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RUNNING THE ENGINE
Refer to engine operation part of this manual for starting and
operating instructions.
Pump performance varies depending on engine R.P.M.
Refer to engine operation to adjust engine speed.
MAINTENANCE
PUMP LUBRICATION
Pump liquid end does not require any grease or oil for lubri-
cation. The mechanical seal is lubricated by water when the
pump is operating.
3
CAUSE CORRECTIVE ACTION
1. ENGINE
A. Speed too low Refer to engine section
B. Rotating and/or reciprocating parts drag Refer to engine section
C. Speed too high Maximum engine speed not to exceed engine manufacturer’s recommendation.
D. Loose or broken parts Refer to engine section
2. PUMP
E. Not primed Reprime, inspect suction system for air leaks, and or clack assembly.
F. Pump takes too long to prime Check for air leaks or defective check valve.
G. Flow through pump completely Locate and remove obstruction. Attach strainer.
or partially blocked
H. Internal leakage Check clearances between face of vanes and case. Should not exceed 1/32".
I. Rotating parts drag Inspect. Repair.
J. Loose or broken parts Inspect. Repair.
3. SYSTEM
K. Pressure required by system at design Compare pump pressure and flow rate against pump performance chart.
flow rate exceeds pressure rating of pump Reduce system pressure requirement. Increase pressure capability of pump.
L. Obstruction in suction piping Locate and remove obstruction. Attach strainer.
M. 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 performance chart.
N. Discharge head too low Decrease rate of flow
O. Suction inlet not immersed deep enough Refer to “Installation”
P. Leaky suction line or connection admitting air Repair or replace suction line. Tighten connections.
PROBABLE CAUSE
SYMPTOM ENGINE PUMP SYSTEM
ABCDEFGH I JKLMNOP
No water delivered X X 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
Abnormal noise and/or vibration X X X X X X X
Pump works for a while, then stops XXXXXX
Troubleshooting Guide
Depth Gallons per Minute at Discharge Pressure Maximum
to Water 15 PSI 25 PSI 35 PSI 45 PSI 50 PSI PSI
0 ft. 141 120 95 65 50 58
5 ft. 130 110 85 55 40 55
10 ft. 121 100 75 45 25 52
15 ft. 113 90 65 30 2 50
20 ft. 105 80 55 7 – 48
25 ft. 80 60 40 2 – 45
Performance Chart