Model: PWD Rev. B_12/2/2015
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
Pump fails to pump when
a. Pump not completely filled
See that pump is
completely
started.
with fluid.
filled and vented.
b. Loss of suction pressure.
Check suction line
pressure, if
low, check suction strainer
and/or other obstructions.
c. Incorrect rotation.
Verify the driver rotation is
correct.
d. Suction pipe does not have
Verify and correct as
required.
enough submergence.
e. Suction lift exceeding pump
Check pressure with a
capability.
vacuum gage to verify.
Pump does not meet
a. Air entering the suction through
Check for leaks and correct
performance in regards
flange connections or stuffing
as required.
to flow and head.
boxes.
b. Excessive running clearances.
Replace worn parts as
required.
c. NPSH available too low.
Verify suction valve is fully
open and there are no
obstructions such as
clogged
suction
strainer.
d. Broken impeller shroud.
Repair or replace as
required.
Bearing temperature too
a. Not enough lubricant or cooling
Verify both items and
correct
high.
capacity.
as required.
b. Bearings galled or worn
Replace or repair bearings.
excessively.
c. Heat exchanger orifice plugged
First fitting at housing heat
or too small.
exchanger has orifice in
fitting.
Ensure orifice is nor
plugged.
If clear, may need to
increase
orifice size slightly.
Excessive vibration in
a. Coupling alignment is not
Align per procedure
outlined
pump.
correct.
in this manual.