are not slipping. The differential must not be locked when the vehicle is
traveling down steep grades and traction is minimal.
Note:Never use the differential lock at vehicle speeds above 25 mph (40
km/h).
Note:The driver-controlled differential lock function will vary with some
transmissions.
•Vehicles equipped with an Allison 3000 Series transmission:The
differential lock and differential lock light will automatically disengage
at speeds above 25 mph (40 km/h). The differential lock will remain
off until either the vehicle is restarted or the differential lock switch is
turned off then back on.
•Vehicles equipped with a 5–speed, 6–speed or 7–speed manual
transmission or a non-MD automatic transmission:The driver
must manually deactivate the differential lock if using it at speeds
above 25 mph (40 km/h).
•Vehicles equipped with a 10–speed transmission:The differential
lock can only be activated when in low range and it will only stay
activated until it is turned off or when the transmission is put into
high range. When active and shifted into high range, it will temporarily
deactivate (automatically) until low range is selected again.
Axle conversions
It is not recommended, or approved, for axle conversions to be
performed. However, it is understood that, on occasion, aftermarket
add-on axles are installed by others on the truck chassis which allow
operator control for weight transfer from other axles (i.e., air lift axles).
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.
TWO-SPEED REAR AXLE (IF EQUIPPED)
A two-speed rear axle allows the driver to select a LO range for greater
pulling power and a HI range for greater road speed and fuel economy.
These ranges can also be used to provide additional steps between
transmission shifts when driving on steep grades and/or fuel economy
may be factors.
2006 F-650/750(f67)
Supplement
USA(fus)
Driving
134
power steering fluid and hydraulic brake fluid. Failure to observe
precautions preventing the contamination of either system with fluid
from the other will result in swelling and deterioration of rubber parts
leading to reduced brake performance and eventual brake failure.
To avoid fluid contamination, the following should always be observed:
1. Use only fluids specified (or equivalent) and properly identified.
2. Add fluids only to the following locations:
•Power steering fluid to the power steering fluid pump reservoir
•Brake fluid to the brake master cylinder
Hydraulic brakes - brake lines, hoses and fittings
Inspect these components every 4,000 miles (6,000 km).
•Check lines for kinks, dents, corrosion or rupture.
•Check hoses for abrasions, kinks, soft spots or rupture, collapse,
cracks, twists or loose frame supports. When replacing a hose, be sure
there is adequate clearance to the hose to avoid an abrasion to the
new hose.
•Examine all connections for leaks.
•Repair or replace brake line tubes, hoses or fittings as required.
Driveline parking brake
Parking brake adjustment should only be performed by a qualified
technician, and in accordance with the instructions in the service
manual.
Use wheel chocks and exercise caution when inspecting under
the vehicle. A vehicle roll-away could result in property damage,
personal injury or death.
Catalytic converter
If your diesel engine is equipped with a catalytic converter, it is
important to review the maintenance schedule to ensure proper
functioning of the catalytic converter. Also, take precautions not to
damage the catalytic converter when servicing your engine or storing
your vehicle.
Note:If your vehicle is equipped with a catalytic converter/muffler,do
notblend waste oil with Diesel fuel. Operate only on low sulfur (less
than 500 parts per million sulfur) diesel fuel with a cetane value of 45 or
higher.
2006 F-650/750(f67)
Supplement
USA(fus)
Maintenance and Specifications
174
•Check tie rod, drag link end clamp bolts and ball joints. They must be
tight.
•Check for installation and spread of cotter pins and tightness of nuts
at both ends of the tie rod and drag link.
•Check that pitman arm (steering arm at steering gear) mounting is
tight and locked. Check system for leaks or hose chafing. Repair at
once.
•Maintain proper steering gear and power steering pump lubricant
levels.
•Regularly inspect steering column joint bolts and steering linkage,
particularly for body-to-chassis clearance.
Note:Have any steering problems corrected at once by a qualified
service technician.
