Ransburg MMA-303 Direct_Ind Charge Atomizer A12870 - Manual (Page 71)

MMA-303 Direct/Indirect Charge - Maintenance
LN-9269-11.3 68
to remove paint build-up from the serration
cuts, paint feed holes or slots, and exter-
nal and internal surfaces of the bell.
9. Check the well cavity in the back of the bell
cup. This cavity must be cleaned manual-
ly. It will not be cleaned during purge cy-
cles 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).
Bell Cup Replacement
Bell cup wear is dependent on many factors
such as bell speed, flow rate, and type of coat-
ing being applied.
The bell cups shown in the photos indicates 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 ex-
tending towards the outer edge of the cup.
Photo 1
Photo 2