Service............................................................5-3
Accessories and Modifications..........................5-3
California Proposition 65 Warning.....................5-4
California Perchlorate Materials Requirements.....5-4
Doing Your Own Service Work.........................5-5
Engine Fan Breakage.....................................5-6
Fuel................................................................5-6
Gasoline Octane............................................5-6
Gasoline Specifications....................................5-7
Additives.......................................................5-7
Diesel Engine Fuel.........................................5-8
What Fuel to Use...........................................5-8
Very Cold Weather Operation.........................5-11
Water in Fuel...............................................5-11
Running Out of Fuel.....................................5-17
Fuel Filter Replacement.................................5-18
Fuels in Foreign Countries.............................5-19
Filling the Tank............................................5-20
Filling a Portable Fuel Container.....................5-22
Checking Things Under the Hood....................5-22
Hood Latches...............................................5-23
Engine Oil (DURAMAX Diesel Engine).............5-24
Engine Oil (Caterpillar Diesel Engine)..............5-27
Engine Oil (Isuzu Diesel Engine).....................5-28
Engine Oil (Gasoline Engine)..........................5-32
Engine Oil Life System (Gasoline Engine)........5-35Engine Oil Life System (DURAMAX/Isuzu
Diesel Engines).........................................5-36
Engine Oil Life System (Caterpillar
Diesel Engine)..........................................5-38
Engine Air Cleaner/Filter................................5-38
Automatic Transmission Fluid.........................5-42
Manual Transmission Fluid.............................5-42
Cooling System............................................5-43
Engine Coolant (Caterpillar Diesel Engines)......5-47
Coolant Surge Tank Pressure Cap..................5-47
Engine Overheating.......................................5-48
Engine Fan Noise.........................................5-49
Power Steering Fluid.....................................5-49
Windshield Washer Fluid................................5-50
Brakes........................................................5-52
Battery........................................................5-61
Jump Starting...............................................5-62
Rear Axle.......................................................5-67
Rear Axle Shift Motor....................................5-68
Four-Wheel Drive............................................5-68
Front Axle......................................................5-69
Noise Control System.....................................5-70
Tampering with Noise Control System
Prohibited.................................................5-70
Bulb Replacement..........................................5-71
Section 5 Service and Appearance Care
5-1
Automatic Transmission Fluid
When to Check
A good time to check your automatic transmission fluid
level is when the engine oil is checked. See your
Allison Automatic Transmission Operator’s Manual to
find out when to change your transmission fluid
and filters.
How to Check and What to Use
The Allison Automatic Transmission Operator’s Manual
that came with the vehicle shows how to check the
automatic transmission fluid and what fluid to use.
Automatic Transmission External Filter
Your automatic transmission filter requires periodic
replacement.
Consult the Allison Automatic Transmission Operator’s
Manual that came with the vehicle for proper change
intervals.
Manual Transmission Fluid
When to Check
A good time to have it checked is when the engine oil is
checked. Refer to the Maintenance Schedule to find out
when to check and change your manual transmission
fluid. SeeScheduled Maintenance on page 6-5.
How to Check and What to Use
Check the fluid level only when your engine is off, the
vehicle is parked on a level place, and the transmission
is cool enough for you to rest your fingers on the
transmission case.
To check the transmission fluid level, do the following:
1. Remove the filler plug.
2. Check to be sure that the lubricant level is up
to the bottom of the fill opening. On heavy duty
transmissions, an inch of oil level equals about
one gallon of fluid.
3. If the fluid level is good, reinstall the plug and be
sure it is fully seated. If the fluid level is low, add
more fluid as described in the next steps. Refer to
the Maintenance Schedule to determine what
kind of fluid to use. SeePart C: Recommended
Fluids and Lubricants on page 6-31.
5-42
Capacities and Specifications
The following approximate capacities are given in English and metric conversions. SeePart C: Recommended Fluids
and Lubricants on page 6-31for more information.
ApplicationCapacities
English Metric
Air Conditioning Refrigerant R134aFor the air conditioning system refrigerant charge
amount, see the refrigerant caution label located
under the hood. See your dealer/retailer for more
information.
