End Cap And Air Piston - Graco 311322H Operation, Parts, Service And Repair

End Cap and Air Piston

1. Follow Pressure Relief Procedure, page
12.
2. Use a 5/16 in. nut driver to alternately
loosen side block mounting screws. Care-
fully separate side blocks from gun. Wipe
mating surfaces with a rag soaked in gun
cleaner.
To repair side blocks, see Side Blocks,
page 13.
3. Use a 5/16 in. nut driver to remove gun
block mounting screws. Slide gun block
away from gun. Wipe mating surfaces with
a rag soaked in gun cleaner. Be sure to
retain o-ring located between gun block
and mounting flange.
End Cap/Safety
Stop Assembly
F . 11. End Cap and Piston Assembly
IG
311322H
Piston Assembly
Piston Spring
Socket Head
Cap Screw
Retaining Ring
To repair gun block, see Mixing Chamber
and Gun Block, page 15.
4. See F . 11. Use a 3/16 in. wrench or nee-
IG
dle-nose pliers to hold end of piston shaft
while unscrewing mixing chamber by hand.
To repair mixing chamber, see Mixing
Chamber and Gun Block, page 15.
5. Disengage safety stop.
6. Use a 9/64 in. ball point hex key to remove
socket head screw and clamp from rear of
air cylinder.
7. Use a retaining ring pliers to remove retain-
ing ring. Ring retains end cap position in air
cylinder.
Cylinder
Clamp
Mixing Chamber
Repair
17