7 - Fault finding
96
Liquid system
FAULT PROBABLE CAUSE CONTROL/REMEDY
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. Boost valve is open.
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 clogging. 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 exceeds 10%.
Tank is air tight. Check vent in tank lid is clear.
Sucking air towards end of tank load. Lower pump r.p.m.
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 r.p.m.
Check safety valve is tight.
Ensure returns inside tank are present.
Use foam damping additive.
Liquid leaks from bottom of pump. Damaged diaphragm. Replace. See changing of valves and diaphragms.
Operating unit not functioning or having
malfunction.
Blown fuse(s). 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.
Wrong polarity. Brown - positive (+). Blue - negative (-).
Valves not closing properly. Check valve seals for obstructions.
Check microswitch plate position. Loosen screws
holding plate a 1/2 turn.
No power. 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.
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