Trouble Shooting - Alfa level LKH UltraPure-60 Instruction Manual

4 Operation
Pay attention to possible faults.
Study the instructions carefully.

4.2 Trouble shooting

NOTE!
Study the maintenance instructions carefully before replacing worn parts.
Problem
Overloaded motor
Cavitation:
- Damage
- Pressure reduction (sometimes to
zero)
- Increasing of the noise level
Leaking shaft seal
Leaking O-ring seals
16
Cause/result
- Pumping of viscous liquids
- Pumping of high density liquids
- Low outlet pressure (counter pressure) - Higher counter pressure (throttling)
- Lamination of precipitates from the
liquid
- Low inlet pressure
- High liquid temperature
- Dry run
- Incorrect rubber grade
- Abrasive particles in the liquid
Incorrect rubber grade
Remedy
- Larger motor or smaller impeller
- Frequent cleaning
- Increase the inlet pressure
- Reduce the liquid temperature
- Reduce the pressure drop before the
pump
- Reduce speed
Replace:
All wearing parts
If necessary:
- Change rubber grade
- Select stationary and rotating seal ring
in silicon carbide/silicon carbide
Change rubber grade