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REAR WHEEL DRIVE
RATIO:
Bevel
gear
ratio
(gearbox-wheel)
:
(Z
9/
34)
1
:
3,788.
OVERALL
RATIO
(engIne-wheel):
-
1st
speed (low)
-
2nd speed (Drive)
1
:
6,12;
1
: 4,58.
REMOVAL OF THE REAR DRIVE BOX
(Iig
.
304)
Before removing the rear drive box, drain the
oil by undoing the drain
screw
.. C
..
with AI.
washer.
the filling screw
"
B
..
with AI.
washer
and
the
level inspection screw ..
A
,.
its
AI.
washer:
-
loosen
the
nuts securing
rear drive box to
rear
swing
arm and
lake
all
the box with
the
gasket (OR
type)
..
D
.. ;
-
from the
box
take
off
the housing
complete
w ith
pInion
..
E
..
and gasket (OR
type)
..
F
-;
-
flatten the
securing
plate wings
and loosen
the
screws "G ..
which
secure
the
cover
..
H
..
to
the box
"I
.. ;
_
remove
the
cover
..
H
..
and
the gaskets
"
L
..
with
shim ..
M
.. ;
_
from the box take
olf
the drilled pin
..
N
..
with
crown;
-
then take
all
spacer
..
0
..
seal
ring
..
P
..
roller bearing
..
a
-.
DISMANTLING
OF THE HOUSING
To loosen the nut
securing pinion
to
housing
use proper tool 189271
50
(65
in
lig.
305)
and
wrench.
The nut
loosened,
the lollowing parts can be
removed from the housing
:
-
bevel
gear with shims;
-
bevel bearings;
-
spacer between
bearings
:
-
shims between
bearing
and
spacer:
-
finally, base
housing.
SELECTtON OF
PINION·
CROWN
Pinion
and crown
must have
the
same number
(see
..
A
..
and
..
8
..
fig
.
306)
.
ASSEMBLING OF THE HOUSING
To
assemble,
reverse the dismantling
sequence;
if
no part has been replaced
,
ensure that there
is
the
same
quantity of
shims spacer/bearing
and bearing
/
pinion.
If
some
replacement
has been made, it will be
necessary
to
adjust shim ming.
The nut must be locked using
tool
1892
71
50
(65
in
fig.
305)
an
d proper
eye
wrench.
FITTING
OF
THE
HOUSING ONTO THE BOX
(Iig
. 306/
1)
When
fitting the housing
..
A
•
on the box
..
B
..
pay
attention to align
the
box lubricating holes
..
B.o
with the housing lubricating holes
..
c
-:
remember to
fit
the seal ring
..
O
.o
(OR type)
between
housing and
box.
Also
ensure that,
when
fitting
the connection
sleeve between pinion
and
cardan shaft
"
E
.. ,
the
sleeve
hollowed
side
faces
the bevel pinion
..
I
,.
(see arrow
..
F
.
).
When IItting the com·
plete rear drive
box, onto
the
rea
r
swing
arm,
remember
to
fit
the seal
ring
..
G
"
(OR
type)
between
box and
arm.
COUPLING
, PINION· CROWN
(Iig.
307)
Check
the
correspondence of
the
plane formed
by the
gear
couple.
Th
is
checking
is
made as foHows
:
-
provisionally secure
the
housing to the
rear
drive box, using
two
nuts
..
A
_
with
washer
;
-
smear
the
crown
teeth with
lead oxyde
:
-
rotate
the
pinion,
hold the crown in such
a way that
the rotallon leaves a contact
trace
on
the
crown smeared
surface.
If
contact is
normal,
the trace 01 the pinion
teeth
on
the
crown
will
be even along the
whole tooth
flank.
Also
make sure
that the
pinIon
teeth
are
1
+-
+-
2
mm
longer
that the
crown teeth (see ar·
row
..
8
,,).
FITTING OF THE COVER
ONTO
THE
REAR DRIVE BOX
(fig.
308)
Proceed
as
follows
:
-
onto the
box fit 'irst the gasket
..
A
.. ,
then
the shim
..
B
"
and finally
the
other gasket
..
A
_;
pay
attention
to the
alignment of the
lUbrication
holes.
Also
pay attention
that
the
wording
..
BASSO
"
..
C
..
is downwards
and
the arrow
stamped
on
the
cover
..
0
..
is aligned
with
the arrow starn·
ped
on
the box
..
E
..
;
this checked, screw in
the
screws
fully but
without locking
.
CHECKI NG THE CLEARANCE BETWEEN
PINION
AND CROWN
(fig.
309)
-
Insert the legs
of
a
universal puller
..
A
..
and connect
them
inside the ass.y crown-
drilled pin;
-
lit
also
a piece
of light alloy
..
B
.. and screw
the puller
on
this
piece;
-
using
one
hand rolate the pinion
..
C
.. ,
the
other hand
will draw
and
release the
tool
..
A
..
In
such a way as to make
sure
that
the clearance Is normal.
II
clearance
is
not
normal,
it is
necessary
to
replace the
shim ..
B
.. in fig.
308 to bring
clea·
rance to
normal
tolerance.
145
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