Scheduled Maintenance - GMC 2003 GMT560 T-Series Owner's Manual

Scheduled Maintenance

The services shown in this schedule up to 100,000 miles
(166 000 km) should be repeated after 100,000 miles
(166 000 km) at the same intervals for the life of
this vehicle. The services shown after 100,000 miles
(166 000 km) should be repeated at the same miles (km)
after those intervals for the life of this vehicle.
The "Footnotes" at the end of this Maintenance
Schedule further explain maintenance services.
See Service Publications Ordering Information on
page 7-6 .
100 Miles (160 km)
Wheel stud nut service. (46)
1,000 Miles (1 600 km)
Wheel stud nut service. (46)
Rear axle air shift motor service. (11)
7,500 Miles (12 000 km)
Check fluid levels (or every 3 months, whichever
occurs first). (1) (6)
Chassis lubrication service (or every 6 months,
whichever occurs first). (12)
Wheels and tires service. (15)
Hydraulic brake service (or every 6 months,
whichever occurs first). (7) (46)
Parking brake service (or every 6 months, whichever
occurs first). (8)
Air brake service (or every 6 months, whichever
occurs first). (39)
Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first). (40)
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). (41)
Trailer brake hand control valve service (or every 3
months, or every 900 hours, whichever occurs
first). (42)
10,000 Miles (16 000 km)
Change engine oil and filter (or every 12 months,
whichever occurs first). (2) (3)
6-5