29
28
7.2
Cleaning - Complete
Regular cleaning and lubrication of the spray gun has to be performed, in order to
increase the service life and the function of the spray gun.
Clean the gun only with cleaning solutions recommended by the manufacturer of the
spraying material used at the time. It is important to make sure that cleaning soluti-
ons 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 the electroplated components
resulting in corrosion damage.
WALTHER Spritz- und Lackiersysteme GmbH is not responsible for any damages
resulting from such 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 resultant
degree of fouling.
Caution
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.
Caution
Do not use any hard, pointed or sharp-edged objects when cleaning the spray gun.
Any damage of the precision-made parts are likely to affect your spraying results.
1. Dismantle the spray gun in accordance with 6.2/
6.3 Replacement of Material
Control Nozzle and Needle.
2. Use a soft brush together with a compatible cleaning sulotion to clean the air
control head and nozzle.
3. Clean the remaining parts and the spray gun body with a suitable cloth and
cleaning solution.
4. Apply a thin film of the appropriate grease to the:
•
sealing collar of the piston
•
O-ring of the piston
•
needle spring
Make sure to use a non-acidic, non-resinogenic grease and a soft brush. The spray
gun is then reassembled in reverse order.
7.3
Cleaning - Routine
The spray gun need not necessarily be dismantled for cleaning if and when the
spraying medium is changed in regular intervals or upon termination of work (depen-
ding on the material used).
6.2
Replacing
the material nozzle
1. First remove the air cap.
2. Now remove the material nozzle (item 2) (size 7) from the front body.
6.3
Replacing
the material needle and membrane
1. Loosen the screws (item 35) and remove the adapter assembly (item 28) from
the spray gun.
2. Unscrew the regulating cap (item 27) and remove the needle spring (item 26).
3. Unscrew the threaded ring (item 25) and remove the piston spring (item 24).
4. Hold the driving tenon (item 22) with an open-ended spanner (size 5.5 mm),
loosen and remove the nut (item 23) with an open-ended spanner (size 5.5 mm)
and pull out the driving tenon (item 22) toward the back without turning it. Re-
move the needle spring (Pos. 21) and the needle spring collar (Pos. 20).
5. Loosen the screws (item 3) and pull the piston casing (item 15) from the front
body (item 4).
6. Loosen the clamping bush (item 12).
7. The needle assembly (items 6 to 12) can now be replaced.
8. Unscrew the rear part of the needle (item 10), remove the clamping bush
(item 12), the backing disc (item 11), the pressure ring (item 9) and then the
membrane (item 8). Replace the membrane. Pay attention during installation of
the membrane that the white PTFE coating points to the material side (forward).
9.
Screw the rear part of the needle onto the needle assembly. Ensure a firm seat
of the membrane between the two pressure rings (items 7 and 9)
10. Before the new needle is installed the needle centring tool (item 30) must be
screwed into the front part (item 4).
11. Insert the needle assembly (items 6 to 12) into the front part (item 4).
12. Tighten the clamping bush (item 12) in the front part with a torque of 11 Nm. Now
unscrew the needle centring tool again.
13. The assembly of the remaining components takes place in reverse order.
14. Make sure when mounting the piston casing (item 15) on the front part (item 4)
that the O-rings (item 5) will not be lost.
15. Screw down the regulating cap (item 27), which is screwed on last, far enough
until the edge of the cap rests between the two marking rings on the piston
casing (item 15). This ensures adequate pressure on the needle.
7 Cleaning
7.1
Safety Warnings
•
Prior to any servicing and repair work: 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.
•
No open fires, naked light and smoking allowed in the work area. When spraying
readily flammable media such as cleaning solutions, there is an increased risk
of fire and explosion.
•
Observe the safety warnings issued by the manufacturer. Aggressive and
corrosive media represent risks and hazards to personal health.
