Ransburg Evolver 303 Dual Purge Solvent Robotic Applicator A12374-XXX - Manual (Page 41)

36
Evolver 303 Dual Purge Robotic Atomizers - Maintenance
Rear Needle Replacement
(See Figures 13a, 13b, 14, and 15)
1. Remove the air cap, fluid tip, and the fluid
nozzle as described in steps 1 through 8 in "Procedures
- 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 (longitudinal
grooves or a noticeable reduction in diameter) re-
place 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 applica-
tor 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 13b).
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 overtighten.
Note the front flange of the fluid nozzle will not seat
flush against the spray head.
9. Apply Loctite #222 Low Strength (purple) Thread-
locker 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 mak-
ing sure to maintain an 1/16" clearance (see Figure
13b).
> 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. Re-attach spray head to manifold block by en-
gaging the connection plug [24] (Figure 14) into
the mounting block cavity [3] (Figure 15), and turn
clockwise until head contacts stop pin on the block,
as shown in Figure 13a.
16. Secure with locking tab by turning screw counter-
clockwise (see Figure 13a).
AA-08-01.1