30
31
Regulate the control air pressure
The control air pressure is to be adjusted at the air pressure reducing valve of the
compressor system. Please comply with the operating instructions and safety
warnings issued by the manufacturer.
5.5
Retooling 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
Before retooling the spray gun, always ensure that the air supply and material supply
to the spray gun have been interrupted.
Note
Please refer to the exploded view (page 4) of these operating instructions to perform
the steps detailed below.
Changing the Air Cap and the Material Nozzle
1. Unscrew the air cap nut (Item 1) and remove the air cap (Item 2).
2. Unscrew the material nozzle (Item 3) from the housing (Item 6).
Installation takes place in reverse order.
Changing the Material Needle
1. Remove all hoses from the connections.
2. Unscrew both hexagonal socket screws (Item 14) of the housing and pull the the
spring bushing (Item 13) backwards.
3. Remove the piston spring (Item 12) and withdraw the piston (Item 9) together
with the material needle (Item 8).
4. Loose the nut (Item 11) and unscrew the material needle from the piston.
5. Brush with adhesive (to seal) the thread of the material needle und screw it into
the piston.
6. Screw the nut to secure the material needle. The distance between the tip of the
material needle and the piston should be set at
41,5 mm.
Installation takes place in reverse order.
6
Cleaning and Maintenance
•
Make sure that the spray gun is in unpressurised condition, i.e. all air and mate-
rial inputs must be shut off - if not, imminent Risk of Injury.
•
Open fires, naked lights and smoking is prohibited in the working area. There is
an increasing risk of fire and explosion, when spraying readily flammable media
(such as cleaning solutions).
•
Observe all processing specifactions and safety warnings issued by the
manufacturer of cleaning media. Especially aggressive and corrosive media
represents risks and hazard to personal health.
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 resulted
degree of fouling.
Clean the gun only with cleaning solutions recommended by the manufacturer of the
spraying material, which 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 electroplated components
resulting in corrosion damage. WALTHER Spritz- und Lackiersysteme is not respon-
sible for damages resulting from this kind of treatment.
Attention
Never immerse the spray gun in solvent or any other cleaning solution as such
measure is very likely to affect the functional reliability and efficiency of the gun.
Do not use any hard, pointed or sharp-edged objects when cleaning the spray gun,
as the precision-made parts can be easily damaged and are likely to affect your
spraying results.
1. Dismantle the gun as described in section
5.5 Retooling the Spray Gun
.
2. Clean the air cap and nozzle with a brush dipped in the recommended cleaning
solution. Air cap and nozzle should always be cleaned properly to make sure
they fit well together. Material residue, which might impair the airflow, is thus
avoided.
3. Clean, if necessary, the material duct.
4. Clean the gun body and all remaining parts with a soft cloth and the recommen-
ded cleaning solution.
5. Apply a thin layer of grease to the following parts:
•
Piston spring
•
O-ring of the piston
•
Material needle.
Use non-acidic, non-resinogenic grease and a brush. The spray gun is then
reassembled in reverse order.
