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ID
19
OPERATION
No.
ID
45 I- 3 :
Overhadin~
a brake unit
Op.
ID
451-3
283
15
16
17
ASSEMBLY
(see
Pl.
99
and
100).
To
assemble
the
movable
shoe
(see
Pl.
100,
fig.
4 and
5).
a)
Clean
the
movable
shoe
(15)
and
the
pistons
(47)
in
alcohol.
Blow
with
compressed
air.
b)
After
first
moistening
with
hydraulic
fluid,
insert
the
ring
seals
(48)
in
the
grooves
in
the
cylinders
of the
movable
shoe.
c)
Fit
the
pistons
(47)
in
the
cylinders
after
moistening
them
with
hydraulic
fluid.
NOTE
-
The
pistons
must
be
completely
free
from
scratches
or
dents.
If not,
refit
new
ones.
d)
Fit
the
circlips
(49j
on the
piston
push-rods
(46)
and
fit
the
rods
(46)
in
the
pistons
(47).
To
prepare
the
assembly
for
taking
up
the
clearance
(see
Pl.
100,
fig.
2 and
3).
a)
Examine
the
adjuster
wheel
(33).
Replace
if
the
teeth
are
damaged.
b)
Examine
the
adjustable
thrust
sleeves
(34)
and
(35).
Screw
the
male
sleeve
(34)
into
the
female
sleeve
(35)
as
far
as
it will
go.
Smear
the
parts
with
graphite
grease
(graphite
powder
base
grease
and
not
a flake
base).
NOTE
- The
left-hand
brake
unit
sleeve
has
a right-hand
thread
while
that
for
the
right-hand
brake
unit
has
a left-
hand
thread
marked
by
a groove
on
the
smooth
portion.
To
prepare
the
brake
carrier
plate
(see
Pl.
99
and
100)
:
b)
c)
Fit
the
needle
bearings
(44)
after
smearing
with
grease
(bearing
grease).
(Use
a mandrel
with
a shoulder).
The
lower
face
of
the
upper
bearing
must
stand
proud
about
0. 3 mm
from
the
bore
"b"
provided
for
the
rod.
The
upper
face
of the
lower
bearing
must
be
16 mm
from
the
other
bearing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To
adjust
the
lateral
clearance
of the
movable
brake
shoe
block
(see
PI.
99,
fig.
2).
Place
the
movable
block
(15)
in
position
and
hold
it
against
the
faces
of
the
brake
carrier
plate.
Use
a set
of feeler
gauges,
measure
the
clearance
between
the
movable
block
and
the
carrier
plate,
on the
other
face.
On
each
side
of the
movable
block
place
a shim
(32)
selected
from
among
those
sold
by
our
Spare
Parts
Department.
These
shims
must
give
a clearance
of between
0.2
and
0. 25 mm.
To
adjust
the
clearance
on the
mechanical
control
lever
(see
Pl.
99
and
100).
On
the
lever
(4)
place
either
the
lever
(5)
(left-hand
carrier
plate)
or
the
steel
cup
(right-hand
carrier
plate).
Engage
the
fulcrum
pin
of the
lever
(4)
in
the
carrier
plate.
Fit
a lower
washer
(37)
and
the
circlip
(36).
Push
the
fulcrum
pin
upwards
and
with
a set
of
feeler
gauges,
measure
the
clearance
between
the
lever
(5)
(left-hand
carrier
plate)
or
the
steel
cup
(right-hand
carrier
plate)
and
the
face
of
the
carrier
plate.
This
clearance
must
be
not
more
than
0.5
mm
with
the
fulcrum
pin
turning
freely.
To
obtain
this
clearance
place
a washer
(37)
0.5
mm
thick
between
the
circlip
(36)
and
the
lower
washer..
. . . . . ,
TOOLS
Shouldered
mandrel
:
Small
: 19.5
dia.
x 50
long
Large:
25.5
dia.
x 150
long
Circlip
pliers
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