Iveco Stralis AT/AD. Manual

70819

70920

70921

78304

Figure 113

Figure 114

Figure 115

Figure 116

Remove the screw (1), lift the cover (2), remove the vents (3)
and clean them or replace them.

Then reassemble the parts.

Carefully clean the oil filter (6) and fit it back in its seat.

If the plugs (4) have been removed, it is necessary to fit them
back on with new seals (5).

Heat the front box (1) to 90

°C in correspondence with the

seats for the external rings (2 and 3) of the tapered roller
bearings and fit these on.

Spread IVECO sealant 1905685 onto the mating surface of
the middle box (5).

Fit the eyebolt 99368811 (1) onto the front box (2).

Using ropes and a hoist, lift the box (2) and position it coaxially
to the middle box (5).

Insert the rods (6), of suitable diameter, into the seats in the
front box (2) of the oil pipes (7 and 8) and into these too.

Lower the box (2) checking that the rods (3 and 4) and the
oil pipes (7 and 8) are correctly inserted in their seat.

Remove the eyebolt (1) and the guide rods (6).

Screw down the screws (2) fixing the front box (3) to the
middle box (6). Insert the centring pins (1) and tighten the
screws (2) to the prescribed torque.

Mount the cap (4) and the speed sensor (5), tightening it to
the prescribed torque.

GEARBOX EuroTronic 12 AS 2301 D.D./O.D.

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70922

70985

70871

70924

Figure 117

Figure 118

Figure 119

Figure 120

Figure 121

Using the tools 99345098 (1) comprising parts (3-4 and 5) and
99360526 comprising parts (6-7 and 8), fit the ball bearing
(11) on the drive input shaft (9) and in the front box (10).

Fit the circlip (4) fastening the bearing (1) to the drive input
shaft (3).

Fit the circlip (2) onto the bearing (1).

Front cover
Removal

Remove the screws (3) and take off the drive input shaft cover
(1) from the front cover (2).

Take out the screws (1) and, through the front cover (5), take
out the oil pump comprising: cover (2), rotor (3) and stator
(4).

Introduce compressed air through the hole (

→) and expel

through the front cover (5): the overrun brake piston (8)
comprehensive of gasket (9), clutch plates with external
toothing (6), clutch plates with internal toothing (7) and
supporting ring (10).

Fitting the front cover

Recompose the front cover (5) by reversing the operations
described for removal, without parts (6 - 7 - 8).

Adjusting drive input shaft bearing end float

Determine the thickness S of the drive input shaft bearing
adjustment ring by proceeding in the following way:

- check that the circlip (1) of the bearing (2) rests in its seat;

- measure the protrusion of the bearing (2) from the

surface of the front box (3), distance A.

The gasket (9) must always be replaced.

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GEARBOX EuroTronic 12 AS 2301 D.D./O.D.

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AT/AD

Base - January 2003

70986

70925

70870

Figure 122

Figure 123

Figure 124

Figure 125

- measure the depth of the seat on the front cover (1) of

the bearing (2, Figure 121), distance B.

The thickness S of the adjustment ring is determined by the
following equation:

S = (A -B) - C

Where:

A-B =

measurements

end float 0

÷ 0.1 mm

For example:

5.50 mm

3.90 mm

÷ 0.1 mm

(5.50 -3.90) - 0

÷ 0.1=1.59 — 1.60 mm

Adjusting transmission shaft bearing end float

Determine the thickness S of the transmission shaft bearing
end float adjustment rings by proceeding in the following way:
- turn the shafts and check that the external rings (1 -3) of

the bearings rest with no play on the rollers of the
bearings;

- measure the distance between the surface of the front

box (2) and the external rings (1 - 3);

external ring (1) pump side, distance A.

external ring (3) overrun brake side, distance B

- measure the distance between the surface of the front

cover (2) and the oil pump (1), distance C;

- mount the overrun brake disc supporting ring (3) in the

seat on the front cover (2) and measure the distance
between this and the surface of the cover (2), distance D.

The thickness S of the adjustment rings is determined by the
following equation:
D

oil pump side

S = A + C + F

A - C

= measurements

end float

± 0.05

For example:
S

= 2 + 0.05 (

± 0.05) = 2 ÷ 2.1

overrun brake side S = B + D + F

B - C

= measurements

end float

± 0.05

For example:
S = 1.95 + 0.15 (

± 0.05) = 2.05 ÷ 2.15

On the external rings of the bearings supporting the drive
input and transmission shafts, mount the end float adjustment
rings (1 - 2 and 6) of the thickness determined in the preceding
measurements. Insert the spring (4) and the cap (3) in the
transmission shaft (5).

70926

GEARBOX EuroTronic 12 AS 2301 D.D./O.D.

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Iveco Stralis AT/AD. Manual - part 104