Ransburg RMA Dual Purge Direct A12300 - Manual (Page 65)

RMA-303 Dual Purge/Direct Charge - Maintenance
60
BELL CUP CLEANING
Always verify that high voltage is off and that the
atomizer bell is spinning before performing any
type of bell flush cleaning cycle.
To reduce the risk of fire or explosion, the solvents
used for exterior surface cleaning must have flash
points above 100°F (37.8°C). Since electrostatic
equipment is involved, these solvents must 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 off 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 should be
removed for hand cleaning. The bell's leading
edge, spash plate, and serration cuts are some
examples of areas for special attention.
Bell Cup Soaking
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 maximum). Bell cups alone
may be soaked for an extended amount of time.
Manual Inspection
3. Visually inspect the bell cup edge for signs of
abrasion. If the edge is worn or chipped as the
result of a collision with a part, replace the cup
immediately.
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 splash plate
assembly.
5. Check the center holes of the splash plate for
wear. The holes are angled and when new, you
can not look directly through them straight on.
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 replaced.
6. Splash plate assemblies may be soaked for
a short time, two hours or less, to loosen dried
ma-terial. Clean with a soft bristle brush. Blow
out center holes to dislodge material. Never use
any kind of pick instrument to clean these holes,
as it will damage them.
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
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 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. Heavy buildup in this area
may cause imbalance resulting in turbine failure.
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 atomizer.
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 when the second set
is in production.
14. Reinstall cups to proper torque 50-70 lbs•in
(5.64-7.91 Nm).
Ransburg
LN-9263-08.5