Liquid System - Hardi NAVIGATOR 3000 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 pump.
Operating unit not functioning or having
malfunction.
7.2
PROBABLE CAUSE
Air leak on suction line.
Air in system (Centrifugal pump).
Suction/pressure filters clogged.
Incorrect assembly.
Pump valves blocked or worn.
Defective pressure gauge.
Filters clogging.
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.
Blown fuse(s).
Wrong polarity.
Valves not closing properly.
No power.
CONTROL/REMEDY
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.
Boost valve is open.
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 exceeds 10%.
Check vent in tank lid is clear.
Lower pump r.p.m.
Clean all filters.
Make sure bottom valve on CycloneFilter is not left in
closed position (marked with 1 dot) after flushing
boom. Operating position (marked with 2 dots) keeps
CycloneFilter clean.
Check tightness/gaskets/O-rings of all fittings on
suction side.
Reduce pump r.p.m.
Check safety valve is tight (diaphragm systems only).
Ensure returns inside tank are present.
Use foam damping additive.
Replace. See changing of valves and diaphragms.
Check mechanical function of microswitches. Use
cleaning/ lubricating agent if the switch does not
operate freely.
Check motor. 450-500 milli-Amperes max. Change
motor, if over.
Brown - pos. (+). Blue - neg. (-).
Check valve seals for obstructions.
Check microswitch plate position. Loosen screws
holding plate 1/2 turn.
Wrong polarity. Check that brown is pos. (+), Blue is
neg. (-).
Check print plate for dry solders or loose connections.
Check fuse holder is tight around fuse.