Ransburg Aerobell 168 Atex Approved 13350 - Manual (Page 44)

O-RINGS
All O-rings in this atomizer are solvent proof ex-
cept the ones in the air bearing spindle. These
O-rings must not be soaked in solvent; if these
are exposed or soaked in solvent, they must
be replaced. These O-rings are engineered to
provide a fit between the air bearing spindle and
it’s mating parts to reduce or eliminate harmonic
resonance (vibration).
Some O-rings are PTFE encapsulated. These
O-rings have a limited amount of stretch and will not
return to their original diameters if over-stretched.
These O-rings are subject to being distorted more
easily than rubber O-rings, so it is important that
they be sufficiently lubricated when mating parts
are installed onto them. They also will take a square
set over time and should be replaced periodically
if mating parts are removed repeatedly or if a new
mating part is installed onto them.
Any O-ring that is cracked, nicked, or distorted
must be replaced.
A suitable lubricant is food grade petroleum jelly
or A11545-00 Petrolatum Jell.
Cleaning Procedures
The precise sequence of flushing the system of
paint will vary according to the type of color valve
arrangement used, and other automatic features
built into the system. But follow these basic pro-
cedures when cleaning:
1. Verify high voltage is off.
2. With the bearing air and turbine air on, flush
paint out of material lines with solvent. Flushing
should be done before any break in production.
If the Aerobell 168 is mounted vertical-facing
up, rotate to horizontal plane before flushing or
cleaning.
3. Flushing should be done with the atomizer
bell cup installed. The bell cup will normally be
fully cleaned with flushing. However, if there is
any remaining paint build up on any areas of the
bell after flushing, the bell should be removed for
hand cleaning.
4. Clean the bell cup by soaking in an appropriate
solvent as long as necessary to loosen paint. Use
a soft bristle brush dipped in solvent to remove
paint. Make sure all signs of paint are removed
(See the following “Warning”). Rinse and dry bell.
Using a non-metallic item (toothpick), clean the
center holes of the splash plate. Using plenty of
cleaning fluid, flush these holes towards rear of
bell cup. Make sure these holes are clean.
5. Before reinstalling the bell onto the shaft, check
the tapered mating surfaces of the turbine shaft
and bell for any paint residue. Clean any residue.
(See “Warning” below.)
6. Clean the exterior of the Aerobell 168. (See
“Warning” below.)
7. Do not reuse an atomizer bell that shows signs
of damage such as nicks, heavy scratches, dents,
or excessive wear.
8. Periodic cleaning of the holes in the shaping air
ring will prevent paint build-up which does affect
pattern control or cause defects in parts being
coated. Follow “Cleaning Shaping Air Holes and
Annulus” in the “Maintenance” section and clean
the slots of the shaping air ring using a soft bristle
brush.
To prevent paint build-up in holes of shaping air
ring while installed, clean shroud assembly with
shaping air ON. Clean with a damp rag or soft
bristle brush. Do not soak or saturate area to force
fluid or paint into the holes or annulus (70-100
SLPM of shaping air is recommended).
C A U T I O N !
† Using as atomizer bell with paint buildup
will cause a bell imbalance. An imbalance
bell may cause bearing damage and turbine
failure. Also, any paint residue caught be-
tween the tapered surfaces can prevent the
bell from seating properly and result in an
imbalance condition.
Aerobell 168 - Maintenance
Ransburg
LN-9247-13 41