FORD 2012 F-550 v.1 - Manual (Page 174)

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.
Before you can reach and latch a combination lap and shoulder belt
(with a cinch tongue) into the buckle, you may have to lengthen the lap
belt portion of it.
Seating and Safety Restraints
174
2012 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)