FORD 2011 F-550 v.4 - Manual (Page 298)

• auto-manual hub locks can be
manually overridden by rotating
the hub lock control from AUTO
to LOCK if desired.
• automatic operation of the
hub locks is recommended, and
will increase fuel economy
• For proper operation, make
sure that each hub is fully
engaged and that both hub
locks are set to the same position (both set to LOCK or both
set to AUTO). To engage LOCK, turn the hub locks completely
clockwise; to engage AUTO, turn the hub locks completely
counterclockwise.
4WD system indicator lights
The indicator lights illuminate in the message center in the
reconfigurable telltale (RTT) under the following conditions. Refer to
Warning lights and chimes in the Instrument Cluster chapter.
• 4X2 - Momentarily illuminates
when 2H is selected on electronic
shift 4WD systems only.
• 4X4 HIGH - Illuminates when 4H
(4x4 High) is engaged.
• 4X4 LOW - Illuminates when 4L
(4x4 Low) is engaged.
• CHECK 4X4 – Displays when a
4x4 system fault is present
Using a Manual Shift On Stop (MSOS) 4x4 system (if equipped)
Note: High shift efforts may be encountered when attempting to
shift into and out of 4x4 modes. It is recommended to allow the
vehicle to roll at a speed below 3 mph (5 km/h) when shifting
between modes.
Note: Some noise may be heard as the 4x4 system shifts or engages.
This is normal. In order to reduce engagement noise, it is recommended
that all shifts be performed at speeds below 3 mph (5 km/h).
4x2
4x4
HIGH
4x4
LOW
Driving
298
2011 F-250/350/450/550 (f23)
Owners Guide, 4th Printing
USA (fus)