Liquid System - Hardi NAVIGATOR 4000 Instruction Book

7 - Fault finding

Liquid System

FAULT
No spray from boom when turned on.
Lack of pressure.
Pressure dropping.
Pressure increasing.
Formation of foam.
Liquid leaks from bottom of the pump.
Vibrations in system and unpleasant noise from the
pump.
Operating unit is not functioning, or it is having a
malfunction.
96
PROBABLE CAUSE
SmartValve positions are wrong.
Suction/pressure filters are clogged.
No suction from tank.
Incorrect assembly.
Air in system.
Too much agitation.
Pump valves are blocked or worn.
Blocked filters
Defective pressure gauge.
Filters are clogging.
Nozzles are worn.
Sucking air towards end of tank load.
Pressure filters beginning to clog.
Air is being sucked into system.
Excessive liquid agitation.
Damaged diaphragm.
Air is being sucked into system.
Blown fuse(s).
Wrong polarity.
Valves not closing properly.
No power.
CONTROL/REMEDY
Set correct valve positions for spraying.
Clean suction and pressure filters.
See if suction fitting in main tank sump is free of
sedimentation. Clean if needed.
Boost valve is open.
Fill suction hose with water for initial priming.
Close the agitation valve.
Check for obstructions and wear.
Clean all filters.
Check for dirt at inlet of pressure gauge.
Clean all filters. Fill with cleaner water. If using
powders, make sure agitation is on.
Check flow rate. Replace nozzles, if it exceeds 10%.
Lower pump speed (rpm).
Clean all filters.
Check tightness/gaskets/O-rings of all fittings on
suction side.
Lower pump speed (rpm).
Check safety valve is tight.
Ensure returns inside the tank are present.
Use a foam damping additive.
Replace diaphragm. See relevant section.
Check for leaks, holes in hoses, tightness/gaskets/O-
rings of all fittings on the suction side.
Check mechanical function of micro switches. Use
cleaning/lubricating agent if the switch does not
operate freely.
Check motor current, max. 450-500 mA. If over,
change the motor.
Brown to positive (+). Blue to negative (-).
Check valve seals for obstructions.
Check micro switch plate position. Loosen the screws
holding the plate a 1/2 turn.
Wrong polarity. Check that brown is positive (+), blue
is negative (-).
Check print plate for dry solders or loose connections.
Check fuse holder is tight around fuse.