2015 FORD F750 air suspension

Transmission 122
Transmission operation.................................126
Brakes 138
Brakes.............................................138
Hints on driving with anti-lock brakes......................142
Traction Control 155
TractionControl™ ....................................155
Cruise Control 157
Driving Aids 159
Steering............................................161
Air suspension.......................................162
Upfitter controls......................................164
Load Carrying 165
Vehicle loading.......................................166
Towing 167
Trailertowing........................................167
Wrecker towing......................................171
Driving Hints 175
Economical driving....................................175
Roadside Emergencies 177
Getting roadside assistance..............................177
Hazard flasher control..................................178
Jump-starting the vehicle...............................178
Customer Assistance 182
Getting assistance outside the U.S. and Canada...............184
Reporting safety defects (U.S. only).......................186
Reporting safety defects (Canada only).....................186
Table of Contents3
2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
Canadian_French(fr_can)

VEHICLE INSPECTION INFORMATION
To make sure your vehicle is ready to operate, conduct a pre-trip
inspection at the beginning of each work period. Follow the steps listed
in this section to verify a proper vehicle inspection procedure.
WARNING:Exercise great caution when working on a vehicle
equipped with an automatic fan clutch. The fan starts in motion
only after the engine coolant reaches a predetermined temperature or
the refrigerant pressure (if equipped with air conditioning) reaches a
predetermined setting. The fan starts at this point with no advance
warning. Never reach near, or permit objects to protrude into, the fan
blade radius while the engine is running as this could result in vehicle
damage, personal injury or death.
WARNING:Do not operate the vehicle if any suspension
conditions listed in the following charts are evident. Loss of
steering or suspension could result in property damage, personal injury
or death.
WARNING:If a wheel must be changed, obtain expert tire
service help. Mounting and un-mounting of tires should only be
performed by a qualified technician using necessary safety procedures
and equipment, otherwise the result could be property damage,
personal injury or death.
Note:Always make sure you apply the parking brake before starting the
engine.
Vehicle Inspection Guide13
2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
Canadian_French(fr_can)

Rear suspension
Torsion arm and
shock absorbersVerify torsion arm is not cracked, broken or
missing.
Inspect the shock absorber for cracks or leaks.
There should be no missing or broken mounting
bolts or worn bushings.
Rear brakes
Hoses•Inspect for cracked, worn or frayed hoses.
Verify all couplings are secure.
Brake chambersVerify:
•There are no cracks or dents
•They are securely mounted.
Slack adjusterInspect for broken, loose or missing parts.
Note:The angle between the push rod and
adjuster arm should be approximately 90 degrees
when the brakes are applied. When pulled by
hand, the push rod should not move more than
approximately 1 inch (2.5 centimeters).
DrumVerify:
•There are no cracks, dents, holes and no loose
or missing bolts
•The brake linings are not worn, dangerously
thin or contaminated by lubricant.
Rear wheels
SpacersVerify:
•Even separation of dual wheels
•The tires are not touching one another.
RimsInspect for damaged or bent rims. Rims should
not have welding repairs, and no rust trails,
which indicate it is loose on the wheel.
Lug nutsVerify all lug nuts are present and not loose (look
for rust trails around the lug nuts). There should
be no cracks radiating from the lug bolt holes or
distortion of the bolt holes.
Vehicle Inspection Guide21
2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
Canadian_French(fr_can)

WARNING:Driving a vehicle with the brake system warning
light on is dangerous. A significant decrease in braking
performance may occur. It takes you longer to stop the vehicle. Have
the vehicle checked by your authorized dealer. Driving extended
distances with the parking brake engaged can cause brake failure and
the risk of personal injury.
Charging System
It illuminates when the 12–volt battery is not charging properly.
Contact an authorized dealer as soon as possible. This indicates
a problem with the electrical system or a related component.
Check Fuel Cap (gasoline engine only)
It illuminates when you may not have installed the fuel cap
properly. Continued driving with this light on may cause the
service engine soon warning indicator to come on.
Check Suspension
It illuminates when you press the air suspension dump switch.
Check Transmission (Allison automatic transmission only)
It illuminates while driving if a transmission problem exists;
shifting may be restricted. Depending on the severity of the
problem, the shifter’s digital read-out may turn blank.
On MD 3000 series transmissions, operation may continue in order to
reach service assistance. The control unit may not respond to shift
selector requests, since there are operating limitations on the
transmission (such as upshift and downshift restrictions). Direction
changes do not occur.
Cruise Control
It illuminates when you switch this feature on.
CK
SUSP
68Instrument Cluster
2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
Canadian_French(fr_can)

