FORD 2011 F-550 v.4 - Manual (Page 154)

To remove the non-adjustable head restraint, do the following:
Simultaneously press and hold both
unlock/remove buttons, then pull up
on the head restraint.
To reinstall the non-adjustable head restraint, do the following:
1. Insert the two stems into the
guide sleeve collars.
2. Push the head restraint down
until it locks.
WARNING: The non-adjustable head restraint is a safety device.
It should be installed whenever the seat is occupied.
WARNING: To minimize the risk of neck injury in the event of a
crash, head restraints must be installed properly.
Seating and Safety Restraints
154
2011 F-250/350/450/550 (f23)
Owners Guide, 4th Printing
USA (fus)