Changing The Spray Pattern; Changing The Air Cap - WALTHER PILOT PILOT WA 600 Betriebsanleitung

4.3

Changing the Spray Pattern

• Round-fan or wide-fan air caps are available.
• The fan width can be varied by changing the atomising air.
• The material flow rate is determined by the material pressure and the diameter
of the material nozzle.
4.4 Correction of Spray Pattern Imperfections
The following table shows how to correct a defective spray pattern.
Desired Spray Pattern
Spray pattern Fault
test
Swollen centre
Swollen ends
Coarse pearl effect
Unduly thin paint layer in
centre
Split centre
Very spherical
5 Re-tooling the Spray Gun
The combination of air cap, material nozzle and needle for a certain spraying materi-
al forms a specially matched unit - the nozzle assembly.
Always exchange the complete nozzle assembly in order to maintain the desired
spray pattern quality.
Warning
Air and material inputs must be shut off prior to re-tooling - risk of injury.
Note
Please refer to the exploded view at the beginning of this manual to perform the steps
detailed below.
Necessary adjustment
• Spray jet should be flatter
• Spray jet should be rounder
• Increase atomising air pressure
• Decrease atomising air pressu-
re
• Increase nozzle diameter
• Reduce atomising air pressure
• Increase material pressure
• Decrease material pressure
• Increase atomising air pressure
26
5.1

Changing the Air Cap

1. Unscrew the air cap nut.
2. Remove the air cap (Pos.1).
5.2 Changing the Material Nozzle
1. Unscrew the air cap nut.
2. Remove the air cap.
3. Unscrew the material nozzle (Pos.2) from the spray gun head.
Installation takes place in reverse order.
5.3 Changing the Material Needle
1. Unscrew the threaded rod (Pos. 22).
2. Unscrew the air cap (Pos. 21).
3. Remove the needle spring (Pos 20).
4. Unscrew the threaded ring (Pos. 19).
5. Withdraw the piston (Pos. 11) together with the material needle (Pos. 17).
6. Unscrew the material needle from the piston.
7. The distance between the tip of the material needle and the piston should be
set at 79,0 mm.
Installation takes place in reverse order.
5.4 Changing the Needle Seal
1. Unscrew the front part from the piston casing.
2. Remove the seal.
3. Remove the complete needle packing using a strong wire with a hook at its
end.
4. Lubricate the new needle seal packing..
Installation takes place in reverse order.
27