Ransburg Aerobell 168 A12787 - Manual (Page 47)

Aerobell 168 - Maintenance
LN-9270-12.3 44
O-RINGS
All O-rings in this atomizer are solvent proof
except 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 engi-
neered to provide a fit between the air bearing
spindle and it's mating parts to reduce or elimi-
nate 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 procedures 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. Flush-
ing should be done before any break in pro-
duction. If the Aerobell 168 is mounted verti-
cal-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 appro-
priate solvent as long as necessary to loosen
paint. Use a soft bristle brush dipped in sol-
vent 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 tur-
bine 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 shap-
ing air ring will prevent paint build-up which
does affect pattern control or cause defects in
parts being coated. Follow "Cleaning Shap-
ing 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 rec-
ommended).
Using as atomizer bell with paint buildup will
cause a bell imbalance. An imbalance bell
may cause bearing damage and turbine fail-
ure. Also, any paint residue caught between
the tapered surfaces can prevent the bell from
seating properly and result in an imbalance
condition.
! C A U T I O N