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366 Service and Maintenance
25. Automatic Transmission
Fluid :Check the automatic
transmission fluid level at each
engine oil change and replace fluid
every 48 000 km (30,000 miles). Do
not overfill.
26. Differential Gear Oil : Replace
lubricant every 48 000 km
(30,000 miles). Check lubricant level
every 16,000 km (10,000 miles) or
every 12 months, and add lubricant
to within 0 to 10 mm (0 to 0.4 inch)
of the bottom edge of the filler hole
if necessary.
27. Power Steering Fluid :
Replace power steering fluid every
24 months or 48 000 km
(30,000 miles), whichever occurs
first.
28. Power Steering Oil Hoses :
Replace power steering oil hoses
every 24 months or 80 000 km
(50,000 miles), whichever occurs
first.
29. Steering Wheel Free Play :
Check steering wheel free play after
the first 1 040 km (650 miles) and
then every 10 400 km (6,500 miles). Steering wheel free play
10-50 mm (0.39-1.97 in)
30. Steering Gear Box Torque :
Retighten the attaching bolts of the
steering gear box to the specified
torque every 12 months or every
32 000 km (20,000 miles) whichever
occurs first. Steering gear box tightening torque
103 Y(76 lb·ft)
31. Driveshaft Flange Torque :
Check the fixing bolts of driveshaft
flange for looseness or damage
after the first 16 000 km
(10,000 miles). Driveshaft flange tightening torque
103Y(76 lb·ft)
32. Driveshaft Lubrication :
Lubricate the grease fitting on the
center bearing, as well as each
universal joint and spline coupling
every 12 months or 16 000 km
(10,000 miles) whichever occurs
first. 33. Leaf Spring U-bolt Torque :
Tighten the U-Bolt nuts to the
specified torque after the first
1 040 km (650 miles), thereafter
every 16 000 km (10,000 miles).
Model Leaf spring U-bolt nut tightening torque
Front Rear
3500HD 127 Y
(94 lb·ft) 177
Y
(131 lb·ft)
4500HD 127 Y
(94 lb·ft) 177
Y
(131 lb·ft)
4500XD 196 Y
(145lb·ft) 177
Y
(131 lb·ft)
5500HD, 5500XD 196
Y
(145lb·ft) 284
Y
(209 lb·ft)
34. Wheel Nut Torque : Check tires
for excessive or abnormal wear,
or damage. Also check tire inflation
pressures and adjust.
Be sure wheels are not bent or
cracked and that wheel nuts have
been tightened to the specified
torque after the first 1,040 km
(650 miles) and then every
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Service and Maintenance 367
10 400 km (6,500 miles). Note that
there are left and right hand
threads.Wheel nut tightening torque
500Y(362 lb·ft)
35. King Pin : Lubricate the grease
fitting on the king pins every
12 months or 16 000 km
(10,000 miles) whichever occurs
first.
36. Wheel Bearing Grease : Clean
and repack front wheel bearings
every 24 months or 48 000 km
(30,000 miles) whichever occurs
first.
37. Air Conditioner Blower
Filter : The air conditioner blower
filter should be removed and
cleaned once a month.
38. Exhaust Injector : Clean the
exhaust injector every 176,000 km
(110,000 miles). 39. DEF Supply Pump Filter
Element :
Replace the DEF supply
pump filter element every
192 000 km (120,000 miles) or
24 months whichever occurs first.
40. Starter : The color displayed by
the starter indicator light will change
from green to amber when the
number of times remaining is 0 or
below and the screen is selected.
When the indicator light (amber)
comes on, have the vehicle
inspected/serviced at the nearest
dealer.Owner Checks and
Services
Before Driving
Proper care and driving is important
not only for extended service life of
your vehicle, but also for improved
fuel and oil economy. Drive carefully
and defensively. Be sure you know
how to use your truck and its
equipment before operating it.
Starting and Operating
Proper care and operation will not
only extend the service life of your
vehicle but also improve fuel
economy.
Check Around the Vehicle Before
Starting the Engine
Before pulling away, perform a
thorough safety check, making sure
there are no children or obstructions
around the vehicle.
Take off the chocks after confirming
that the parking brake is securely
applied. Sit behind the wheel, adjust
the seat position, and buckle up the
seat belt. The passengers are also
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Service and Maintenance 375
Additional
Maintenance and Care
Owner Safety and Routine
Maintenance
Listed below are vehicle checks
which should be made periodically
by either the owner or a qualified
technician to ensure proper
performance and safety of your
vehicle. Take any problems promptly
to a technician for service advice.
For your safety and that of others,
any of the safety-related
components that may have been
damaged in an accident should be
checked and necessary repairs
performed before operating your
vehicle.
