2011 FORD F750 service

SUSPENSION INSPECTION
Note:Do not adjust air suspension height to any setting other than the
specified setting. Altering the height setting will change 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 lube oil change intervals.
Periodically:
•Check condition of spring leaves for evidence of fatigue, bending or
breakage.
•Check condition of suspension mounting brackets and bushings.
•Check that torque rod mounting fasteners are tight.
•Check to be sure the suspension alignment is maintained at all times.
•Check U-bolts after the chassis has been operating under load for
1,000 miles (1,600 km) or six months, whichever comes first, the
U-bolt nuts must be re-torqued. The U-bolt nuts thereafter must be
re-torqued every 36,000 miles (58,000 km). The U-bolt and nut
threads and seats should be cleaned and lubricated to ensure a “like
new” condition when re-torquing.
Note:See theU-bolt nut torquechart later in this section.
Supporting your vehicle for service
When performing service repairs on your vehicle, first prepare the
vehicle by doing the following:
1. Park the vehicle on a level concrete floor.
2. Set the parking brake and block the wheels to prevent the vehicle
from moving.
3. Select a jack with a rated capacity sufficient to lift and hold up the
vehicle.
4. Raise the vehicle with the jack applied to the axle(s). DO NOT use the
bumper as a lifting point.
5. Support the vehicle with floor stands under the axle(s). If the axle or
the suspension are being serviced, support the vehicle with floor stands
under the frame side-members, preferably between the axles.
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WARNING:Do not use a jack when working under a vehicle. It
may give way, causing the vehicle to fall and result in property
damage, personal injury or death. Always use floor stands to support
the vehicle.
FRAME AND TOW HOOKS
Your vehicles chassis is manufactured with frame rails of either HSLA
steel or heat-treated steel. Each must be handled in a specific manner to
ensure maximum service life. Before attempting frame repair or
modification, consult the service manual or your dealer.
It is important, particularly on vehicles where the tow hooks are used
frequently, to inspect the front and rear tow hooks for damage or a loose
mounting.
SPRING U-BOLT CHECKS
Check U-bolt nuts and re-torque every 36,000 miles (58,000 km) after
initial 1,000 miles (1,600 km) re-torque. The U-bolt and nut threads and
seats should be cleaned and lubricated to ensure peak condition when
re-torqued.
U-bolt nut torque
Suspension ft-lb N•m
Front axle – 8500 lb (3856 kg) 180-200 244-271
Front axles – 10000 lb (4536 kg) and higher 260-300 353-407
Rear axle with multi-leaf 260-300 353-407
Rear axle with IROS air suspension 370-400 502-542
Rear axle with Hendrickson air suspension 400–450 542–610
See air suspension U-bolt re-torquing and installation information below.
Air suspension U-bolt checks and re-torquing procedures
1. Inspect the threads of the U-bolt and nut for rust and debris. Clean
the threads if contaminated.
2. Using a torque wrench, determine if any nuts can be turned with a
force below the specified torque.
3. Using the lowest discovered torqued nut as a starting point, retighten
the nuts using the sequence listed underAir suspension U-bolt and
U-bolt nut installation.
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Air suspension U-bolt and U-bolt nut installation
1. Inspect the threads of the U-bolt and nut for rust and debris. Clean
the threads if contaminated.
2. Install the U-bolts and nuts and torque the nuts to seat the cap flat
which is about 18 ft-lb (25 N•m) using a diagonal pattern. Use the same
diagonal pattern for each of the following U-bolt nut re-torque steps.
3. Tighten U-bolt nuts in increments of 74 ft-lb (100 N•m) until
tightened to final torque for the particular suspension.
DRIVESHAFT
At the regular lubrication interval, check the universal joints for any
evidence of wear or looseness. Should driveshaft vibrations occur, stop
the vehicle immediately to avoid possible hazardous consequences or
damage to other components.
REAR AXLE LUBRICANT
Refer to theScheduled Maintenance Guidechapter for rear axle
lubricant level checks and lubricant change intervals.
Your rear axle may be filled with an optional synthetic lubricant which
allows the use of extended service intervals. A tag on the filler plug will
identify the use of the synthetic lubricant.