Cooling System – C4/C5 Models
6.6L V8 Automatic Transmission 27.9 qt 26.4 L
8.1L V8 Automatic Transmission 29.8 qt 28.2 L
8.1L V8 Manual Transmission 30.1 qt 28.5 L
Cooling System – C6/C7/C8 Automatic Transmission
7.2L L6 Engine 32.0 qt 30.2 L
Isuzu 6H Engine (207 - 275 hp) 34.8 qt 32.9 L
Isuzu 6H Engine (300 hp) 33.9 qt 32.1 L
8.1L V8 Engine 32.5 qt 30.8 L
5-102
ApplicationCapacities
English Metric
Rear Axle – Two-Speed
19060T (HPL), 22060T (HPH) 38.0 pt 18.0 L
21060T (H15) 38.0 pt 18.0 L
23082T (H25) 44.0 pt 20.8 L
26080T (GJ4) 44.0 pt 20.8 L
Transfer Case (Four-Wheel Drive) 4.0 pt 1.9 L
Transmission Fluid, Automatic
3000 RDS and EVS, and 3500 RDS and EVS with PTO
Provision59.0 pt 28.1 L
3000 RDS and EVS, and 3500 RDS and EVS without PTO
Provision52.0 pt 24.6 L
1000 HS, RDS, MH, PTS and EVS, 2200 HS, RDS, MH,
PTS and EVS, 2500 HS and RDS, and 2300 HS and RDS35.0 pt 16.5 L
Add 2 pints (1 L) when changing spin-on or remote filter.
See the Allison
®Automatic Transmission Operator’s Manual for fluid check and maintenance information.
5-106
Part C: Recommended Fluids and
Lubricants
Fluids and lubricants identified below by name, part
number, or specification can be obtained from your
dealer/retailer.
Usage Fluid/Lubricant
Engine Oil
(Gasoline
Engine)Engine oil which meets GM Standard
GM6094M and displays the
American Petroleum Institute (API)
Certified for Gasoline Engines
starburst symbol. To determine the
proper viscosity for your vehicle’s
engine, see “Engine Oil” in the Index.
Engine Oil
(DURAMAX
®/
Isuzu Diesel
Engines)Engine oils with the letters CJ-4 are
required for your vehicle. The CJ-4
designation can appear either alone
or in combination with other
American Petroleum Institute (API)
designations, such as API CJ-4/SL.
These letters show API levels of
quality. To determine the preferred
viscosity for your vehicle’s diesel
engine, see “Engine Oil” in the Index.
Engine Oil
(Caterpillar
®
Diesel Engine)See the Caterpillar
®Operation &
Maintenance Manual for engine oil
recommendations.
Usage Fluid/Lubricant
Engine Coolant
(Caterpillar
®
Diesel Engine)See the Caterpillar
®Operation &
Maintenance Manual for engine
coolant recommendations.
Engine Coolant
(Gasoline
Engine &
DURAMAX
®/
Isuzu Diesel
Engines)50/50 mixture of clean, drinkable
water and use only DEX-COOL
®
Coolant. SeeEngine Coolant
(Caterpillar Diesel Engines) on
page 5-47.
Hydraulic Brake
SystemDelco
®Supreme 11 Brake Fluid or
equivalent DOT-3 brake fluid.
Windshield
Washer SolventOptikleen
®Washer Solvent.
Clutch Bearing
LubricantClutch Bearing Lubricant (GM Part
No. 12378484 or equivalent NLGI
#3 consistency).
Exhaust Brake
Ball Joint Cap
LubricantHigh-Temperature Grease
(GM Part No. U.S. 1051344,
in Canada 903037) or NLGI #3
consistency.
Power Steering
SystemDEXRON
®-VI Automatic
Transmission Fluid.
Manual
TransmissionSynthetic Manual Transmission Fluid
(GM Part No. U.S. 88861952,
in Canada 88861953).
Automatic
TransmissionSee the Allison Transmission
®
Operator’s Manual for correct
transmission fluid.
6-31
Audio System(s).............................................3-49
Automatic Transmission
Fluid..........................................................5-42
Operation...................................................2-27
B
Battery..........................................................5-61
Bench Seat, Split............................................. 1-6
Brake
Diesel Engine Exhaust.................................2-26
Emergencies................................................ 4-5
Exhaust Indicator Light.................................3-41
Trailer Hand Control Valve.............................. 4-6
Brake Fluid....................................................5-52
Brakes..........................................................5-52
Hydraulic Systems......................................... 4-4
Parking Brake Burnish Procedure...................2-43
System Warning Light..................................3-31
Braking........................................................... 4-4
Braking in Emergencies..................................... 4-5
Break-In, New Vehicle.....................................2-10
Bucket Seats................................................... 1-2
Bulb Replacement...........................................5-71
Buying New Tires...........................................5-79
C
California Perchlorate Materials
Requirements............................................... 5-4
California Proposition 65 Warning....................... 5-4
Capacities and Specifications..........................5-102
Carbon Monoxide...................................2-45, 4-17
Care of
Safety Belts................................................5-89
Center Console Storage Area...........................2-53
Change Fuel Filter Warning Light......................3-45
Charging System Light....................................3-29
Check
Engine Lamp..............................................3-36
Gages Warning Light...................................3-43
Checking Things Under the Hood......................5-22
Chemical Paint Spotting...................................5-93
Child Restraints
Child Restraint Systems...............................1-36
Infants and Young Children...........................1-32
Lower Anchors and Tethers for Children..........1-40
Older Children.............................................1-28
Securing a Child Restraint in a Rear
Outside Seat Position...............................1-40
Securing a Child Restraint in the Center
Front Seat Position...................................1-44
2
Engine (cont.)
