Correcting Spray Pattern Flaws; Converting The Spray Gun - WALTHER PILOT GA 9010 Manuel D'utilisation Original

5.3

Correcting spray pattern flaws

Spray pattern Description Possible cause
with flaws
Spray pattern uneven Horn orifice on air cap con-
and heavily run spray taminated
mist on one side Faulty air cap
Spray pattern bulging Material flow or viscosity
too much in the centre too high
Spray pattern splitting Atomiser air too high
slightly Material viscosity too low
Crescent-shaped spray Air holes on air cap contami-
pattern nated
Spray pattern heavier on Faulty air cap or material
one side nozzle
No sharp edges,
Atomiser air too low
coarse spray mist
Spray pattern not
circular, Atomiser air too high
insufficient material in Material viscosity too low
the centre
Faulty air cap or material
Misshapen spray pattern
nozzle
Spray pattern too large Material flow or viscosity
and oval too high
Material needle closed too far
Spray pattern not Material viscosity too high
uniform Material nozzle too large
Desired spray result
Remedy
Thoroughly clean the horn
orifices
If necessary, replace air cap
Reduce material flow
Adjust viscosity
Adjust atomiser air and/or
viscosity
Thoroughly clean the air
holes
Replace air cap and/or
material nozzle
Adjust atomiser air
Adjust atomiser air and/or
viscosity
Replace air cap and/or
material nozzle
Reduce material flow
Adjust viscosity
Open material needle wider
Adjust viscosity
Use smaller material
nozzle
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5.4

Converting the spray gun

The air cap/material nozzle/needle combination matching the spraying material
represents an interactively tuned unit - the nozzle set. Always replace the entire
nozzle set to maintain the desired spray pattern quality.
Warning
Before starting any conversion, depressurise the control and atomiser air, as well as
the material supply to the spray gun - risk of injury.
Note
Refer to the exploded view (page 2) and the spare parts list (page 28) of these ope-
rating instructions to perform the specified steps.
Replacing the material nozzle and needle (GA 9010 Marking)
1. Unscrew the sleeve nut (1) and the air cap (2).
2. Unscrew the material nozzle (3) from the front part of the gun (5) (AF 9).
3. Unscrew the raster setting (21) (AF 20) along with the piston spring (20) and the
needle spring (19) from the piston casing (15).
4. Remove the material needle (18) from the piston casing.
Assembly of the material nozzle or the material needle is performed in reverse order.
Replacing the material nozzle and needle (GA 9010 Marking Membrane)
1. Unscrew the sleeve nut (1) and the air cap (2).
2. Unscrew the material nozzle (3) from the front part of the gun (5) (AF 9).
3. Remove the 3 hexagon socket screws (26) from the coupling (25) using a 1.5 mm
hexagon socket key.
4. Unscrew the raster setting (21) (AF 20) along with the piston spring (20) and the
needle spring (19) from the piston casing (15).
5. Remove the piston rod (27) from the piston casing.
6. Unscrew the two hexagon socket screws (4) from the front part using a 3 mm
hexagon socket key and remove the front part from the piston casing.
7. Unscrew the coupling (25) from the clamping bush (23).
8. Unscrew the clamping bush from the front part.
9. Remove the material needle (18) with the backing disc (22) from the front part.
Assembly of the material nozzle or the material needle is performed in reverse order.
Note
The setting dimension of the material needle (18) of the GA 9010 Marking - calcula-
ted from the needle tip to the driving tenon - is x = 94.9 mm.
x
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