Chevrolet kodiak 2004 Owner's Manual page 328

Replace power steering reservoir filter element (or
every 24 months, whichever occurs first).
Front axle service. (38)
Rear axle service – Eaton, Rockwell, Spicer Axles
(or every 12 months, whichever occurs first). (37)
Exhaust brake service (if equipped). Check for
excessive spindle free play and smooth operation.
Lubricate ball joint cap.
Air compressor dry element pleated paper air strainer
service (or every 2 months or every 800 hours,
whichever occurs first).
Inspect air compressor discharge port (or every
6 months or every 1,800 hours, whichever occurs
first).
Manual transmission (ZF 6–speed only) fluid
replacement (or every 48 months, whichever
occurs first).
120,000 Miles (192 000 km)
C600, C700 and C800 Gasoline Engines Only:
Replace engine drive belts.
C400 and C500 Gasoline Engines Only: Engine drive
belts service (or every 12 months, whichever occurs
first). (18)
6-18
150,000 Miles (240 000 km)
Cooling system service (or every 60 months since
last service, whichever occurs first). (3) (35)
Diesel Engine Only: Inspect engine drive belt;
replace as necessary.
200,000 Miles (320 000 km)
Remove, disassemble, clean and inspect the air
brake trailer supply valve (or every 2 years, or
every 7,200 hours, whichever occurs first).
Diesel Engine Only: Inspect engine drive belt;
replace as necessary.
250,000 Miles (400 000 km)
Rear axle service – Eaton, Rockwell, Spicer Axles
(or every 36 months, whichever occurs first). (37)
Manual transmission (except ZF 6-speed) fluid
replacement (or every 60 months, whichever
occurs first).