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GEARBOX
The gearbox Is • lePerate unit bolted to the
engine block and Incorporates constant mesh
gears with frontal engagement. It is pedal lever
controlled
from
the
l/H side of the
vehicle.
Five
speeds
(see
"g.
358/1):
1st. speed lever
down, other
speeds
lever up.
Engine gearbox ratio:
1:
1,235
(Z
=
17/
21)
Internal gear
ratios:
1 sl speed
1
:
2
(Z =
14/28)
2nd speed
1:
1,388
(Z
=
18/25)
3rd speed
1
:
1,047
(Z =
21
/22)
4th speed
1
:
0,869 (Z
=
23/20)
5th
speed
1
: 0,750 (Z
=
28/21)
REAR DRIVE BOX
Shaft
with double
cardan joint and gears.
Aatio
1
:
4,714 (Z
=
7/33)
Overall
ratio
(engine-wheel)
1st
speed
1
:
11 ,643
2nd
speed
1
:
8,080
3rd speed
1
:
6,095
4th
speed
1: 5,059
5th speed
1 :
4,366
Stripping the rear drive box
(fig.
~04)
First drain the
oil
by removing
the drain screw
with AI. washer ..
e
.. ,
the
filling screw
with
AI.
washer
..
8,.
and the level inspection screw with
AI.
washer .. A
•.
-
Undo
the screws securing
rear
drive
box to
rear
swinging
fork arm and
take off
the
rear dri-
ve
box
with the gasket (OR
type)
,,
0,.
.
-
From
the drive
box
remove
the housing with
pinion
"E.
and
gasket (OR type) "F·.
-
Flatten the
wings of the securing plates then
undo
the screws ..
G.
securing cover
..
H
..
to
box
..
1,..
-
Remove the
cover ..
H., the gaskets
..
L.
with
shim "M •.
-
From the
drive
box remove
the pierced pin
.. N,.
complete with
crown.
-
From the drive box remove
spacer
,,0
..
sea-
ling ring
"P,.
and roller
bearing
,,0·
.
Stripping the houllng
To remove
the nut securing
pini
on
to housing
use
holdfast tool
189271
50 (65 fig.
305) and
eye
wrench
;
after undoing
the nut take the fol-
lowing
off the housing:
-
bevel pinion with
shims;
-
bevel bearings;
-
spacer
between bearings;
-
shimw between
bearing and
spacer;
-
bare housing.
184
Selection
of
crown~plnlon
.... ,
Pinion
and
crown have
to
bear
the
same number.
(see
"
A
..
&
·
8,. fig. 306).
Assembling the houllng
Reverse
the
stripping sequence.
If no
part
has
been
replaced, ensure that
the
shim number
between spacer and bearing
as well as
between
bearing and pinion
is
the same.
In case
of
even-
tual
replacement
of parts,
it will be necessary to
adjust
this
shimming.
The nut has to be locked using holdfast tool
18927150 (65 fig. 305) and eye wrench.
Fitting the housing onto the drive box
(see
fig. 358/2)
In fitting the housing
"A,.
onto the rear drive
box
..
8" pay attention to
the
alignment
of
the
lubrication
holes
("e.
for drive box -
..
0
,.
for
housing); also
remember to fit the
sealing
ring
..
E,. (O
R
type)
between housing and drive box.
Crown Pinion matching
(see fig. 307)
Make sure
that the plane made by the
gears cou-
ple
is in
perfect corespondence
by
proceeding
as follows:
-
Secure the housing
to the
drive
box using
two nuts
.. A,.
and
washers.
-
Smear
the
crown teeth with
lead
oxide.
-
Rotate the pinion
,
keeping the
crown
braked
,
so
that such rotation
takes
place
under
load
lea-
ving a
contact
trac
e
on the crown painted
sur-
face.
If
this contact is
normal
,
the pinion teeth
trace
on
the
crown will be even along the
whole
tooth flank.
Also ensure that the pinion toothing
is
1
..;-
2 mm
longer
than the crown one
(see
arrow
..
8
,.)
.
Fitting the cover onto the drive box
(see fig.
308)
Proceed as follows:
-
Fit
the gasket "A
..
onto
the drive
box,
then
fit the shim
..
8
..
and
the othe
r
gasket
..
A ..
,
paying
attention to the alignment of the
holes
with the
ones on
the drive box.
The
cover
has
to
be
fitted onto the drive
box
paying
attention
that
the
wording
"
Basso·
(e)
is
downwards
and
caring for the alignment
of
the arrow on
the cover
..
B
,.
with the arrow
"E,.
on the drive
box, then
screw
in fully
but without
locking.
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