Determining Scheduled Maintenance Intervals

Performing regular maintenance will help ensure that your vehicle delivers safe, reliable service and optimum 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 service 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 I-III

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. Examples of Schedule II usage are:

• operation primarily in cities and densely populated 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 kilometers) annually with minimal city or stop-and-go operation. Examples of Schedule lll usage are:

• regional delivery that is mostly freeway miles.

• interstate transport

• any road operation with high annual mileage

Maintenance Schedules

After determining the schedule appropriate to your vehicle, refer to the Maintenance Schedules to determine when to perform the Initial Maintenance (IM) and the frequency of performing subsequent maintenance intervals for each schedule.

Maintenance Intervals

Refer to Maintenance Intervals for Schedule I, Schedule II, and Schedule III to determine which maintenance interval(s) should be performed when your vehicle reaches the mileage or hours of operation listed in these tables.

Maintenance Operations

Groups 01 through 83 in this manual have an index at the beginning of each group. The index lists the title of maintenance operations and the Maintenance Operation (MOP) numbers 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 the daily maintenance procedures in General Information, "Pretrip Inspection and Daily Maintenance," in the SD Plus Driver's Manual.