2015 FORD F750 Owners Manual

Rotation may not advisable:
•Front (Steering) Axle:Remove tires when tread wears down to
four–thirty seconds inch (3 millimeters) or less. Retread or rotate
worn tires to drive position. We do not recommend using retreaded
tires on steering axles.
•Rear Axles:Remove tires when tread wears down to two–thirty
seconds inch (2 millimeters).
If using a rib tire on front axle and lug or off-road type on rear axle
positions:
•Front (Steering) Axle:Replace tires at front wheels when tread is
worn to four–thirty seconds inch (3 millimeters) or less.
•Rear Axles:Remove tires when the tread wears down to two–thirty
seconds inch (2 millimeters) or less. Tires identified with the word
re-groovable molded on the sidewall can be re-grooved. There must
be a minimum of three–thirty seconds inch (2.5 millimeters) of
under-tread at the bottom of the grooves.
Wheel and Tire Balancing
Out-of-round or out-of-balance wheels or tires can cause vehicle
vibration, bounce and shimmy. Replace damaged or out-of-round wheels.
You can correct out-of-round tires and wheel assemblies by re-clocking
the tire relative to the wheel.
You should then dynamically balance the tire and wheel assembly.
Tire Wear
Radial tires can exhibit three types of normal wear patterns:
•Even
•Erosion
•Chamfer
Even wear:A sign that the tire is being properly used and maintained.
Erosion wear:Also called rolling wear, channel or river wear, erosion
wear occurs more often on free-rolling tires. This is an indication of
using the tire in a slow wearing operation. What happens is that the belt
plies are held very rigid and the tread is not allowed to distort as it
passes through the contact area. Wear only occurs at the edge of the
tread. No corrective action required. If erosion gets to be one–sixteenth
inch (2 millimeters) or more, you can rotate the tire to a drive axle.
Chamfer or shoulder wear:With tires inflated properly, this is a
normal tendency of most radial tire designs. If both inside and outside
shoulders are wearing evenly around the tire, no further action is
required. Over-inflation is not effective in correcting this effect.
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Irregular Wear:If irregular wear is present, check the axle alignment,
tire pressure, wheel balancing, shock and suspension component
condition, and wheel bearing end play.
This condition not only shortens tire life, but also adversely affects the
handling of your vehicle, which is dangerous.
Rotating tires from one wheel position to another is an often-used way to
even out many types of irregular wear or to avoid it altogether. Some of
the more effective tire rotation programs are:
•You can rotate steer tires that have developed some type of irregular
wear pattern to drive axles if using rib tires on all wheel positions.
Applying steer tires to a drive position often cleans them. You can
move them back to the steer axles or run out to re-tread stage on the
rear axle.
•Another rotation possibility for fleets with rib tires in all wheel
positions is to break in the new steer tires in the drive axle positions,
then move them to steer axles. This wears away tread rubber
relatively quickly in the early life of a tire when it is most likely to
develop an unusual wear pattern.
•You can place drive axle tires on the other end of the same axle to
reverse the direction of rotation. This is often helpful if a heel and
toe or alternate lug wear pattern has developed.
You can help minimize irregular wear by:
•Using the right inflation pressure for the load being carried.
•Maintaining proper front wheel alignment, especially toe-in, to
specifications.
•Maintaining proper tire and wheel balance.
•Maintaining shock absorbers and suspension components.
Use of Tire Chains
See the chain manufacturer’s recommendation for correct tire chain
usage, installation and removal.
WHEELS
General Information
Note:Remember to replace the wheel air valves when replacing the road
tires at the end of their useful lives.
Inspect, lubricate and adjust wheel bearings at regular intervals. This is
especially important if operating in deep sand, mud or water. See the
Capacities and Specificationschapter.
Mount wheel balance weights on the dome-side of the wheel only. Failure
to do so may result in loss of wheel weight or damage to brakes or
wheels.
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Oil-lubricated Front Wheel Bearings
During normal vehicle duty cycle, the lubricant and air inside the
hub/wheel cavity expands and, if not vented, causes pressure build-up
that could cause accelerated seal wear. You can use two venting methods
to prevent pressure build-up:
•A slit or small hole in the rubber check vent
•The window.
Over a period, if not routinely cleaned, a slight film of oil can collect dirt
around the rubber fill plug and face, which could appear to be a leak.
Routine cleaning helps make sure that you can easily observe the
lubricant level through the window as intended. In situations where the
window is clean on the outside but discolored on the inside, you can
check the lubricant level by inserting a finger through the rubber check
vent hole.
The specified lubricant level for a window-type hubcap is from the
minimum line to five–sixteenth inch (8 millimeters) above the minimum
line. If the lubricant level should suddenly drop dramatically below the
minimum level, see theWorkshop Manualfor diagnostic procedure.
Installation, Tightening and Alignment
Make sure the threads on the studs and nuts are clean to permit correct
torque when installing wheels. The mounting surfaces of rims, wheels,
spacer rings and clamps must be free of dirt, rust, lubricants or damage.
Use a wire brush to clean the mounting contact surfaces. Do not use
lubricant on threads.
After properly tightening the rim or wheel, check it for proper alignment.
Rotate the wheel with a piece of chalk attached to a steady, firm surface,
and placed to just barely clear the outside surface of the tire bead seat;
this procedure points out the high spot. A high spot does not necessarily
indicate unevenly tightened lug nuts, but may be the result of a bent
wheel.
