Ransburg Evolver 303 Solvent Applicator A11976-XXX - Manual (Page 37)

Rear Needle Replacement
(See Figures 10a, 10b, 11, and 12)
1. Remove the air cap, fluid tip, and the fluid
nozzle as described in steps 1 through 8 in "Pro-
cedures- Applicator Cleaning / Service" 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 front end to prevent dropping parts.
C A U T I O N
!
3. Inspect the metal portion of the rear needle
[6] for excessive wear. If wear is observed (lon-
gitudinal grooves or a noticeable reduction in
diameter) replace the needle. Remove the two (2)
lock nuts from the rear needle and save. When
ever replacing 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
applicator.
7. Insert the lubricated o-ring [30] into the appli-
cator head. Gently push, with a small flat object,
down upon its seating edge. Be careful not to push
o-rings into fluid groove (see Figure 10b).
8. Reassemble fluid nozzle [32] by pushing the
nozzle into the spray head and through the o-ring
until the threads engage. Screw the noz-
zle into the spray head. Torque to 23-25 lbs•in
(2.6-2.8 Nm). Plastic threads damage easily; do
not overtighten. 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
10b).
>
Ensure that the fan and atomization air
are on and flowing prior to triggering the
fluid. Ensure air before fluid adjustment
is correct. Failure to follow this sequence
will cause spits and defects on the part
being painted.
NOTE
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
engaging the connection plug [24] (Figure 11)
into the mounting block cavity [3] (Figure 12), and
turn clockwise until head contacts stop pin on the
block, as shown in Figure 10a.
16. Secure with locking tab by turning screw
counter-clockwise (see Figure 10a).
34
Evolver 303 Robotic Atomizers - Maintenance
Ransburg
AA-07-03.2