Ransburg RMA Indirect A12869 - Manual (Page 58)

RMA-303 Indirect Charge - Maintenance
53 LN-9268-11.4
BELL CUP CLEANING
Always verify that high voltage is in degrade
mode of 40-50 kV and that the atomizer bell is
spinning before performing any type of color
change or bell flush cleaning cycle.
To reduce the risk of fire or explosion, the sol-
vents used for exterior cleaning must have
flash points above 100°F (37.8°C). Since
electrostatic equipment is involved, these sol-
vents should also be non-polar.
Solvents used for equipment flushing should
have flash points equal to or higher than those
of the coating material being sprayed.
1. The atomizer bell will normally be fully
cleaned during a bell flush cycle. Flushing
should be done before any down time or
break in production. A bell flush cycle may
also be required while spraying batch parts of
the same color. Verify that high voltage is in
degrade mode of 40-50 kV and that the atom-
izer bell is spinning before flushing through
the bell.
2. If there is any remaining paint build-up on
any areas of the bell after flushing, the bell
cup should be removed for hand cleaning.
The bell's leading edge, splash plate, serration
cuts, and rear of cup are some examples of
areas for special attention.
Manual Inspection
3. Visually inspect the bell cup edge for signs
of abrasion. If the edge is excessively worn or
badly chipped as the result of a collision with a
part, replace the cup immediately. ("Bell Cup
Preventive Maintenance, Photos 1 and 2" in
this section.)
4. Remove splash plate. Inspect for wear on
the bell cup where the fluid leaves the large
diameter of the splash plate. If any undercut
in this area, the cup should be replaced. Also,
check the three (3) pins between the front and
rear splash plate halves. If worn, replace en-
tire assembly.
5. Check the center holes of the splash plate
for wear. Hold splash plate up to a light
source and look straight into the holes. If light
is clearly seen, splash plate must be replaced.
6. Splash plate assemblies may be soaked
for a short time, under 2 hours, to loosen dried
material. Clean with a soft bristle brush. Blow
out center holes to dislodge material. Never
use any kind of pick instrument to clean these
holes.
7. Soaking the bell in solvent may aid in loos-
ening or removing paint build-up. It is recom-
mended that the splash plate be removed and
cleaned separately.
8. Use a soft bristle brush dipped in solvent to
remove paint build-up from the serration cuts,
paint feed holes or slots, and external and in-
ternal surfaces of the bell.
9. Check the well cavity in the back of the bell
cup. This cavity must be cleaned manually. It
will not be cleaned during purge cycles or inte-
rior or exterior cup flushes.
10. A soft, lint free rag dampened with sol-
vent may be used to remove any paint residue
from the external and internal surfaces of the
bell.
11. After removing all paint build-up or resi-
due, rinse the bell in clean solvent and blow
dry.
12. Before reinstalling the bell on the shaft,
check the mating surfaces of the thread and
taper for any paint build-up or residue. Also,
check the fluid tip, fluid tube outside diameter,
and the shaft for any further paint build-up.
These surfaces should be cleaned before in-
stalling the bell.
13. It is recommended that extra bell cups be
purchased. The cups can then be cleaned off
line in an automated cup cleaner.