Chevrolet 2005 T-Series Owner's Manual page 242

15,000 Miles (24 000 km)
Inspect engine air cleaner filter change indicator. If
necessary, replace the filter. If vehicle is driven in
dusty/dirty conditions, inspect filter change indicator
at every engine oil change. See Engine Air
Cleaner/Filter on page 5-19 for more information.
An Emission Control Service. (See footnote †.)
Chassis lubrication service (or every 6 months,
whichever occurs first).(10)
Check fluid levels (or every 3 months, whichever
occurs first). (1) (5)
Replace fuel filter (or every 750 hours of engine
operation, whichever occurs first).
Steering system service. (11)
Front and rear suspension service. (12)
Spring-to-axle U-bolts and shackle bolts service. (14)
Exhaust system service (or every 6 months,
whichever occurs first). (2) (3) (15)
Wheels and tires service. (13)
Hydraulic brake service (or every 6 months,
whichever occurs first). (6) (30)
6-6
Parking brake service (or every 6 months, whichever
occurs first). (7)
Air brake service (or every 6 months, whichever
occurs first). (26)
Air brake automatic slack adjuster service
(or every 500 hours, whichever occurs first). (27)
Check air brake relay valve operation and check for
leaks (or every month, or every 300 hours, whichever
occurs first).
Clean air brake application valve (or every 3 months,
or every 300 hours, whichever occurs first).
Lubricate linkage.
Air brake chamber service (or every 2 months,
whichever occurs first). (28)
Thermostatically controlled engine cooling fan
service. (3) (17)
Shields and underhood insulation service. (3) (4) (18)
Air compressor dry element pleated paper air
strainer service (or every 2 months or every
800 hours, whichever occurs first).