Hardi Ranger Series Instruction Book

Contents

7 - Fault finding7.2CONTROL/REMEDYAir leak on suction line.Incorrect assembly.Filters clogging.Pressure filters beginning to clog.Air is being sucked into system.Damaged diaphragm.Blown fuse(s).PROBABLE CAUSECheck if suction filter O-ring is sealing.Check suction tube and fittings.Check tightness of pump diaphragm and valve covers.Check for obstruction near tank sump elbow fitting.Clean all filters. Fill with cleaner water. If using powders, makesure agitation is on.Clean all filters.Check tightness/gaskets/O-rings of all fittings on suction side.Replace. See changing of valves and diaphragms.Check mechanical function of microswitches. Usecleaning/lubricating agent if the switch does not operatefreely.Check motor. 450-500 milli-Amperes max. Change motor, ifover.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.FAULTAir in system (Centrifugal pump).Pump valves blocked or worn.Nozzles worn.Excessive liquid agitation.Wrong polarity.Bleed air from centrifugal pump.Check for obstructions and wear.Check flow rate and replace nozzles if it exceeds 10%.Reduce pump r.p.m.Check safety valve is tight (diaphragm systems only).Ensure returns inside tank are present.Use foam damping additive.Brown - pos. (+). Blue - neg. (-).Suction/pressure filters clogged.Defective pressure gauge.Tank is air tight.Valves not closing properly.Clean filters.Check for obstruction near tank sump elbow fitting.Check for dirt at inlet of gauge.Check vent in tank lid is clear.Check valve seals for obstructions.Check microswitch plate position. Loosen screws holdingplate 1/2 turn.Sucking air towards end of tank load.No power.Lower pump r.p.m.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.Liquid systemMake sure bottom valve on CycloneFilter is not left in closedposition (marked with 1 dot) after flushing boom. Operatingposition (marked with 2 dots) keeps CycloneFilter clean.