Ransburg RMA Direct A12867 - Manual (Page 67)

RMA-303 Direct Charge - Maintenance
LN-9266-11.3 64
BELL CUP CLEANING
Always verify that high voltage is OFF 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 off and that the atomizer bell is spin-
ning 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, ser-
ration cuts, and rear of cup are some ex-
amples of areas for special attention.
Bell Cup Soaking
3. Bell cups and splash plates can be soaked
in a heated solution for up to 2 hours in an
ultrasonic cleaner (120°F. 49°C maxi-
mum). Bell cups alone may be soaked for
an extended amount of time.
Manual Inspection
4. 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 imme-
diately
5. 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.
6. 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, the angled holes are
worn and the splash plate must be re-
placed.
7. 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 in-
strument to clean these holes.
8. Soaking the bell in solvent may aid in loos-
ening or removing paint build-up. It is
recommended that the splash plate be
removed and cleaned separately.
9. Use a soft bristle brush dipped in solvent
to remove paint build-up from the serration
cuts, paint feed holes or slots, and exter-
nal and internal surfaces of the bell.
10. 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.
11. 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.
12. After removing all paint build-up or resi-
due, rinse the bell in clean solvent and
blow dry.
13. 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.