Hardi JAZZ, Instruction Book

Page: 21 / 36

21
Operational problems
In cases where breakdowns have occurred the same factors always seem
to come into play:
• Minor leaks on the suction side of the pump will reduce the pump
capacity or stop the suction completely.
• A clogged suction filter will hinder or prevent suction so that the pump
does not operate satisfactorily.
• Clogged up pressure filters will result in increasing pressure at the
pressure gauge but lower pressure at the nozzles.
• Foreign bodies stuck in the pump valves with the result that these
cannot close tightly against the valve seat. This reduces pump effi-
ciency.
• Poorly reassembled pumps, especially diaphragm covers will allow the
pump to suck air resulting in reduced or no capacity.
Therefore ALWAYS check:
1. Suction and nozzle filters are clean.
2. Hoses for leaks and cracks, paying particular attention to suction hoses.
3. Gaskets and O-rings are present and in good condition.
4. Pressure gauge is in good working order. Correct dosage depends on it.
5. Operating unit functions properly. Use clean water to check.