Graco Alpha Plus AA Instructions-Parts List Manual page 20

Reassembly
1. Install the gasket (7*) in the gun. Screw the fluid
tube connector (C) into the gun's fluid inlet. Torque
to 105–115 in-lb (12–13 NSm). See Fig. 23.
2. Place the new u-cup (22*) on the seal installation
tool (34*), with the u-cup lips facing the tool as
shown in Fig. 21. Push the u-cup into the back of
the gun until a definite snap is felt.
Fig. 21
3. Install the two o-rings (12a) on the packing car-
tridge on the needle shaft. Lightly lubricate the
o-rings. Also lubricate the needle shaft where the
packing slides.
4. Insert the fluid needle assembly (12) into the front
of the gun. Use the tool (12c) to push the packing
cartridge into the gun body until the cartridge
bottoms out. See Fig. 22.
12
12c
Fig. 22
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Service
1
U-cup lips face the tool
1
22*
34*
9232A
5. Lubricate the front end of the air valve assembly.
Slide the air valve assembly (23*) onto the back of
the fluid needle assembly (12) and push the air
valve assembly into the back of the gun as far as it
will go.
6. Use the needle wrench (41) on the flats of the
needle to prevent it from rotating while screwing
the needle extension (24) onto the fluid needle.
See Fig. 20. Use only finger pressure on the
tool to tighten. Do not overtighten!
7. Install the two springs (25, 26). Screw the spring
cap (27) into the back of the gun body (1). Torque
to 125–135 in-lb (14–15 NSm).
8. Install the trigger (19), pivot pin (21), and trigger
lock screw (20). Torque to 20–30 in-lb (2.3–3.3
NSm). Lubricate both sides of the pivot pin where
the trigger contacts the pin, and lubricate the boss
9234A
on both sides of the gun where the trigger contacts
the gun body.
NOTE: Always install a new seat gasket (12b) when-
ever you replace the seat assembly (13).
9. Install a new seat gasket (12b). Trigger the gun to
pull the needle back while you screw the seat
assembly (13) into the gun body (1), using the gun
tool (36). Refer to Fig. 23 for recommended torque
values. When properly tightened, the flange will
bottom out on the gun.
10. Install the o-ring (17*) and screw the air separator
(16) onto the front of the gun body (1).
11. Install the spray tip (33) and air cap (14), then
secure with the tip guard assembly (18).