FORD 2013 F-550 v.2 - Manual (Page 160)

Recline Adjustment
Manual Lumbar (If Equipped)
The lumbar support control is
located on the outboard side of the
seat. Turn the control to adjust your
support.
Seats 159
2013 F-250/350/450/550 (f23)
Owners Guide gf, 2nd Printing, December 2012
USA (fus)