-out-let pipes are clogged

                  The seal ring and the impeller is worn out

                  The running speed of the pump is lower than

                   the rated

                  Clean tile impeller and the pipe passage way

                  Renew the worn parts

                  Increase the revolutions

                   

                  Over consumption of the pump power.

                   

                  Packing is too tight

                   The impeller is rubbed by double suction seal ring

                  The flow rate is too large

                  Loosen the packing gland

                  Clear out the mechanic friction

                  Turn the discharge valve brake smaller

                   

                  Unexpected noises are heard and 110 water is drawn

                  The suction resistance is too high

                  The suction head is too high

                  Leakage of air found from the suction pipe

                  Error is found

                  Check the pipe and the foot valve

                  Make the suction head lower

                  Block the leaking place

                  Adjust the use of discharge breake valve in specific working condition

                   

                   

                  The pump vibrates heavily

                   

                   

                  Error is found

                  The impeller is not balance

                  Tile pump shaft is not concentric with the motor.

                  The nuts of foundation are loose

                  Clear out the error

                  Correct impeller static balance

                  Screw the nuts of the foot bolt tightly

                  Correct tile coaxial degree between pump and motor shaft

                   

                  The beating is overheated

                  The grease is not enough or too much or goes bad

                  The pump and the motor shaft is not concentric

                  Clean the bearing and renew the oil

                  Correct the pump and the motor shaft coaxial degree

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