2015 FORD F750 rear axle

DRIVESHAFT
Check the universal joints for any evidence of wear or looseness at the
regular lubrication interval. Stop your vehicle immediately, should
driveshaft vibrations occur, to avoid possible hazardous consequences or
damage to other components.
REAR AXLE FLUID
Your rear axle may have an optional synthetic lubricant that allows the
use of extended service intervals. A tag on the filler plug identifies the
use of the synthetic lubricant.
Only use a lubricant that meets manufacturer specifications. See the
Capacities and Specificationschapter.Use of a non-approved rear
axle lubricant may cause internal axle component damage.
Checking the Fluid Level
See theScheduled Maintenancechapter for lubricant check intervals.
1. Park your vehicle on level ground.
2. Set the parking brake and shift into positionNorP(automatic
transmission), or first gear (manual transmission). Turn the engine
off.
3. Clean any dirt from around the axle filler plug.
4. Remove the filler plug and inspect the lubricant level. It should be at
the bottom of the filler plug opening.
5. Add lubricant, if necessary, through the filler plug opening.
6. Clean and install the filler plug securely.
Changing the Fluid
See theScheduled Maintenancechapter for lubricant change intervals.
1. Drain the rear axle while the lubricant is warm.
2. Park your vehicle on level ground.
3. Set the parking brake and shift into positionNorP(automatic
transmission), or first gear (manual transmission). Turn the engine
off.
4. Clean any dirt from around the rear axle filler and drain plugs.
5. Remove the filler and drain plugs. Drain the lubricant into a suitable
container. Dispose of all used automotive fluids in a responsible
manner following your local authorized standards.
6. Clean and install the drain plug securely.
7. Add lubricant through the filler plug opening.
8. Clean and install the filler plug securely.
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SPRING U-BOLT CHECKS
Check U-bolt nuts and re-torque every 36000 miles (60000 kilometers)
after initial 1000-mile (1600 kilometer) re-torque. Clean and lubricate the
U-bolt and nut threads and seats to make sure they are in 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 axle – 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-torqueing and installation information below.
Air Suspension U-bolt Checks and Re-torqueing 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 you can turn any nuts with a
force below the specified torque.
3. Using the lowest discovered torqued nut as a starting point,
re-tighten the nuts using the sequence listed underAir suspension
U-bolt and U-bolt nut installation.
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.
BRAKE FLUID CHECK
WARNING:Brake fluid is toxic. If brake fluid contacts the eyes,
flush eyes with running water for 15 minutes. Seek medical
attention if irritation persists. If taken internally, drink water and induce
vomiting. Seek medical attention immediately.
220Maintenance
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Proper tire inflation, toe-in adjustment, loads, and road speeds are
important factors governing tire mileage, steering ease and
maneuverability.
Tire Loading
WARNING:Loading tires beyond their rated capacity decreases
tire life requiring more frequent replacement of tires. Overloading
creates an unsafe condition that may result in sudden air loss from a
tire failure resulting in an accident that could cause property damage,
personal injury or death.
Note:Your GAW/GVW rating is correct at the time of your vehicle
production, and reflects the exact rating of the tires specified. When
replacing tires, make sure that the replacement tire load rating (listed in
pounds and kilograms on the tire sidewall) is the same or higher than
the tire that you are replacing. Failure to do so adversely affects
maximum load carrying capacity. Tires with the same size specification
do not always have the same load specification.
Note:The tire installed as original equipment may not be the same as
the tire specified on the DOT label, but has enough load capacity to
carry the GAW/GVW specified.
Note:Tires with the same size specification do not always have the same
load specification.
Matching Tires
Dual Tires:Dual tires should be matched using tires of equivalent size.
Do not mount tires that differ more than one-quarter inch (6
millimeters) in diameter or three-quarters inch (19 millimeters) in
circumference on the same dual wheel assembly.
Mixing:Never mix bias and radial tires on this vehicle. Never mix
different tire sizes or constructions on the same axle.
Rotation:
Rotation is always advisable:
•If there is irregular wear on the front (steering) axle tires, move to
rear position.
•In a dual assembly, reverse the position of the tires if one tire wears
much faster than its mate does.
•On the drive axle, if heel and toe wear or alternate lug wear occurs,
rotating the tires from one end of the axle to the other end of the
axle may help even out this wear.
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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.
248Wheels and Tires
2015 F-650/750(f67)
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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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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
Capacities and Specifications255
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Component SpecificationViscosity / Ambient
Temperature / NotesEquivalent Ford
Part Name / Number
Spicer axle - 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 32°F
(–40°C to 0°C)Motorcraft SAE
75W-140 Synthetic
Rear Axle Lubricant /
XY–75W140–QL
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 140W:
40°F and above
(4°C and above)
SAE 80W:
–15°F to 70°F
(–26°C to 21°C)Motorcraft SAE
80W-90 Premium Rear
Axle Lubricant /
XY–80W90–QL
SAE 90W:
10°F to 100°F
(–12°C to 38°C)
256Capacities and Specifications
2015 F-650/750(f67)
Owners Guide gf(ownloose), 1st Printing, December 2013
Canadian_French(fr_can)

Component SpecificationViscosity / Ambient
Temperature / NotesEquivalent Ford
Part Name / Number
Rear Axle
Eaton-Spicer -
two-speed axleRHEOLUBE 362 (or
equivalent) (Eaton
part number 113741)——
Eaton - single-speed
axleGeneric lubricant 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
Capacities and Specifications263
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