Retooling Of Spray Gun; Cleaning Safety Warnings; Cleaning - Complete - WALTHER PILOT PILOT WA 400 Instructions De Service

compressor system. Please comply with the operating instructions and safety
warnings issued by the manufacturer.
If you wish to change the spraying pattern beyond the adjustments outlined so far,
you must retool the spray gun. (See 5.5 Retooling of Spray Gun).
WALTHER offers a great variety of air control head/ -material control nozzle/needle
combinations for this purpose.
Correcting of Spray Pattern Imperfections
The following table shows what to do to correct a spray pattern.
Spray pattern test Fault
Swollen centre
Swollen ends
Coarse pearl effect
Unduly thin paint layer in centre
Split centre
Spray pattern is very spherical
5.5

Retooling of Spray Gun

Combinations of air control head, material control 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 complete 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.
Notice
In order to perform the following procedures please use the drawing (page 2) of
these operating instructions.
Replacement of Air Control Head
1. Unscrew the knurled air control head retaining ring (pos. 1) from the casing
(pos. 6).
2. Pull the air control head (pos. 2) of the casing.
3. Position the required air control head on the casing.
4. Screw the air control head retaining ring in the casing.
desireable spray-painting result
Necessary adjustment
• Spray jet should be flatter
• Spray jet should be rounder
• Increase atomising air pressure
• Decrease atomising air pressure
• Increase nozzle diameter
• Reduce atomising air pressure
• Increase material pressure
• Decrease material pressure
• Increase atomising air pressure
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Replacement of Material Control Nozzle and Needle
1. Remove the air control head (see 5.5 Replacement of Air Control Head)
2. Unscrew the material nozzle (pos. 3) from the casing. Remove the sealing
washer (pos. 4) and the air distribution ring (pos. 5).
3. Unscrew the drawbar (pos. 33).
4. Unscrew the cap (pos. 32) from the casing.
5. Pull off the material control needle (pos. 25-29) from the casing.
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
corrosive 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 components
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.
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