GMC TopKick 2007 Owner's Manual page 382

Clean air brake application valve (or every
3 months, or every 300 hours, whichever
occurs first). Lubricate linkage.
Air brake chamber service (or every 2 months,
whichever occurs first). (34)
100,000 Miles (160 000 km)
Diesel Only: Inspect engine drive belt; replace
as necessary.
Gasoline Engine Only (Vehicles with GVW
of 16,000 lbs or less): Spark plug
service. (2) (25)
Change power steering fluid (or every
36 months, whichever occurs first). (12)
Replace power steering reservoir filter element
(or every 24 months, whichever occurs first).
Wheel bearing (oil type) service (and whenever
hubs are removed). (22) (36)
Except four-wheel drive: Front axle service. (31)
Four-wheel drive only: Front axle service. (30)
Four-wheel drive only: Transfer case
service. (30)
Rear axle service — Eaton
®
Spicer axles (or every 12 months, whichever
occurs first). (30)
382
® ®
, Rockwell ,
Exhaust brake service, if equipped. Check for
excessive spindle free play and smooth
operation. Lubricate ball joint cap.
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).
Trailer brake hand control valve service (or every
12 months, or every 3,600 hours, whichever
occurs first). (35)
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). (17)
150,000 Miles (240 000 km)
Cooling system service (or every 60 months
since last service, whichever occurs
first). (2) (29)
Diesel Engine Only: Inspect engine drive belt;
replace as necessary.