MAINTENANCE
Troubleshooting
8
Troubleshooting
Problem Probable Causes Corrective Action
Pump fails
to deliver
water
Pump not completely primed Prime pump. Refer to “
Operation” on page 6.
Speed too low
Employ a certified electrician to check volt-
age at motor terminals and at meter when
pump is operating. If low, refer to wiring
instructions or check with your power com-
pany. Check loose connections.
Total head exceeds pump rating Reduce total head or use a high head pump.
Suction lift is greater than recommended
Relocate the pump closer to the water
source.
Pump
delivers
water, but
not at
rated
capacity
Air pockets or leaks in suction or discharge
line.
Inspect the suction and discharge lines.
Clean or replace as needed.
Clogged impeller. Remove impeller and clean.
Excessively worn impeller. Replace impeller.
Strainer is too small or clogged. Use larger strainer or clean.
Insufficient submergence of suction line.
Adjust installation so that the end of the suc-
tion line remains well below the water sur-
face.
Suction lift is greater than recommended
Relocate the pump closer to the water
source.
Total head exceeds pump rating Reduce total head or use a high head pump.
Pump
loses
prime
Air leaks in suction line
Inspect suction line. Repair or replace as
needed.
Excessive lift and operating too near shut-off
point
Relocate the pump closer to the water
source.
Water level drops while pumping, uncover-
ing suction piping
Check water supply. Add length of pipe to
suction to keep submerged end under water,
or move the pump closer to source of liquid.
Mechani-
cal trou-
bles and
noise
Bent shaft and/or damaged bearings Take motor to authorized motor repair shop.
Suction and/or discharge piping not properly
supported and anchored
See that all piping is supported to relieve
strain on pump assembly.
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