8 Trouble-shooting
61 of 76
CTN / CTN-H
A B C D E F G Possible cause Remedy
24)
- - - - - ✘ - Worn shaft seal Fit new shaft seal.
Check flushing liquid/barrier fluid.
- - - - - ✘ - Vibrations during pump operation Correct suction conditions.
Re-align the pump.
Re-balance the impeller.
Increase pressure at the pump suction nozzle.
- ✘ - ✘ - ✘ - Pump is warped or sympathetic vibrations in
the piping.
Check the piping connections and secure
fixing of pump; if required, reduce distances
between the pipe clamps.
Fix the pipelines using anti-vibration
material.
- - - ✘ - ✘ - Insufficient or excessive quantity of lubricant
or unsuitable lubricant.
Top up, reduce or change lubricant.
✘ ✘ - - - - - Motor is running on two phases only. Replace the defective fuse.
Check the electric cable connections.
- - - - ✘ - - Connection bolts have worked loose. Re-tighten bolts.
Fit new sealing elements.
- - - - - ✘ - Rotor out of balance Clean the impeller.
Re-balance the impeller.
- - - ✘ - ✘ - Defective bearing(s) Replace.
- - - - - ✘ ✘ Flow rate is too low. Increase the minimum flow rate.
✘ - - - - - - Air intake at pump inlet Increase the minimum fluid level.
- - - - - ✘ - System-induced vibrations
25)
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