AH-94-04.5
REA-90 and 90L Spray Guns - Maintenance
3 6
3 6
3 6
3 6
3 6
5.
With your finger, wipe the excess
grease from both ends of the packing
tube. Using the excess grease, apply a
thin film to the outer surface of the pack-
ing tube and to the external o-ring on the
cartridge seal.
>
Be generous with the dielectric grease
when applying it to the packing tube and
needle shaft. This helps to remove air
voids from this chamber. DO NOT apply
so much grease that it creates an air lock
during assembly of the gun.
N O T E
N O T E
N O T E
N O T E
N O T E
6.
Apply a light film of dielectric grease to
the seal retainer o-ring and install it into
the external groove.
7.
Insert the spring loaded u-cup into the
seal retainer (with the concave side fac-
ing outward). Use the short end of the
spacer to seat the seal.
8.
While holding the rear seal retainer sub-
assembly and spacer together, place
these components (with the spacer rear-
ward) onto the rear of the needle shaft
and slide them over the sealing area.
9.
Place the packing nut (large bore first)
on the rear needle shaft section.
10.
Screw the trigger adjustment nut onto
the rear needle shaft section with the
hexagon rearward and the spring re-
tainer with the hexagon forward. Do not
lock the hexagon nuts in place.
11.
Install the needle shaft subassembly into
the packing chamber from the rear of the
barrel with the needle/electrode forward.
12.
Push the needle shaft subassembly for-
ward until the packing nut will engage its
mating thread in the barrel and screw it
into place by hand approximately 3
turns.
13.
Pull the needle shaft rearward as far as
it will go.
14.
Install the fluid nozzle, air cap, and re-
taining nut. (Refer to "Air Cap" and
"Fluid Nozzle".)
15.
Tighten the packing nut using the span-
ner tool on the special multi-purpose gun
wrench until it bottoms.
16.
Push the needle shaft forward until the
needle/electrode seats into the fluid
nozzle.
17.
Adjust the trigger adjustment nut as far
forward on the needle shaft as possible.
18.
Adjust the needle shaft spring retainer
until the rear of the hexagon is 11/16-
inch from the rear surface of the barrel
packing chamber (refer to Figure 15).
Figure 14: Needle Shaft Assembly
Figure 14: Needle Shaft Assembly
Figure 14: Needle Shaft Assembly
Figure 14: Needle Shaft Assembly
Figure 14: Needle Shaft Assembly
into Barrel
into Barrel
into Barrel
into Barrel
into Barrel
Figure 15: Trigger Adjustment
Figure 15: Trigger Adjustment
Figure 15: Trigger Adjustment
Figure 15: Trigger Adjustment
Figure 15: Trigger Adjustment
Nut Dimension
Nut Dimension
Nut Dimension
Nut Dimension
Nut Dimension