Use the following installation procedure:
1. Slide inner rear or front tire and wheel in position over studs and push
it back as far as possible. Use care so you do not damage the threads on
the studs.
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Disc Wheel with Flange Nuts (Hub-piloted).
Front wheel mounting of flange nut
system.
A. Flange nut
B. Wheel(s)
C. Brake drum
D. Wheel stud (22 millimeter)
E. Wheel hub
2. Position the outer rear tire and wheel in place over the studs and
push it back as far as possible. Use care so you do not damage the
threads on the studs. Orient (clock) the outer wheel on the hub so it
allows access and clearance to the inner valve stem.
Rear wheel mounting of flange nut
system.
A. Flange nut
B. Wheel(s)
C. Brake drum
D. Wheel stud (22 millimeter)
E. Wheel hub
Aluminum Rear Disc Wheel with Flange Nuts (Hub-piloted).
A. Flange nut
B. Wheel(s)
C. Brake drum
D. Wheel stud (22 millimeter)
E. Wheel hub
F. Wheel locator pad
A
BC
D
E
E
D
C
A
B
A
C
D
E
F
B
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Note for aluminum wheels:Clean each wheel locator pad on the hub
from all dirt, rust and foreign material prior to re-installing rear
aluminum hub-piloted wheels. Apply a light coat of chassis grease,
never-seize or disc brake corrosion control grease, only to the wheel
locator pad.
3. Run the nuts on the studs until they contact the wheel(s). Rotate the
wheel assembly a half-turn to permit the parts to seat.
4. Draw-up the nuts alternately following the crisscross sequence
illustrated under the following wheel tightening sequence illustrations.
Do not fully tighten the nuts. This allows uniform seating of the nuts and
makes sure even face-to-face contact of the wheel and hub.
8–lug wheel
10–lug wheel
5. Continue tightening the nuts to the torque specifications in the torque
chart using the same crisscross sequence shown.
6. After operating the vehicle approximately 50 miles (80 kilometers),
check the nuts for tightness. You may encounter some natural seating of
parts and the torque on the nuts can drop. Retighten all nuts to
specifications.
Once a week, inspect and retighten the wheel stud nuts.
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2015 F-650/750(f67)
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Note:Make sure the tire valve stem clears the brake caliper when
installing the tire and rim assembly on disc-brake equipped axles. The
use of a tire manufacturer’s stem forming tool is the only acceptable
method of obtaining clearance when necessary.
Proper Torque
It is important to tighten and maintain wheel and rim mounting nuts to
the proper torque. Loose nuts or over-tightened nuts can lead to
premature wear and possible failure of the wheel or mounting hardware.
Changing Wheel Types
WARNING:Use only the same type and style wheels and
mounting hardware to replace original parts. Failure to do so may
result in an assembly that looks fine, but does not fit together properly.
This could possibly cause wheel or fastener failures which could result
in property damage, personal injury or death.
Note:Do not attempt to mix stud-piloted wheels or fasteners with
hub-piloted wheels or fasteners.
Note:Do not change from aluminum wheels to steel wheels or
vice-versa without changing the mounting hardware required or, with
flange nut mounting systems, changing the hub and stud assembly.
Consult your dealer or wheel or rim distributor before attempting any
wheel or fastener changes.
TECHNICAL SPECIFICATIONS
Wheel Lug Nut Torque Specifications
Note:Do not use lubrication on dry threads. Where excessive corrosion
exists, you can apply a light coat of lubricant on the first three threads
of the stud bolt. Keep lubricant away from the:
•Hex nut and rim clamp contact surfaces.
•Cap nut ball face and ball seat on the disc wheel.
•Flange nut washer surface and flat on the disc wheel.
Size Nut MountingTorque
ft-lb N•m
22 mm Flange 450–500 610–678
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ENGINE SPECIFICATIONS (GASOLINE ENGINE ONLY)
Engine 6.8L V10 engine
Cubic inches 413
Required fuel Minimum 87 octane
Firing order 1-6-5-10-2-7-3-8-4-9
Spark plug gap 0.039–0.043 inch (1.0–1.1 mm)
Ignition system Coil on plug
Compression ratio 9.2:1
Engine Drivebelt Routing
6.8L V10 engine with air
conditioning
6.8L V10 engine - without air
conditioning
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2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
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TECHNICAL SPECIFICATIONS
Component SpecificationViscosity / Ambient
Temperature / NotesEquivalent Ford
Part Name / Number
Non-driving front axle
Eaton-Spicer axle
(generic) - front axle
wheel bearing oilMultipurpose EP gear
lube of API GL-5
quality meeting
MIL-PRF-2105E
specifications including
synthetic lubricants.
Do not mix
conventional and
synthetic lubricants.SAE 75W:
–40°F to –15°F
(–40°C to –26°C)Motorcraft SAE
75W-140 Synthetic
Rear Axle Lubricant /
XY–75W140–QL
SAE 75W-80:
–40°F to 80°F
(–40°C to 27°C)
SAE 75W-140:
–40°F and above
(–40°C and above)
SAE 80W-140:
–15°F and above
(–26°C and above)
SAE 85W-140:
10°F and above
(–12°C and above)
SAE 80W-90:
–15°F to 100°F
(–26°C to 38°C)Motorcraft SAE
80W-90 Premium Rear
Axle Lubricant /
XY–80W90–QL
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Canadian_French(fr_can)