Iveco Stralis AT/AD. Manual — part 228
S
TRALIS
AT/AD
2
WHEELS AND TYRES
Base - January 2003
The wheel rim represents the rigid structure of the wheel and
is identified by the following dimensions:
- diameter of the rim, measured at the base of the
circumferential groove (that is, on the surface on which
the air chamber rests);
- width of the circumferential groove in the wheel rim (that
is, the distance between the surfaces on which the cover
rests);
The tyre has the following functions:
- to absorb the greater part of the jolts caused by
roughness of the road surface by exploiting the elasticity
of air;
CHARACTERISTICS AND DATA
- to generate on the ground the motive force supplied by
the engine necessary for the vehicle to move;
- to ensure the maximum grip and stability of contact
between the tyre and the road, with satisfactory life;
- to withstand the forces generated by sudden braking,
hard acceleration and by the thrust of centrifugal force on
bends;
- to ensure the stability of the vehicle even at high speeds;
to ensure the steerability of the vehicle.
!
When checking tyre pressures, adhere to the values
given in the booklet ”Use and Maintenance”.
WHEELS AND TYRES
3
S
TRALIS
AT/AD
DESCRIPTION
WHEELS
Disc type, with specific continuous rims.
22.5” x 8.25
22.5” x 9
22.5 x 11.75
20 x 8.5
Tyre inflation pressures
Sudden variations in speed, violent or harsh braking
Excessive speed with tyre pressures too low
99305037
Electronic unit for balancing the front wheels on the vehicle
Main tyre faults :
1
-
Excessive wear
2
-
Irregular wear
3
-
Vehicle pulls to one side
TOOL
DESCRIPTION
TOOLS
Excessive speed on particularly uneven ground
Reduce speed
Avoid all unnecessary acceleration or braking
Check tyre pressures cold
Tyre pressures too high
Reduce pressures
Truck overloaded
Consult data on loads permitted
YES
1
NO
EXCESSIVE WEAR
YES
NO
YES
NO
YES
NO
YES
S
TRALIS
AT/AD
4
WHEELS AND TYRES
Base - January 2003
Distortion of wheel rims causing imbalance
Difference in tyre pressures between one pair of
wheels and the other
Check pressure
Tyre pressures too low; wear more accentuated on the
outside surfaces of the tread than in the middle
Increase tyre pressures
Tyre pressures too high, with excessive wear in the
middle of the tread
Reduce pressure
Insufficient toe-in of front wheels; substantial wear on
the inside surfaces of the tread
Check and adjust toe-in
Front wheel geometry incorrect
Restore normal wheel geometry
If possible, repair the rims or replace; then balance the
wheels
Tyres incorrectly fitted to rims
Fit the tyre correctly and balance the wheel
(continued)
YES
2
NO
IRREGULAR WEAR
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
WHEELS AND TYRES
5
S
TRALIS
AT/AD
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