Hardi Mercury Series, Instruction Book

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7 - Fault finding
100
Fluid circuit
FAULT PROBABLE CAUSE POSSIBLE SOLUTION
On activating, the system doesn’t spray Air in the suction line. Check the suction filter o-ring.
Check the suction tube and fittings.
Check the assembly of the pump crankcase covers and
diaphragms.
Air in the system. Prime the pump by filling the hose with water
Suction or pressure filters blocked. Clean the filters
Check the suction fitting and make sure that it is not too close to the
outlet on the tank floor.
Loss of pressure Incorrect assembly The safety valve’s spring is damaged.
The suction fitting is blocked
The suction filter is clogged
Pump valves clogged or worn Check for obstructions and wear
Defective pressure gauge Check for dirt in the intake
Pressure jumps Filters clogged Clean the filters. Clean with clean water. If powdered product is
being used, check that agitation is on.
Worn nozzles Check that the air flow does not exceed 10%.
Tank suction clogged Check the suction tube
Air suction Reduce revolutions in the PTO
Increase in pressure Pressure filters blocked Clean the filters
Foam formed Air in the circuit Check the o-rings, gaskets, hoses and suction fittings
Excessive agitation. Reduce revolutions in the PTO
Check the voltage of the safety valve of the self-cleaning filter
Make sure that there is return to the tank
Use anti-foaming agent
Leak of pump liquid Diaphragms damaged Replace
The operating unit does not work Fuse blown Check the limit switches. Oil with lubricant if the limit switch does
not make proper contact.
Incorrect polarity Control box: Red - pos (+) Black - neg (-).
Solenoid valves: Brown - pos (+). Blue - neg. (-).
The valves do not close correctly. Check for obstructions in the valves
Check the limit switches
No power Incorrect polarity. Brown is pos. (+), Blue is neg. (-)
Check the electric board
Check that the fuse box makes contact with the bracket.