Types of Service

Service Schedule I (severe service) applies to vehicles that annually travel less than 6000 miles (10 000 kilometers) or that operate under severe conditions. Examples of severe service, Schedule I usage include: 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 (fire truck); or farm operation.

Service Schedule II (short-haul transport) applies to vehicles that annually travel less than 60,000 miles (100 000 kilometers) 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; or high percentage of stop-and-go travel.

Service Schedule III (long-haul transport) is for vehicles that annually travel more than 60,000 miles (100 000 kilometers) with minimal city or stop-and-go operation. Examples of Schedule III usage are: regional delivery that is mostly freeway miles; interstate transport; or any road operation with high annual mileage.

Service Schedule IV (long haul transport for Optimized Vehicle Configuration) is for vehicles that annually travel over 60,000 miles (100 000 km) and meet the following qualifications:

• Meritor 15-1/2 inch dampened/ceramic Lite Pedal LTD clutch with sealed release bearing.

• Synthetic transmission fluid used in transmission.

• Meritor FF–961 or FF–981 front axle (12,000 lb. capacity) with synthetic lubricant.

• Front suspension with maintenance-free rubber bushings for 12,000 lb. capacity suspension.

• Meritor RPL series, or Spicer SPL series driveline U-joints.

• Synthetic lubricant used in rear axle.

• Equipped with any Freightliner AirLiner suspension.

• Equipped with Meritor Q-Plus extended-lube cam brakes and automatic slack adjusters, front and rear.

• Standard brake system package including Bendix AD-9 air dryer—mounted on the right-hand frame rail, located directly behind the front bumper—with heater, and a Bendix air compressor.

• TRW TAS–65 power steering.