66
HARDI
MEGA 230 / 350 CENTRIFUGAL OPERATORS MANUAL
10.0 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.
•
Poorly reassembled pumps, and pump fittings, will allow the pump to
suck air resulting in reduced or no pumping capacity.
•
Electrical and hydraulic components that are contaminated will result
in poor connections and rapid wear to the hydraulic system.
Therefore ALWAYS check:
1. Suction, pressure 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.
6. Electrical and hydraulic components are maintained clean.
10.1 Nozzle Tubes and Fittings
Poor seals are usually caused by;
• Missing O-rings or gaskets
• Damaged or incorrectly seated O-rings
• Dry or deformed O-rings or gaskets
• Foreign materials
In case of leaks;
DO NOT
overtighten any fittings.(Fig. 44). Disassemble,
check the condition and position of any O-ring or gasket, clean, lubricate
and then reassemble.
For
radial
connections (Fig. 44) only hand tighten them.
