Retooling The Spray Gun; Changing The Air Cap; Changing The Material Nozzle; Changing The Material Needle - WALTHER PILOT PILOT WA 625 Betriebsanleitung

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Retooling the Spray Gun

The combination of air cap, material nozzle and needle for a certain spraying material
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.
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.
4. 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.
8. 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..
5. Installation takes place in reverse order.
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6

Troubleshooting

Warning
Prior to any servicing and repair work the spray gun should be inunpressurised
state, i.e. all control air and atomising air pressure as well as all material inputs
must be shut off - risk of injury.
Spray pattern Fault
Gun drips Material needle or nozzle
dirty
Material needle or nozzle
damaged
Gun does not open Control air pressure too low Increase control air pressu-
Irregular or splattering Insufficient material in con-
spray tainer
Gun sprays when swit- O-ring Item 7 damaged
ched off
Material bubbling in Atomising air is entering the
material container material container via the
material channel. Material
nozzle or air cap not proper-
ly tightened
Spray fan one-sided Air cap horn bore dirty
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Cleaning and maintenance

• To ensure that the spray gun functions properly and to maximise its service life,
the spray gun must be maintained, cleaned and lubricated regularly.
• Before carrying out any maintenance, ensure that the control air and atomising
air as well as the material feed are depressurised.
• Cleaning should be carried out after every colour and material change or accor-
ding to the degree of contamination.
• For cleaning the spray gun, use only those cleaning agents that are specified by
the material manufacturer and ensure that they do not contain any of the follo-
wing components:
- halogenated hydrocarbons,( e.g. 1,1,1-trichloroethane, methylene chloride,etc.)
- acids or acidic cleaning agents,
- paint strippers,
- regenerated solvents (cleaning thinners).
• Never immerse the whole spray gun in solvent or cleaning agent, as this could
harm the correct functioning of the gun.
Adjustment
Remove and clean
Replace
re to min. 4.5 bar
Fill up with material (see
instructions from material
manufacturer)
Replace
Clean the parts, tighten or
replace
Remove and clean
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