8 Trouble-shooting
46 of 52
Etaline-R
A B C D E F G H Possible cause
Remedy
10)
✘
Density or viscosity of fluid handled
higher than stated in purchase order
11)
✘
Use of unsuitable shaft seal materials
Change the material combination.
10)
✘ ✘
Speed is too high.
Reduce speed.
10)
✘
Tie bolts/sealing element defective
Fit new seal between volute casing and
discharge cover.
Re-tighten the bolts.
✘
Worn shaft seal
Fit new shaft seal.
✘
✘
Score marks or roughness on shaft sleeve Fit new shaft sleeve.
Fit new shaft seal.
✘
Dismantle to find out.
Correct.
Fit new shaft seal, if required.
✘
Vibrations during pump operation
Correct suction conditions.
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.
✘
Increased axial thrust
Clean balancing holes in the impeller.
Fit new casing wear rings.
✘
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.
Check the motor winding.
✘
Rotor out of balance
Clean the impeller.
Re-balance the impeller.
✘
Defective bearing(s)
Fit new bearing(s).
✘
✘ ✘
Flow rate is too low
Increase the minimum flow rate.
✘
Incorrect setting of motor protection
switch
Check setting.
Fit new motor protection switch.
✘ ✘
Transport lock has not been removed
from the shaft groove.
Remove.
11)
Please contact KSB.
