Determining Scheduled
Maintenance Intervals
Performing regular maintenance will help ensure that
your vehicle delivers safe, reliable service and opti-
mum performance. A proper maintenance program
will also help to minimize downtime and safeguard
warranties.
To determine the correct maintenance intervals for
your vehicle, you must first determine the type of ser-
vice or conditions the vehicle will be operating in.
Most vehicles operate in conditions that fall within
one of two schedules. Before placing your vehicle in
service, determine which schedule applies to your
vehicle.
Schedules
Schedule I (severe service) applies to vehicles that
travel up to 6,000 miles (10,000 kilometers) annually
or that operate under severe conditions. Examples of
Schedule I usage are:
• operation on extremely poor roads or where
there is heavy dust accumulation
• constant exposure to extreme hot, cold, salt air,
or other extreme climates
• frequent short-distance travel
• construction-site operation
• city operation such as fire truck and garbage
truck.
• farm operation
Schedule II (short-haul transport) applies to vehicles
that travel 6,000 miles (10,000 kilometers) or more
annually and operate under normal conditions. Ex-
amples of Schedule II usage are:
• operation primarily in cities and densely popu-
lated areas
• local transport with infrequent freeway travel
• high percentage of stop-and-go travel
Schedule lll (long-haul transport) applies to vehicles
that travel more than 60,000 miles (100,000 kilome-
ters) annually with minimal city or stop-and-go opera-
tion. Examples of Schedule lll usage are:
• regional delivery that is mostly freeway miles.
• interstate transport
• any road operation with high annual mileage
Maintenance Intervals
After determining the schedule appropriate to your
vehicle, refer to Table 1 to determine when to per-
form the Initial Maintenance (IM) and the frequency
of performing subsequent maintenance intervals for
each schedule.
Maintenance Operations
This manual has an index at the beginning of each
Group that lists the title and number of each mainte-
nance operation (MOP) for that Group. Follow the
instructions under the MOP number to perform the
required maintenance.
In addition to the maintenance operations required
for the maintenance interval, perform all daily,
weekly, and monthly maintenance operations listed in
Chapter 21, "Pretrip and Post-Trip Inspections and
Maintenance", of the 108SD and 114SD Driver’s
Manual.
General Information 00
00–01 Determining Scheduled Maintenance Intervals
108SD and 114SD Maintenance Manual, April 2021 00/1
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