At the minimum, these routine
checks should be made every
6 months or 16,000 km
(10,000 miles) for diesel vehicles,
or every 9,600 km (6,000 miles) for
gasoline vehicles, whichever comes
first. Whenever repairs are
necessary, have them completed
before operating the vehicle.A: Parking Brake :
Park on a fairly
steep hill and hold the vehicle with
the parking brake only. This checks
holding ability.
Before checking item (B) below, be
sure to have enough room around
the vehicle. Then firmly apply both
the parking brake see Parking
Brake 0221 and the regular brakes.
Do not use the accelerator pedal.
If the engine starts, be ready to turn
off the engine control switch at
once. Take these precautions
because the vehicle could move
without warning and possibly cause
injury or property damage.
B: Starter Safety Switch : Check
by trying to start the engine in each
gear. The starter should crank only
at selector position "P" or "N".
C: Transmission Shift Indicator :
Check that the indicator points to
the gear chosen.
D: Steering : Be alert for any
changes in steering action. An
inspection or service is needed
when: the steering wheel is harder to turn or has too much free play,
or when there are strange sounds
when turning or parking.
E: Wheel Alignment, Balance, and
Tires :
Check tires for abnormal
wear or damage. Also, check for
damaged wheels. A pull right or left
on a straight and level road may
show the need for a wheel
alignment. A vibration of the
steering wheel or seat at normal
highway speeds may mean a wheel
balancing is needed. Check tire
pressure when the tires are "cold,"
at least monthly, and whenever the
vehicle is serviced.
Check the pressure more often if
daily checks show it's needed.
(Refer to "Recommended Daily
(Pre-operation) Inspections" under
Owner Checks and Services 0367).
Change tire pressure as needed
when changing loads.
F: Brakes : Be alert to illumination
of the brake system warning light or
brake low vacuum warning light
(4500HD, 4500XD models) or the
tone alarm, or changes in braking
action, such as repeated pulling to
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412 Index
Proposition 65 Warning,California . . . . . . . . . . . . . . . . . 245, 326
R
Radio Frequency Statement . . . . 404
Radio Reception . . . . . . . . . . . . . . . . 112
Radios
AM-FM Radio . . . . . . . . . . . . . . . . . 108
Rear Axle . . . . . . . . . . . . . . . . . . . . . . . 283
Rear Seats . . . . . . . . . . . . . . . . . . . . . . 48
Rear Storage . . . . . . . . . . . . . . . . . . . . 63
Recommended Fluids and Lubricants . . . . . . . . . . . . . . . . . . . . . 378
Reduced Engine Power Light . . . . 91
Reimbursement Program, GM Mobility . . . . . . . . . . . . . . . . . . . 400
Remote Keyless Entry (RKE)
System . . . . . . . . . . . . . . . . . . . . . . . . . 32
Replacement Parts Maintenance . . . . . . . . . . . . . . . . . . 380
Reporting Safety Defects
General Motors . . . . . . . . . . . . . . . 405
U.S. Government . . . . . . . . . . . . . 405
Roads Driving, Wet . . . . . . . . . . . . . . . . . . 143
Roadside Assistance
Program . . . . . . . . . . . . . . . . . . . . . . . 400
Roofmarker Lamps . . . . . . . . . . . . . 295
Rotation, Tires . . . . . . . . . . . . . . . . . . 323 Routing, Engine Drive Belt . . . . . . 396
Running out of Fuel . . . . . . . . . . . . . 238
Running the Vehicle While
Parked . . . . . . . . . . . . . . . . . . . . . . . . 179
S
Safety Defects ReportingGeneral Motors . . . . . . . . . . . . . . . 405
U.S. Government . . . . . . . . . . . . . 405
Safety System Check . . . . . . . . . . . . 55
Scheduling Appointments . . . . . . . 401
Seat Belts . . . . . . . . . . . . . . . . . . . . . . . 49 Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Extender . . . . . . . . . . . . . . . . . . . . . . . . 55
Lap Belt . . . . . . . . . . . . . . . . . . . . . . . . 53
Reminders . . . . . . . . . . . . . . . . . . . . . . 83
Three-Point . . . . . . . . . . . . . . . . . . . . . 51
Use During Pregnancy . . . . . . . . . . 53
Seats Position, Front . . . . . . . . . . . . . . . . . . 44
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Security Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . 39
Selector Lever . . . . . . . . . . . . . . . . . . 214
Service . . . . . . . . . . . . . . . . . . . . . . . . . 131 Accessories and
