Iveco EuroCargo (12 to 26 t). Manual — part 124
73842
Figure 2
SECTION OF FRONT AXLE 5851/5 (F 5521) WHEEL SIDE
E
URO
C
ARGO
T
ECTOR
12-26 t
40
FRONT AXLES 5842/5 - 5851/5
Base - February 2003
The upright angle (
β) of inclination is the one resulting from
the axis passing through the upright and the vertical to the
ground, looking at the vehicle standing before it.
When the extension of the upright axis approaches the wheel
when it is touching the ground (opposite direction compared
to the wheel’s inclination), the angle is positive. It is difficult, if
not impossible, to have a negative upright angle of inclination.
The wheel angle (
α) of inclination and the upright angle (β)
of inclination enable the wheel axis and the upright axis to get
closer to the tyre’s fulcrum on the ground as much as possible.
As a result, it is possible to reduce the tyre wear and to get
a low value of the steering torque.
In order to have a good roadholding, a low tyre wear and to
enable driving wheels to recover an upright direction after
steering, it is necessary to set the wheels according to certain
assembly angles:
- wheel angle of inclination
- upright angle of inclination
- clearance angle
- toe-in
Such angles, when correctly calculated, enable the vehicle to
maintain the right balance among the various forces involved
in its movement, in different loading conditions, which tend to
alter the wheel position on the ground.
Figure 3
Clearance angle
Wheel angle of inclination
The wheel angle (
α) of inclination is the one resulting from the
axis passing through the wheel’s centre line and the vertical to
the ground, looking at the vehicle standing before it.
The inclination is positive (A) when the wheel’s upper part
moves outside. It is negative (B) when the wheel’s upper part
moves inside.
32956
32957
32958
Figure 4
Figure 5
A
B
α
α
ß
The clearance angle (
γ) is the one resulting from the upright
axis and the vertical to the ground, looking at the vehicle from
one side.
If the extension of the upright axis falls beyond the wheel’s ful-
crum on the ground in the vehicle’s direction, as a rule the
clearance angle is positive (A). It is considered negative (B) if
it falls behind the wheel’s fulcrum on the ground. It is null if it
is absolutely perpendicular to the wheel’s fulcrum on the
ground.
Such an angle enables front wheels to keep an upright position
when the vehicle is moving in an upright direction and to re-
cover such a position after taking a curve as soon as the steer-
ing wheel is released by the driver.
A
B
+
_
γ
γ
Upright angle of inclination
E
URO
C
ARGO
T
ECTOR
12-26 t
FRONT AXLES 5842/5 - 5851/5
41
Base - February 2003
32359
32960
32961
Figure 6
Figure 7
Figure 8
Toe-in is negative if B is lower than A.
Toe-in is zero if B corresponds to A.
A
B
A
B
A
B
Toe-in results from the difference between distance A and
B (value expressed in mm) measured on the rims’ horizontal
axis, looking at the vehicle from above.
In this way it is possible to drive easily and to reduce the tyre
wear.
Toe-in is positive if B is bigger than A.
Toe-in
E
URO
C
ARGO
T
ECTOR
12-26 t
42
FRONT AXLES 5842/5 - 5851/5
Base - February 2003
E
URO
C
ARGO
T
ECTOR
12-26 t
FRONT AXLES 5842/5 - 5851/5
43
Base - February 2003
Axle type
5842/5 (F 5021)
5851/5 (F 5521)
STEERING KNUCKLE PINS
α
Inclination of steering knuckle pin
housing
7
° ± 3’
∅ 1
2
∅
Diameter of roller bearing housing
in steering knuckle:
- upper housing
∅ 1
- lower housing
∅ 2
mm
41.972 to 41.988
mm
51.967 to 51.986
∅ 3
4
∅
Outside diameter of roller bear-
ings for steering knuckle:
- upper bearings
∅ 3
- lower bearings
∅ 4
mm
42
mm
52
Upper bearings — steering knuckle
mm
0.012 to 0.028
Lower bearings - steering knuckle
mm
0.014 to 0.033
∅ 5
6
∅
Inside diameter of roller bearings
for steering knuckle:
- upper bearings
∅ 5
- lower bearings
∅ 6
mm
35
mm
43
∅ 7
8
∅
Diameter of pin for steering
knuckle
- upper
∅ 7
- lower
∅ 8
mm
34.984 to 35.000
mm
42.984 to 43.000
Upper bearings — pin
mm
0 to 0.016
Lower bearings — pin
mm
0 to 0.016
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