Hardi NAVIGATOR 4000, Instruction Book

Page: 97 / 116

95
7 - Fault finding
Operational Problems
General Info
Operational incidents are often due to the same reasons:
1.
A suction leakage reduces the pump pressure and may interrupt suction completely.
2.
A clogged suction filter may damage suction or interrupt and prevent the pump from running normally.
3.
A clogged pressure filter increases pressure in the fluid system in front of the pressure filter. This may blow the safety
valve.
4.
Clogged in-line filters or nozzle filters increase pressure in the pressure gauge, but it decreases pressure at the nozzles.
5.
Impurities sucked in by the pump may prevent the valves from closing correctly, thus reducing the pump flow.
6.
A bad reassembly of the pump elements, especially the diaphragm covers, causes air intakes or leaks and reduces the
pump flow.
7.
Rusted or dirty hydraulic components cause bad connections and early wears.
8.
A poorly charged or faulty battery causes failure and misbehaviour in the electrical system.
Therefore ALWAYS check that
1.
Suction and pressure filters, as well as nozzles, are clean.
2.
Hoses are free of leaks and cracks, especially suction hoses.
3.
Gaskets and O-rings are present and in good condition.
4.
Pressure gauges are in good working order. Dosage accuracy depends on it.
5.
Operating unit functions properly. Use clean water to check.
6.
Hydraulic components are clean.
7.
The tractor battery and its connectors are in good condition.