44 HARDI
®
New NAVIGATOR OPERATOR’S MANUAL
FAULT
No spray from boom when
turned on.
Lack of pressure.
Pressure dropping.
Pressure increasing
Formation of foam.
Liquid leaks from bottom
of pump.
Excessive hose vibrations.
Liquid system
PROBABLE CAUSE
Air leak on suction line.
Air in system (ECPC).
Suction/pressure fi lters
clogged.
Incorrect assembly.
Pump valves blocked or worn.
Defect pressure gauge.
Filters clogging.
Nozzles worn.
Tank is air tight.
Sucking air towards end of
tank load.
Pressure fi lters beginning to
clog.
Air is being sucked into sys-
tem.
Excessive liquid agitation.
Damaged diaphragm.
Suction side air leak.
CONTROL/REMEDY
Check if suction fi lter O-ring is sealing.
Check suction tube and fi ttings.
Check tightness of pump diaphragm and valve
covers.
Bleed air from centrifugal pump.
Clean fi lters.
Check yellow suction pipe is not obstructed or
placed too near the tank bottom.
Restrictor nozzle in Self-Cleaning Filter not
fi tted.
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 fi lters. Fill with cleaner water.
If using powders, make sure agitation is on.
Check fl ow rate and replace nozzles if it ex-
ceeds 10%.
Check vent is clear.
Lower pump r.p.m.
Clean all fi lters.
Check tightness / gaskets / O-rings of all fi t-
tings on suction side.
Reduce pump r/min.
Check safety valve for Self-Cleaning Filter is
tight.
Ensure returns inside tank are present.
Use foam damping additive.
Replace. See Changing of valves and di a -
phragms.
Check for cracked hose, loose clamps or bad
suction valve.
Troubleshooting