Chevrolet 2005 T-Series Owner's Manual page 246

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)
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)
Air brake system valve service (or every 3 months,
or every 900 hours, whichever occurs first). (31)
6-10
Thermostatically controlled engine cooling fan
service. (3) (17)
Shields and underhood insulation service. (3) (4) (18)
Rear axle air shift motor service. (9)
Air intake system service (or every 24 months,
whichever occurs first). (3) (4) (20)
Air compressor dry element pleated paper air strainer
service (or every 2 months or every 800 hours,
whichever occurs first).
48,000 Miles (75 000 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)
50,000 Miles (80 000 km)
Inspect air compressor discharge port
(or every 6 months or every 1,800 hours,
whichever occurs first.)