Remove Centerline Components; Install Centerline Components - Graco GX-8 Operation, Parts, Service, Repair

Remove Centerline
Components
Refer to page 5 for diagrams of centerline
components for all gun models.
1. Flush gun (see Clean Spray Gun Proce-
dure, page 15).
2. Remove air cap (loosen by hand).
3. Use 10 in. adjustable wrench to remove
PCD.
4. Connect air supply to gun.
5. Lift PCD off nose of gun block and remove.
To remove PCD that is stuck, set safety
stop to OPEN, depress and release gun
trigger to unseat it. CLOSE safety stop.
6. Remove mixing module retainer.
7. OPEN safety stop. Depress and release
gun trigger to unseat it. Remove mixing
module off end of valving rod. CLOSE
safety stop.
CAUTION
Do not use sharp objects or metal tools to
remove mixing module.
8. Disconnect air supply from gun.
9. Use 5/16 in. wrench to loosen packing nut
3 or 4 turns.
10. Remove gun block:
a. Use 5/16 in. nut driver to remove gun
block retaining screw.
b. Slide gun block away from valving rod
and air cylinder. If dried chemical is built
18
up on gun block, remove dried chemi-
cals to make removal easier.
11. Remove and clean check valves (see
Remove Check Valve, page 17).
12. Remove valving rod:
a. Use 3/8 in. wrench on hex-shaped valv-
ing rod shank and a 1/2 in. wrench on
jam nut to loosen it and back it away
from valving rod shank by 3 or 4 full
turns.
b. Unthread valving rod from piston shaft
and remove.
13. Clean all components thoroughly before
reassembly.
14. Inspect gun block to ensure proper opera-
tion of spray gun.
Install Centerline
Components
Before installation, ensure all gun components
are clean and dry. Lubricate all moving parts
and threads.
1. To install valving rod, thread jam nut as far
back on piston shaft as possible. Screw
shank end of valving rod onto threaded end
of piston rod.
2. Install rear seal and packing nut if removed.
Thread packing nut into gun block by hand,
but do not tighten.
3. To install gun block, carefully slide gun
block onto valving rod towards air cylinder.
Use 5/16 in. nut driver to install gun block
onto gun block mounting bracket.
4. Connect air supply to gun.
Repair
311338B