GMC T-Series 1999, Owner'S Manual

Page: 304 / 344

Scheduled Maintenance (DURAMAX
t
DIESEL)
yellow blue
7-42
78,000 Miles (124 800 km) (Continued)
j Spring
-
to
-
axle U
-
bolts and shackle bolts service. (16)
j Exhaust system service (or every month, whichever
occurs first). (3)(4)(17)
j Air brake service (or every 6 months, whichever
occurs first). (39)
j Wheel bearing service (or every 24 months, whichever
occurs first, and whenever hubs are removed). (23)
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 Engine drive belts service (or every 6 months,
whichever occurs first). (18)
j Clutch pedal free travel service. (10)
j Lubricate clutch shift block (or every month,
whichever occurs first).
j Throttle linkage service. (19)
j Thermostatically controlled engine cooling fan
service. (4)(20)
j Shields and undercab insulation service (or every
month, whichever occurs first). (4)(5)(21)
j Air intake system service (or every 24 months,
whichever occurs first). (4)(5)(24)
j Replace fuel filter (or every 6 months, whichever
occurs first). (3)
j Fuel tank, fuel cap and fuel lines service (or every
72 months, whichever occurs first). (3)(30)
j Air cleaner filter replacement service (or every
24 months, whichever occurs first). (3)(4)(27)
j Rear axle air shift motor service. (11)
j Check air brake relay valve operation and check for
leaks (or every month, or every 300 hours,
whichever occurs first).
j Clean air brake application valve (or every 3 months,
or every 300 hours, whichever occurs first);
lubricate linkage.
j Air brake chamber service (or every 2 months,
whichever occurs first). (41)