GMC T-Series 1999 Owner's Manual page 305

Scheduled Maintenance (DURAMAX
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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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Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first). (40)
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Check starter brushes for wear (or every 12 months,
whichever occurs first). Replace as needed.
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Check generator brushes for wear (or every
12 months, whichever occurs first). Replace as needed.
81,250 Miles (130 000 km)
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Check fluid levels (or every 3 months, whichever
occurs first). (1)(2)(6)
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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 clutch shift block (or every month,
whichever occurs first).
84,500 Miles (135 200 km)
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Change engine oil and filters (or every 3 months,
whichever occurs first). (3)(9)
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Check fluid levels (or every 3 months, whichever
occurs first). (1)(2)(6)
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DIESEL)
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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 water pump (or every 3 months, whichever
occurs first).
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Lubricate steering column shaft (or every 3 months,
whichever occurs first).
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Lubricate door hinge pins and rollers with engine oil.
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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)
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Clutch pedal free travel service. (10)
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Lubricate clutch shift block (or every month,
whichever occurs first).
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Shields and undercab insulation service (or every
month, whichever occurs first). (4)(5)(21)
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