8 Trouble-shooting
69 of 80
HPK
1121.8/06-EN
A B C D E F G H Possible cause
Remedy
18)
- ✘ - - - - ✘ - Pump back pressure is lower than
specified in the purchase order.
Re-adjust to duty point.
In the case of persistent overloading, turn
down impeller.
19)
- ✘ - - - - - - Density or viscosity of fluid handled
higher than stated in purchase order
Contact KSB.
- ✘ - - - ✘ - - Gland follower over-tightened or cocked Correct.
- ✘ ✘ - - - - - Speed is too high.
Reduce speed.
19)
- - - - ✘ - - - Defective gasket Fit new gasket between volute casing and
casing cover.
- - - - - ✘ - - Worn shaft seal Fit new shaft seal.
Check flushing liquid/barrier fluid.
✘ - - - - ✘ - - Score marks or roughness on shaft
protecting sleeve / shaft sleeve
Replace shaft protecting sleeve/shaft sleeve.
Fit new shaft seal.
- - - - - ✘ - - Vibrations during pump operation Correct suction conditions.
Re-align the pump.
Re-balance the impeller.
Increase pressure at the pump suction nozzle.
- - - ✘ - ✘ ✘ - The pump set is misaligned. Re-align.
- - - ✘ - ✘ ✘ - 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.
- - - ✘ - - - - Non-compliance with specified coupling
distance
Correct the distance according to general
arrangement drawing.
✘ ✘ - - - - - - Motor is running on two phases only. Replace the defective fuse.
Check the electric cable connections.
- - - - - - ✘ - 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.
- - - - - ✘ - - Incorrect inflow of circulation liquid Increase the free cross-section.
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