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18 311322K
8. Pull safety stop until it and attached end
cap come free from air cylinder. Be sure to
retain piston spring, located inside cylinder.
9. Inspect end cap o-ring and remove if dam-
aged. Lightly coat new o-ring with Lubri-
plate grease and install on end cap.
10.Pull piston assembly out of air cylinder.
11.See F
IG. 12. Remove retaining ring and
slide piston shaft out from the back of pis-
ton.
12.Inspect shaft and piston o-rings and
replace if damaged. Lightly coat new
o-rings with Lubriplate grease before
installing.
13.Slide piston shaft into the back of piston,
being careful not to damage shaft o-rings.
Secure with retaining ring.
14.Install piston assembly into the air cylinder.
See FIG. 11.
15.Center piston spring over raised portion of
piston. Align raised portion of end cap with
inside diameter of piston spring. Insert end
cap into air cylinder. Press end cap until it
moves past the undercut groove in air cylin-
der, which is where retaining ring nests.
Maintain pressure on end cap, ensure
groove remains visible, and install retaining
ring using retaining ring pliers.
16.Reinstall socket head screw and cylinder
clamp in rear of air cylinder.
17.Hold end of piston shaft with a 3/16 in.
wrench or needle-nose pliers. Screw the
mixing chamber onto shaft by hand.
18.Slide gun block over mixing chamber and
up to gun. Install two mounting screws.
Tighten screws alternately and evenly to
prevent leakage.
19.Install side blocks to gun body with two
mounting screws. Tighten screws alter-
nately and evenly to prevent leakage.
20.Return gun to service. See Daily Start-Up,
page 11.
Removing safety stop and end cap
requires some force because o-ring is
tightly compressed.
FIG. 12. Piston Assembly
Piston Shaft
Piston Shaft
O-Rings
Piston
Piston O-Ring
Retaining Ring
Be sure to insert retaining ring completely into
groove so end cap will remain in air cylinder
when gun is pressurized. Keep clear of end
cap when reapplying air pressure or trigger-
ing gun after reassembly in case of improper
retaining ring installation