GMC T-Series 1999 Owner's Manual page 274

Scheduled Maintenance (Except DURAMAX
45,000 Miles (75 000 km) (Continued)
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Air brake service (or every 6 months, whichever
occurs first). (39)
48,000 Miles (80 000 km)
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Engine oil and filter service. (3)(9)
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Check fluid levels (or every 3 months, whichever
occurs first). (1)(2)(6)
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Chassis lubrication service (or every 6 months,
whichever occurs first). (12)
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Clean air conditioner filter (or every month,
whichever occurs first). See "Air Conditioner Filter"
in the Index.
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Lubricate door hinge pins and rollers with engine oil.
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Wheel bearing (grease type) service (or every
24 months, whichever occurs first, and whenever
hubs are removed). (23)
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Wheels and tires service. (15)
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Hydraulic brake service (or every 6 months,
whichever occurs first). (7)
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Hydraulic parking brake service (or every 6 months,
whichever occurs first). (8)
7-12
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DIESEL)
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Engine drive belts service (or every 12 months,
whichever occurs first). (18)
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Clutch pedal free travel service. (10)
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Throttle linkage service. (19)
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Thermostatically controlled engine cooling fan
service. (4)(20)
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Shields and undercab insulation service. (4)(5)(21)
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Air intake system service (or every 24 months,
whichever occurs first). (4)(5)(24)
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Thermostatically controlled air cleaner service
(or every 24 months, whichever occurs first).
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(3)(4)(25)
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Evaporative Control System service (if equipped) (or
every 24 months, whichever occurs first). (3)(26)
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Rear axle air shift motor service. (11)
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Check air brake relay valve operation and check for
leaks (or every month, or every 300 hours,
whichever occurs first).
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Air brake chamber service (or every 2 months,
whichever occurs first). (41)
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Trailer brake hand control valve service (or every
3 months, or 900 hours, whichever occurs first). (42)
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