| Problem |
Cause |
Solution |
| Pump is running but does not reach operating pressure |
Pump is sucking in air |
Check inlet ducts and make sure they are air-tight |
| Valves are worn |
Check and replace |
| Regulating valve seats worn |
Check and replace |
| Nozzle inadequate or worn |
Check and replace |
| Seals worn |
Check and replace |
| Pump not drawing water |
Pump is sucking in air |
Check inlets and make sure they are air-tight |
| Suction level too low |
Check inlet water level |
| Inlet valves dirty |
Disassemble and clean the inlet valves or connect the pump inlet to the water mains and pump for a few minutes |
| Irregular pressure oscillation |
Inlet and/or outlet valves worn |
Check and replace |
| Foreign matter stuck in the valves |
Check and clean valves |
| Pump is sucking in air |
Check inlet ducts and make sure they are air-tight |
| Water seals worn |
Check and/or replace seals |
| Nozzle too small |
Change nozzle to correct size |
| Drop in pressure |
Nozzle worn |
Change nozzle |
| Inlet and/or outlet valves worn |
Check and/or replace valves, check and clean valves |
| Foreign matter present in the valves jeopardizing their functioning |
Check and/or replace the regulating valve seat |
| Regulating valve seat worn |
Replace |
| Water seals worn |
Replace seals |
| Excessive noise |
Pump not being fed correctly |
Check that the suction level is not too low or that the suction pipes are not blocked (e.g., filter clogged) |
| Pump is sucking in air |
Check inlet ducts and make sure they are air-tight |
| Inlet and/or outlet valve springs damaged or broken |
Replace valve springs |
| Foreign matter in inlet/outlet valves |
Check and clean the inlet/outlet valves |
| Bearings worn |
Bearings worn Replace bearings |
| Fluid temperature too high |
Reduce the temperature of the pumped fluid |
| Water traces in oil |
Excessive leaks caused by totally worn water seals |
Replace seals |
| High humidity rate in air |
Change oil twice as often as recommended |
| Running in through the dip stick |
Keep pump out of heavy rain, do not spray directly onto pump |
| Water seeping from drains between head and crankcase |
Water seals worn |
Replace seals |
| Piston damaged |
Replace piston |
| O-ring on piston bolt worn |
Replace O-ring |
| Oil seeping from drains between head and crankcase |
Oil seals worn |
Replace oil seals |
| Frequent or premature wear of water seals |
Pistons damaged or scratched |
Replace pistons |
| Abrasive matter in water |
Install the proper filter on the inlet side |
| Water temperature too high |
Check temperature of inlet water |
| Pump running dry |
Avoid running pump without water |
| Operates for long periods in by-pass |
Limit by-pass mode running to no more than 5 min |
| Excessive vibrations at outlet hose/pipe |
Valves worn or dirty |
Check and replace |
| Pump is sucking in air |
Check inlet ducts and make sure they are air-tight |
| Water seals worn |
Replace water seals |