WALTHER PILOT PILOT WA 400, Operating Instructions Manual

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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 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

• 

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 

spraying medium is changed in regular intervals or upon termination of work (depen-

ding on the material used).

Notice

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.  Do not stop the spray gun until clear cleaning solution emerges from the nozzle.

The material supply of the PILOT WA 400 - WA 430 and WA 470-K - WA 473-K can 

be manually released so that it is not necessary to operate the complete spraying 

system.

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.

Notice

Please use the drawing (page 2) of these operating instructions to perform the        

following procedures. 

7.1 

Replacement of defective Needle Seal Packings

1.  Remove all pressures from the gun.

2.  Unscrew the drawbar (pos. 33).

3.  Unscrew the adjuster cap (pos. 32) from the casing (pos. 6).

4.  Remove the threaded ring (pos. 31) from the casing.

5.  Remove the piston spring. 

6.  Pull out the piston plus the material needle (pos. 25-29) from the casing.

7.  Unscrew the packing screw (pos. 21).

8.  Remove the packing spring (pos. 20) and the pressure ring (pos. 19).

9.  Pull out the needle packing (pos. 18) with an auxilliary tool. Use a strong wire 

on which one end is bent making a small hook.

10.  Lubricate the new needle seal packing with non-acidic, non-resinogenic grease.

11.  Install the new needle seal packing into the casing.

Installation of the remaining parts in reverse order.

Notice

Never reinstall a used needle seal packing (pos. 18) 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 Replacement of Material 

Control Nozzle and Needle

, if the following components have to be replaced:

• 

Material Control Nozzle

• 

Piston Spring

• 

Material Control Needle*

• 

Needle Spring*

• 

Piston Sealing Collar*

• 

Piston O-Ring*

Notice

Parts marked with * must be lubricated with non-acidic, non-resinogenic grease prior 

to installation.

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.