Ford 2014 F-550 v.2 Manuel d'utilisateur télécharger pdf (Page 157)

Four-wheel drive (when you select a 4WD

mode) uses all four wheels to power the

vehicle. This increases traction, enabling

you to drive over terrain and road

conditions that a conventional two-wheel

drive vehicle cannot.

Basic Operating Principles

• Drive slower in strong crosswinds which

can affect the normal steering

characteristics of your vehicle.

• When driving your vehicle on surfaces

made slippery by loose sand, water,

gravel, snow or ice proceed with care.

• Do not use Four-wheel drive on dry,

hard surfaced roads. Doing so will

produce excessive noise, increase tire

wear and may damage drive

components. Four-wheel drive modes

are only intended for consistently

slippery or loose surfaces.

If Your Vehicle leaves the Road

If your vehicle leaves the road, reduce your

vehicle speed and avoid severe braking.

When your vehicle speed has been reduced

ease your vehicle back onto the road. Do

not turn the steering wheel sharply while

returning your vehicle to the road.

It may be safer to stay on the shoulder of

the road and slow down gradually before

returning to the road. You may lose control

if you do not slow down or if you turn the

steering wheel too sharply or abruptly.

It may be less risky to strike small objects,

such as freeway reflectors, with minor

damage to your vehicle rather than

attempt a sudden return to the road which

could cause your vehicle to slide sideways

out of control or roll over. Remember, your

safety and the safety of others should be

your primary concern.

Emergency Maneuvers

In an unavoidable emergency situation

where a sudden sharp turn must be made,

remember to avoid over-driving your

vehicle (i.e. turn the steering wheel only as

rapidly and as far as required to avoid the

emergency). Excessive steering can result

in loss of vehicle control. Apply smooth

pressure to the accelerator pedal or brake

pedal when changes in vehicle speed are

required. Avoid abrupt steering,

acceleration and braking. This could result

in an increased risk of vehicle roll over, loss

of vehicle control and personal injury. Use

all available road surface to bring your

vehicle to a safe direction of travel.

In the event of an emergency stop, avoid

skidding the tires and do not attempt any

sharp steering wheel movements.

If your vehicle goes from one type of

surface to another (i.e. from concrete to

gravel) there will be a change in the way

your vehicle responds to a maneuver (i.e.

steering, acceleration or braking).

Sand

When driving over sand, try to keep all four

wheels on the most solid area of the trail.

Avoid reducing the tire pressures but shift

to a lower gear and drive steadily through

the terrain. Apply the accelerator slowly

and avoid excessive wheel slip.

When driving at slow speeds in deep sand

under high outside temperatures, use a low

gear when possible. Low gear operation

will maximize the engine and transmission

cooling capability.

Avoid driving at excessive speeds, this

causes vehicle momentum to work against

you and your vehicle could become stuck

to the point that assistance may be

required from another vehicle. Remember,

you may be able to back out the way you

came if you proceed with caution.

154

Super Duty (TFA)

Four-Wheel Drive (If Equipped)

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