23
Ek-2/TL-KLT-01-01 / Rev 0
APPENDIX D (CONTINUED)
TROUBLESHOOTING GUIDE
Problem Cause
What
To
Do
Noise or vibration
in the pump
Cavitation from poor suction
conditions
Make sure all valves are open, look for restrictions
on the suction piping and clean the strainer screen.
Coupling misaligned
Align the coupling.
Coupling or coupling guard loose Tighten the coupling and its guard.
Coupling rubber insert worn or
damaged
Replace the rubber insert and check coupling
alignment.
Worn bearings
Replace if necessary – Lubricate every three months.
Defective or wrong size
By-Pass valve
Confirm the size of the by-pass valve required for your
application. Inspect, repair or replace the valve.
Loose anchor bolts
Tighten all pump’s anchor bolts.
Electric motor gets
hot or overload
protection kicks
out
High differential pressure
Check the motor’s full load amperage. Adjust the by-
pass valve setting to a lower setting. See
recommendations for low capacity due to high
differential pressure.
Low line voltage
Check line voltage when in operation. Be sure motor
is wired for the proper voltage. Check the electric
motor’s nameplate.
Starter overload
Heaters too small
Check the motor load with an ammeter and confirm
the heater size with the starter’s manufacturer.
Motor shorted
Totally Enclosed Fan-Cooled electric motors
(TEFC) and explosion proof electric motors are
subject to moisture condensation inside when
used intermittently. To eliminate moisture you
might allow the motor to operate at least once a
week until it get sufficiently hot to evaporate the
Leaks
Failed O-rings or mechanical seal
assembly
Inspect and replace the seals and O-rings, if needed.