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MAINTENANCE
Pump liquid end does not require any grease or oil for lubrication.
The mechanical seal is lubricated by water when the pump is
operating.
3
Troubleshooting Guide
Performance Chart
Depth to Water
Gallons per Minute at Discharge Pressure
Maximum PSI
15 PSI 25 PSI 35 PSI 45 PSI 50 PSI
0 ft.
- 135 106 72 49 59
5 ft.
144 132 96 63 40 57
10 ft.
142 124 92 52 35 55
15 ft.
139 117 84 42 22 52
20 ft.
136 110 78 36 4 50
25 ft.
133 103 68 28 - 48
SYMPTOM
PROBABLE CAUSE
ENGINE PUMP SYSTEM
A B C D E F G H I J K L M N O P
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 X X X X X X
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 Re-prime, 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 flow rate
exceeds pressure rating of pump
Compare pump pressure and flow rate against pump performance
chart. 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
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