Fluid System; Spraying Operation; Interrupted Spraying And Standby Mode - Hardi Navigator Series Maintenance And Service Manual

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