4Operation
Pay attention to possible faults.
Study the instructions carefully.
4.2 Trouble shooting
NOTE!
Study the maintenance instructions carefully before replacing worn parts. - See section 5.1 General maintenance
Problem
Cause/result
Remedy
Overloaded motor
- Pumping of viscous liquids - Larger motor or smaller impeller
- Pumping of liquids with high density
- Low outlet pressure (counter pressure) - Higher counter pressure (throttling)
- Lamination of precipitates from the
liquid
- Frequent cleaning
- 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
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
20
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