Ransburg Evolver NE A11279-XX, A11281-XX, A11775-XX, A11776-XX - Manual (Page 32)

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Evolver NE Solventborne Robotic Atomizers - Maintenance
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 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 ap-
plicator.
7. Insert the lubricated o-ring [30] into the applicator
head. Gently push, with small flat object, down
upon its seating edge. Be careful not to push
o-rings into fluid groove (see Figure 5).
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
degrees.
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 5).
12. Reassemble air cap [35] and air cap retainer
[33]. The air cap rotate positioning pins must b e
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 engag-
ing the connection plug [24] into the mount-ing block
cavity [3], and turn clockwise until head contacts
stop pin on the block.
Air Valve Removal
(See Figure 6)
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 neces- sary,
by holding the air valve shaft on it's flats and loosen-
ing 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].
> Use caution as NOT TO scratch or raise
burrs on inside diameters of the parts.
C A U T I O N
!
5. Remove and replace all o-rings if necessary.
6. O-rings [12] and [18] must be installed inside
their mating parts (see Figure 6).
7. The o-ring [16] should be inserted into
the front of the bushing [14] and one of the o-rings
[15] installed onto the outside groove before the
bushing is installed.
AA-05-01.5