Replace Trigger Valve O-Rings - Graco GX-8 Operation, Parts, Service, Repair
For use with non-flammable polyurethane foams, two-component coating systems
(polyureas), and some two-component epoxy systems. for professional use only.
not for use in explosive atmospheres.
3500 psi (24 mpa, 240 bar) maximum working pressure
125 psi (9
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Also See for GX-8:
- Operation, parts, service, repair (40 pages) ,
- Instructions-parts list manual (6 pages)
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Repair
Retaining ring must seat completely into groove to
secure end cap in place when air cylinder is pressur-
ized. Keep clear of cap when air pressure is applied or
gun is triggered after reassembly.
17. Use 9/64 in. ball-point hex key to install and tighten
socket head cap screw, which holds air cylinder to
handle.
18. Reinstall valving rod and jam nut:
a. Thread jam nut as far as it will go onto threaded
end of piston shaft.
b. Ensure hex end of nut faces rear.
c. Thread valving rod as far onto threaded portion
of piston rod as possible.
19. Thread packing nut into gun block by hand but do
not tighten.
20. Install gun block:
a. Ensure ring is in place in top of gun block.
b. Carefully slide gun block onto valving rod
toward air cylinder.
c. Use 5/16 in. nut driver to install gun block onto
gun block mounting bracket.
21. Adjust valving rod (see Valving Rod Adjustment
on page 14).
Replace Trigger Valve
O-Rings
1. Clean gun (see Clean Spray Gun Procedure, page
19).
2. Perform Pressure Relief Procedure, page 17.
24
3.
Disconnect air supply from gun.
Refer to Parts, page 27.
Spring
Seat
Valve
Liner
O-rings
Valve
Spring
Valve
Spool
Valve Retainer Nut
F
. 18: Replace Trigger Valve O-Ring
IG
4. Use 6 in. adjustable wrench and 6 in. pliers to
remove screw and locknut that hold trigger lever in
place. Remove trigger lever.
5. Use 3/8 in. wrench to loosen and remove valve
retainer nut.
6. Remove valve spool and spring:
a. Grab end of spool and pull out. Spring will come
out with spool. Do not lose spring--it belongs in
hole at end of spool.
b. Remove old rings.
c. Apply thin coat of Lubriplate grease to new rings
and reinstall.
NOTE: Follow steps 7-14 to replace rings on valve liner.
If rings do not need to be replaced, proceed to step 15.
7. Use 3/16 in. hex key to remove 1/8 in. rear internal
plug. This plug seals another airflow path in gun
handle.
NOTE: For guns configured with air inlet at rear of gun
handle, pipe nipple replaces pipe plug. Remove pipe
nipple.
8. Use 5/32 in. hex key to remove rear internal pipe
plug (under pipe plug).
1/16 in. Pipe
Plug
1/8 in.
Pipe Plug
Optional 1/8 in.
Pipe Nipple
Trigger Mounting
Screw
Trigger Lever
311338N
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