Iveco Daily. Manual — part 253
92
REAR AXLES 450310
D
AILY
Revi - February 2005
Figure 1
DESCRIPTION
The rear axle is the load-bearing type with a single reduction
using a hypoid crown wheel and pinion.
The axle housing is made of pressed sheet steel with hot
pressed arms.
The central portion, seat of the differential unit, is equipped
with cooling fins.
The bevel pinion is supported by two pre-lapped tapered
roller bearings to hold the bearing pre-load better.
The rolling torque of the bearings of the bevel pinion is
adjusted by changing the thickness of the adjustment ring
between the two tapered roller bearings.
In addition, it is possible to adjust the position of the bevel
pinion with respect to the ring bevel gear by changing the
thickness of the ring between the axle housing and the bevel
pinion rear bearing external ring.
The gear housing is supported by two tapered roller bearings.
The rolling torque of the bearings is adjusted with adjustment
rings between the spacer rings and the external rings of the
bearings.
The clearance between pinion and crown wheel is adjusted
by changing the thickness and/or position of the adjustment
rings, though the total thickness must be the same as that of
the adjustment rings removed.
The gear housing is composed of two half-housings.
It may be of two different sizes depending on the ratio of the
crown wheel and pinion.
The gearing of the differential is composed of two planetary
gears and two crown wheels.
The wheel hubs are keyed, with UNIT BEARINGS lubricated
for life, onto the arms of the axle housing.
The bearings need no adjustment.
The brakes are disc brakes with floating brake calipers.
The disc brakes are keyed onto the wheel hubs.
The brake calipers are secured with flanges fixed onto the
arms of the axle housing.
The parking brake is the drum type, built into the brake disc.
102133
REAR AXLES 450310
93
D
AILY
Revi - February 2005
94
REAR AXLES 450310
D
AILY
Revi - February 2005
Type of rear axle:
450310
Simple reduction type with mech-
anical control differential locking
450310
DIFFERENTIAL UNIT
Reduction bevel gear pair ratio
(No. of teeth: pinion/crown)
12/45 (1/3.75) - 12/47 (1/3.92)
Bevel pinion bearings
2 with taper rollers
Bevel pinion bearings rolling torque
(without seal ring)
daNm
0.23
÷ 0.33
kgm
0.23
÷ 0.33
Adjustment of pre-load of bevel
pinion bearings
By means of adjustment rings
>
Bevel pinion bearings pre-load ad-
justment rings
5.175
÷ 6.150 mm
with progression of 0.025 mm.
Temperature at assembly of inner
bearing ring on bevel pinion
-
Position of bevel pinion with re-
spect to differential casing
By means of adjustment spacers
>
Thickness
of
adjustment
rings
placed between bevel pinion and
differential casing
3.2
÷ 4.1 mm
with progression of 0.025 mm.
Bearings for gear housing
2 with taper rollers
Differential casing bearings rolling
torque
daNm
0.271
÷ 0.39
kgm
0.271
÷ 0.39
Adjustment of differential casing
bearings rolling torque
By means of adjustment rings
>
Thickness of adjustment rings of dif-
ferential casing bearings rolling
torque
4.075
÷ 4.850 mm
with progression of 0.05 mm.
Clearance between pinion and ring
bevel gear
0.13
÷ 0.18
REAR AXLES 450310
95
D
AILY
Revi - February 2005
450310
Simple reduction type
450310
Adjustment of clearance between
pinion and ring bevel gear
By means of adjustment rings
Clearance between planetary and
crown wheels
0.12
÷ 0.18 mm
WHEEL HUBS
Wheel hub bearings
UNIT-BEARING
Wheel hub bearings end play
-
Wheel hub bearings rolling torque
Nm
kgm
--
--
Adjustment of wheel hub bearings
end play
By means of nut
Torquing the securing nut
Rear axle oil
Quantity
Litres
TUTELA W90/M-DA (SAE 80 W 90)
1,85
Max capacity (GAW) kg
2600
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