Volvo FM Handbook page 191

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180 Driving
3
Apply the parking brake
4
Engage the PTO in the powertrain
5
Wait until HS is shown on the display (High
range lock-up Standby)
6
Move the gear lever to position A (or M)
7
Wait until HR is shown on the display (High
range lock-up Running)
8
Increase engine speed to the desired rpm.
9
The C will disappear when the engine speed is
increased (the rpm depends on whether the gear
lever is in A or M)
Disengage the powertrain PTO temporarily
1
Move the gear lever to N
2
HS is shown on the display (High range lock-up
Standby)
3
Re-engage by moving the gear lever to position
A or M
Disengage
1
Lower the engine speed to idling
2
Move the gear lever to N
3
Apply the parking brake
4
Disengage the PTO
5
HD is shown on the display (High range lock-up
Disengaging)
6
Wait until HD is no longer shown on the display
7
It is now possible to drive off with the vehicle. If
HD remains on the display, it may be due to the
parking brake not being applied.
Incorrect usage
If engaging or disengaging is not carried out correctly,
HD (High range lock-up Disengaged) will be shown
on the display. The gearbox will select neutral. Try
one of the following measures:

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