7 - Fault finding
7.2
Liquid system
FAULT PROBABLE CAUSE CONTROL/REMEDY
No spray from boom when turned on. Air leak on suction line. Check suction hose and fittings.
Air in system. Bleed air from centrifugal pump.
Pressure filters clogged. Clean filters.
Check for obstruction near tank sump elbow fitting.
Lack of pressure. Incorrect assembly. Check for obstruction near tank sump elbow fitting.
Defective 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. Reduce pump speed.
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 speed.
Ensure returns inside tank are present.
Use foam damping additive.
Operating unit not functioning. 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 - pos. (+). Blue - neg. (-).
Valves not closing properly. Check valve seals for obstructions.
Check microswitch plate position. Loosen screws
holding plate 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 are tight around fuse.
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