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TROUBLE SHOOTING
34
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38
www.alfalaval.com
9.0.0
Trouble Shooting
Problem
Indication
Possible Cause
Remedy
Leakage
In main flanges.
(inlet and outlet)
Insufficiently tightened.
Tighten.
Damaged gaskets.
Open and check,
change and repair if
necessary.
Valve leakage.
Incorrect assembly or
damaged rubber seat.
Valve body cracked or
Broken.
Remove valve and
check the rubber
seat or foreign
particle or
misalignment, if not,
reassemble valve. If
valve body cracked
or broken, replace
the valve with new
valve.
Shaft seal leakage
Dry run of pump
Incorrect rubber grade
Abrasive particles in
the liquid
Replace:
All wearing parts
(see drawing /parts
list)
Select a different
rubber grade
Select stationary
and rotating
seal ring in Silicon
Carbide/Silicon
Carbide
Pump cavitation
Pressure reduction.
(At times to zero)
Low inlet pressure
High liquid temperature
Increase the inlet
pressure
Increase the liquid
level
Reduce the liquid
temperature
Overloaded
motor
Pumping of viscous
liquids
Pumping of liquids with
high density
Low outlet pressure
(counter pressure)
Change impeller
Higher counter
pressure
(throttling)
CIP unit does
not operate.
No indication.
No power supply.
Check external
power source & turn
on the main power
switch.
