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 Note. To
install
a
new
tube
with
brackets
assembly,
mounting
holes
in
new
brackets
must
be
line-reamed
in
position
to
1.125
to
1.128
inches
in
diameter.
(2) Install spring seat (par. 55e).
(3) Install springs (par. 86e).
(4) Install axles (par. 85g).
(5)
Install
rods
88d).
(6) Install wheels (par. 52e).
(7) Remove blocking, jacks, and lifting equipment, and re-
turn semitrailer to level position.
REPAIR AND REBUILD OF BRAKES AND
Section IV.
BRAKE SYSTEM COMPONENTS
90.
Internal
Brake
Mechanisms
a. Semitrailer M270A1.
(19 R e m o v a l . Refer to paragraph 58b.
(2) C l e a n i n g , disassembly,
inspection,
repair,
and
assem-
Refer to TM 9-1827C.
bly.
(3) Installation. Refer to paragraph 58c.
b. Semitrailers M27O and M269.
Note. The
key
letters
shown
in
parentheses
are
in
(1) R e m o v a l .
(a) Remove
brake
shoes
57a).
(b) R e m o v e
brake
camshaft
(c) If
damaged,
remove
backing
plate.
Drill
out
10
riv-
ets (E) which secure each plate to flange of axle
and remove plate from axle.
(2) C l e a n i n g . Clean all parts with mineral spirits paint
thinner. Dry thoroughly before inspecting or install-
ing
on
semitrailer.
(3) I n s p e c t i o n
and
repair.
(a)
Brake
shoes
and
lining. Check
fit
of
brake
shoe
(A-3) on anchor pin (L) by shaking shoe by hand.
Should excessive wear be apparent replace bushing
(A-7) and/or anchor pin (L) and burnish bushing
to
the
tolerance
specified
in
Check
for broken shoe tension spring (G); replace if broken
or ineffective. Inspect lining (A-1) for wear. The
minimum thickness of lining before relining cannot
be specified exactly and is a matter of judgment,
depending
upon
usage
and
amount
of
time
before
next regular inspection. In any case if braking sur-
face is near heads of rivets, lining must be replaced.
(b)
Backing
plate
and
needle
bearing. Inspect for bent
TAGO 1321B
133
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