Ransburg RMA Indirect A11600 - Manual (Page 49)

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 solvents 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 spray-
ing batch parts of the same color. Verify that
high voltage is in degrade mode of 40-50 kV and
that the atomizer 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, spash 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, re-
place 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 entire 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 loosening
or removing paint build-up. It is recommended
that the splash plate be removed and cleaned
seperately.
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 internal
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 interior or
exterior cup flushes.
10. A soft, lint free rag dampened with solvent
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 residue,
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 installing 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.
14. Reinstall cups to proper torque 50-70 lbs•in
(5.65 - 7.91 Nm).
RMA-303 Indirect Charge - Maintenance
Ransburg
LN-9252-06.4 45 LN-9252-06.4