Chevrolet 2005 T-Series Owner's Manual page 249

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)
Air brake system valve service (or every 3 months,
or every 900 hours, whichever occurs first). (31)
Rear axle air shift motor service. (9)
Air intake system service (or every 24 months,
whichever occurs first). (3) (4) (20)
72,000 Miles (115 000 km)
Vehicles Without Engine Oil Life System
Only: Change engine oil and filter
(or every 12 months, or every 600 hours
of engine operation, whichever occurs first).(2)
Vehicles With Engine Oil Life System Only: Check oil
life system (or every 600 hours of engine operation,
whichever occurs first). If engine oil and filter are
changed, reset system. See Engine Oil Life System
on page 5-18. (2) (8)
75,000 Miles (120 000 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)
6-13