Use only a lubricant that meets manufacturer specifications (refer to
Lubricant specificationsin this chapter).
Use of a non-approved rear axle lubricant may cause internal axle
component damage.
Checking the rear axle lubricant level
1. Park the vehicle on level ground.
2. Set the parking brake and shift into N (Neutral) (automatic
transmission) or 1 (First) (manual transmission) and turn the engine off.
3. Clean any dirt from around the rear axle filler plug.
4. Remove the filler plug and inspect the lubricant level.
5. The lubricant level should be up to the bottom of the filler plug
opening.
6. If necessary, add enough lubricant through the filler plug opening so
that the lubricant level is at the bottom of the opening.
7. Clean and install the filler plug securely.
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WARNING:To avoid personal injury or death, always follow
these instructions when mounting radial tires on wheels:
•Only personnel that have had proper training and experience should
mount or remove tires from rims or wheels.
•Use only heavy-duty rims or approved rims for radial tires. It may be
necessary to contact your wheel and rim distributor to determine if
your rims are approved for radial tires.
•If a tube is to be used, make sure special radial tire tubes are used
because of the increased flexing of the sidewalls on radial tires.
•Never use anti-freeze, silicones, or petroleum based lubricants when
mounting radial tires. Only an approved lubricant should be used as
an aid for mounting tires.
•Always inflate tires in a safety cage.
•Do not attempt to mix stud piloted wheels or fasteners with hub
piloted wheels or fasteners. To do so may cause premature wheel
failure resulting in property damage, personal injury, or death.
•Do not mix foreign (not made in North America) wheel mounting
parts with domestic (made in North America) parts. Many foreign
wheel components look similar to, but not exactly the same as
domestic made components. Mixing components could cause wheel
or fastener failures and result in property damage, personal injury, or
death.
•Do not change from aluminum wheels to steel wheels or vice-versa
without changing the mounting hardware where required or, in some
cases with flange nut mounting systems, changing the hub and stud
assembly. Mixing components could cause wheel or fastener failures
and result in property damage, personal injury, or death.
All tires with Steel Carcass Plies (if equipped):
This type of tire utilizes steel cords in the sidewalls. As such, they
cannot be treated like normal light truck tires. Tire service, including
adjusting the air pressure, must be performed by personnel trained,
supervised and equipped according to Federal Occupational Safety and
Health Administration (OSHA) regulations. For example, during any
procedure involving tire inflation, the technician or individual must
utilize a remote inflation device, and ensure that all persons are clear of
the trajectory area.
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WARNING:An inflated tire and rim can be very dangerous if
improperly used, serviced or maintained. To avoid serious injury,
never attempt to re-inflate a tire which has been run flat or seriously
under-inflated without first removing the tire from the wheel assembly
for inspection. Do not attempt to add air to tires or replace tires or
wheels without first taking precautions to protect persons and
property.
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Stay out of the trajectory (1) as indicated in the illustration.
WARNING:Do not mount tube type tires on tubeless wheels or
tubeless tires on tube type wheels. To do so could result in tire
or wheel failure and cause property damage, personal injury or death.
Preserving proper inflation pressure is a very important maintenance
practice to insure safe vehicle operation and long life for the tires.
Failure to maintain correct inflation pressure may result in sudden tire
destruction, improper vehicle handling, and may cause rapid and
irregular tire wear. Therefore, inflation pressures should be checked daily
and always before long distance trips.
Follow the tire manufacturer’s recommended cold inflation pressure for
the tire size, type, load range (ply rating) and axle loading typical for
your operation. (Each steer axle tire load will equal
12steer axle loading;
each drive tire load will be14the axle loading if fitted with four tires).
Checking inflation
Always check inflation pressure when tires are cold. Never bleed air from
hot tires to relieve normal pressure build-up. Normal increases in
pressure due to service conditions will be 10–15 psi (69–103 kPa), which
is allowable in truck tires.
Tires should be properly inflated to manufacturers recommended
pressure for the size and service load in which the vehicle is being used.
