Barrel Installation - Graco PRO AA5500SC Instructions And Parts List

Barrel Installation

1. Be sure the gaskets (11, 27a) and spring (20) are
in place. See Fig. 37 . Replace if damaged.
2. Place the barrel (26) over the power supply (27)
and onto the gun body (29). Make sure the fluid
needle spring (20) is seated properly.
3. Pressing the barrel and handle together, tighten
the three screws (24) oppositely and evenly to 18
in-lbs (2 N m) maximum (about a half turn past
snug), using the ball end wrench (77); do not over
tighten.
4. Make sure the fluid filter (4) is in place, then
tighten the bottom fluid tube nut (C) onto the fluid
fitting (3); make sure the top fluid tube nut (D)
remains tightened.
CAUTION
To avoid damaging the gun, do
not over tighten the screws (24).
Tighten the screws to 18 in-lbs
(2 N m) maximum (about a half
turn past snug), using the
wrench (77) supplied only.
24
26
Tighten to 18 in-lbs (2 N m) maximum (about half turn past snug), using wrench provided
Install flush to end of piston rod
Adjust nut to create 0.125" (3 mm) gap between actuator arm (19) and nut (17)
Fig. 37
Service
5. Install the actuator arm (19) and jam nut (8), with
the jam nut assembled flush to the end of the pis-
ton rod.
There should be about a 0.125 in. (3 mm) gap
between the actuator arm (19) and the adjustment
nut (17) on the fluid shaft. Adjust the nut to obtain
these dimensions.
The jam nut (8) must be tightened securely to pre-
vent it from loosening during operation.
6. Install the spray tip (13), air cap (15), tip guard
(12), and retaining nut (1) as instructed on page
31. Tighten the retaining nut firmly.
7. Test gun resistance as instructed on page 26.
8. Install the gun onto the manifold and bracket as
instructed on page 39.
27a
27
11
20
C
D
29
17
4
19
8
3