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Troubleshooting
Introduction
Always commence troubleshooting by checking the general condition
of the spray gun. This can most easily be determined by test spraying,
which provides an opportunity for checking the spray pattern and ca-
pacity, air leakage and gasket leakage.
Troubleshoouting chart
Correct Spray Pattern
Spray Pattern
Asymmetrical to the left or
to the right
Distorted in the middle
Narrowing off in the middle
Irregular spray (spitting)
Paint leaking - Air leaking
Paint leaking
Paint leaking through the paint nozzle
when the gun is closed.
Types of problems
Collection of information which makes it possible to identify the error
symptoms applicable to the spray gun in the event of malfunctioning
is a matter of vital importance. Identification of symptoms makes it pos-
sible to decide whether the spray gun itself is the direct cause of the
malfunctioning or if this may have been caused by an external factor.
The following external factors can cause malfunctioning and should be
thoroughly checked:
1. The quality of the air, i.e. content of moisture, dirt particles and oil.
2. The quality of the paint, i.e. its viscosity, purity. etc.
3 The air and paint pressure in relation to viscosity of the paint and
4. The size of the air/paint hoses.
Cause
a) Dried paint on holes for atomizing air.
b) Damage to holes for atomizing air.
c) Air cap not sufficiently tightened.
a) Damage to the tip of the paint nozzle.
b) The pressure of the atomizing air in relation
to the viscosity of the paint.
a) Wrong nozzle combination.
b) Fan air pressurer too high.
c) Paint viscosity unsuitable.
d) Incorrect spray angle.
a) Paint needle gasket leaky.
b) Damaged O-ring in distributor ring.
c) Paint nozzle not tightened.
d) Dirt on sealing surfaces of paint nozzle and
distributor ring.
e) Paint hose connection not tightened.
f) Paint hose defective.
Cause
Worn needle packings and/or needle.
Pollution between the needle and the nozzle
or needle and nozzle worn or damaged.
nozzle combination used.
Remedy
a) Dried paint on holes for atomizing air.
Clean the air holes, use appropriate clean-
ing agent and a soft brush.
b) Damage to holes for atomizing air.
Replace the air cap with a new one.
c) Air cap not sufficiently tightened.
Tighten the air cap properly by hand.
a) Fit a new paint nozzle.
b) Adjust the air pressure of the atomizing air.
a) Select a new nozzle combination suitable
for the viscosity of paint.
b) Reduce the pressure of the fan air.
c) Adjust the viscosity of the paint.
d) Adjust the angle with the fan width control.
a) Adjust the packing screws. If this does not
suffice, change the paint needle gaskets.
b) Change the O-ring in the distributor ring.
c) Tighten the paint nozzle.
d) Clean the sealing surfaces of the paint
nozzle and distributor ring with solvent and
blow clean.
e) Tighten the paint hose connection.
f) Change the paint hose.
Remedy
Replace damaged parts with new ones.
Unscrew air cap (33) and nozzle (32). Clean
carefully and check for any sign of damages
or wear.
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