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244
OPERATION
No.
ID
433-3
: Work
on the suqxnsion
units
ID
19
8
9
10
11
12
Turn
the
cylinder
and
tighten
the
nut
(17)
in
the
vice,
using
wooden
jaws
MR-3407-30
(see
P1.88,
fig.3).
Tighten
the
vice
moderately,
the
nut
being
tightened
only
to
14 ft.
lbs
(2 m.
kg).
Unscrew
the
cylinder
from
the
nut
(using
a "C"
spanner
fitted
on
the
feed
union
boss).
Remove
the
seal
thrust
washer
(18)
and
the
seal
(19)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Carefully
clean
the
parts.
Blow
with
compressed
air.
Assembly
(see
~1.86)
Fit
the
felt
seal
retaining
cup
(15)
on
the
nut
(17)
with
a press
(use
a bush).
Fit
the
rubber
seal
(19)
previously
soaked
in hydraulic
fluid,
in
the
seal
thrust
washer
(18)
. . . . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT
NOTE
- The
seal
thrust
washer
(18)
is
paired
with
the
piston
(14).
If
either
of
these
parts
has
to
be
renewed
the
cylinder-piston
assembly
must
be
replaced.
After
immersion
in
hydraulic
fluid,
fit
the
felt
seal
(16)
in
the
nut.
NOTE
- The
felt
washer
must
be
fitted
only
after
it
has
been
left
to
soak
in hydraulic
fluid
for
several
hours.
Fit
the
thrust
washer
and
seal
assembly
on
the
cylinder
(see
fig.
3 for
correct
positioning).
Fit
the
nut
( 17)
without
tightening
it.
Fit
the
piston.
NOTE
- If
there
is
only
slight
scoring,
it is
permissible
to
polish
lightly
with
abrasive
paper
No.
600.
Clean
carefully
and
blow
with
compressed
air.
Oil
the
piston
(hydraulic
fluid).
Insert
the
piston
in
the
cylinder.
Hold
the
cylinder
in the
vice
by
the
nut
(17)
(wooden
jaws
MR-3407-30).
Tighten
the
vice
moderately.
Tighten
the
cylinder
on
the
nut
to
14 ft.
lbs
(2
m.
kg),
using
a "C"
spanner
gripping
the
feed
union
boss
and
a torsion
spanner
(torsion
spanner
2472-T).
This
tightening
torsion
is
of
greatest
importance.
It must
be
adhered
to
in
order
to
ensure
perfect
fitting
of the
joint
thrust
washer,
and
to
prevent
chattering
of the
piston
in
the
cylinder
or
a serious
leakage
of
fluid.
Do
not
drop
the
piston
during
this
operation.
Make
sure
that
the
piston
slides
freely
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TOOLS
Wooden
jaws
MR-3407-30
Bush
O.D.
60 mm
I.D.
44
mm,
height
10 mm
Wooden
jaws
MR-3407-30
Torsion
spanner
2472-T
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