Ransburg Evolver Solvent Robot Applicator 79190-XXXXXXXX - Manual (Page 35)

Rear Needle Replacement
(See Figure 8)
1. Remove the air cap, fluid tip, and the fluid nozzle
as described in steps 1 through 8 of the "Fluid
Tip, Nozzle, and Front Needle Replacement" in
the "Maintenance" section.
2. Remove the rear needle [6] and lock nuts [4]
and [5] as an assembly. Pull the assembly out
from the rear of the spray head.
>
Fluid seal [29], seal washer [28], and seal
spring [27], will come free at this point. Place
hand over end as not to drop parts.
C A U T I O N
!
3. Inspect metal portion of the rear needle [6] for
excessive wear. If wear is observed (longitudinal
grooves or a noticeable reduction in diameter),
replace the needle. Remove the two (2) lock nuts
from the rear needle and save. When ever re-
placing rear needle section, you must also replace
the seal [29] at the same time.
4. Place the rear needle assembly back into the
spray head.
5. Place seal spring [27] over the rear needle in
the front end of the spray head. Hold the spray
head upward as the spring will want to fall out.
6. Still holding the spray head upward, place the
seal washer [28] and thread the fluid seal [29] onto
the rear needle. The tapered end of the fluid seal
should be pointed toward the front of the gun.
7. Insert the lubricated o-ring [30] into the gun
head. Gently push, with small flat object, down
upon its seating edge. Be careful not to push
o-rings into fluid groove (see Figure 8).
8. Reassemble fluid nozzle [32] by pushing the
nozzle into the spray head and through the o-ring
until the threads engage. Screw the nozzle into
the spray head. Torque to 23-25 lbs•in (2.6-2.8
Nm). Plastic threads damage easily; do not over-
tighten. Note the front flange of the fluid nozzle
will not seat flush against the spray head.
9. Apply Adhesive #222 Low Strength (purple)
Threadlocker into the threads of plastic front
needle [31] before assembling onto the rear needle.
Be sure that the rear needle assembly is pushed all
the way forward before threading on front needle.
10. Reassemble fluid tip [34]. Hand tighten first;
then with a small wrench turn an additional 30°.
11. Reinstall the two (2) lock nuts [4] and [5] in the
correct order on the back needle as shown making
sure to maintain an 1/16" clearance (see Figure 8).
12. Reassemble air cap [35] and air cap retainer
[33]. The air cap rotate positioning pins must be
engaged with the air cap locator holes before
final tightning.
13. Apply a thin film of petroleum jelly to valve
spring [3] and needle spring [2], and insert back
into the end cap. Screw end cap [1] back on.
14. Lubricate all of the o-rings on the underside
of the spray head with petroleum jelly, and apply
a thin coat of dielectric grease to the grooves of
the spray head and the valve manifold before
reassembly.
15. Reattach spray head to manifold block by en-
gaging the connection plug [24] into the mounting
block cavity [3], and turn clockwise until head
contacts stop pin on the block.
Air Valve Removal
(See Figure 9)
1. After removal of end cap and spring, the air
valve can be pulled straight out the back of the
head assembly.
2. Inspect and replace the u-cup [8], if necessary,
by holding the air valve shaft on it's flats and loos-
ening the piston nut [7] counter-clockwise.
3. Remove the seal carrier with seal removal
tool [B].
4. Use a bent hook to reach inside the air valve
bushing [14], grip slot and pull out. Use the same
procedure to pull out the rear seal carrier [17].
5. Remove and replace all o-rings if necessary.
6. O-rings [12] and [18] must be installed inside
Evolver Solventborne Robotic Atomizers - Maintenance
31
Ransburg
AA-03-02.12