GMC T-Series 1999, Owner'S Manual, Page: 293 / 344

yellow blue
Scheduled Maintenance (DURAMAX
t
DIESEL)
7-31
j Lubricate steering column shaft (or every 3 months,
whichever occurs first).
j Inspect door hinge pins and bushings and replace as
necessary. Lubricate door hinge pins and rollers with
engine oil.
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 Lubricate clutch shift block (or every month,
whichever occurs first).
j Shields and undercab insulation service (or every
month, whichever occurs first). (4)(5)(21)
j Clean air brake application valve (or every 3 months,
or every 300 hours, whichever occurs first);
lubricate linkage.
22,750 Miles (36 400 km)
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.
j Lubricate clutch shift block (or every month,
whichever occurs first).
26,000 Miles (41 600 km)
j Change engine oil and filters (or every 3 months,
whichever occurs first). (3)(9)
j Check fluid levels (or every 3 months, whichever
occurs first). (1)(2)(6)
j Chassis lubrication service (or every 6 months,
whichever occurs first). (12)
j Clean air conditioner filter (or every month,
whichever occurs first). See “Air Conditioner Filter”
in the Index.
j Lubricate water pump (or every 3 months, whichever
occurs first).
(Continued)