043
STRUCTURE AND CHASSIS
Torque
The best way to measure torque applied to wheel nuts is to use a torque wrench.
Wheel nuts and bolts must always be tightened at the correct torque.
Otherwise, wheels may come off the axle if the nuts loosen or the stud
bolt breaks. Always use bolts and nuts with the same conical angle as
the rim holes (normally between 60° and 90°). Follow these steps to
tighten the wheel nuts.
Do not tow the trailer with missing nuts, defective wheel bolts, or wheels
incompatible withthe manufacturer. Under- or over-tightening of wheel
bolts may cause the wheel to separate from the axleand result in
physical damage, serious injury, or even death.
WARNING
1. Start tightening the nuts and bolts by hand to avoid cross-threading.
2. Tighten them in the order shown below:
3. Torque tightening is done in stages. Following the order indicated
above, tighten the bolts progressively until your have reached the
required torque, as shown in point 4.
4. You must tighten the wheels with the correct torque each time you
place a wheel on an axle. Check the wheel nut torque after 15, 40
and 80 km on the road, and periodically after that.
Wheel torque setting parameters
1
1 1 1
2
2
2 2
3
3
3
3
4
4
4
4
5
5
5
6
6
7
8
Wheel diameter
12’’
13’’
14’’
15’’
16’’
20 - 25
20 - 25
20 - 25
20 - 25
20 - 25
35 - 40
35 - 40
50 - 60
50 - 60
50 - 60
50 - 75
50 - 75
90 - 120
90 - 120
90 - 120
Torque tightening stages
1
st
stage 2
nd
stage 3
rd
stage
4
studs
5
studs
6
studs
8
studs
43
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