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ID
19
OPE
RAT1
ON
No.
ID
3 30 - 3 :
Overhading
the gearbox
Op.ID
330-3
153
23
To
prepare
the
gearbox
cover
(see
P1.46
and
47):
b)
4
Use
the
mandrels
1793-T
(see
P1.56).
Insert
the
mandrel
(A),
through
the
right
hand
side
of
the
gearbox
cover.
Fit
the
reverse
speed
fork
shaft
control
lever
(94)
( see
P1.46
for
positioning
the
levers).
Fit
one
distance
piece
(82),
the
3rd
and
4th
speed
fork
shaft
control
lever
(95),
one
distance
piece
(82),
the
1st
and
2nd
speed
fork
shaft
control
lever
(79),
the
distance
piece
(78)
and
the
circlip
(69).
Using
a set
of
feeler
gauges,
measure
the
clearance
"b"
between
the
thrust
face
of
the
cover
and
the
circlip
(69).
Select
a shim
of
appropriate
thickness
frqrn
those
sold
by
our
Spare
Parts
Department,
in
order
to
obtain
a
clearance
ofbetween
0.15
and
0.25mm
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To
fit
the
forks
(see
Pl.
46
and
47):
Remove
the
circlip
(69),
the
shim
(77),
the
distance
piece
(78).
Engage
the
locking
plungers
(81),
the
1st
and
2nd
speed
fork
shaft
(96),
fit
the
fork
(97)
on
the
shaft.
Put
the
control
lever
(79)
in
position
in
the
groove
on
the
shaft.
Engage
the
3rd
and
4th
speed
fork
shaft
(99),
fit
the
locking
rocker
(80),
fit
the
fork
(100)
on the
shaft
and
put
the
control
lever
(95)
in
position
in
the
groove
on
the
shaft.
Tighten
the
screw
fixing
the
fork.
With
the
shafts
(96)
and
(99)
in
the
"neutral"
position
push
the
reverse
gear
shaft
(101)
towards
the
rear
of the
cover.
Engage
the
fork
(102)
on
the
shaft
and
put
the
lever
(94)
in
position
in
the
groove
on
the
shaft.
Tighten
the
screws
fixing
the
forks
(97)
and
(102).
Lock
the
screws
with
iron
wire,
fitted
in
such
a way,
to
avoid
any
rotation
in
the
direction
of
unscrewing.
Fit
the
locking
balls
(74),
the
springs
(73)
and
the
screws
(72)
(copper
joint
under
the
head)
. . . . . . . . . . . . . . .
Fit
the
distance
piece
(78)
and
the
shim
(77)
on
the
portion
(A)
of
the
mandrel
1793-T
(see
P1.56,
fig.
1).
Fit
the
ring
seal
(71)
on
the
support
tube
(70).
Fit
the
portion
(B)
of'the
mandrel
1793-T
in
the
support
tube
(see
P1.56,
fig.2).
Put
the
18 balls
(103)
in,the
tube,
hold
them
in
position
with
grease.
The
shafts
of the
forks
being
in
the
neutral
position,
engage
the
assembly
of the
mandrel
(B)
and
tube
(70)
in the
cover
of
the
gearbox.
Then
push
on
the
mandrel
(A)
with
the
tube(70)
(see
Pl.
56,
fig.
3).
Fit
the
circlip
(69)
in
the
groove
of the
tube
(70)
between
the
distance
piece
(78)
and
the
shim
(77).
Check
the
calibration
of
the
spring
(68):
under
a load
of
29
f
1.5
kg.
the
length
should
be
52 mm.
(Fixture
for
calibrating
springs
2420-T,
see
Pl.
6,
fig.
1)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fit
the
spring
(68)
and
the
cup
(67)
on
the
locking
spindle
(66)
(spring
compressor
1792-T,
see
P1.57,
fig.4).
. . .
Engage
the
locking
spindle
in
the
support
tube
(70)
and
with
the
latter
push
out
the
mandrel
(B)
(see
Pl.
56,
fig.
4).
Fit
the
circlip
(65)
retaining
the
locking
spindle.
Fit
the
sealing
plug
(83)
with
"Hermetic".
TOOLS
Mandrel
1793-T
9 mm
spanner
17 mm
spanner
and
box
spanner
Mandrel
1793-T
Fixture
for
calibrating
springs
2420-T
Spring
compressor
1792-T
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