Replacement Of The Spray Gun Components; Replacement Of The Material Nozzle And The Air Cap; Replacement Of The Needle; Replacement Of Needle Seal Packing - WALTHER PILOT III F Mode D'emploi

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Replacement of the Spray Gun Components

If a jet contour other than those already described is desired, the spray gun
has to be re-tooled. Air control head, material control nozzle and needle packing tog-
ether form a unit - the nozzle insert assembly. Always change the complete insert
assembly to maintain the desired spray finish quality.
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
In order to perform the following procedures, please refer to the exploded diagram at
the beginning of these operating instructions.
8.1

Replacement of the material nozzle and the air cap

1. Unscrew the retaining nut (N° 2).
2. Remove the air cap (N° 3).
3. Unscrew the nozzle (N° 4) from the gun body.
Reassemble in reverse order.
8.2

Replacement of the needle

1. Unscrew the spring retaining bush (N° 14).
2. Take off the needle spring (N° 13).
3. Pull the needle (N° 10) out of the gun body.
Reassemble in reverse order. For correct initial air adjustment the needle has to be
set at 76,5 mm measured from the tip to the driving sleeve (N° 11).
8.3 Replacement of the needle seal packing
1. Disassemble the needle as described 8.2.
2. Remove the needle packing gland (N° 23).
3. Remove the needle packing (N° 24).
Reassemble in reverse order.
Note
Never reinstall a used needle seal packing, as otherwise the functional sealing relia-
bility of the spray gun will not be guaranteed.
Note
All sliding and moveable parts (except the material needle!) must be lubricated with a
non-acidic, non-resinogenic grease prior to installation.
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Cleaning

The gun does not need to be dismantled for cleaning. Clean the Teflon®-coated
gun body with a soft cloth.
1. Fill the cleaned material container / gravity-feed cup / syphon-feed cup or the
cleaned pressure tank with a cleaning fluid compatible with the sprayed materi-
al.
2. Operate the spray gun.
3. Do not stop the spray gun until clear cleaning fluid emerges from the nozzle.
The entire system should then be depressurised until the gun is used again.
Clean the spray gun only with cleaning agents which have been recommended by
the manufacturer of the sprayed material and which do not contain the following
constituents:
• halogenated hydrocarbons
(e.g. 1,1,1-trichloroethane, methylene chloride, etc.)
• acids and acidic cleaning fluids
• regenerated solvents (so-called cleaning thinners)
• paint removers
The above-mentioned constituents cause chemical reactions on electroplated
components, resulting in corrosion damage.
Clean the spray gun
• before each change of spraying material
• at least once a week or
• several times a week if required by the spraying medium and depending on the
degree of fouling.
Complete Cleaning
1. Disassemble the spray gun.
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:
• needle spring
• all sliding parts and bearing points.
The moving internal parts must be greased at least once a week.
The springs should always be coated with a thin layer of grease. For this, always
use a non-acidic, non-resinogenic grease and a soft brush.
Assemble the gun again in reverse order.
Caution
Do not use any hard, sharp or pointed objects when cleaning the spray gun.
WALTHER is not responsible for any damage resulting from improper cleaning.
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