Volvo FM Handbook page 175

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164 Driving
Set the bogie switch to the lower position.
The load is distributed so that the drive axle carries a
heavier load than previously. The bogie lamp is lit.
To return to normal driving:
1
Put the bogie switch in the centre position
2
Disengage the diff lock
Unloading the front axle
On the front axle bellows there is a sensor that
measures the load on the front axle. When the load
becomes excessive, the front axle is automatically
relieved by lowering the bogie. With excessive front
axle loading and if the speed exceeds 30 km/h, the
system automatically reverts to, firstly, "traction help",
secondly, "optimize traction" and finally normal axle
load distribution. If the load on the front axle is too
high, the bogie cannot be raised.
J7008415
J7008420

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