Overheating................................................5-48
Overspeed Warning Light..............................3-40
Reduced Power Light...................................3-42
Shutdown Warning Light...............................3-40
Speed Limiter.............................................3-25
Starter Over-Crank Protection........................2-12
Starting Diesel............................................2-14
Starting the Gasoline...................................2-12
Entry Lighting.................................................3-17
Event Data Recorders.....................................7-12
Exhaust Brake Indicator Light...........................3-41
Exhaust Restrictor...........................................2-22
Extender, Safety Belt.......................................1-28
Exterior Lamps...............................................3-14
F
Filter
Engine Air Cleaner......................................5-38
Filter Minder Gage..........................................3-46
Finish Damage...............................................5-93
Fixed Mast Antenna........................................3-58
Flashers, Hazard Warning.................................. 3-6
Flat Tire........................................................5-85
Fluid
Automatic Transmission................................5-42
Power Steering...........................................5-49
Windshield Washer......................................5-50
Four-Wheel Drive....................................2-30, 5-68Front Axle......................................................5-69
Front Wheel Bearings with
Oil-Filled Hubs............................................5-75
Fuel............................................................... 5-6
Additives...................................................... 5-7
Change Filter Warning Light..........................3-45
Diesel Engine Fuel........................................ 5-8
Driving for Better Economy............................. 4-2
Filling a Portable Fuel Container....................5-22
Filling the Tank...........................................5-20
Filter..........................................................5-72
Filter Replacement.......................................5-18
Fuels in Foreign Countries............................5-19
Gage .........................................................3-44
Gasoline Octane........................................... 5-6
Gasoline Specifications.................................. 5-7
Primary Filter and Water Separator................5-73
Running Out of Fuel....................................5-17
Secondary Filter and Water
Separator/Heater......................................5-74
Very Cold Weather Operation........................5-11
Water in Fuel..............................................5-11
Water in Warning Light.................................3-45
What Fuel to Use.......................................... 5-8
Fuses
Fuses and Circuit Breakers...........................5-96
Instrument Panel Fuse Block.........................5-96
Underhood Fuse Block.................................5-99
Windshield Wiper.........................................5-95
5
Starting the Gasoline Engine............................2-12
Steering.......................................................... 4-9
Steering Wheel, Tilt Wheel................................. 3-6
Storage Areas................................................2-53
Center Console Storage Area........................2-53
Stuck in Sand, Mud, Ice, or Snow.....................4-19
Sun Visors...................................................... 2-9
Suspension, Air..............................................2-44
Switchbanks, Instrument Panel..........................3-18
T
Tachometer....................................................3-25
Theft-Deterrent, Radio.....................................3-57
Tilt Wheel........................................................ 3-6
Time, Setting..................................................3-48
Tires.............................................................5-76
Aluminum or Chrome-Plated Wheels,
Cleaning.................................................5-92
Buying New Tires........................................5-79
Cleaning....................................................5-92
Dual Tire Operation.....................................5-78
If a Tire Goes Flat.......................................5-85
Inflation - Tire Pressure................................5-77
Tightening the Wheel Nuts............................5-80Tires (cont.)
Wheel Alignment and Tire Balance.................5-80
Wheel Loading............................................5-78
Wheel Replacement.....................................5-84
When It Is Time for New Tires......................5-78
Tow Hooks.....................................................4-20
Towing
Your Vehicle...............................................4-23
Traction
Control System (TCS).................................... 4-8
Trailer
Connections................................................4-25
Trailer Brake Hand Control Valve........................ 4-6
Transmission
Fluid, Automatic...........................................5-42
Fluid, Manual..............................................5-42
Service Warning Light..................................3-30
Temperature Gage.......................................3-40
Transmission Operation, Automatic....................2-27
Transmission Operation, Manual........................2-28
Trip Odometer................................................3-25
Turn and Lane-Change Signals.......................... 3-7
Turn Signal/Multifunction Lever........................... 3-7
Two-Speed Rear Axle......................................2-36
11