Replacement Of The Material Needle; Troubleshooting - WALTHER PILOT Mini Mode D'emploi

Replacement of the Material Needle:

1. Remove the needle adjusting screw (item 15).
2. Remove the needle spring (item 14).
3. Remove the material needle (item 13) from the gun body.
Install the new material needle in reverse order.
Note
The needle setting for the PILOT Mini (FB) is X = 103,5 mm and for the PILOT Mini
(FA) X = 121,5 mm from the needle tip to the driving bushing.
Replacement of leaking Needle Seal Packing
1. Remove the material needle, nozzle and air cap.
2. Use a screwdriver to remove the needle packing gland (item 3.1) from the gun
body (It is recommended to use special tool instead of the screwdriver).
3. Remove the needle seal packing complete (item 3) {needle packing gland
(item 3.1), needle seal packing (item 3.2), thrust ring (item 3.3)} from the gun
body. Use a thin wire, one end of which is bent into a hook, for this purpose.
Installation of the new needle seal packing in reverse order.
Note
Needle seal packings removed from the gun are not to be used again because their
sealing efficiency can no longer be relied upon.
Note
Apply a thin layer of grease when reinstalling or exchanging the following parts.
7 Cleaning
Attention
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.
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.
The gun does not need to be dismantled for cleaning.
1. Fill the cleaned material container / gravity-feed cup / syphon-feed cup / suspen-
ded pressure-feed cup or the cleaned pressure tank with a cleaning fluid
compatible with the sprayed material.
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.)
x
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• 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.
8

Troubleshooting

Warning
Prior to any repairs/replacements: Make sure that the spray gun is in unpressurized
condition, i.e. the air and material input must be shut off - if not, imminent Risk of
Injury.
Fault Cause
Nozzle or needle damaged
Nozzle or needle clogged
Gun is dripping
Needle packing gland (item 3.1)
too tight
Level in material tank too low
Pulsating or Gravity cup is tilted too much
unsteady spray jet
Material nozzle (item 2) loose or
damaged
Gun keeps blowing Valve spring (item 8) or
in off-position valve cone (item 7) damaged
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Remedy
Replace
Clean
Loosen slightly
Top-up
Keep straight
Tighten or replace
Replace