7
Repairs / Replacements
Warning
Prior to any repairs / replacements: Make sure that the spray gun is in unpressuri-
zed 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 defective Needle Packing
1. Unscrew the front body pos. 6 and the piston casing pos. 14 by loosing the two
cylinder head screw pos. 7 from the adaptor plate pos. 26.
2. 1. Unscrew the draw bar pos. 24.
3. Unscrew the cap pos. 23 from piston casing pos. 14.
4. Pull the material needle pos. 21 out of the piston casing.
5. Unscrew the front body by loosing the four socket screw pos. 5 from the piston
casing.
6. Unscrew the packing screw pos. 10.
7. Pull out the needle packing (needle seal pos. 8 and lip seal pos. 9) with an auxil-
liary tool. Use a strong wire on which one end is bent making a small hook.
8. Lubricate the new needle packing with non-acidic, non-resinogenic greaseand
install the new needle packing in the front body.
Installation of the remaining parts is performed in reverse order.
Note
Never reinstall a used needle packing (pos. 8+9) as otherwise the functional sea-
ling reliability of the spray gun will suffer.
7.2
Replacement of Nozzles, Needles, Springs and Seals
Dismantle the spray gun in accordance with Chapter
5.5 ReTooling the Spray Gun
,
if the following components have to be replaced:
• Material Nozzle
• Pressure of the Piston
• Material Needle*
• Needle Spring*
• Friction ring-gasket
*
• O-Ring of the Piston*
Note
Parts marked with * must be lubricated with non-acidic, non-resinogenic grease
prior to installation.
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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
5.5 Retooling the Spray Gun.
2. Use a soft brush together with a compatible cleaning sulotion to clean the air cap
and nozzle.
3. Clean the remaining parts and the spray gun body with a suitable cloth and clea-
ning solution.
4. Apply a thin film of the appropriate grease to the:
• sealing collar of the piston
• O-ring of the piston
• material control needle
• needle spring
Make sure to use a non-acidic, non-resinogenic grease and a soft brush.
6.3
Cleaning - Routine
The spray gun need not necessarily be dismantled for cleaning if and when the spray-
ing medium is changed in regular intervals or upon termination of work (depending on
the material used).
Note
Clean and lubricate the spray gun frequently in accordance with Chapter
6.2 Cleaning
- Complete
. This will ensure functional reliability of the spray gun.
The following requirements must be met before the routine cleaning work can be per-
formed:
1. The material tank must be claen and then be filled with a compatible cleaning aolu-
tion. Material pressure has to be available at the spray gun.
The cleaning solution should not be sprayed.
2. Take the spray gun into operation (see
5.2 Starting the Spray Gun
).
3. Do not stop the spray gun until clear cleaning solution emerges from the nozzle.
The material supply of the PILOT WA 800 - WA 873 can be manually released so that
it is not necessary to operate the complete spraying system.
1. Pull back the draw bar of the spray gun. The material inlet is
now open and both material duct and material nozzle will be
cleaned.
2. Do not let go of the drawbar until clear cleaning solution
emerges from the nozzle.
All pressures should then be removed from the complete spraying system until the
next operation.
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