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SECONDARY
POWER P\ TO~
Figure 11-Positioning Secondary Power Piston on Tool 1-23101
POWER
PISTON
GROUP
DISASSEMBLY
(Figure 10)
1 . Lift the bead on the outside diameter of
the secondary diaphragm .
2 . Remove
the
piston
rod
retainer
and
piston rod from the secondary piston .
3 . Mount double-ended Tool J-23101 (with
large diameter end up) in a vise .
Position the
secondary power piston so that the two radial
slots in the piston fit over the ears (tangs) of
the tool (figure 11).
4. Fold back the primary diaphragm from
the outside diameter of the primary support
plate .
Grip the edge of the support plate and
rotate counterclockwise to unscrew the pri-
mary power piston from the secondary power
piston .
NOTE :
It is
possible
that . the primary
support plate will unlock from the primary
piston before the primary piston unscrews
from the secondary piston .
If this happens,
continue to turn the primary support plate
counterclockwise .
Tabs (stops) on the pri-
mary
support
will
temporarily
lock
the
primary support plate to the primary power
piston and permit continued counterclock-
wise rotation to unscrew the primary power
piston
from
the secondary power piston .
(figure 12) .
housing divider from
piston .
Remove
piston
bearing
from
5 . Remove the
secondary
power
secondary
power
housing divider .
6 . The secondary power piston
be positioned on Tool J-23101 .
the
the
the
should still
Fold back
secondary diaphragm from outside diameter of
Figure 12-Locking or Unlocking Primary and
Secondary Power Pistons
BRAKES 5-7
secondary support plate . Grip the edges of the
support plate and rotate clockwise to unlock
the
secondary
support
plate
from
the
secondary power piston (figure 13).
7 . Remove the secondary diaphragm from
the secondary support plate .
8 . Remove the reaction piston and reaction
disc from the center of the secondary power
piston by pushing down on the end of the
reaction piston with a small object, such as a
pencil, wooden dowel or metal rod (figure 14) .
9. Remove the air valve spring from the
end of the air valve (if it didn't come off
during disassembly of the power piston) .
10 . Mount Tool J-23101 in a vise (with small
diameter end up) . Position the primary power
Figure 13-locking or Unlocking Secondary Support Plate
and Secondary Power Piston
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