7 - Fault Finding156Liquid SystemFAULT PROBABLE CAUSE CONTROL / REMEDYNo spray from boom when turned on. SmartValve / Pressure valve positions are wrong. Set correct valve positions for spraying.Suction/pressure filters are clogged. Clean suction and pressure filters.No suction from tank. See if suction fitting in main tank sump is free ofsedimentation. Clean if needed.Lack of pressure. Incorrect assembly. Boost valve has a defect (it is located at the bottomof the pressure filter). The valve seat is worn ormissing.Air in system. Fill suction hose with water for initial priming.Too much agitation. Close the agitation valve.Pump valves are blocked or worn. Check for obstructions and wear.Blocked filters. Clean all filters.Defective pressure gauge. Check for dirt at inlet of pressure gauge.Pressure dropping. Filters are clogging. Clean all filters. Fill with cleaner water. If usingpowders, make sure agitation is on.Nozzles are worn. Check nozzle output. Replace nozzles, if thedeviation in output exceeds 10%.Sucking air towards end of tank load. Lower pump speed (rpm).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 onsuction side.Excessive liquid agitation. Lower pump speed (rpm).Check safety valve is tight.Ensure returns inside the tank are present.Use a foam damping additive.Operating unit is not functioning, or it is having amalfunction.Blown fuse(s). Check mechanical function of micro switches. Usecleaning/lubricating agent if the switch does notoperate freely.Check motor current, max. 450-500 mA. If over,change the motor.Wrong polarity. Brown to positive (+). Blue to negative (-).Valves not closing properly. Check valve seals for obstructions.Check micro switch plate position. Loosen thescrews holding the plate a 1/2 turn.No power. Wrong polarity. Check that brown is positive (+),blue is negative (-).Check print plate for dry solders or looseconnections.Check fuse holder is tight around fuse.