Refer to the specific tire manufacturer with which your vehicle is
equipped with for the latest information concerning service load and
inflation pressure.
It is particularly important to keep moisture from the inside of tires, and
proper selection of air compressor equipment, proper air line routing,
and the use of shop air dryers is strongly recommended to avoid
moisture in the high pressure air used for tire inflation.
Under-inflation
Tires should not be permitted to become under-inflated. Increased
flexing due to under-inflation causes heat build-up within the tire
components. This leads to reduced strength, breakdown of the rubber
compounds, and possible separation of the tire components (i.e., ply and
tread separation and reduced retreadability).
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Transmission
Description Pints (Liters)
Allison 2000 Series 30.0 (14.2)*
Allison 3000 Series 37.6 (17.8)*
5–speed manual 12.5 (5.9)
6–speed manual 19.5 (9.2)
7–speed manual 22.0 (10.4)
*Total fluid capacity (dry transmission and torque converter).
Air conditioner refrigerant - r134a
This system uses PAG-type refrigerant oil.
Refrigerant fitting torque
Captured washer nut: 170–190 inch lb. (19–21 N•m)
Note:This system uses mineral-based refrigerant oil to lubricate o-rings
and fittings.
Fuel tanks
Standard tanks are listed as such; all other tanks available for your
vehicle are optional equipment.
Vehicle Tank type Gallons
(Liters)
F-650 Low Profile (standard), F-650
Dock HeightSingle, steel
rectangular35 (132)
F-650 Low Profile, F-650 Dock
Height (standard), F-750 Pick-up
and Delivery (standard), F-750
Severe Service (standard)Single, steel
rectangular45 (170)
F-650 Dock Height, F-750 Pick-up
and Delivery, F-750 Severe ServiceSingle, steel
rectangular50 (189)
F-650 Low Profile, F-650 Dock
Height, F-750 Pick-up and Delivery,
F-750 Severe ServiceSingle, steel
rectangular65 (246)
F-650 Dock Height, F-750 Pick-up
and Delivery, F-750 Severe ServiceSingle, steel
D-style65 (246)
F-650 Dock Height, F-750 Pick-up
and Delivery, F-750 Severe ServiceSingle, steel
D-style80 (302)
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Vehicle Tank type Gallons
(Liters)
F-650 Low Profile, F-650 Dock
Height, F-750 Pick-up and Delivery,
F-750 Severe ServiceDual, steel
rectangular25(LH)/45(RH)
(95[LH]/170[RH])
F-650 Low Profile, F-650 Dock
HeightDual, steel
rectangular35(RH)/45(LH)
(132[RH]/170[LH])
F-650 Low Profile, F-650 Dock
Height, F-750 Pick-up and Delivery,
F-750 Severe ServiceDual, steel
rectangular45/45 (170/170)
F-650 Dock Height, F-750 Pick-up
and Delivery, F-750 Severe ServiceDual, steel
D-style50/50 (189/189)
F-650 Low Profile, F-650 Dock
Height, F-750 Pick-up and Delivery,
F-750 Severe ServiceDual, steel
rectangular45(RH)/65(LH)
(170[RH]/246[LH])
F-650 Low Profile, F-650 Dock
Height, F-750 Pick-up and Delivery,
F-750 Severe ServiceDual, steel
rectangular65/65 (246/246)
F-650 Dock Height, F-750 Pick-up
and Delivery, F-750 Severe ServiceDual, steel
D-style65/65 (246/246)
F-650 Dock Height, F-750 Pick-up
and Delivery, F-750 Severe ServiceDual, steel
D-style65 (LH)/80 (RH)
(246[LH]/302[RH])
F-650 Dock Height, F-750 Pick-up
and Delivery, F-750 Severe ServiceDual, steel
D-style80/80 (302/302)
VEHICLE IDENTIFICATION NUMBER (VIN)
The VIN is printed on the Vehicle Rating Decal attached to the vehicle
on the edge of the driver’s door or B-Pillar. The VIN also serves as the
warranty number. If you ever find it necessary to communicate with Ford
Motor Company about your vehicle, always include the VIN in your
communication.
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