GMC T-Series 1999 Owner's Manual page 272

Scheduled Maintenance (Except DURAMAX
30,000 Miles (50 000 km) (Continued)
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Clutch pedal free travel service. (10)
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Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first). (40)
33,000 Miles (55 000 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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Clean air conditioner filter (or every month,
whichever occurs first). See "Air Conditioner Filter"
in the Index.
36,000 Miles (60 000 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.
7-10
t
DIESEL)
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Inspect door hinge pins and bushings and replace as
necessary. Lubricate door hinge pins and rollers with
engine oil.
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Replace air conditioning filter dryer (or every
18 months, whichever occurs first, and whenever
refrigerant charge is lost for any reason).
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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 brake caliper service (or every 6 months,
whichever occurs first). (22)
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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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