Modifications . . . . . . . . . . . . . . . . 245
Climate Control System . . . . . . . 126
Doing Your Own Work . . . . . . . . 245 Service (cont'd)
Publications Ordering
Information . . . . . . . . . . . . . . . . . . 403
Scheduling Appointments . . . . . 401
Transmission Warning Light . . . . 88
Vehicle Soon Light . . . . . . . . . . . . . . 84
Shift Lock Control Function Check, Automatic
Transmission . . . . . . . . . . . . . . . . . . 285
Shopping Bag Hooks . . . . . . . . . . . . 64
Sidemarker Lamps . . . . . . . . . . . . . 295
Signals, Turn and Lane-Change . . . . . . . . . . . . . . . . . 105
Specifications and
Capacities . . . . . . . . . . . . . . . . . . . . . 389
Speed Limiter . . . . . . . . . . . . . . . . . . . 231
Speedometer . . . . . . . . . . . . . . . . . . . . 80
Starting and Stopping the Vehicle . . . . . . . . . . . . . . . 165, 168
Steering . . . . . . . . . . . . . . . . . . . . . . . . 143 Fluid, Power . . . . . . . . . . . . . . . . . . 273
Wheel Adjustment . . . . . . . . . . . . . . 72
Stoplamps and Back-up Lamps
Bulb Replacement . . . . . . . . . . . . 297
Storage Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Storage Areas Glove Box . . . . . . . . . . . . . . . . . . . . . . 61
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Index 413
Storage Areas (cont'd)Information on Loading the
Vehicle . . . . . . . . . . . . . . . . . . . . . . . . 64
Instrument Panel . . . . . . . . . . . . . . . 61
Storage Compartments . . . . . . . . . . 60
Stuck Vehicle . . . . . . . . . . . . . . . . . . . 148
Sun Visors . . . . . . . . . . . . . . . . . . . . . . . 43
System Noise Control . . . . . . . . . . . . . . . . . 284
T
Tachometer . . . . . . . . . . . . . . . . . . . . . . 81
TaillampsBulb Replacement . . . . . . . . . . . . 297
Temperature, Operating . . . . . . . . 172
Text Telephone (TTY) Users . . . . 399
Three-Point Seat Belt . . . . . . . . . . . . 51
Tires If a Tire Goes Flat . . . . . . . . . . . . 326
Pressure . . . . . . . . . . . . . . . . . . . . . . 322
Rotation . . . . . . . . . . . . . . . . . . . . . . 323
Tires and Wheels . . . . . . . . . . . . . . . 308
Towing Vehicle . . . . . . . . . . . . . . . . . . . . . . . 332
Trademarks and License Agreements . . . . . . . . . . . . . . . . . . . 125
Transmission Automatic . . . . . . . . . . . . . . . . . . . . . 204
Fluid, Automatic . . . . . . . . . . . . . . 260 Transmission (cont'd)
Overdrive Off, Automatic . . . . . . 215
Service Warning Light . . . . . . . . . . 88
Trip Odometer . . . . . . . . . . . . . . . . . . . 80
Turn and Lane-Change
Signals . . . . . . . . . . . . . . . . . . . . . . . . 105
Turn Signal Bulb Replacement . . . . . . . . . . . . 297
U
USB Port . . . . . . . . . . . . . . . . . . . . . . . 121
Using This Manual . . . . . . . . . . . . . . . . 3
V
VehicleControl . . . . . . . . . . . . . . . . . . . . . . . 133
Getting In and Out . . . . . . . . . . . . . . 35
Identification Number (VIN) . . . 383
Messages . . . . . . . . . . . . . . . . . . . . . . 97
Security . . . . . . . . . . . . . . . . . . . . . . . . 39
Service Soon Light . . . . . . . . . . . . . 84
Starting and Stopping . . . . 165, 168
Towing . . . . . . . . . . . . . . . . . . . . . . . . 332
Vehicle Care
Tire Pressure . . . . . . . . . . . . . . . . . 322
Vehicle Data Recording and Privacy . . . . . . . . . . . . . . . . . . . . . . . . 405
Ventilation, Air . . . . . . . . . . . . . . . . . . 129
Visors . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
W
Wait to Start Light . . . . . . . . . . . . . . . 89
Warning Brake System Light . . . . . . . . . . . . . 84
Caution and Danger . . . . . . . . . . . . . 3
Warning Buzzers . . . . . . . . . . . . . . . 101
Warning Lights, Gauges, and Indicators . . . . . . . . . . . . . . . . . . . . . . 76
Warnings Hazard Flashers . . . . . . . . . . . . . . 105
Washer Fluid . . . . . . . . . . . . . . . . . . . 274
Water in Fuel . . . . . . . . . . . . . . . . . . . 236
Wheels and Tires . . . . . . . . . . . . . . . 308
Windows Power . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Windshield Wiper/Washer . . . . . . . . . . . . . . . . . . 73
Winter Driving . . . . . . . . . . . . . . . . . . . . . . . . 145
Winter Cover . . . . . . . . . . . . . . . . . . . 172
Wiper Blade Replacement . . . . . . 286