A B C D E F G H Possible cause
Remedy
22)
X Tie bolts/gasket defective. Fit new seal between volute casing and
discharge cover.
Re-tighten the bolts.
X Worn shaft seal. Fit new shaft seal.
X X Score marks or roughness on shaft
protecting sleeve / shaft sleeve
Replace shaft protecting sleeve / shaft sleeve.
Fit new shaft seal.
Check the balancing line.
Check throttling bush / throttle sleeve
clearances.
X Lack of cooling liquid or dirty cooling
chamber.
Increase cooling liquid quantity.
Clean out cooling chamber.
Purify/clean cooling liquid.
X X Gland follower too tight or askew. Correct.
X X Pump back pressure is lower than
specified in the purchase order.
Adjust duty point accurately.
X Vibrations during pump operation Correct suction conditions.
Re-align the pump set.
Re-balance the impeller.
Increase pressure at the pump suction nozzle.
X X X The pump set is misaligned. Re-align the pump set.
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 Operating voltage is too low. Increase voltage.
Check voltage drop in the power supply
cable.
X Rotor is out of balance. Clean impeller.
Re-balance impeller.
22)
Pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure.
8 Trouble-shooting
70 of 78
KWP
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