Scheduled Maintenance Chart - Hummer H1 Service Manual

1-22 General Information, Lubrication and Maintenance
Maintenance Inspection Group B:
• Inspect fuel injection pump, lines, and fittings for leaks or
damage.
• Check battery voltage and condition.
• Inspect serpentine belt condition.
• Inspect exhaust system and shields.
• Inspect and rotate tires.
• Inspect halfshaft boots and ball joint seals.
• Inspect condition of steering column, U-joints, tie rods,
steering arm, center link, and idler arm.
• Check fuel tank vent line filter.
• Inspect condition of frame rails and crossmembers.
• Check A/C system operation.
• Check wheel alignment.
Maintenance Inspection Group C:
• Inspect surge tank, radiator and shroud, A/C condenser,
power steering and transmission coolers, and all hoses and
fittings for security of mounting, leaks, obstructions, or
damage.
• Inspect fuel tank, lines, and cap.
• Inspect all wiring harnesses for frays, splits, missing insu-
lation, poor connections.
• Inspect power steering pump, power steering gear, hoses,
lines, and fittings for leaks or damage.
NOTES
Clean all dirt from caps and surrounding areas before opening
to check fluids.
3-1-01

SCHEDULED MAINTENANCE CHART

3,000 Miles (4,800 km)
100 hrs normal use or 50 hrs severe operation
Change engine oil and replace filter.
Check items in Maintenance Group A.
6,000 Miles (9,700 km)
200 hrs normal use or 100 hrs severe operation
Change engine oil and replace filter.
Clean or replace air filter.
Replace fuel filter element.
Check items in Maintenance Groups A and B.
9,000 Miles (14,500 km)
300 hrs normal use or 150 hrs severe operation
Change engine oil and replace filter.
Check items in Maintenance Group A.
12,000 Miles (19,300 km)
400 hrs normal use or 200 hrs severe operation
Change engine oil and replace filter.
Clean or replace air filter.
Replace fuel filter element.
Change geared hub oil.
Change axle oil.
Change engine coolant.
Change transmission and transfer case fluid.
Change transmission filter.
Check items in Maintenance Groups A, B, and C.
15,000 Miles (24,100 km)
500 hrs normal use or 250 hrs severe operation
Change engine oil and replace filter.
Check items in Maintenance Group A.
18,000 Miles (29,000 km)
600 hrs normal use or 300 hrs severe operation
Change engine oil and replace filter.
Clean or replace air filter.
Replace fuel filter element.
Check items in Maintenance Groups A and B.
21,000 Miles (33,800 km)
700 hrs normal use or 350 hrs severe operation
Change engine oil and replace filter.
Check items in Maintenance Group A.
24,000 Miles (38,600 km)
800 hrs normal use or 400 hrs severe operation
Change engine oil and replace filter.
Clean or replace air filter.
Replace fuel filter element.
Change engine coolant.
Change transmission and transfer case fluid.
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