Graco 311322H, Operation, Parts, Service And Repair

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Repair
311322H 19
End Cap O-ring and Safety
Stop Seal
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.
3. Remove socket head screw and clamp
from rear of air cylinder.
4. See F
IG
. 13. Use a retaining ring pliers to
remove retaining ring. Ring retains end cap
position in air cylinder.
5. Pull safety stop until it and attached end
cap come free from air cylinder. Be sure to
retain piston spring, which is located inside
cylinder.
6. Inspect end cap o-ring and replace if dam-
aged. Lightly coat new o-ring with
Lubriplate grease and install on end cap.
To repair side blocks, see Side Blocks ,
page 13.
Removing safety stop and end cap
requires some force because o-ring is
tightly compressed.
F
IG
. 13. End Cap Assembly
End Cap/Safety
Stop Assembly
Retaining Ring
Cylinder Clamp
Socket Head
Cap Screw