Replace End Cap And Air Piston Assembly - 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
8. Install PCD retainer:
a. With gun trigger depressed, thread PCD
retainer in place by hand.
b. Use 10 in. adjustable wrench to carefully tighten
PCD retainer until it is snug enough to ensure
no leak will occur.
c.
Release gun trigger.
To avoid damage to module and gun block, do not
over-tighten mixing module retainer.
9. Install air cap and tighten by hand.
10. Adjust valving rod (see Valving Rod Adjustment,
page 14).
22
NOTICE
Replace End Cap and Air
Piston Assembly
End Cap/Safety
Stop Assembly
Retaining
Ring
Piston
Piston
Spring
F
. 16: End Cap and Air Piston Assembly
IG
1. Clean gun (see Clean Spray Gun Procedure on
page 19).
2. Disconnect air supply from gun.
3. Use 5/16 in. wrench to loosen packing nut 3 or 4
turns (remove nut completely if rear seal needs to
be replaced).
4. Remove gun block:
a. Use 5/16 in. nut driver to remove gun block
mounting screw.
b. Carefully slide gun block away from valving rod
and air cylinder. If dried chemical has built up on
gun block, remove dried chemical to make
removal easier.
c. Remove valving rod and jam nut (see Remove
Check Valve, page 20):
d. Use 3/8 in. wrench on hex-shaped valving rod
shank and 1/2 in. wrench on jam nut.
e. Loosen jam nut and back it away from valving
rod shank by 3 or 4 full turns.
f.
Unthread valving rod and jam nut from piston
shaft.
#8 Socket Head
End Cap
Cap Screw
O-Ring
Cylinder
Cup Seal
Piston
O-Ring
311338N
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