GMC T-Series 1999 Owner's Manual page 292

Scheduled Maintenance (DURAMAX
13,000 Miles (20 800 km) (Continued)
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Exhaust system service (or every month, whichever
occurs first). (3)(4)(17)
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Air brake service (or every 6 months, whichever
occurs first). (39)
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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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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 (or every
month, whichever occurs first). (4)(5)(21)
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Check air brake relay valve operation and check for
leaks (or every month, or every 300 hours,
whichever occurs first).
7-30
t
DIESEL)
16,250 Miles (26 000 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).
19,500 Miles (31 000 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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