Hardi COMMANDER TWIN FORCE Series, Instruction Book

Page: 92 / 110

7 - Fault finding
7.2
CONTROL/REMEDY
Air 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 CAUSE
Check if suction filter O-ring is sealing.
Check suction tube and fittings.
Check tightness of pump diaphragm and valve covers.
Boost valve is open.
Safety valve spring for Self-cleaning filter not tight.
Too little distance between yellow suction pipe and tank bot-
tom.
Clean all filters. Fill with cleaner water. If using powders, make
sure 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. Use
cleaning/lubricating agent if the switch does not operate free-
ly.
Check motor. 450-500 milli-Amperes max. Change motor, if
over.
Liquid system
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.
FAULT
Air in system.
Pump valves blocked or worn.
Nozzles worn.
Excessive liquid agitation.
Wrong polarity.
Fill suction hose with water for initial prime.
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.
Ensure returns inside tank are present.
Use foam damping additive.
Brown - pos. (+). Blue - neg. (-).
Suction/pressure filters clogged.
Defect pressure gauge.
Tank is air tight.
Valves not closing properly.
Clean filters.
Check yellow suction pipe is not obstructed or placed too
near the tank bottom.
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 holding
plate a 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.