59
A B C D E F G H Possible cause
Remedy
18)
X X
Score marks or roughness on shaft
protecting sleeve / shaft sleeve
Replace shaft protecting sleeve / shaft sleeve.
Fit new shaft seal.
X
Vibrations during pump operation.
Correct suction conditions.
Re-align the pump.
Re-balance the impeller.
Increase pressure at the pump suction nozzle.
X
X X
The pump set is misaligned.
Re-align.
X
X X
Pump is warped or sympathetic
vibrations in the piping.
Check pipeline connections and secure fixing
of pump; if required, reduce the distances
between the pipe clamps.
Fix the pipelines using anti-vibration material.
X X
Insufficient or excessive quantity of
lubricant or unsuitable lubricant.
Top up, reduce or change lubricant.
X
Non-compliance
with
specified
coupling distance.
Correct distance according to the general
arrangement drawing.
X X
Motor is running on two phases only.
Replace the defective fuse.
Check the power cable connections.
X
Rotor is out of balance.
Clean the impeller.
Re-balance the impeller.
X
Defective bearing(s)
Fit new bearing(s).
X X Insufficient flow rate
Increase the minimum flow rate.
X
Incorrect inflow of circulation liquid.
Increase the free cross-section.
18) Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
8 Trouble-shooting
