Liquid System - Hardi Ranger 550 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 not functioning.
7.2
PROBABLE CAUSE
Air leak on suction line.
Air in system.
Pressure filters clogged.
Incorrect assembly.
Defective pressure gauge.
Filters clogging.
Nozzles worn.
Tank is air tight.
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.
CONTROL/REMEDY
Check suction hose and fittings.
Bleed air from centrifugal pump.
Clean filters.
Check for obstruction near tank sump elbow fitting.
Check for obstruction near tank sump elbow fitting.
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%.
Check vent in tank lid is clear.
Reduce pump speed.
Clean all filters.
Check tightness/gaskets/O-rings of all fittings on
suction side.
Reduce pump speed.
Ensure returns inside tank are present.
Use foam damping additive.
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 - pos. (+). Blue - neg. (-).
Check valve seals for obstructions.
Check microswitch plate position. Loosen screws
holding plate 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 are tight around fuse.