Liquid System - Hardi COMMANDER DELTA 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.
Operating unit is not functioning, or it is having a
malfunction.
Pump
Liquid leaks from the bottom of the pump.
Grease leaks from the bottom of the pump.
Grease leaks from the shaft grease seals.
Lack of pressure.
Vibrations in system and unpleasant noise from the
pump.
Lack of flow/capacity.
Extreme internal erosion on diaphragm covers and
housing.
Short lifetime for diaphragm.
176
PROBABLE CAUSE
SmartValve/Pressure valve positions are wrong.
Suction/pressure filters are clogged.
No suction from tank.
Incorrect assembly.
Air in system.
Too much agitation.
Pump valves are blocked or worn.
Blocked filters.
Defective pressure gauge.
Filters are clogging.
Nozzles are worn.
Sucking air towards end of tank load.
Pressure filters beginning to clog.
Air is being sucked into system.
Excessive liquid agitation.
Blown fuse(s).
Wrong polarity.
Valves not closing properly.
No power.
Damaged diaphragm.
Grease used has too low viscosity.
Grease used has too low viscosity.
Bearings worn/too high friction.
Pump valves are blocked or defect.
Plugged filters in fluid system.
Pump valves are blocked or defect.
Air is being sucked into system.
Internal wear on conrod and conrod ring.
Pump valves are blocked or defect.
Too high vacuum caused by clogged suction filter or
excessive pump speed (rpm).
Lack of internal cleaning.
Lack of conservation of the fluid system during
storage.
Overspeeding of the pump.
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. Clean if needed.
Boost valve is open (located at the bottom of the
pressure filter).
Fill suction hose with water for initial priming.
Close the agitation valve.
Check for obstructions and wear.
Clean all filters.
Check for dirt at inlet of pressure gauge.
Clean all filters. Fill with cleaner water. If using
powders, make sure agitation is on.
Check flow rate. Replace nozzles, if it exceeds 10%.
Lower pump speed (rpm).
Clean all filters.
Check tightness/gaskets/O-rings of all fittings on
suction side.
Lower pump speed (rpm).
Check safety valve is tight.
Ensure returns inside the tank are present.
Use a foam damping additive.
Check mechanical function of micro switches. Use
cleaning/lubricating agent if the switch does not
operate freely.
Check motor current, max. 450-500 mA. If over,
change the motor.
Brown to positive (+). Blue to negative (-).
Check valve seals for obstructions.
Check micro switch plate position. Loosen the screws
holding the plate a 1/2 turn.
Wrong polarity. Check that brown is positive (+), blue
is negative (-).
Check print plate for dry solders or loose connections.
Check fuse holder is tight around fuse.
Replace diaphragm. See relevant section in this book.
Change to recommended grease type.
Change to recommended grease type.
Replace pump bearings and grease seals.
Check for obstructions or, if needed, replace valves.
Clean filters.
Check for obstructions or, if needed, replace valves.
Check for leaks, pinholes in suction hoses, tightness/
gaskets/O-rings of all fittings on the suction side.
Poor greasing. Replace parts as needed and observe
proper grease quality and intervals.
Check for obstructions or, if needed, replace valves.
Replace affected pump parts.
Clean suction filter and observe maximum pump
speed (rpm).
Use recommended cleaning procedures and add
extra cleaning agents (e.g. AllClearExtra or similar).
Always use a proper mixture of antifreeze during
storage.
Observe maximum pump speed (rpm).