Ransburg RMA-560 Single_Dual Purge Direct A13364 - Manual (Page 51)

Bell Cup Handling
Always verify that high voltage is turned off and
the atomizer bell has stopped spinning before
performing any type of handling maintenance.
Bell Cup Replacement
Bell cup wear is dependent on many factors such
as bell speed, flow rate, and type of coating being
applied.
The bell cups shown in the photos below indicate
if a bell cup has some useable life or should be
replaced. Photo 1 shows a bell cup that has some
useable life. The grooves worn around the splash
plate pins are shallow. The general appearance
of the cup surface is smooth and uninterrupted.
Photo 2 shows a bell cup that needs to be replaced,
as well as the splash plate that was installed into
the cup. The grooves are deep, a visible groove
exists at the outer edge diameter of the splash
plate and there are noticeable lateral grooves
extending towards the outer edge of the cup.
Photo 1
Photo 2
LATERAL LINES
OR GROOVES
DEEP
GROOVES
SMOOTH CLEAN
UNINTERUPTED
BELL CUP
SURFACE
LIGHT VISIBLE WEAR
NEAR SPLASH PLATE
OUTER EDGE
SLIGHT, SHALLOW
GROOVES
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 electrostat-
ic 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 spraying batch parts
of the same color. Verify that high voltage is
in 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
cup should be removed for hand cleaning.
The bell’s leading edge, splash plate, serra-
tion cuts, and rear of cup are some exam-
ples 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 maximum).
Bell cups alone may be soaked for an ex-
tended 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 immediately
5. Remove splash plate. Inspect for wear on
the bell cup where the fluid leaves the large
diameter of the splash plate. If any under-
cut in this area, the cup should be replaced.
RMA-560 Single/Dual Purge Direct Charge - Maintenance
Ransburg
LN-9278-13 48