Page 26 F00636
Troubleshooting
CAUSE CORRECTIVE ACTION
I. ENGINE
A. Speed too low Refer to engine manufacturer’s manual.
B. Rotating and/or reciprocating parts drag Refer to engine manufacturer’s manual.
C. Speed too high Maximum engine speed not to exceed maximum performance
curve speed as shown.
D. Loose or broken parts Refer to engine manufacturer’s manual.
II. PUMP
A. Not primed Reprime. Inspect suction system for air leaks.
B. Flow through pump completely Locate and remove obstruction.
or partially obstructed
C. Internal leakage Check wearing surfaces.
D. Rotating parts drag Inspect. Repair.
E. Case, bracket and/or shaft distorted Refer to installation instruction under “Pipe” and “Foundation”.
F. Impeller Inspect for damage or insufficient diameter for condition.
III. SYSTEM
A. Pressure required by system at design Compare pump pressure and flow rate against pump characteristic curve.
flow rate exceeds pressure rating of pump Reduce system pressure requirement. Increase pressure capability of pump.
B. Obstruction in suction piping Locate and remove obstruction.
C. Suction lift too high Check with gauge or measure vertical distance between water surface and
center line of pump, allowing for friction loss in suction pipe. Reduce rate of flow
to obtain desired lift. Refer to pump characteristic curve.
D. Discharge head too low Decrease rate of flow.
PROBABLE CAUSE
SYMPTOM GROUP I GROUP II GROUP III
ELECTRICAL MECHANICAL SYSTEM
ABC DA BCD E F ABCD
No water delivered X X X X X
Not enough water delivered X X X X X X X
Not enough pressure X X X X X X
Engine heats excessively X X X X X X X X
Abnormal noise and/or vibration X X X X X X X
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