FORD 2012 F-550 v.1 - Manual (Page 340)

If equipped with a tether, perform the following additional steps:
6. Lift the spare tire on end to
access the tether attachment.
7. Use the lug wrench to remove the
lug nut from the spare tire tether.
8. If not replacing the spare or flat
tire to the underbody storage area,
raise the wheel retainer up into the
installed position.
9. Use the attached fastener strap
(on the spare tire tether) to attach
the tether end to the winch retainer prior to raising to the installed
position.
Tire change procedure
WARNING: When one of the rear wheels is off the ground, the
transmission alone will not prevent the vehicle from moving or
slipping off the jack, even if the transmission is in P (Park).
WARNING: To prevent the vehicle from moving when you
change a tire, be sure the parking brake is set, then block (in
both directions) the wheel that is diagonally opposite (other side and
end of the vehicle) to the tire being changed.
WARNING: If the vehicle slips off the jack, you or someone else
could be seriously injured.
WARNING: Do not attempt to change a tire on the side of the
vehicle close to moving traffic. Pull far enough off the road to
avoid the danger of being hit when operating the jack or changing the
wheel.
Note: Passengers should not remain in the vehicle when the vehicle is
being jacked.
Roadside Emergencies
340
2012 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)