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ELECTRICAL SYSTEM INSPECTIONS
Periodically inspect electrical connectors on the outside of the cab, and
on the engine and frame for corrosion and tightness. Exposed terminals
such as the fuel sender, cranking motor, alternator and feed-through
studs should be cleaned and re-coated with a lubricant sealing grease
such as MotorcraftSilicone Brake Caliper Grease and Dielectic
Compound XG-3, or equivalent. This should include the ground cable
connector for batteries, engine and cab as well as the jump starting stud.
Accessory feed connections
Vehicle electrical systems are complex and often include powertrain
components such as engine and transmission controls, instrument panels,
ABS, etc. While most systems operate on battery voltage (12 volts),
some systems can be as high as 90 volts or as low as 5 volts. Refer to the
Electrical Circuit Diagram Manuals, available from your vehicle’s
manufacturer, to ensure that any additional body lights and accessories
are connected to circuits that are both appropriate and not overloaded.
No modification should be made to any vehicle control system without
first contacting your dealer.
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.
Periodically check:
•
Condition of spring leaves for evidence of fatigue, bending or breakage.
•Condition of suspension mounting brackets and bushings.
•Torque rod mounting fasteners for tightness.
•For proper suspension alignment; this must be maintained at all times.
•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 must be re-torqued every
36,000 miles (58,000 km) thereafter. 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.
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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; it should be up
to 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.
Draining and refilling the rear axle lubricant
1. Drain the rear axle while the lubricant is warm.
2. Park the vehicle on level ground.
3. Set the parking brake and shift into N (Neutral) (automatic
transmission) or 1 (First) (manual transmission) and turn the engine off.
4. Clean any dirt from around the rear axle filler and drain plugs.
5. Remove the filler and drain plugs and 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.
WHEELS
General
Wheel bearings should be inspected, lubricated and adjusted at regular
intervals. This is especially important if operating in deep sand, mud or
water. Refer toLubricant specificationsin this chapter.
Mount wheel balance weights on the dome-side of the wheel only; failure
to do so may result in loss of wheel weight and/or damage to brakes or
wheels.
Important:Remember to replace the wheel air valves when the road
tires are replaced at the end of their useful life.
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Component Lubrication typeViscosity / Ambient
temperature / NotesEquivalent Ford part
name / number
Driveshaft
U-joint GC/LB NLGI #2 lithium
complex-based moly
grease or
multi-purpose lithium
complex grease— MotorcraftPremium
Long Life Grease /
XG-1-C
Clutch
Release bearing /
shafts / forkGC/LB NLGI #2 lithium
complex-based moly
grease or
multi-purpose lithium
complex grease— MotorcraftPremium
Long Life Grease /
XG-1-C
Reservoir DOT 3, WSS-M6C62-A
or WSS-M6C65-A1— High Performance DOT
3 Motor Vehicle Brake
Fluid, PM-1-C (U.S.) or
CPM-1-C (Canada)
Cooling system
Engine coolant WSS-M97B44-D — MotorcraftSpecialty
Orange Engine Coolant
(orange-colored) /
VC-3-B (US) / CVC-3-B
(Canada)
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Component Lubrication typeViscosity / Ambient
temperature / NotesEquivalent Ford part
name / number
Windshield washer
Washer fluid WSB-M8B16-A2 — MotorcraftPremium
Windshield Washer
Concentrate / ZC-32-A
(US) or CXC-37-(A, B,
D, and F) (Canada)
Transmission
Six-speed automatic
(6R140)— — MotorcraftMERCON
LV ATF / XT-10–QLV
Eaton-Fuller Petroleum oil: Engine
oil API-SL or API-CF
(MIL-L-2104E or
MIL-L-46152E)SAE 40W:
Below 10°F (–12°C)—
SAE 50W:
Above 10°F (–12°C)—
Mineral gear oil:
API-GL-1 (rust and
oxidation inhibited)SAE 75W:
Below 10°F (–12°C)—
SAE 80W–90:
Above 10°F (–12°C)—
Synthetic oil: Eaton,
Roadrangersynthetic
CD-50 transmission
fluidCD SAE 50W:
All temperatures—
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Component Lubrication typeViscosity / Ambient
temperature / NotesEquivalent Ford part
name / number
Spicer
(non-synchronized)
(lubricants are listed in
order of preference)Petroleum oil: Engine
oil API-SL or API-CF
(MIL-L-2104E or
MIL-L-46152E)SAE 40W:
Below 0°F (–18°C)—
SAE 50W:
Above 0°F (–18°C)—
Mineral gear oil:
API-GL-1 (rust and
oxidation inhibited)
(EP gear oils are not
acceptable)SAE 80W:
Below 0°F (–18°C)—
SAE 90W:
Above 0°F (–18°C)—
Synthetic oil: Synthetic
engine oil meeting
MIL-L-2104E or
MIL-L-46152E, API-SL
or API-CFCD SAE 50W:
All temperatures—
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Component Lubrication typeViscosity / Ambient
temperature / NotesEquivalent Ford part
name / number
Spicer (synchronized)
(lubricants are listed in
order of preference)Petroleum oil: Engine
oil API-SL or API-CF
(MIL-L-2104E or
MIL-L-46152E)SAE 40W:
Below 10°F (–12°C)—
SAE 50W:
Above 10°F (–12°C)—
Mineral gear oil:
API-GL-1 (rust and
oxidation inhibited)SAE 80W:
Below 10°F (–12°C)—
SAE 90W:
Above 10°F (–12°C)—
Synthetic oil: Synthetic
engine oil meeting
MIL-L-2104E or
MIL-L-46152E, API-SL
or API-CFSAE 50W:
All temperatures—
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Component Lubrication typeViscosity / Ambient
temperature / NotesEquivalent Ford part
name / number
Meritor Petroleum oil: Heavy
Duty Engine Oil
MIL-L-2104E or API-SL
or API-CF (previous
API designations
acceptable)SAE 30W:
Below 10°F (–12°C)MotorcraftSAE 30
Super Duty Motor Oil /
XO-30-QSD
SAE 40W or SAE 50W:
Above 10°F (–12°C)—
Mineral gear oil with
rust and oxidation
inhibitor API-GL-1.Do
not use multi-weight
and GL-5 EP gear
oils; they may cause
transmission failure
or damage.SAE 80W:
Below 10°F (–12°C)—
SAE 90W:
Above 10°F (–12°C)—
Synthetic oil:
MIL-L-2104E or
MIL-L-46152D.Do not
use multi-weight and
GL-5 EP gear oils;
they may cause
transmission failure
or damage.SAE 50W:
All temperatures—
Allison Refer to transmission operator’s manual
Eaton UltraShift Refer to transmission driver instructions manual
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Component Lubrication typeViscosity / Ambient
temperature / NotesEquivalent Ford part
name / number
Door window
regulatorsNGLI #2 multipurpose
lithium complex grease— Motorcraft
Multi-Purpose Grease
Spray / XL-5 or
Motorcraft
Multi-Purpose Grease /
XG-4
Weatherstripping Silicone lubricant — MotorcraftSilicone
Spray / XL-6
Engine oil
Diesel engine:Refer to engine operator manual
Maintenance and Specifications
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