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Operating Instructions
10/2010
1096.0799 | VU / VH Series
35
Defect
Cause
Rectification
Leaking pump
Defective shaft sealing
►
Replace the shaft sealing
Defective casing sealing
►
Provide the vacuum pump with new sealing
Worn-out casing components
►
Replace the affected components
Loosened connecting screws/screw plugs
►
Tighten the screws, replace the sealing
Pump does not run
smooth
Excessive operating liquid flow rate
►
Reduce operating liquid flow rate
Overload in the pipe system
►
Check the pipe connections/pump fixa-
tion/bearing clearance of the pipe clamps
Air pocket in the pipe
►
Change the pipe system layout
Pump distorted/improperly adjusted
►
Check
adjustment/re-adjust
Resonance vibrations in the pipe system
►
Check the pipe connections and, if required,
use a compensator
Imbalanced impeller
►
Balance/replace
impeller
Deposits on the impeller
►
Clean/replace
impeller
Defective pump or motor bearing
►
Replace pump or motor bearing
Tab. 10 Troubleshooting