Fluid Packing Adjustment; Fluid Needle Assembly Removal - Graco PRO AA5500sc unicarb Instruction 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. Prepare the gun for service as instructed on
page 31.
2. Remove the seat housing (14) with the 9 mm
driver (84), supplied. See Fig. 30, page 33. The
seat housing (14) must be removed before adjust-
ing the fluid packings.
3. Remove the barrel as instructed on page 38.
4. Place the 2 mm driver (79) into the back of the
fluid needle assembly. See Fig. 42. Push the tool
in and turn it clockwise, slightly, to tighten the
packings.
5. Install the seat housing as instructed on page 33.
6. Assemble the gun as instructed on page 42.
To tighten
packings
Fig. 42

Fluid Needle Assembly Removal

1. Prepare the gun for service as instructed on
page 31.
2. Remove the seat housing (14) with the 9 mm
driver (84), supplied. See Fig. 30, page 33.
3. Remove the barrel as instructed on page 38.
Service
79
To remove
needle
03241
4. Place the 2 mm driver (79) in the back of the fluid
needle assembly (28). See Fig. 42. Push the tool
in and turn it counterclockwise about 12 full turns
to unthread the needle.
5. Insert the 2 mm driver (79) 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 fluid needle assembly (28),
completely unthread the needle before pushing it out
of the barrel.
6. Apply petroleum jelly or dielectric grease to the
new fluid needle assembly (28) and install it into
the gun barrel. See Fig. 43.
7. Push in on the needle with the 2 mm driver (79)
and tighten the assembly clockwise to 4.5–5.0
in-lbs (0.5–0.6 NSm) [about 1/4 to 1/2 turn past
snug]. See Fig. 42.
8. Install the seat housing as instructed on page 33.
9. Assemble the gun as instructed on page 42.


Apply petroleum jelly or dielectric grease to the fluid needle (28).
Tighten the fluid needle with the driver (79-see Fig. 42) to
4.5–5.0 in-lbs (0.5–0.6 NSm) [about 1/4–1/2 turn past snug].
Fig. 43


28
03242
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