29
28
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.
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.
Caution
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.
Caution
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
7 Repairs
.
2. Clean the air cap and the material nozzle with a soft brush and cleaning fluid.
3. Clean all other components and the gun body with a soft cloth and cleaning fluid.
4. Coat the following parts with a thin layer of grease:
•
Spring of the flute-piston
•
O-ring of the piston
•
Flute-piston
•
Material needle
•
Piston spring
•
Piston
Use non-acidic, non-resinogenic grease and a brush. The spray gun is then reas-
sembled in reverse order.
6.2
Cleaning Process
The model PILOT WA 55 is automatic cleaned after each spraying process when it
is in use.
1. The last process step before stopping requirement should be always the
cleaning process.
2. Do not stop the spray gun until clear cleaning solution emerges from the nozzle.
All pressures should then be removed from the complete spraying system until the
next operation.
Note
Clean and lubricate the spray gun frequently in accordance with Chapter
6.1
Cleaning - Complete
. This will ensure functional reliability of the spray gun.
7
Repairs / Replacements
Warning
Prior to any repairs / replacements: 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
Please use the drawing at the beginning of these operating instructions to perform
the following procedures.
7.1
Replacement of Air Cap and Material Nozzle
1. Unscew the sleeve nut (item 1) and remove the air cap (item 2).
2. Unscrew the material nozzle (item 3) from the housing (item 7).
Installation takes place in reverse order.
7.2
Replacement of Material Needle
1. Remove all hoses from the connections of the housing (item 7).
2. Unscrew both cap screws (item 14) from the housing and pull back the spring
bushing (item 13).
3. Remove the piston spring (item 12) and pull out the piston (item 10) with mate-
rial needle (item 6).
4. Loose the nut (item 11) and unscrew the material needle from the piston.
5. Brush the thread of the new material needle with adhesive (to seal) and screw
the needle in the piston.
6. Screw the nut to counter at the material needle.
The setting dimension of the
material from needle tip to the piston is 46,8 mm.
Installation takes place in reverse order.
7.3
Replacement of Needle Seal
1. Remove the air cap, the material nozzle and material needle as described under
7.1 and 7.2.
2. Unscrew the packing screw (item 4) from the housing.
3. Pull out the needle seal (item 5) with an auxilliary tool. Use a strong wire on
which one end is bent making a small hook.
Installation takes place in reverse order.
Note
Never reinstall a used needle seal (item 5) as otherwise the functional sealing relia-
bility of the spray gun will suffer.