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VERSION 07/2014
OPERATING MANUAL
9
TROUBLESHOOTING, MAINTENANCE, AND REPAIR
9.1
TROUBLESHOOTING AND RECTIFICATION
Problem
The pump does not work.
Poor spray pattern.
Irregular operation of product
pump: spray jet collapses
(pulsation)
Strongly irregular operation
of product pump.
The pump runs evenly, does
not however, suck up product.
ORDER NUMBER DOC2349980
Cause
Air motor does not work or stops.
No pressure indication on the
pressure gauge (air pressure
regulator defective).
Spray nozzle is clogged.
Insuffi cient compressed air supply. Check compressed air supply.
Filter insert in spray gun or high-
pressure fi lter is clogged.
Fluid section or high-pressure
hose is blocked (e.g., 2K product
hardened).
Grease in spool and sleeve
assembly.
Pump stops at the stroke end
occasionally.
See the gun instructions.
Viscosity is too high.
Spraying pressure is too low.
Valves are clogged.
Foreign body in suction valve.
Diameter of compressed air line
too small.
Valves, packings, or pistons are
worn out.
Control air fi lter or work air fi lter is
clogged.
Diaphragms "blocked" because
suction is too fast.
The suction system's union nut is
loose; the pump is taking in air.
Suction fi lter is clogged.
Valves are clogged.
Remedy
Open and close ball valve on the
pressure regulator unit or briefl y
disconnect compressed air supply.
Disconnect compressed air supply
briefl y or repair or change pressure
regulator.
Clean the nozzle according to the
instructions.
Clean the parts and use a suitable
working material.
Dismount and clean fl uid section,
replace high-pressure hose.
Degrease spool and sleeve assembly.
Check detent body.
Thin spraying product.
Increase incoming air pressure.
Use a smaller nozzle.
Press valve depressor.
Clean product pump and leave to
soak in cleaning agent if necessary.
Dismantle suction valve housing,
clean and check valve seat.
Assemble a larger supply line
-> Technical data, see Chapter 5.4.2.
Replace the parts.
Check fi lter and clean it if necessary.
Operate pump with ball valve
opened a minimal amount for a
while.
Tighten.
Clean fi lter.
Press valve depressor.
Clean product pump and leave to
soak in cleaning agent if necessary.
48
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