If the steering wanders or pulls, check for:
•Underinflated tire(s) on any wheel(s)
•Uneven vehicle loading
•High crown in center of road
•High crosswinds
•Wheels out of alignment
•Loose or worn suspension components.
AIR SUSPENSION (IF EQUIPPED)
Note:Do not operate your vehicle without air in the suspension springs.
Operating your vehicle without air in the suspension springs damages the
suspension, degrades ride performance and may cause property damage.
The air suspension system automatically adjusts to different loads to
maintain a constant frame height, allows for ease of vehicle loading,
provides improved vehicle ride, and increased driver comfort.
Air Suspension Dump Switch
Note:The suspension dumps air when the ignition is in the accessory or
on position, but fills only when the ignition is in the on position.
A switch located in the overhead
switch pack controls the system. It
operates only when the ignition is in
the accessory or on position and the
air tanks have sufficient pressure to
fill the air springs. When you turn
off the ignition, the suspension
remains in whatever state it was last
set.
Pressing the lower portion of the switch exhausts air from the air
springs, lowering the frame for loading. Pressing the upper portion of the
switch fills the air springs so your vehicle remains at normal ride height.
System Indicator Light
The air suspension indicator light illuminates when using the
switch to release air pressure in the rear air shocks. Never
drive your vehicle when the warning lamp is illuminated and
there is low (or no) air pressure in the shocks.
CK
SUSP
162Driving Aids
2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
Canadian_French(fr_can)

Connecting and Disconnecting a Trailer with Air Suspension and
Air Suspension Dump Switch
When connecting to a trailer:
•Press the lower portion of the switch to exhaust air from the air
suspension system.
•Press the upper portion of the switch, and then raise the landing gear
after making the connection to the trailer.
When disconnecting the trailer:
•Lower the landing gear, and then press the lower portion of the
switch.
•Disconnect the brake hoses, trailer-side and rear light connectors,
then pull the release lever on the fifth wheel.
You must press the upper portion of the switch before operating with a
trailer or operating in the bobtail mode.
Suspension Conversions
WARNING:When operating a loaded vehicle, the driver must
keep all adjustable axles on the ground at all times, supporting
their share of the vehicle’s load. Failure to do so can overload other
axles, tires, wheels, springs, steering components, brakes and frames,
resulting in early component failure, loss of vehicle control, possible
property damage and personal injury.
We do not recommend performing, or approve of, suspension
conversions. However, we understand that, on occasion, others install
aftermarket add-on suspensions on the truck chassis that allow operator
control for weight transfer from other axles (such as air lift axles).
Driving Aids163
2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
Canadian_French(fr_can)

Fuse/Relay
LocationFuse Amp
RatingProtected Circuits
16 15A High beams, Indicator
17 — Not used
18 5A Dimmer switch, Interior lighting
19 15A Engine control (diesel engine only)
20 5A Starting system
21 10A DRL resistor
22 15A Air horn, Air suspension dump, Two-speed
axle, Driver-controlled locking differential
23 10A Flasher relay
24 15A Hydraulic brakes relay, Fuel heater relay
(diesel engine only), Air dryer
25 10A Blower motor relay coil
26 10A Right-hand low beam headlight
27 — Not used
28 10A Left-hand low beam headlight
29 10A Cluster, GEM
30 15A Allison electronic transmission
31 15A Mirror fold relay
Relay 1 — Interior lamps
Relay 2 — Not used
Relay 3 — Horn
Relay 4 — Not used
Relay 5 — Not used
Fuses193
2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
Canadian_French(fr_can)

Perform a complete inspection of the air induction system annually.
In areas where road salt is used, disassemble the joints of each aluminum
component and inspect for salt build-up and presence of chlorine that
can cause aluminum particles to flake off and enter the engine
combustion chambers. If evidence of corrosion is found (usually at the
pipe connections), use a wire brush to clean the inside of the pipes and
inside the rubber hoses.
If pitting is evident at the joint ends of the intake pipes, use Motorcraft
Silicone Gasket and Sealant TA-30 to seal the joints. Make sure no
excess material, which can pull into the engine, is on the inside of the
pipes. If the service condition of the pipes, hoses or clamps is
questionable, replace the defective part(s).
Make sure to clean all dust and debris out of the pipes and couplings
with a clean, damp rag before reassembly.
Chassis-mounted Charge Air Cooler
Visually inspect the core assembly for debris and clogging of external fins
with the engine off. Before engine operation, remove any debris blocking
the core.
•Turbocharger-to-charge air cooler
•Charge air cooler-to-intake manifold pipe
•Mounting bracket
•Chassis-mounted charge air cooler core
Inspect air intake piping:
•Check for accumulation of salt deposits (where applicable). If
present, disassemble and clean the complete air intake piping system.
If pitting is evident on the intake piping, use Motorcraft Silicone
Gasket and Sealant TA-30 to seal joints against leakage.
•Check for loose hoses and clamps.
•Check for ruptured or collapsed hoses.
•Check air cleaner housing for cracks.
Suspension Inspection
Note:Do not adjust air suspension height to any setting other than the
specified setting. Altering the height setting changes the driveline angle
and may result in unwarrantable component damage, such as
transmission component damage.
Verify drive axle air suspension height and height control valve
performance at engine oil change intervals.
206Maintenance
2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
Canadian_French(fr_can)