Troubleshooting
Fault number
1
2
3
4
5
6
7
8
Cause
Remedy
–
–
X
–
X
X
–
X
Motor speed too high
Compare the required motor speed with
the specifications on the pump type
plate. Replace the motor if necessary.
Reduce the motor speed if speed control
is available.
–
–
X
–
X
X
–
X
Impeller diameter too large
Throttle down the flow rate at the
pressure-side fitting. Observe the
minimum flow rate.
Machine the impeller down. Consult the
manufacturer and adjust the impeller
diameter.
X
X
–
X
–
X
–
–
Impeller out of balance or blocked
Dismount the pump and inspect it for
dry-running damage.
Clean the impeller.
–
X
–
X
–
X
–
–
Hydraulic parts of the pump dirty, clotted or
encrusted
Dismount the pump.
Clean the parts.
–
–
–
–
–
X
–
X
Plain bearing faulty
Replace plain bearing.
–
–
–
–
–
–
–
X
Defective antifriction bearing in motor
Replace the antifriction bearing
(
→
manufacturer's specifications).
–
–
–
–
–
–
–
–
Lubricant: too much, too little or unsuitable
Reduce, add to or replace lubricant.
–
–
–
–
–
–
X
–
Connecting bolts not correctly tightened
Tighten the connecting bolts.
–
–
–
–
–
–
X
–
Faulty housing seal
Replace the housing seal
–
–
–
–
–
X
X
X
Pump distorted
Check the pipe connections and pump
attachment.
Check alignment of coupling.
Check attachment of the support foot.
–
X
–
X
–
X
–
X
Motor running on 2 phases
Check the fuse and replace it if
necessary.
Check the cable connections and
insulation.
Tab. 6
Troubleshooting list
28
SHM
BA-2018.08.21 EN
300 092
