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There are three types of maintenance
intervals for general vehicle environments:
On-Highway, City and Severe Service. In
all applications, monitoring miles
(kilometers) and time and when the engine
is due for an oil change determine the
actual interval. When the engine oil change
is required before the truck lubrication
interval, perform the lubrication at the
same time in order to reduce your vehicle
’s
time out of service.
Air Brake Adjustment WARNING
Failure to maintain proper air brake
adjustment can result in reduction
or loss of braking ability.
A qualified service technician, keeping to
the instructions in the service manual,
should perform air brake inspection and
adjustment or repairs.
Cam Brakes - Automatic Slack
Adjusters
WARNING
Do not manually adjust the
automatic slack adjusters to correct
excessive push rod stroke as it may
result in reduced brake effectiveness and
a vehicle crash. Excessive push rod stroke
indicates that a problem exists with the
automatic adjuster, with the installation
of the adjuster, or with foundation brake
components that manual adjustment does
not remedy. Seek service from a qualified
facility for excessive push rod stroke. Inspect standard air brakes equipped with
automatic slack adjusters for proper brake
adjustment as listed in the maintenance
schedule charts.
However, inspect the brakes more
frequently when subjecting them to heavy
use or adverse operating conditions such
as:
•
Frequent brake applications while fully
loaded.
• Operation on hilly or mountainous
terrain.
• Frequent operation on dirt, gravel or
mud.
Some aftermarket brake linings also
require more frequent inspections.
Owner Checks and Services
Make sure you perform the following basic
maintenance checks and inspections every
month or at six-month intervals.
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Check Every Month
Air filter restriction gauge. 1
Engine oil level.
Fuel and water separator. Drain if necessary, or if indicated by the information display. 1
Function of all interior and exterior lights.
Holes and slots in the tail pipe to make sure they are functional and clear of debris. 1
Tires (including spare) for wear and proper pressure. Windshield washer fluid level.
1 Diesel engine only. Check Every Six Months
Battery connections. Clean if necessary.
Body and door drain holes for obstructions. Clean if necessary.
Cooling system fluid level and coolant concentration (freeze-point protection). Door weatherstrips for wear. Lubricate if necessary.
Hinges, latches and outside locks for proper operation. Lubricate if necessary. Parking brake for proper operation.
Safety belts and seat latches for wear and function.
Safety warning lamps (brake, ABS, airbag and safety belt) for operation.
Washer spray and wiper operation. Clean or replace blades as necessary.
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Tightening Lug Nuts
Tighten the lug nuts to the specified torque 1
at 500 mi
(800 km) after any wheel disturbance (such as tire rota-
tion, changing a flat tire or wheel removal).
Single rear wheels
Tighten the wheel lug nuts to the specified torque 1
at
100 mi (160 km)
, and again at 500 mi (800 km) of new
vehicle operation and after any wheel disturbance (such as tire rotation, changing a flat tire or wheel removal).
Dual rear wheels
1 See
Technical Specifications (page 253).
Multi-point Inspection
In order to keep your vehicle running right,
it is important to have the systems on your
vehicle checked regularly. This can help
identify potential issues and prevent major
problems. We recommend having the
following multi-point inspection performed
at every scheduled maintenance interval
to help make sure your vehicle keeps
running great. Multi-point Inspection
Horn operation
Accessory drive belt(s)
Radiator, cooler, heater and A/C hoses
Battery performance
Suspension component for leaks ordamage
Engine air filter
Steering and linkage
Exhaust system
Tires (including spare) for wear and properpressure2
Exterior lamps operation
Windshield for cracks, chips or pits
Fluid levels 1
; fill if necessary
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Multi-point Inspection
Washer spray and wiper operation
For oil and fluid leaks
Hazard warning system operation
Hood rest for lubrication
1 Brake, coolant recovery reservoir, automatic transmission, power steering and window
washer.
2 If your vehicle is equipped with a temporary mobility kit, check the tire sealant expiration
Use By date on the canister. Replace as needed.
Be sure to ask your dealership service
advisor or technician about the multi-point
vehicle inspection. It is a comprehensive
way to perform a thorough inspection of
your vehicle. Your checklist gives you
immediate feedback on the overall
condition of your vehicle.
NORMAL SCHEDULED
MAINTENANCE
Intelligent Oil-Life Monitor™
(Diesel Engine Only)
Your diesel engine is equipped with an
Intelligent Oil-Life Monitor that determines
when you should change the engine oil
based on how your vehicle is used. By using
several important factors in its
calculations, the monitor helps reduce the
cost of owning your vehicle and reduces
environmental waste at the same time. This means you do not have to remember
to change the oil on a mileage-based
schedule. Your vehicle lets you know when
an oil change is due by displaying a
message in the information display.
The following table provides examples of
vehicle use and its impact on oil change
intervals. It is a guideline only. Actual oil
change intervals depend on several factors
and generally decrease with severity of
use.
