HEAVY
DUTY
POWER
BRAKES
5C-3
Fig.
5C-2
Valve
Rod,
2.
Place assembly in arbor press (Fig.
5C-3A)
with
rear
shell and spanner wrenches up
0
Secure
tool
J-8433 to press to prevent tilting of front shell.
3.
Compress assembly sufficiently
enough
to allow
rotation of
tools
J-9504.
CAUTION:
Do not compress assembly to the point
of
damaging power unit.
4.
Scribe a
mark
across front and
rear
shell to
facilitate assembly.
5. Rotate spanner wrenches (J-9504) counter-
clockwise to release position (to point where cutouts
J
22553-1
J
8433
J
9504
J
6407-2 1
Fig.
5C-3
Power
Unit
Special
Tool
Combination
liners,
Filters
and
Poppet
in
front shell are in line with lances in
rear
shell).
6. Slowly release pressure on assembly.
CAUTION:
Diaphragm return
spring
is under
pressure.
Use
care
in separating
shells
to
avoid
the
spring
flying
out.
REMOVAL
OF
REAR
SHELL
VACUUM
SEAL
(Fig.
5C-JJ
Place
rear
shell on bench with studs up and drive
out seal with punch or screwdriver.
NOTE:
Do NOT remove
rear
seal
unless
seal
is
defective.
DIAPHRAGMS,
PLATES,
RETAINER
AND
PLUNGER-
REMOVE
(Fig. 5C-4)
Wet
rear
diaphragm spring retainer with alcohol
and
remove, using fingers only. Remove
rear
dia-
phragm
from
rear
plate. Set
1-1/16"
hex bar stock
about 2" long or
tool
J-22839
in bench vise. Set
Diaphragm
and Plate assembly on hex stock with hex
opening in center of front plate on bar. Twist
rear
plate counterclockwise, using hand leverage only
either on atmospheric pressure channel or on out-
side circumference of
rear
plate.
After
plates have
been
loosened,
remove assembly
from
vise and
complete
disassembly on bench, front
plate down. Unscrew
rear
plate completely and care-
fully
lift it off front plate hub, grasping valve plunger
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