Ransburg 75785 Service Manual page 44

REA-90 and 90L Spray Applicators - Maintenance
4. Insert the needle shaft, rear section first, into
the packing tube. Rotate the needle shaft while
moving it back and forth inside the packing tube
until fully inserted.
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
packing tube and to the external o-ring on the
cartridge seal.
N O T E N O T E N O T E
N O T E N O T E
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.
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 facing 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 rearward) 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 retainer with the hexagon forward.
Do not lock the hexagon nuts in place.
11. Install the needle shaft sub-assembly into the
packing chamber from the rear of the barrel with
the needle/electrode forward.
3 9 3 9 3 9 3 9 3 9
12. Push the needle shaft sub-assembly forward
until the packing nut will engage its mating thread
in the barrel and screw it into place by hand
approximately 3 turns.
Figure 12: Needle Shaft Assembly Figure 12: Needle Shaft Assembly Figure 12: Needle Shaft Assembly Figure 12: Needle Shaft Assembly Figure 12: Needle Shaft Assembly
into Barrel into Barrel into Barrel into Barrel into Barrel
13. Pull the needle shaft rearward as far as it will
go.
14. Install the fluid nozzle, air cap, and retaining
nut. (Refer to "Air Cap" and "Fluid Nozzle" in the
"Maintenance" section.)
15. Tighten the packing nut using the spanner
tool on the special multi-purpose applicator wrench
until it bottoms.
Figure 13: Trigger Adjustment Figure 13: Trigger Adjustment Figure 13: Trigger Adjustment Figure 13: Trigger Adjustment Figure 13: Trigger Adjustment
Nut Dimension Nut Dimension Nut Dimension
Nut Dimension Nut Dimension
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.
AH-94-04.7