Fluid Packing Adjustment; Fluid Needle Removal - Graco PRO AA4500 Instructions Manual

Fluid Packing Adjustment

If fluid leaks from the fluid needle area, the fluid pack-
ings may be loose. Tighten the packings, following the
procedure below.
1. Remove the retaining nut (8), tip guard, (2), air cap
(1), and spray tip (9). See Fig. 7, page 28. You
may have to turn the air cap with the tip guard to
remove the air cap from the gun.
2. Trigger the gun and remove the seat housing (21)
with the 9 mm driver (64), supplied. See Fig. 8,
page 28.
NOTE: The seat housing (21) must be removed before
adjusting the fluid packings.
3. Remove the barrel as instructed on page 31.
4. Place the 2 mm driver (58), supplied, in the back
of the fluid needle assembly. Push the tool in and
turn it clockwise, slightly, to tighten the packings.
See Fig. 15.
5. Assemble the barrel as instructed on page 32.
6. Trigger the gun and install the seat housing (21)
with the 9 mm driver (64). Tighten the seat housing
until it's snug and then tighten it 1/8 turn more.
CAUTION
To avoid damaging the seat housing and gun bar-
rel, never over-tighten the seat housing. Over-tight-
ening may result in improper fluid shut-off.
7. Assemble the spray tip, air cap, and tip guard.
Then install them on the gun, securing them with
the retaining nut. Tighten the retaining nut firmly.
To tighten
packings
Fig. 15
Service
58
To remove
needle
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Fluid Needle Assembly Removal
1. Remove the retaining nut (8), tip guard, (2), air cap
(1) and spray tip (9). See Fig. 7, page 28. You may
have to turn the air cap with the tip guard to
remove the air cap from the gun.
2. Trigger the gun and remove the seat housing (21)
with the 9 mm driver (64). See Fig. 8, page 28.
3. Remove the barrel as instructed on page 31.
4. Remove the trigger screws (4) and trigger (13).
5. Place the 2 mm driver (58) in the back of the fluid
needle assembly (28). See Fig. 15. Push the tool
in and turn it counterclockwise about 12 full turns
to unthread the needle.
6. Insert the 2 mm driver (58) into the front of the gun
and push the fluid needle assembly (28) out the
back of the gun body.
CAUTION
To avoid damaging the needle assembly, be sure
the needle is completely unthreaded before push-
ing it out of the barrel.
7. Install the fluid needle assembly (28) into the gun
barrel. See Fig. 16. Push in on the needle with the
2 mm driver (58) and tighten the assembly clock-
wise until just snug, then 1/4 to 1/2 turn tighter.
8. Install the trigger (13) and tighten the trigger
screws (4).
9. Assemble the barrel as instructed on page 32.
10. Follow steps 6 and 7, at left, to finish assembling
the gun.
Fig. 16
28
4
13
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