FORD 2012 F-550 v.3 - Manual (Page 172)

WARNING: Safety belts and seats can become hot in a vehicle
that has been closed up in sunny weather; they could burn a
small child. Check seat covers and buckles before you place a child
anywhere near them.
WARNING: Front and rear seat occupants, including pregnant
women, should wear safety belts for optimum protection in an
accident.
Combination lap and shoulder belts
1. Insert the belt tongue into the
proper buckle (the buckle closest to
the direction the tongue is coming
from) until you hear a snap and feel
it latch. Make sure the tongue is
securely fastened in the buckle.
2. To unfasten, push the release
button and remove the tongue from
the buckle.
Safety belt with cinch tongue (front and rear center seat only)
The cinch tongue will slide up and down the belt webbing when the belt
is stowed or while putting safety belts on. When the lap/shoulder safety
belt is buckled, the cinch tongue will allow the lap portion to be
shortened, but pinches the webbing to keep the lap portion from getting
longer. The cinch tongue is designed to slip during a crash, so always
wear the shoulder belt properly and don’t allow any slack in either the
lap or shoulder portions.
Seating and Safety Restraints
172
2012 F-250/350/450/550 (f23)
Owners Guide, 3rd Printing
USA (fus)