General Information 00 Determining Scheduled Maintenance Intervals: 00–01 Determining Scheduled Maintenance Intervals km) annually with minimal city or stop-and-go opera- tion. Examples of Service Schedule II usage are: regional delivery that is mostly freeway miles Performing regular maintenance will help ensure that your Western Star vehicle delivers safe, reliable ser- vice and optimum performance for years to come. Failure to follow a regular maintenance program can result in inefficient operation and unscheduled down- time. interstate transport any highway operation with high annual mileage NOTE:
Maintenance instructions in this manual are based on average vehicle use and normal operating conditions. Unusual vehicle operating conditions may require service at more frequent intervals. To determine the correct maintenance intervals for your vehicle, you must first determine the type of ser- vice or conditions in which the vehicle will be operat- ing. Generally, most vehicles operate under condi- tions that fall within one of the two types of service described. Before placing your new vehicle in ser- vice, determine the type of service (Service Schedule I or II) that applies to the intended use of the vehicle.
After determining the vehicle’s type of service, refer to the Maintenance Service Table ( 00–02 ) or the Ve- hicle Maintenance Schedule Tables ( 00–03 ) to deter- mine how often maintenance should be performed. When the vehicle reaches the distance given for a maintenance interval, see the applicable Mainte- nance Interval Operations Table for a list of the main- tenance operations to be performed at that mainte- nance interval. Use the maintenance operation numbers to find detailed instructions in the manual on each operation.
Types of Service Service Schedule I (severe service) applies to ve- hicles that travel less than 60,000 miles (100 000 km) annually or that operate under severe conditions. Examples of Service 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 or garbage truck logging farm operation Service Schedule II (long-haul transport) applies to vehicles that travel more than 60,000 miles (100 000 Western Star Maintenance Manual, September 2015 00/1