7 Troubleshooting
7.1 Operation troubleshooting
Symptom
Cause
Remedy
The pump is not
delivering liquid.
The pump is not primed.
Re-prime the pump and check
that the pump and suction line
are full of liquid.
The suction line is clogged.
Remove the obstructions.
The impeller is clogged.
Back-flush the pump in order to
clean the impeller.
The shaft is rotating in the
wrong direction.
Change the rotation. The rota-
tion must match the arrow on
the bearing housing or pump
casing.
The foot valve or suction pipe
opening is not submerged
enough.
Consult an ITT representative
for the proper submersion depth.
Use a baffle in order to eliminate
vortices.
The suction lift is too high.
Shorten the suction pipe.
The pump is not producing the
rated flow or head.
The gasket or O-ring has an air
leak.
Replace the gasket or O-
ring.
The stuffing box
has an air leak.
Replace or readjust the mechan-
ical seal.
The impeller is
partly clogged.
Back-flush the pump in order to
clean the impeller.
The clearance be-
tween the impel-
ler and the pump
casing is exces-
sive.
Adjust the impeller clearance.
The suction head
is not sufficient.
Make sure that the suction-line
shutoff valve is fully open and
that the line is unobstructed.
The impeller is
worn or broken.
Inspect and replace the impeller
if necessary.
The pump starts
and then stops
pumping.
The pump is not primed.
Re-prime the pump and
check that the pump and
suction line are full of liq-
uid.
The suction line has air or va-
por pockets.
Rearrange the piping in order to
eliminate air pockets.
The suction line has an air
leak.
Repair the leak.
The bearings are
running hot.
The pump and driver are not
aligned properly.
Realign the pump and driver.
There is not sufficient lubrica-
tion.
Check the lubricant for suitability
and level.
The lubrication was not cooled
properly.
Check the cooling system.
The pump is
noisy or vibrates.
The pump and driver are not
aligned properly.
Realign the pump and driver.
The impeller is partly clogged. Back-flush the pump in order to
clean the impeller.
The impeller or shaft is broken
or bent.
Replace the impeller or shaft as
necessary.
7 Troubleshooting
88
Model IC, ICI, ICH, ICIH Installation, Operation, and Maintenance Manual
