Iveco Stralis AT/AD. Manual — part 159
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
86
REAR AXLE 451391
S
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
87
S
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.
88
REAR AXLE 451391
S
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
89
S
TRALIS
AT/AD
Gear housing assembly
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