Volvo FM Handbook page 150

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Driving 139
on the instrument panel will come
on.
J4017790
Second position, differential lock in
transfer gearbox and rear axles
engaged. The axle differential lamp
flashes and the lamp for the transfer
gear comes on.
Note!
The differential lock is not engaged
until the warning lamp on the
instrument panel flashes. The
differential lock is engaged as long
as the warning lamp is flashing,
even if the switch is turned off.
Note!
For long driving sessions with the
differential lock between the axles
engaged, make sure to drive a few
hundred metres with the differential
lock disengaged now and again.

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