17
Fault Probable cause Control / remedy
Check suction tube and fittings.
Check tightness of pump diaphragm
and valve covers.
Fill suction hose with water for initial
prime.
Clean filters.
Recheck assembly.
Check for obstructions and wear.
Check for dirt at inlet of gauge.
Clean all filters. Fill with cleaner
water.
Check flow rate and replace nozzles
if it exceeds 10%.
Check vent is clear.
Clean all filters.
Check tightness / gaskets / O-rings
of all fittings on suction side.
Use foam damping additive.
Replace. See section Changing
valves and diaphragms.
No spray from
blower when
turned on.
Lack of
pressure.
Pressure
dropping.
Pressure
increasing.
Formation of
foam.
Liquid leaks
from bottom of
pump.
Air leak on suction.
Air in system.
Suction / nozzle
filters clogged.
Incorrect assembly.
Pump valves blocked
or worn.
Defect pressure gauge.
Filters clogging.
Nozzles worn.
Tank is airtight.
Nozzle filters begin-
ning to clog.
Air is being sucked
into system.
Excessive liquid
agitation.
Damaged diaphragm.
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