20
HARDI NAVIGATOR
Problem Probable cause Control / Solution
Liquid system
No spray from boom
when turned on
Air leak on suction line Check if suction filter O-ring is sealing
Check suction tube and fittings
Check tightness of pump diaphragm and valve
covers
Air in system Fill suction hose with water for initial prime
Suction / pressure filters clogged Clean filters
Check yellow suction pipe is not obstructed or
placed too near the tank bottom
Lack of pressure Incorrect assembly Restrictor nozzle in self cleaning filter not fitted
or incorrectly aligned
Safety valve spring for self cleaning filter not
tight
Too little distance between yellow suction pipe
and tank bottom
Pump valves blocked or worn Check for obstructions and wear
Defect pressure gauge Check for dirt at inlet of gauge
Pressure dropping Filters clogged Clean all filters. Fill with cleaner water
If using powders, make sure agitation is on
Nozzles worn Check flow rate and replace nozzles if it ex-
ceeds 10% variation from nominal rate
Tank is air tight Check vent is clear
Sucking air towards end of tank load Lower pump rpm
Pressure increasing Pressure filters beginning to clog
Clean all filters
Formation of foam Air is being sucked into system Check tightness/gaskets/O-rings of all fittings on
suction side
Excessive liquid agitation Reduce pump rpm
Check safety valve for self cleaning filter is tight
Ensure returns inside tank are present
Use foam damping additive
Liquid leaks from bottom
of pump
Damaged diaphragm Replace. See
Changing valves
and
Changing
diaphragms
(Page 13)
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