FORD 2013 F-550 v.1 - Manual (Page 372)

Tire Change Procedure
WARNING: When one of the front wheels is off the ground, the
transmission alone will not prevent the vehicle from moving or
slipping off the jack, even if the transmission selector lever is in
position P.
WARNING: To help prevent the vehicle from moving when you
change a tire, be sure to place the transmission selector lever in
position P, set the parking brake and block (in both directions) the
wheel that is diagonally opposite (other side and end of the vehicle) to
the tire being changed.
WARNING: Never get underneath a vehicle that is supported
only by a jack. 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.
WARNING: Always use the jack provided as original equipment
with your vehicle. If using a jack other than the one provided as
original equipment with your vehicle, make sure the jack capacity is
adequate for the vehicle weight, including any vehicle cargo or
modifications.
Note: Passengers should not remain in the vehicle when the vehicle is
being jacked.
Wheels and Tires 371
2013 F-250/350/450/550 (f23)
Owners Guide gf, 1st Printing
USA (fus)