Clean Mixing Module - Graco GX-8 Operation, Parts, Service, Repair

9. Use pin punch and hammer to gently tap spring seat
until it and valve liner push out opposite end of hole.
10. Remove rings on liner. Apply thin coat of Lubriplate
grease to new rings and install.
11. Clean valve hole. Remove any dirt and debris.
Apply thin coat of Lubriplate grease to inside of
valve hole.
12. Slide spring seat into gun handle air valve hole,
tapered end first, until it bottoms out.
13. Push valve liner in as far as it will go. Install valve
retainer nut, it will align valve liner and spool to their
proper depth.
14. Use 5/32 in. hex key to screw 1/16 in. pipe plug
back into place. Apply think coat of pipe thread seal-
ant to threads prior to insertion to help prevent air
leaks.
15. Apply small amount of pipe thread sealant to 1/8 in.
plug threads. Screw pipe plug in place.
16. Insert valve spool into valve liner with valve spool
spring still in place. Screw in valve retainer nut;
tighten until snug.
17. Use screw and locknut to reinstall trigger lever.

Clean Mixing Module

1. Flush gun (see Clean Spray Gun Procedure, page
19).
2. Connect air supply to gun. OPEN safety stop.
3. Remove air cap by hand.
F . 19: Unthread Cap from PCD Body
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4. Trigger gun and hold it to relieve pressure on PCD
retainer.
311338N
5. Turn PCD retainer counterclockwise and remove.
6. Remove PCD from mixing module retainer.
NOTE: To remove PCD that is stuck, set safety stop to
OPEN, depress and release gun trigger to unseat it.
CLOSE safety stop.
7. Remove mixing module retainer.
8. OPEN safety stop. Depress and release gun trigger
to unseat it. Remove mixing module from end of
valving rod. CLOSE safety stop.
9. Inspect valving rod for damage and replace as
required. Use cloth soaked in gun cleaner or steel
wool to clean and remove buildup of mixed material
from rod.
NOTE: If valving rod is replaced, reset forward stop.
10. Clean mixing module.
NOTE: Ensure cleanout tool size matches module size
used.Insert cleanout tool into pin vise.
d.
Use cleanout tool to clean module ports. Make
sure not to insert tool too far, it will damage
inside bore of module. Use cotton swab soaked
in gun cleaner to clean bore of module.
F . 20: Clean Module Ports
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Repair
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