GMC T-Series 1999 Owner's Manual page 291

Scheduled Maintenance (DURAMAX
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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)
9,750 Miles (15 600 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).
t
DIESEL)
13,000 Miles (20 800 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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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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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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Replace fuel filter (or every 6 months, whichever
occurs first).
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(Continued)
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