Liquid System - Hardi COMMANDER TWIN FORCE Instruction Book

7 - Fault finding

Liquid system

FAULT
No spray from boom when turned on.
Lack of pressure.
Pressure dropping.
Pressure increasing.
Formation of foam.
Liquid leaks from bottom of pump.
Vibrations in system and unpleasant noise from
pump.
Operating unit not functioning or having
malfunction.
108
PROBABLE CAUSE
SmartValve positions wrong.
Suction/pressure filters clogged.
No suction from tank.
Incorrect assembly.
Air in system.
Too much agitation.
Pump valves blocked or worn.
Blocked filters
Defect pressure gauge.
Filters clogging.
Nozzles worn.
Sucking air towards end of tank load.
Pressure filters beginning to clog.
Air is being sucked into system.
Excessive liquid agitation.
Damaged diaphragm.
Air is being sucked into system.
Blown fuse(s).
Wrong polarity.
Valves not closing properly.
No power.
CONTROL/REMEDY
Set correct valve positions for spraying.
Clean suction and pressure filters.
See if suction fitting in main tank sump is free of
sedimentation.
Boost valve is open.
Fill suction hose with water for initial prime.
Close the agitation valve.
Check for obstructions and wear.
Clean all filters.
Check for dirt at inlet of gauge.
Clean all filters. Fill with cleaner water. If using
powders, make sure agitation is on.
Check flow rate and replace nozzles if it exceeds 10%.
Lower pump r.p.m.
Clean all filters.
Check tightness/gaskets/O-rings of all fittings on
suction side.
Reduce pump r.p.m.
Check safety valve is tight.
Ensure returns inside tank are present.
Use foam damping additive.
Replace. See changing of valves and diaphragms.
Check for leaks, holes in hoses, tightness/gaskets/O-
rings of all fittings on suction side.
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.
Brown to positive (+). Blue to negative (-).
Check valve seals for obstructions.
Check microswitch plate position. Loosen screws
holding plate a 1/2 turn.
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.