Page 375 of 448

Required Maintenance For Noise Control Systems
The following maintenance services must be performed
every 6 months or 6,000 miles (9 600 km), whichever
comes first, to assure proper operation of the noise
control systems. In addition, inspection and service
should be performed anytime a malfunction is observedor suspected. Proper maintenance of the entire vehicle
will help the effectiveness of the noise control systems.
Exhaust System
Inspect the entire exhaust system for leaks and damaged
parts. Devices such as hangers, clamps, and U-bolts
should be tight and in good condition. Damaged compo-
nents, burned or blown out mufflers, burned or rusted
out exhaust pipes should be replaced according to the
procedures and specifications outlined in the appropriate
service manual.
Air Cleaner Assembly
Inspect air cleaner housing for proper assembly and fit.
Make certain that the air cleaner is properly positioned
and that the cover is tight. Check all hoses leading to the
cleaner for tightness. The air filter element must also be
clean and serviced according to the instructions outlined
in the Maintenance Schedule Section of this manual.
MAINTAINING YOUR VEHICLE 375
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Page 402 of 448

EMISSION CONTROL SYSTEM MAINTENANCE
The “Scheduled” maintenance services, listed inbold
typein this section (Section 8) must be done at the times
or mileages specified to assure the continued proper
functioning of the emission control system. These, and all
other maintenance services included in this manual,
should be done to provide best vehicle performance and
reliability. More frequent maintenance may be needed for
vehicles in severe operating conditions such as dusty
areas and very short trip driving.
Inspection and service also should be done any time a
malfunction is suspected.
NOTE:Maintenance, replacement, or repair of the emis-
sion control devices and systems on your vehicle may be
performed by any automotive repair establishment or
individual using any automotive part which has been
certified pursuant to U.S. EPA or, in the State of Califor-
nia, California Air Resources Board regulations.
MAINTENANCE SCHEDULES — 24–VALVE
CUMMINS TURBO DIESEL
There are two maintenance schedules that show the
requiredservice for your vehicle.
First is Schedule“B”. It is for vehicles that are operated
under the conditions that are listed below and at the
beginning of the schedule.
•Frequent short trips where the engine does not achieve
full operating temperature (operating temperature de-
fined as 190° F (66° C) coolant temperature).
•Extensive engine idling (over 10 minutes per hour of
operation) at ambient temperatures less than 32° F (0°
C).
•Driving in dusty conditions.
•Frequent trailer towing.
•Taxi, police, or delivery service (commercial service).
402 MAINTENANCE SCHEDULES
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Page 405 of 448
Schedule “B”
Follow schedule “B” if you usually operate your vehicle
under one or more of the following conditions.
•Frequent short trips where the engine does not achieve
full operating temperature (operating temperature de-
fined as 190° F (66° C) coolant temperature).
•Extensive engine idling (over 10 minutes per hour of
operation) at ambient temperatures less than 32° F (0°
C).
•Driving in dusty conditions.
•Frequent trailer towing.
•Taxi, police, or delivery service (commercial service).
•Off-road or desert operation.
•Extensive operation at high engine speeds (greater
than 2900 rpm) and loads (greater than 70% throttle).
NOTE:IfANYof these apply to you then change your
coolant every 102,000 miles (163 000 km) or 60 months,
whichever comes first and follow schedule “B” of the
Maintenance Schedulessection of this manual.
SCHEDULE “B” 405
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Page 415 of 448
Miles 116,250 120,000 123,750 127,500 131,250 135,000
(Kilometers) (186 000) (192 000) (198 000) (204 000) (210 000) (216 000)
Replace fuel filter element. Clean the water in
fuel sensor.XX
Inspect front wheel bearings. X
Change rear axle fluid. X X
Change front axle fluid (4X4). X X
Change 6-spd manual transmission (G-56)
fluid 2500/3500 models only.X
Inspect brake linings. X X
Inspect and adjust parking brake if necessary. X X
Drain and refill automatic transmission fluid
and change main sump and spin-on cooler
return filter (if equipped) (545 RFE only).X
Drain and refill automatic transmission fluid.
Replace filter and adjust bands (48RE only).X
Inspection and service should also be performed anytime a
malfunction is observed or suspected. Retain all receipts.
SCHEDULE “B” 415
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Page 422 of 448
Miles 112,500 120,000 127,500 135,000 142,500 150,000
(Kilometers) (181 000) (193 000) (205 000) (217 000) (229 000) (241 000)
[Months] [90] [96] [102] [108] [114] [120]
Replace fuel filter element. Clean the water in
fuel sensor.XXX
Inspect front wheel bearings. X X
Inspect brake linings. X X
Inspect and adjust parking brake if necessary. X X
Adjust valve lash clearance.X
Inspection and service should also be performed anytime
a malfunction is observed or suspected. Retain all re-
ceipts.
WARNING!
You can be badly injured working on or around a
motor vehicle. Do only that service work for which
you have the knowledge and the right equipment. If
you have any doubt about your ability to perform a
service job, take your vehicle to a competent me-
chanic.
422 SCHEDULE “A”
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Page 439 of 448

Low Washer Fluid..................... 168
Passing............................. 119
Seat Belt Reminder..................... 163
Service...........................384,385
Side Marker.......................... 396
Transfer Case......................... 247
Transmission Warning................169,298
Turn Signal.................. 118,163,385,389
Warning (Instrument Cluster Description)..... 162
Limited-Slip Differential................254,369
Loading Vehicle......................... 286
Tires ............................... 264
Locks................................. 16
Child Protection........................ 21
Door................................ 16
Ignition.............................. 14
Keys................................ 11
Power Door........................... 17
Steering Wheel......................... 14Lower Anchors and Tether for CHildren (LATCH) . 60
Lubricants............................. 373
Lubrication, Body....................... 358
Lug Nuts............................. 322
Lumbar Support........................ 109
Maintenance........................... 340
Maintenance Procedures................... 343
Maintenance Schedule.................... 402
ScheduleA......................... 416
Manual, Service......................... 429
Manual Transmission..................241,370
Fluid Level Check...................... 370
Lubricant Selection..................... 399
Mirrors................................ 78
Automatic Dimming..................... 79
Electric Powered....................... 80
Outside.............................. 79
Rearview............................. 78
INDEX 439
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