GMC 2010 T-Series Owner's Manual page 254

1 Wheels and tires service. (13)
1 Hydraulic brake service (or every 6 months,
whichever occurs first). (6) (30)
1 Parking brake service (or every 6 months,
whichever occurs first). (7)
1 Air brake service (or every 6 months, whichever
occurs first). (26)
1 Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first). (27)
1 Check air brake relay valve operation and check
for leaks (or every month, or every 300 hours,
whichever occurs first).
1 Clean air brake application valve (or every
3 months, or every 300 hours, whichever occurs
first). Lubricate linkage.
1 Air brake chamber service (or every 2 months,
whichever occurs first). (28)
1 Air brake system valve service (or every 3 months,
or every 900 hours, whichever occurs first). (31)
1 Air compressor dry element pleated paper air
strainer service (or every 2 months, or every
800 hours, whichever occurs first).
1 Thermostatically controlled engine cooling fan
service. (3) (17)
6-16
1 Shields and underhood insulation
service. (3) (4) (18)
1 Rear axle air shift motor service. (9)
1 Air intake system service (or every 24 months,
whichever occurs first). (3) (4) (20)
152 000 km (96,000 Miles)
1 Lubricate U-joints (or every 6 months, whichever
occurs first).
156 000 km (97,500 Miles)
1 Check fluid levels (or every 3 months, whichever
occurs first). (1) (5)
1 Chassis lubrication service (or every 6 months,
whichever occurs first). (10)
1 Wheels and tires service. (13)
160 000 km (100,000 Miles)
1 Inspect engine drive belt; replace as necessary.
1 Change power steering fluid (or every 36 months,
whichever occurs first). (11)
1 Replace power steering reservoir filter element
(or every 24 months, whichever occurs first).
1 Wheel bearing (oil type) service (and whenever
hubs are removed). (19) (30)