Correcting Spray Pattern Flaws - WALTHER PILOT PREMIUM FB Betriebsanleitung

6.1

Correcting spray pattern flaws

The following table shows the settings you can use to change the spray pattern.
Spray pattern test Deviation
Spray pattern is split in
the centre
Spray pattern is too thick
at the ends
The spray pattern shows
rather large droplets
Material application in
the centre of the spray
pattern is very thin
Spray pattern is split in
the centre
Spray pattern is very
spherical
7 Troubleshooting and fault rectification
Warning
Before each change-over depressurize the spray air as well as the material supply to
the spray gun - risk of injury.
Fault Cause
Gun drips Material needle or nozzle dirty or
damaged
Spring cap (item 13) turned too far
back
Pulsating or insufficient material in the material
shimming spray container
beam
Cup is tilted too much during the
spraying process
Material nozzle loose or damaged
The material is too heavy for the
suction supply
Gun emits spray Valve spring (item 25) or valve
in idle position cone (item 24) damaged
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desired spray result
Required adjustment
• setting a wider spray pattern
• Setting a more rounded spray
pattern
• Decrease the nozzle air pres-
sure
• Decrease the nozzle air pres-
sure
• Increase the nozzle diameter
• Reduce nozzle air pressure
• Increase material pressure
• Reduce material pressure
• Increase nozzle air pressure
Remedy
• Clean or replace
• Slightly turn down the
adjustment screw (clock-
wise)
• Refill the material
• Hold straighter
• Tighten, if necessary,
replace air distributor ring
(item 5)
• Use pressure tank or
pump system for delivery
• replace
8 Conversion and repair
If you want to change the spray pattern beyond the options already mentioned,
the spray gun must be converted. The air cap / material nozzle / needle combina-
tion matching the spraying material represents an interactively tuned unit - the
nozzle insert. Always replace the entire nozzle insert to maintain the desired spray
pattern quality.
Warning
Interrupt the air and material supply to the spray gun before each conversion or
repair - risk of injury.
Note
Please refer to the exploded view at the beginning of these operating instructions
to perform the work steps listed below.
Changing the material nozzle and air head
1. Unscrew the air head nut (item 1).
2. Remove the air head (item 2).
3. Unscrew the material nozzle (item 3) with a wrench size 11 from the gun body.
Note
The seal (item 4) must thereby be located on the nozzle.
The assembly of the new nozzle insert as well as of the remaining components
takes place in reverse order.
Changing the material needle
1. Unscrew the spring cap (item 13).
2. Remove the needle spring (item 12).
3. Pull the material needle (item 9) out of the gun body.
4. Loosen the counter screw (item 11) from the driving bushing (item 10) and
unscrew the material needle.
Assembly takes place in reverse order.
X
Note
The needle setting for the PILOT PREMIUM (FB) is X = 59.0 mm and for the
PILOT PREMIUM (FA) X = 67.5 mm from the needle tip to the driving bushing.
Replacing a leaking needle packing
1. Remove the material needle as outlined above.
2. Unscrew the packing screw (item 8) from the gun body.
3. Unscrew the lever shank screw (item 32) and the lever screw (item 30) and
remove the trigger (item 31).
3. Remove the needle seal (item 7). You may need to use a thin wire with the end
bent to a hook.
Assembly takes place in reverse order.
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