GMC T-Series 1999 Owner's Manual page 276

Scheduled Maintenance (Except DURAMAX
60,000 Miles (100 000 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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Replace fuel filter(s) (or every 12 months, whichever
occurs first). (3)
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Air cleaner filter replacement service (or every
24 months, whichever occurs first). (3)(4)(27)
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Steering system service. (13)
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Front and rear suspension service. (14)
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- - -
Spring to axle U bolts and shackle bolts
service. (16)
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Exhaust system service (or every 6 months,
whichever occurs first). (3)(4)(17)
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Air brake service (or every 6 months, whichever
occurs first). (39)
7-14
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DIESEL)
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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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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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Positive Crankcase Ventilation (PCV) system service
(or every 60 months, whichever occurs first). (3)(33)
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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 automatic slack adjuster service (or every
500 hours, whichever occurs first). (40)
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