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5.5
Retooling of Spray Gun
Combinations of air cap, material nozzle and needle, designed to match specific
spraying media tpyes and grades, form a unit - namely the nozzle insert assembly.
In order maintain the desired spray-finish quality standard always replace the com-
plete nozzle insert assembly.
Warning
Prior to retooling: Make sure that the spray gun is in unpressurized condition, i.e. all
air and material inputs must be shut off - if not, imminent risk of injury.
Note
In order to perform the following procedures please use the drawing at the beginning
of these operating instructions.
Replacement of Air Cap
1. Unscrew the knurled air cap retaining ring in (Item 1) from the front body (Item 7).
2. Pull the air cap (Item 2) of the front body.
3. Position the required air cap on the front.
4. Screw the air cap retaining ring in (Item 1) onto the front.
Replacement of Material Control Nozzle and Needle
1. Remove the air control head (item 2) (see
5.5 Replacement of Air Control Head
).
2. Unscrew the material nozzle in (Item 3) from the front (item 7) (width over flats of
hex. nut 13).
3. Pull out the pulling rod (item 26) together with the material needle (item 23).
4. Unscrew the cap in (Item 25) from the threaded ring in (Item 22).
5. Pull the material needle (item 23) out of the piston housing (item 18).
Installation of the new nozzle insert assembly and the remaining parts is performed
in the reverse order.
6
Cleaning
6.1
Safety Warnings
• Prior to any servicing and repair work: Make sure that the spray gun is in unpres-
surized condition, i.e. all air and material inputs must be shut off - if not, imminent
risk of injury.
• No open fires, naked light and smoking allowed in the work area. When spraying
readily flammable media such as cleaning solutions, there is an increased risk of
fire and explosion.
• Observe the safety warnings issued by the manufacturer. Aggressive and corrosi-
ve media represents risks and hazards to personal health.
6.2
Cleaning - Complete
Regular cleaning and lubrication of the spray gun has to be performed, in order to
increase the service life and the function of the spray gun.
Clean the gun only with cleaning solutions recommended by the manufacturer of
the spraying material used at the time. It is important to make sure that cleaning
solutions do not contain any of the following constituents:
• halogenated hydrocarbons
(e.g. 1,1,1-trichloroethane, methylene chloride, etc.)
• acids and acidiferous cleaning solutions
• regenerated solvents (so-called cleaning dilutions)
• paint removers.
The above constituents cause chemical reactions with the electroplated compon-
ents resulting in corrosion damage.
WALTHER Spritz- und Lackiersysteme is not responsible for any damages resulting
from such treatment.
Clean the spray gun
• prior to each change of the spraying medium.
• at least once a week.
• as often as may be required by the spraying medium handled and the resultant
degree of fouling.
Caution
Never immerse the spray gun in solvent or any other cleaning solution. The functio-
nal reliability and efficiency of the gun can otherwise not be guaranteed.
Caution
Do not use any hard, pointed or sharp-edged objects when cleaning the spray gun.
Any damage of the precision-made parts are likely to affect your spraying results.
1. Dismantle the spray gun in accordance with
5.5 Retooling the Spray Gun.
2. Use a soft brush together with a compatible cleaning sulotion to clean the air cap
and nozzle.
3. Clean the remaining parts and the spray gun body with a suitable cloth and
cleaning solution.
4. Apply a thin film of the appropriate grease to the:
• sealing collar of the piston
• O-ring of the piston
• material control needle
• needle spring
Make sure to use a non-acidic, non-resinogenic grease and a soft brush. The spray
gun is then reassembled in reverse order.
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