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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.
7.2
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 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.
Restrictor nozzle in Self-Cleaning Filter not fitted.
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 exceeds 10%.
Check vent in tank lid is clear.
Lower pump r.p.m.
Clean all filters.
Check tightness/gaskets/O-rings of all fittings on suction side.
Reduce pump r.p.m.
Check safety valve is tight.
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 free-
ly.
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 a 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 are tight around fuse.
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