1900 Series Horizontal Splitcase Pumps
Instruction and Repair Manual
17
11/12/18
TROUBLESHOOTING:
PUMP:
Your Fairbanks Nijhuis™ pump has been engineered and carefully selected for your application. It should provide years of
trouble-free service. However, any piece of machinery is subject to wear and occasional malfunction.
To help you quickly isolate and rectify any malfunction, the following troubleshooting guide has been prepared.
Frequent use of the chart to determine the cause of minor operating problems may prevent a major problem or possible
breakdown of your pump.
TROUBLE
PROBABLE CAUSE
REMEDY
1. Pump fails to prime or loses its
prime.
a. Air leaks in suction lines.
a. Clean and tighten all suction
prime connections; relocate
suction inlet in liquid source.
b. Suction strainer is clogged.
b. Remove dirt, leaves, or other
material from the strainer.
c. Suction lift is too high.
c. Re-evaluate pump requirements
and correct suction conditions.
d. Defective priming valve.
d. Replace valve.
e. Defective packing or seal.
e. Replace packing or seal.
2. No discharge from pump.
a. Pump is not properly primed.
a. Reprime the pump; refer to priming
troubles and remedies.
b. Total head is too high.
b. Re-evaluate head calculations;
measure elevation differences
between pump and liquid source
and pump discharge point. Consult
your local Fairbanks Nijhuis sales
office.
c. Driver is not operating at rated
speed.
c. Check voltage of electric motor;
check steam pressure of steam
turbine; check engine RPM’s.
Refer to appropriate maintenance
manuals for possible troubles and
corrective action.
d. Impeller or discharge line is
clogged.
d. Back flush pump to clear
obstruction; disassemble pump
and/or piping and remove
obstruction.
e. Wrong direction of rotation.
e. Check wiring against diagram
motor nameplate and in controller;
reverse any two power leads on a
three phase motor, replace a single
phase motor.
f. Pump is vapor bound.
f. Provide additional pressure on
liquid being pumped by elevating
liquid source or pressurizing the
supply tank.
