Graco GX-8 Operation, Parts, Service, Repair page 21

O-ring
Spring
End Cap
Cup Seal
Stop Pin
F . 17: End Cap/Safety Stop Assembly
IG
14. Reassemble safety stop mechanism:
a. Insert stop pin into end cap hole.
b. Slide spring and knob onto stop pin.
c. Use 5/64 in. hex key to reinstall two set
screws into knob. Ensure knob is
secure.
15. Reinstall end cap/safety assembly and pis-
ton spring:
a. Insert piston spring and align over
raised center of piston.
b. Line up raised center of end cap with
spring and insert end cap into air cylin-
der.
c. Press end cap until it moves past retain-
ing ring groove in cylinder.
d. Maintain pressure on end cap. Ensure
groove remains visible.
16. Use retaining ring 45° pliers to reinstall
retaining ring into groove .
311338B
Knob
Set Screws
Retaining ring must seat completely into
groove to secure end cap in place when air
cylinder is pressurized. Keep clear of cap
when air pressure is applied or gun is trig-
gered 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 11).
Repair
21