Iveco EuroCargo (12 to 26 t). Manual — part 131
E
URO
C
ARGO
T
ECTOR
12-26 t
68
FRONT AXLE 5871/5
Base - February 2003
CHECKING BALL JOINT END PLAY
FOR TRACK ROD AND DRAG LINK
90
. . . . . .
- Replacing ball joint
90
. . . . . . . . . . . . . . . . . . . . . .
REMOVING AND REFITTING TRACK ROD
ARMS
91
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REMOVING AND REFITTING DRAG LINK ARM
91
REMOVING AND REFITTING THE KINGPIN
91
. . .
- Removing
91
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- Refitting
92
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
- Checking and adjusting play between stub axle
and axle
92
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STEERING KNUCKLE PIN
BEARING REPLACEMENT
93
. . . . . . . . . . . . . . .
CHECKS AND MEASUREMENTS
ON AXLE BODY
94
. . . . . . . . . . . . . . . . . . . . . .
- Checking surface flatness of leaf spring seating
with respect to holes for kingpins.
94
. . . . . . . . . .
- Checking inclination of holes for kingpins
95
. . . .
71175
Figure 1
Front axle 5871/5 has a steel structure with a double “T” section having at the end steering knuckles.
The steering knuckles’ connection is made through pins integral with the axle body and by means of four roller bearings set with
interference in the holes of the steering knuckles’ embossing.
The wheel hubs are supported by two conical roller bearings, “set right” type, set on the steering knuckle shank. The bearing end
play is predetermined by the spacer placed between them.
AXLE SIGHT 5871/5
E
URO
C
ARGO
T
ECTOR
12-26 t
FRONT AXLE 5871/5
69
Base - February 2003
71176
Figure 2
FRONT AXLE PART — ABS SENSOR LOCATION
SECTION OF FRONT AXLE WHEEL SIDE
SEC A-A
SEC B-B
E
URO
C
ARGO
T
ECTOR
12-26 t
70
FRONT AXLE 5871/5
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
fulcrum 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. 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
recover such a position after taking a curve as soon as the
steering wheel is released by the driver.
A
B
+
_
γ
γ
Upright angle of inclination
E
URO
C
ARGO
T
ECTOR
12-26 t
FRONT AXLE 5871/5
71
Base - February 2003
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