GMC T-Series 1999, Owner'S Manual, Page: 281 / 344

yellow blue
Scheduled Maintenance (Except DURAMAX
t
DIESEL)
7-19
j Replace fuel filter(s) (or every 12 months, whichever
occurs first). (3)
j Air cleaner filter replacement service (or every
24 months, whichever occurs first). (3)(4)(27)
j Steering system service. (13)
j Front and rear suspension service. (14)
j Spring
-
to
-
axle U
-
bolts and shackle bolts
service. (16)
j Exhaust system service (or every 6 months,
whichever occurs first). (3)(4)(17)
j Air brake service (or every 6 months, whichever
occurs first). (39)
j Inspect door hinge pins and bushings and replace as
necessary. Lubricate door hinge pins and rollers with
engine oil.
j Replace air conditioning filter dryer (or every
18 months, whichever occurs first, and whenever
refrigerant charge is lost for any reason).
j Wheels and tires service. (15)
j Hydraulic brake service (or every 6 months,
whichever occurs first). (7)
j Hydraulic brake caliper service (or every 6 months,
whichever occurs first). (22)
j Hydraulic parking brake service (or every 6 months,
whichever occurs first). (8)
j Clutch pedal free travel service. (10)
j Air brake automatic slack adjuster service (or every
500 hours, whichever occurs first). (40)
j Clean air brake application valve (or every 3 months,
or every 300 hours, whichever occurs first);
lubricate linkage.
93,000 Miles (155 000 km)
j Engine oil and filter service. (3)(9)
j Check fluid levels (or every 3 months, whichever
occurs first). (1)(2)(6)
j Clean air conditioner filter (or every month,
whichever occurs first). See “Air Conditioner Filter”
in the Index.