WALTHER PILOT PILOT WA 900, Operating Manual

22

23

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 
(depending on the material used). 

Note

Clean and lubricate the spray gun frequently in accordance to Chapter 6.2 

Cleaning 

- Complete

. This will ensure functional reliability of the spray gun. 

In order to perform routine cleaning, you must perform the following work steps:

1.

Thematerial  tank  must  be  clean  and  then  filled  with  a  compatible  cleaning

solution.  Only  the  material  pressure  has  to  be  present  at  the  spray  gun.  The

cleaning solution should not be sprayed.

2.

Put 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 series PILOT WA 900 can be manually released so that 

is it not necessary to operate the complete spraying system. 

The entire spray system should now be de-pressurized until the next use.

7 

Repairs / Replacements

Warn

i

ng

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 riskof injury..

Note

Please use the exploded view drawing at the beginning of this manualto perform the 

following procedures. 

7.1 

Replacement of defective Needle Seal Packing

1.

Remove all pressure from the gun.

2.

Unscrew  the  frontbody

 (P

art

. 7) 

and  the  piston  housing 

(P

art

. 19)

 by

unscrewing the two cylinder screws 

(P

art

. 38) 

of the adapter plate

.

3.

Unscrewthe tie rod

 (P

art

. 27) 

from the gun

.

4.

Unscrew the cap

 (

Part

. 26) 

from the piston housing

.

1.

Pull back the drawbar of the spray gun. The material

inlet  is  now  open  and  both  the  material  duct  and  the

material nozzle will be cleaned.

2.

Do not let go of the drawbar until clear cleaning

solution emerges from the nozzle.

5.

Screw  the  draw  bar  into  the  material  needle

 (P

art

. 21) 

and remove the

material needle fromthe piston housing

.

6.

Unscrew the front body by removing the four Allen head screws

 (P

art

. 5) 

from

the piston housing 

(P

art

. 19).

7.

Unscrew the packing screw

 (P

art

. 12).

8.

Remove (replace if damaged) the packing spring (Item 11) and washer (item

10) from the threaded opening.

9.

Pull out the Needle Seal Packing

  (

Item

  9) 

with an auxilary tool. Use a strong

wire on which one end is bent, making a small hook.

10.

Lubricate the new Needle Seal

Packing with 

WALTHER PILOT

 gun grease 

and

install it in the front body

.

The assembly of the remaining components is carried out in reverse order.

Note

Never re-use a used Needle Seal

Packing 

(

Part

. 9) 

as otherwise the 

functional sealing reliability of the spray gun is not guaranteed

.

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 spring of the piston

•

Material Needle*

•

Needle spring*

•

Piston Sealing Collar*

•

O-Ring of the Piston*

Note

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

prior to installation. 

WALTHER  Spritz-  und  Lackiersysteme 

repair kits are available for PILOT WA 

900 series spray guns including all wearing parts.

Pa

rt. Nr.: V 16 209 00 . . 3  (

Standard Version

)

Pa

rt. Nr.: V 16 209 20 . . 3  (

Low pressure Version HVLP

)

Pa

rt. Nr.: V 16 209 40 . . 3  (

Medium pressure Version

 HVLP

PLUS

)

The wear parts are also listed in the parts list (in bold).