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7.2
Replacement of the material needle
1.
Unscrew the needle adjustment screw (Item 14) from the gun body.
2.
Withdraw the valve spring (Item 12) and the valve shaft (Item 8) with the inte-
grated needle.
3.
Use a screwdriver to remove the valve cap screw (Item 11), located at the end
of the valve.
4.
Remove the needle spring (Item 10) and the needle (Item 9).
5.
The setting dimension for the needle-controlled initial air input is 54 mm, measu-
red between the point of the material needle and the face of the 1st needle
retaining nut, with the 2nd nut serving as lock nut.
Reassemble in reverse order.
7.3
Replacement of the defective needle packing
1.
Remove the material needle, the material nozzle and the air cap as outlined
above.
2.
Unscrew the packing screw (Item 4) from the gun body by using a special screw-
driver.
3.
Remove the needle-seal packing (Item 5). (You may need to use a thin wire with
the end bent to a hook)
Reassemble in reverse order.
Warning
The needle pack taken from the gun attachment may not be reused since a reliably
functioning sealing effect is no longer ensured.
Note
All movable and sliding parts must be greased with WALTHER PILOT gun grease
before installation in the gun body.
8
Cleaning and service
Attention
Never immerse the spray gun in solvent or any other cleaning solution. The functional
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 Spritz- und
Lackiersysteme 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 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 man- ufac-
turer of the sprayed material and which do not contain the following constituents:
30
•
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 compo-
nents, 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.
Detailed 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
WALTHER PILOT gun grease and a soft brush. Assemble the gun again in reverse
order.
9
Trouble shooting
Warning
Prior to any retooling the spray gun should be depressurized state, i. e. atomising air
as well as the material pressure - risk of injury.
Fault
Cause
Material Needle (Item 9) or Nozzle
(Item 3) is fouled or damaged
Needle Spring (Item 10) defective,
Gun drips
i. e. damaged or broken
needle adjustment screw (Item 14)
turned too far backwards
Gun keeps blowing
l
Valve sea
(Item 7) leaks
in off condition
Valve shaft (Item 8) damaged
Spray Jet onesided
Air Cap (Item 1) is fouled
31
Remedy
Clean or replace
(see 7 Retooling ...)
Remove and replace
Turn in the needle adjustment
screw (Item 14) slightly with a
wrench 13
Replace
Replace
Remove and clean
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