Cleaning - Routine; Repairs / Replacements; Replacement Of Nozzles, Needles, Springs And Seals - Walther PILOT WA 900 Instructions De Service

6.3

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).
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
performed:
1. The material tank must be clean and then be filled with a compatible cleaning
solution. 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. Only take the spray gun out of service after it merely sprays clear cleaning
agent.
The material supply of the series PILOT WA 900 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 soluti-
on emerges from the nozzle.
All pressures should then be removed from the complete spraying system until the
next operation.
7

Repairs / Replacements

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
Please use the drawing at the beginning of these operating instructions to perform
the following procedures.
7.1 Replacement of defective Needle Packing
1. Remove all pressures from the gun.
2. Unscrew the front body section (Pos. 7) and the piston casing (Pos. 19) from the
adapter plate by loosening two cylinder head screws (Pos. 31).
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3. Unscrew the drawbar (Pos. 27) from the gun.
4. Unscrew the cap (Pos. 26) from the piston casing.
5. Screw the drawbar into the material needle (Pos. 21) and pull the material need-
le out of the piston casing.
6. Unscrew the front body section from the piston casing (Pos. 19) by loosening
four socket head cap screws (Pos. 5).
7. Unscrew the packing screw (Pos. 12).
8. Remove the packing spring (Pos. 11) (replace if damaged) and the washer
(Pos. 10) from the screw hole.
9. Pull out the needle seal packing (Item 9) with an auxilliary tool. Use a strong wire
on which one end is bent making a small hook.
10. Grease the new needle packing with WALTHER PILOT spray gun grease and
insert it into the front body section.
Installation of the remaining parts is performed in reverse order.
Note
Never reinstall a used needle seal packing (Item 9) as otherwise the functional
sealing 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 Repalcement of Material
Control Nozzle and Needle, if the following components have to be replaced:
• Material Nozzle
• Pressure of the Piston
• Material Needle*
• Needle Spring*
• Flat mechanical seal of the Piston*
• O-Ring of the Piston*
Note
Components marked * must be greased with WALTHER PILOT spray gun grease
before installation in the gun body.
WALTHER Spritz- und Lackiersysteme repair kits are available for PILOT WA 900
series spray guns including all wearing parts:
Parts No.: V 16 209 00 . . 3 (WA 900 / WA 905)
Parts No.: V 16 209 20 . . 3 (WA 920 / WA 925)
Parts No.: V 16 209 40 . . 3 (WA 940 / WA 945)
Parts No.: V 16 219 03 . . 3 (WA 903 / WA 908)
Parts No.: V 16 219 23 . . 3 (WA 923 / WA 928)
Wearing parts are also shown in the listing of replacement parts (in bold face).
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