Alfalaval LKHex UltraPure 10, Instruction Manual

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4 Operation
Pay attention to possible faults.
Study the instructions carefully.
4.4 Trouble shooting
NOTE!
Study the maintenance instructions carefully before replacing worn parts.
Problem Cause/result
Remedy
Overloaded motor - Pumping of viscous liquids - Larger motor or smaller impeller
- Pumping of high density liquids
- Low outlet pressure (counter pressure) - Higher counter pressure (throttling)
- Lamination of precipitates from the
liquid - Frequent cleaning
Cavitation:
-
Damage - Low inlet pressure - Increase the inlet pressure
- Pressure reduction (sometimes to
zero)
- High liquid temperature - Reduce the liquid temperature
- Increasing of the noise level - Reduce the pressure drop before the
pump
- Reduce speed
Leaking shaft seal - Dry run Replace:
All wearing parts
- Incorrect rubber grade If necessary:
-
Change rubber grade
- Abrasive particles in the liquid
- Select stationary and rotating seal ring
in silicon carbide/silicon carbide
Leaking O-ring seals Incorrect rubber grade Change rubber grade
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