GMC 2003 C4C042 Owner's Manual page 361

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Exhaust brake service (if equipped). Check for
excessive spindle free play and smooth operation.
Lubricate ball joint cap.
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Air compressor dry element pleated paper air strainer
service (or every 2 months or every 800 hours,
whichever occurs first).
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Inspect air compressor discharge port (or every
6 months or every 1,800 hours, whichever
occurs first).
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Manual transmission (ZF 6
replacement (or every 48 months, whichever
occurs first).
120,000 Miles (192 000 km)
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C600, C700 and C800 Gasoline Engines Only:
Replace engine drive belts.
150,000 Miles (240 000 km)
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Cooling system service (or every 60 months since
last service, whichever occurs first). (3)(35)
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Diesel Engine Only: Inspect engine drive belt;
replace as necessary.
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speed only) fluid
200,000 Miles (320 000 km)
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Remove, disassemble, clean and inspect the air
brake trailer supply valve (or every 2 years, or
every 7,200 hours, whichever occurs first).
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Diesel Engine Only: Inspect engine drive belt;
replace as necessary.
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C400 and C500 Gasoline Engines Only: Inspect
drive belts; replace as necessary. (18)
250,000 Miles (400 000 km)
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Wheel bearings service
every 36 months, whichever occurs first). (23)(46)
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Rear axle service Eaton, Rockwell, Spicer Axles
(or every 36 months, whichever occurs first). (37)
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Manual transmission (except ZF 6
replacement (or every 60 months, whichever
occurs first).
300,000 Miles (480 000 km)
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Remove, disassemble, clean and inspect the air brake
air dryer (or every 3 years, or 10,800 hours,
whichever occurs first). Replace dessicant on
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Bendix Westinghouse units.
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Eaton Axle (oil filled) (or
-
speed) fluid
7-15