7 - Fault finding
74
Spraying system
FAULT PROBABLE CAUSE VERIFICATION/SOLUTION
No spray reaching the boom. Air being taken in on the suction side. Check that the seal on the suction filter is airtight.
Check the connection and condition of the suction
pipe.
Check the tightening of the pump diaphragms and
cylinder heads.
Air in the system. Put water in the suction pipe to prime it.
Suction/pressure filters blocked. Clean the filters.
Check that the yellow suction pipe is not blocked or
positioned too close to the bottom of the tank.
Lack of pressure Incorrect assembly. "Turbo" valve open.
Yellow suction tube too close to the bottom of the
tank.
Pump valves blocked or worn. Check for obstructions and the state of wear.
Defective pressure gauge. Check for a blockage at the pressure gauge inlet.
Drop in pressure Blocked filters. Clean all the filters. Use cleaner water. If the product is
a powder, switch on agitation.
Worn nozzles. Check the flow and replace the nozzles if there is a
discrepancy in excess of 10%.
Airtight tank. Check that the tank cover vent is free.
Air being sucked in at the end of the tank. Reduce pump rotation.
Increase in pressure. Pressure filters becoming blocked. Clean all the filters.
Formation of foam. Air being taken into the system. Check that all suction connectors (gaskets and rings)
are airtight.
Excessive agitation. Reduce pump rotation.
Check the sealing of the safety valve.
Check returns to the tank.
Use an anti-foaming additive.
Leak at the bottom of the pump. Damaged diaphragm. Replace it. See "Replacing diaphragms and valves".
Regulator does not work or only poorly. Blown fuse(s). Check the mechanical operation of switches. Use a
contact aerosol in the event of oxidation.
Check the motor. 450-500 mA max., otherwise replace
the motor.
Incorrect polarity. Brown positive (+). Blue negative (-).
Control valves do not close correctly. Check the cleanliness of the valves and seats.
Check the position of the micro-switch plate. Loosen
the retaining screws half a turn.
No supply. Incorrect polarity. Check that brown is positive (+).
Blue negative (-).
Check the printed circuit board for loose solder joints
or connections.
Check the contact between the fuse and the fuse
carrier.
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