Iveco Stralis AT/AD. Manual

39679

39681

39680

39682

39683

Figure 68

Figure 69

Figure 70

Figure 71

Figure 72

Loosen and extract the screws (1) fixing the ring bevel gear
(3) and cover (2) to the half-housing (4).

Counter-mark the cover and gear housing (

⇒ ⇐).

Remove the gear housing cover (1) and release the ring bevel
gear (2).

Remove the crown wheel (2), together with the shoulder
washer (3), from the gear housing (1).

Using a punch, first extract the long pin (4) and then the two
short pins (3).

Remove the spider (2) and the four side pinions (1) with the
relative shoulder washers.
Remove the crown wheel and the shoulder washer.

Remove the fixing nut and the drive coupling flange (1).
If flange extraction proves difficult, use a universal extractor.

The exact position of the pins is marked on the spider
body (2) by a long stripe for the long pin, and by two
short stripes for the short pins.

Removing the bevel pinion from the support

REAR AXLE 451391

TRALIS

AT/AD

Base - January 2003

39684

39686

39685

39687

39688

39689

Figure 73

Figure 74

Figure 75

Figure 76

Figure 77

Figure 78

Remove the bevel pinion (1), intermediate bearing and
adjusting rings from the support. This operation should be
carried out under a press; if not, use an extractor (2).

Remove the bearing adjustment ring (2) from the bevel pinion
(1).

Using universal extractor 99348001 (1), extract the
intermediate taper roller bearing (3) from the bevel pinion (2).

Extract the pinion position adjusting ring (2) from the bevel
pinion (1).

Extract the rear straight roller bearing internal ring (2) from the
bevel pinion (1). This is a destructive operation.

Using a punch, extract the external rings (3 and 2) for the front
and intermediate bearings from the support (1).

REAR AXLE 451391

TRALIS

AT/AD

Carefully clean all of the individual differential components.
Lubricate the bearings and make sure that the roller support
cage rotates freely, rotation should be smooth, without
hardening.

CHECKING THE DIFFERENTIAL
COMPONENTS

Carefully clean all the threads to ensure exact
adjustments and precise tightening torque values.

Check that the grooved section on the pinion flange is not
excessively worn. Replace the pinion if necessary.

If either the bevel gear or pinion need to be changed,
both parts must be replaced as they are provided as
coupled spare parts.

REAR AXLE 451391

TRALIS

AT/AD

Base - January 2003

39690

39692

39691

39693

39694

39695

Figure 79

Figure 80

Figure 81

Figure 82

Figure 83

Secure the gear housing (1) in a vice and position the crown
wheel (2) in its seat, together with the shoulder washer (3).

Assemble the four side pinions (1) with the shoulder washers
and insert the spider (2).

Insert the long pin (1) and the two short pins.

Position the crown wheel (2) and shoulder washer (3) on the
side pinion gear unit.
Fit the cover (1) on the gear housing by making the marks
(made during disassembly operations) coincide.

Heat the ring bevel gear (2) to approx. 80ºC, fit in position in
the gear housing (1) and secure with two fixing screws.

Fit the remaining screws (2) and tighten with a torque wrench
(1) to 300

± 10 Nm (30 ± 1).

First insert the long (through) pin. The exact position
of the pins is marked on the spider body by a long
stripe for the long pin, and by two short stripes for the
short pins.

Figure 84

REAR AXLE 451391

TRALIS

AT/AD

Gear housing assembly

Content .. 157 158 159 160 ..

Iveco Stralis AT/AD. Manual - part 159