Maintenance
Troubleshooting
Engine Drive Pumps
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| PROBABLE CAUSE |
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| SYMPTOM |
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| GROUP I |
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| GROUP II |
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| GROUP III |
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| ENGINE |
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| MECHANICAL |
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| SYSTEM |
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| A | B | C | D | E |
| F | A | B | C | D | E | F | A | B | C |
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| Pump runs, but no water delivered |
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| X |
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| X |
| X |
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| Not enough water delivered |
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| X |
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| X | X |
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| X |
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| X |
| X |
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| Not enough pressure |
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| X |
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| X | X |
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| X |
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| X |
| X |
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| Excessive vibration |
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| X | X | X |
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| X | X |
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| X |
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| X |
| X |
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| Abnormal noise |
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| X | X | X |
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| X | X |
| X |
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| X | X |
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| X |
| X |
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| Pump stops |
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| X |
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| X |
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| Overheating |
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| X | X | X | X |
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| X |
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| X |
| X | X |
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| X |
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| CAUSE |
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| CORRECTIVE ACTION |
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I. ENGINE |
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A. Speed too low |
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| Refer to engine manufacturer’s manual. |
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B. Rotating and/or |
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| Refer to engine manufacturer’s manual. |
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reciprocating parts drag |
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C. Speed too high |
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| Refer to pump and engine power curves. Adjust. |
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D. Loose or broken parts |
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| Refer to engine manufacturer’s manual. |
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E. Improper adjustment |
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| Check fuel and ignition systems. Adjust per engine manufacturer’s manual. | ||||||||||||||||||||
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F. Fuel supply |
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| Check fuel supply, fuel pump, filters, etc. |
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II. MECHANICAL |
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A. Flow through pump completely or |
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| Locate and remove obstruction. Refer to Repair Instructions |
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partially obstructed |
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| for disassembly. |
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B. Wrong direction of rotation |
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| Reverse rotation of three phase motor by interchanging any two leads. | ||||||||||||||||||||
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| See manufacturer’s Instructions for reversing single phase motor. |
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C. Pump not primed |
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| Reprime. Inspect suction system for air leaks. |
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D. Internal leakage |
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| Check impeller for wear of controlled clearances (See Repair Instructions). | ||||||||||||||||||||
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E. Loose parts |
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| Inspect. Repair. |
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F. Stuffing box not properly adjusted |
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| Adjust gland. |
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III. SYSTEM |
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A. Pressure required by system at design |
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| Compare pump pressure and flow rate against pump characteristic curve. | ||||||||||||||||||||
flow rate exceeds pressure rating of pump |
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| Check for closed or partially closed valve in discharge piping system. | |||||||||||||||||||||
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| Reduce system pressure requirement. Increase pressure capability of pump. | ||||||||||||||||||
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B. Obstruction in suction piping |
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| Locate and remove obstruction. |
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C. Pressure rating of pump exceeds pressure |
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| Compare pump pressure and flow rate against pump characteristic curve. | |||||||||||||||||||||
requirement of system at design flow rate |
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| Inspect discharge piping system for breaks, leaks, open | |||||||||||||||||||||
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| If necessary, reduce flow rate by partially closing discharge valve. |
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F00633 | Page 21 |
