GMC 2003 GMT560 T-Series, Owner'S Manual

Page: 240 / 284

15,000 Miles (24 000 km)
❑
Inspect engine air cleaner filter change indicator. If
necessary, replace the filter. If vehicle is driven in
dusty/dirty conditions, inspect filter change indicator
at every engine oil change. See
Engine Air
Cleaner/Filter on page 5-12 for more information. An
Emission Control Service. (See footnote †.)
❑
Chassis lubrication service (or every 6 months,
whichever occurs first).
(12)
❑
Check fluid levels (or every 3 months, whichever
occurs first).
(1) (6)
❑
Replace fuel filter. (3)
❑
Steering system service.
(13)
❑
Front and rear suspension service. (14)
❑
Spring-to-axle U-bolts and shackle bolts service.
(16)
❑
Exhaust system service (or every 6 months,
whichever occurs first).
(3) (4) (17)
❑
Wheels and tires service. (15)
❑
Hydraulic brake service (or every 6 months,
whichever occurs first).
(7) (46)
❑
Parking brake service (or every 6 months, whichever
occurs first).
(8)
❑
Air brake service (or every 6 months, whichever
occurs first).
(39)
❑
Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first).
(40)
❑
Check air brake relay valve operation and check for
leaks (or every month, or every 300 hours, whichever
occurs first).
❑
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).
(41)
❑
Trailer brake hand control valve service (or every
3 months, or every 900 hours, whichever occurs
first).
(42)
❑
Thermostatically controlled engine cooling fan
service.
(4) (20)
❑
Shields and underhood insulation service. (4) (5) (21)
20,000 Miles (32 000 km)
❑
Change engine oil and filter (or every 12 months,
whichever occurs first).
(2) (3)
❑
Air compressor dry element pleated paper air strainer
service (or every 2 months or every 800 hours,
whichever occurs first).
6-6