Service Schedule Maintenance Interval Operation
Maintenance Interval
Frequency Miles km Hours
Schedule I
*
(Severe Service)
vehicles that annually travel less
than 6000 miles (10 000 km)
Initial Maintenance (IM) first 1000 1600 50
Maintenance 1 (M1) every 1000 1600 50
Maintenance 2 (M2) every 5000 8000 500
Maintenance 3 (M3) every 15,000 24 000 1500
Schedule II
†
(Short-Haul Transport)
vehicles that annually travel less
than 60,000 miles (100 000 km)
Initial Maintenance (IM) first 10,000 16 000
—
Maintenance 1 (M1) every 10,000 16 000
Maintenance 2 (M2) every 50,000 80 000
Maintenance 3 (M3) every 150,000 240 000
Schedule III
†
(Long-Haul Transport)
vehicles that annually travel over
60,000 miles (100 000 km)
Initial Maintenance (IM) first 25,000 40 000
—
Maintenance 1 (M1) every 25,000 40 000
Maintenance 2 (M2) every 100,000 161 000
Maintenance 3 (M3) every 300,000 483 000
Schedule IV
†
(Long-Haul Transport for
Optimized Vehicle Configuration)
vehicles that annually travel over
60,000 miles (100 000 km)
Initial Maintenance (IM) first 25,000 40 000
—
Maintenance 1 (M1) every 25,000 40 000
Maintenance 2 (M2) every 100,000 161 000
Maintenance 3 (M3) every 300,000 483 000
*
For Schedule I (severe service) vehicles equipped with an hourmeter, use maintenance intervals based on hours of operation rather than distance traveled.
†
Use Schedule I (severe service) maintenance intervals for vehicles that operate under severe conditions, such as extremely poor roads, heavy dust accumu-
lation, extreme climate, frequent short distance travel, construction-site operation, city operation (garbage truck), or farm operation.
Table 1, Service Schedule
General Information00
Service Schedule Table: 00–02
Century Class Trucks Maintenance Manual, January 200700/2
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