Failure to maintain the steering system in proper condition can
cause reduced steering ability resulting in property damage,
personal injury or death.
Tightening steering column joint bolts
As a good maintenance practice, it is recommended that steering column
joint bolts be checked for tightness every 60,000 miles (96,000 km) or
annually, whichever occurs first. DO NOT OVERTIGHTEN.
Power steering
Whenever the power steering’s hydraulic system has been drained and
refilled for any reason, air must be bled from the system before returning
the vehicle to service. Failure to properly bleed the hydraulic system can
result in degradation of power system performance.
Consult your dealer who is aware of the proper procedures for filling and
bleeding the system.
Power steering fluid
Check the power steering fluid level using the following procedure. If
adding fluid is necessary, refer toLubricant Specificationsin this
chapter for the proper fluid type. Refer to theScheduled Maintenance
Guidechapter for the recommended service intervals.
1. Set the parking brake, shift into N (Neutral) (automatic transmission)
or 1 (First) (manual transmission) and turn the engine off.
2006 F-650/750(f67)
Supplement
USA(fus)
Maintenance and Specifications
189
2. Open the hood.
3. Clean the top of the power steering fluid reservoir.
4. Remove the dipstick from the reservoir and wipe the dipstick clean.
5. Reinstall the dipstick. Remove it again and check the fluid level.
•If the fluid temperature is at
approximately 68°-120°F
(20°-49°C) (fluid cool or warm
to the touch), check the COLD
side of the dipstick. The fluid
level should be within the FULL
range
•If the fluid level is below the ADD
line, add fluid in small amounts, continuously checking the level until
it reaches the proper level.
•If the fluid temperature is at
approximately 176°–230°F
(80°-110°C) (fluid too hot to
touch), check the HOT side of
the dipstick. The fluid level
should be within the FULL range.
•If the fluid level is below the ADD
line, add fluid in small amounts,
continuously checking the level until it reaches the proper level.
Note:The fluid level may also be checked by looking at the see-through
plastic reservoir. Make sure that the fluid is within the minimum and
maximum fluid range as marked on the reservoir.
A low fluid level may indicate a leak in the power steering system.
Inspect the power steering system and repair the leak. If necessary, see
your dealer or a qualified service technician.
To avoid damage to the power steering system,do notoperate the
vehicle with a low power steering fluid level.
Whenever the dipstick is installed, make sure it is properly seated and
tightened securely.
CLUTCH FLUID/LINKAGE ADJUSTMENTS
Clutch fluid (if equipped)
Check the clutch fluid level. Refer to theScheduled Maintenance
Guidechapter for the service interval schedules.
ADD MAX. COLDFULL
ADD MAX. HOTFULL
2006 F-650/750(f67)
Supplement
USA(fus)
Maintenance and Specifications
190
ComponentLubrication
typeViscosity /
Ambient
temperature /
NotesEquivalent
Ford part
name / number
Eaton-Spicer
axle, Spicer axle
- Front axle
wheel bearing
grease, tie rod
ends, drag link,
kingpin and
bushingEP2 Lithium
complex-based
moly grease (or
equivalent)
GC/LB NLGI #2
multi-purpose
lithium complex
greaseNote:
Eaton-Spicer
and Meritor
Easy Steer
axles: With
chassis load on
axle, force
grease through
thrust bearings;
then with axle
lifted clear of
the floor, force
grease between
kingpin and
bushing
surfaces.Motorcraft
Premium Long
Life Grease /
XG-1-C
Steering
Power steering
fluidInternational
TMS-6810— Fleetrite
CH990625C2
Steering gear
Ross TAS -
Output SealGC/LB NLGI #2
lithium
complex-based
moly grease or
multi-purpose
lithium complex
grease— Motorcraft
Premium Long
Life Grease /
XG-1-C
Steering column
U-joints / slip
jointGC/LB NLGI #2
lithium
complex-based
moly grease or
multi-purpose
lithium complex
grease— Motorcraft
Premium Long
Life Grease /
XG-1-C
2006 F-650/750(f67)
Supplement
USA(fus)
Maintenance and Specifications
220
Engine coolant and oil
Engine typeEngine coolant
(approximate
capacity)(1)
Engine oil
(approximate
capacity)
6.0L Power Stroke54.4 pints
(25.7L)19.0 quarts
(18.0L)
Caterpillar60.0 pints
(28.4L)Refer to the
engine operator
manual for
engine oil refill
capacities. Cummins B48.8 pints
(23.1L)
(1)Add the coolant originally equipped in your vehicle.
