F-250 Light Duty (1999 year). Manual — part 31

Removing key from ignition
• Turn the ignition key until it

stops.

• Push the release lever forward

and rotate the key towards you
and remove.

POWER TAKE OFF (PTO) CAPABILITY (IF EQUIPPED)

Some vehicles with 6.8L and 7.3L engines are equipped with Power Take
Off (PTO) capability. These vehicles have a special transmission case,
internal components and calibration for PTO usage. If your vehicle is
equipped with a 7.3L Diesel engine, refer to the 7.3L Diesel Supplement
for information on the auxiliary powertrain control module (APCM) and
its operation.

The PTO can be used during mobile and stationary
continuous/intermittent applications.

PTO operation is disabled while the vehicle is in Overdrive (the TCIL will
not be illuminated), in N (Neutral), during engine cranking. Transmission
upshift and downshift schedules will be reduced by about 15% and will
have a firmer shift feel during PTO mobile applications.

The PTO cannot be disabled while the transmission is in Manual 3
(Overdrive position with Overdrive canceled), Manual 2, Manual 1.

Refer to the “Body Builder’s Layout Book” for recommended electrical
installation.

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124

FOUR-WHEEL DRIVE (4WD) OPERATION (IF EQUIPPED)

When Four–wheel drive (4WD) is engaged, power is supplied to all four
wheels through a transfer case. 4WD power can be selected when
additional driving power is desired.

If equipped with the Electronic Shift 4WD System, and the
instrument panel control is moved to 4WD Low while the vehicle
is moving, the system will not engage and no damage will occur to
the 4WD system.

All utility-type vehicles and 4WD vehicles have special design and
equipment features to make them capable of performing in a wide
variety of off-road applications. Specific design characteristics give them
higher centers of gravity than ordinary passenger cars.

Utility and four-wheel drive vehicles are not designed for
cornering at speeds as high as passenger cars any more than

low-slung sports cars are designed to perform satisfactorily under
off-road conditions. Avoid sharp turns or abrupt maneuvers in these
vehicles.

4WD operation is not recommended on dry pavement. Doing so could
result in difficult disengagement of the transfer case, increased tire wear
and decreased fuel economy.

Electronic shift on the fly (ESOF) 4x4 system (if equipped)

The 4WD system:
• provides 4x4 High engagement and disengagement while the vehicle is

moving.

• is operated by a rotary control located on the instrument panel that

allows you select 2WD, 4x4 High or 4x4 Low operation.

• uses hub locks that can be engaged and disengaged automatically by

using a rotary control located on the instrument panel.

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125

• automatic hub locks can be

manually overridden by rotating
the hub lock control from AUTO
to LOCK.

Manual 4x4 system (if equipped)

The 4WD system is engaged or
disengaged by rotating the front
wheel hub lock control from FREE
to LOCK, then manually engaging
the transfer case with a
floor-mounted shifter.

4WD system indicator lights

The 4WD system indicator lights illuminate only under the following
conditions. If these lights illuminate during normal driving, have your
vehicle serviced.
• 4x4 -illuminates when the

ignition is turned on and when
4H (4x4 High) is selected.

• LOW RANGE –illuminates when

the ignition is turned on or when
4L (4x4 Low) is selected.

Using a manual 4WD system (if equipped)

2H (2WD High) – Power to rear axle only.

4H (4WD High) – Power to front and rear axles.

N (Neutral) – No power to either axle.

4L (4WD Low) – Power to front and rear axles at reduced speed.

4x4

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126

Shifting from 2H (2WD high) to 4H (4WD high)

Engage the locking hubs by rotating
the hub lock control from FREE to
LOCK, then move the transfer case
lever from 2H (2WD High) to 4H
(4WD High).

Do not shift into 4H (4WD High)
with the rear wheels slipping.

Shifting from 4H (4WD high) to 2H (2WD high)

Move the transfer case lever to 2H
(2WD High) at a stop or any
forward speed up to 88 km/h (55
mph).

With the vehicle at complete stop,
disengage the locking hubs
(optional) by rotating the hub lock
control from LOCK to FREE.

Shifting from 4H (4WD high) to 4L (4WD low)

1. Bring the vehicle to a complete stop.

2. Depress the brake.

3. Place the gearshift lever in N (Neutral) (automatic transmission) or
depress the clutch (manual transmission).

2H
4H

4L

N

2H
4H

4L

N

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