When to expect the OIL CHANGE REQUIRED Message
Vehicle Use and Example
Interval
Normal
7,500– 10,000 mi
(12,000– 16,000 km) Normal commuting with highway driving
No, or moderate, load or towing
Flat to moderately hilly roads
No extended idling
Severe
5,000– 7,500 mi
(8,000– 12,000 km)
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When to expect the OIL CHANGE REQUIRED Message
Vehicle Use and Example
Interval
Moderate to heavy load or towing
Mountainous or off-road conditions
Extended idling
Extended hot or cold operation Extreme
3,000–5,000 mi
(4,800–8,000 km) Maximum load or towing
Extreme hot or cold operation
Use of high sulfur diesel fuel
Note: Use the appropriate special operating
condition for maintenance information
when using high sulfur diesel fuels,
operating your vehicle off-road or in dusty
conditions (such as unpaved roads).
Normal Maintenance Intervals
Gasoline Engines 7,500 mi (12,000 km) or Six Months (Whichever Comes First)
Change the engine oil and filter.
Rotate the tires 1
, inspect tire wear and measure tread depth.
Inspect the wheels and related components for abnormal noise, wear, looseness or
drag.
Perform a multi-point inspection (recommended).
Inspect front oil hubs for leaks and check fluid level through hub cap sight glass.
1 Vehicles with dual rear wheels should rotate the front wheels when specified; rear wheels
only if unusual wear is noted.
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15,000 mi (24,000 km) or 12 Months Whichever Comes First)
Inspect the automatic transmission fluid level. Consult an authorized dealer for
requirements.
Inspect the brake pads, shoes, rotors, drums, brake linings, hoses and parking brake.
Inspect the engine cooling system concentration (freeze-point protection), level and
hoses.
Inspect the exhaust system and heat shields.
Inspect the steering linkage, ball joints, suspension, tie-rod ends, driveshaft and U-joints.
Lubricate components equipped with grease fittings. Other Maintenance Items
Replace the engine air filter.
Every 30,000 mi
(48,000 km)
Replace the front wheel bearing grease and grease seal
if equipped with non-sealed bearings.
Every
60,000 mi
(96,000 km)
Replace the spark plugs.
Every
97,000 mi
(156,000 km)
Change the engine coolant.1
Every
105,000 mi
(168,000 km) Change the rear axle fluid. See Special Operating
Conditions Scheduled Maintenance (page 330).
Inspect the accessory drive belt(s). 2
Change the automatic transmission fluid and filter. Consult
an authorized dealer for requirements.
Every
150,000 mi
(240,000 km) Replace the accessory drive belt(s) if not replaced within
the last 100,000 mi (160,000 km).
Replace the front wheel bearings and seals if equipped
with non-sealed bearings.
1 Initial replacement at six years or
105,000 mi (168,000 km), then every three years or
45,000 mi (72,000 km).
2 If not replaced, inspect the belt(s) every
15,000 mi (24,000 km).
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Diesel Engine
At Every Oil Change Interval as Indicated by the Information Display
1
Change the engine oil and filter. 2
Drain the fuel filter water trap.
Refill the diesel exhaust fluid tank.
Rotate the tires 3
, inspect the tires for wear and measure tread depth.
Perform a multi-point inspection (recommended).
Inspect the air filter restriction gauge. Replace the filter if necessary.
Inspect the automatic transmission fluid level. Consult an authorized dealer for
requirements.
Inspect the brake pads, shoes, rotors, drums, brake linings, hoses and parking brake.
Inspect the engine and secondary coolant concentration (freeze-point protection), level
and hoses.
Inspect the exhaust system and heat shields.
Inspect the steering linkage, ball joints, suspension, tie-rod ends, driveshaft and U-joints.
Lubricate components equipped with grease fittings.
Inspect front oil hubs for leaks and check fluid level through hub cap sight glass.
1 Do not exceed one year or 10,000 mi (16,000 km) between service intervals.
2 Reset the Intelligent Oil-Life Monitor after engine oil and filter changes. See Oil Change
Indicator Reset
(page 194).
3 Vehicles with dual rear wheels should rotate the front wheels when specified; rear wheels
only if unusual wear is noted.
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Other maintenance items
1
Replace the engine-mounted and frame-mounted fuel
filters. 2
Every 22,000 mi
(36,000 km)
Inspect engine and secondary cooling system coolant
concentration (freeze-point protection), additive (corro-
sion inhibitor) strength, coolant level, and hoses. Add
coolant additive if necessary.3
Every
30,000 mi
(48,000 km)
Replace the air inlet foam filter.
Every
45,000 mi
(72,000 km)
Inspect the accessory drive belt(s). 4
At
90,000 mi
(144,000 km))
Change the rear axle fluid. See
Special Operating
Conditions Scheduled Maintenance
(page 330). 5
At
100,000 mi
(160,000 km)
Change the engine and secondary cooling system coolant. 6
Every
105,000 mi
(168,000 km) Change crankcase ventilation filter.
Change the automatic transmission fluid and filter. Consult
an authorized dealer for requirements.
Every
150,000 mi
(240,000 km)
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