Power steering system
Steering gear Power steering fluid volume
TAS40 17.6 pints
TAS65 18.4 pints
Transmission
Description Pints (Liters)
Allison 3000/3500 5–speed automatic 58.0 (27.4)*
Allison 3000/3500 6–speed automatic 58.0 (27.4)*
2200/2500 Series 5–speed automatic 38.0 (18.0)*
FS-4205A 5–speed manual 11.5 (5.4)
FS-5205A 5–speed manual 12.5 (5.9)
FS-5406A/5406N 6–speed manual 19.5 (9.2)
FS-6406A/6406N 6–speed manual 19.5 (9.2)
ES56–7B/ES066–7B 7–speed manual 20.9 (9.9)
FR-9210B 10–speed manual 23.5 (11.1)
RT–8908LL 10–speed manual 28.0 (13.2)
*Total fluid capacity (dry transmission and torque converter).
2006 F-650/750(f67)
Supplement
USA(fus)
Maintenance and Specifications
232
Daily owner checks
EngineCheck the air filter restriction gauge.
Check the engine oil.
Inspect the coolant level (6.0L Power
Stroke engine; Caterpillar and
Cummins engines, refer to the
Owner’s Manual).
Brake systemCheck the air brake system reservoir
automatic drain valve operation.
Drain the air brake system reservoir -
manual valve.
Transmission systemVisually check the automatic
transmission for fluid leakage.
Steering systemCheck the power steering pump fluid
level and check the system for leaks.
Check the entire vehicle for evidence
of fluid leaks.
U.S. Department of
Transportation, Federal
Highway Administration
requirements (ensure that
the entire system is
functioning properly)Check the service brakes.
Check the parking brake.
Check the steering mechanism.
Check the lighting devices and
reflectors.
Check the tires.
Check the horn.
Check the windshield wipers.
Check the rear vision mirrors.
Check the wheels and rims.
Check the emergency equipment.
2006 F-650/750(f67)
Supplement
USA(fus)
Scheduled Maintenance Guide
241
Check every oil change (Oil change interval for the 6.0L Power
Stroke engine is 10,000 miles [16,000 km]; (refer to the
Caterpillar and Cummins service manuals for instructions and
information)
Fuel systemDrain the accumulated water or
sediment from the fuel tank(s).
Steering systemLubricate the steering shaft(s),
U-joints and splines when equipped
with grease fittings.
Lubricate the front axle spindle pins.
Lubricate the steering linkage when
equipped with grease fittings.
Grease the power steering gear output
shaft.
* Coolant protection checks should be made just prior to the onset of
freezing weather, where applicable. If coolant is dirty or rusty in
appearance, the system should be drained, flushed and refilled with the
prescribed solution of cooling system fluid and water. Use only
permanent type coolant that meets Ford specifications
WSS-M97B51-A1. See the engine manufacturer’s operating guide for
supplemental corrosion inhibitor specifications.
In addition to the items to be performed daily or at each oil change, the
following need to be completed as specified:
GENERAL MAINTENANCE SERVICES
The following are vehicle checks that should be made periodically either
by the owner or a qualified technician. It is recommended that
deficiencies be brought to the attention of your dealer or another
qualified service outlet as soon as possible in order that advice regarding
the need for service or replacement can be obtained.
2006 F-650/750(f67)
Supplement
USA(fus)
Scheduled Maintenance Guide
243