Inspection of the Cab

4900 dm 23.02.005(a)
    Warning: When cleaning windshields and windows, always stand on the ground or on a secure ladder or platform. Use a long-handled window cleaner. Do not use the cab steps, tires, fenders, fuel tanks, engine, or under-hood components to access the windshield or windows. Doing so could cause a fall and result in an injury.
  1. Inspect the mirrors, window glass, and windshield for cracks or other damage.
  2. Ensure that the horn, windshield wipers, and windshield washers are operating properly. These devices must be in good working order for safe vehicle operation.
  3. Ensure the heater and defroster are operating properly.
  4. Check the operation of all interior lights.
    1. Turn on the headlights and leave them on. Ensure all equipped gauge bulbs illuminate in the dash message center.
    2. Ensure all equipped driver control switches illuminate.
    3. Ensure both turn signal indicator bulbs illuminate in the dash message center when the turn signal switch is activated.
  5. Check the operation of all exterior lights. See Fig. .

    1. Clearance Lights

    2. Turn Signal LIght

    3. Headlight

    4. Driving/Fog Lights

    5. Marker Lights

    Fig. 1, Exterior Lights (WST)

    1. Activate the high-beam headlights and hazard warning lights.
    2. Exit the cab and check that all exterior lights and reflectors are clean and intact.
    3. Check that the brake lights, taillights, headlights, turn signals, marker lights, identification lights, and clearance lights are working properly.
    6. Warning: Inspect and maintain seat belts. When any part of a seat belt system needs replacement, the entire seat belt must be replaced, both retractor and buckle side. Any time a vehicle is involved in an accident, and the seat belt system was in use, the entire vehicle seat belt system must be replaced before operating the vehicle. Do not attempt to modify the seat belt system; doing so could change the effectiveness of the system. Failure to replace worn or damaged seat belts, or making any modifications to the system, may result in personal injury or death.
  6. Inspect the seat belts and tether belts.
    1. Check the web for fraying, cuts, extreme dirt and dust, or for severe fading from exposure to sunlight, especially near the buckle latch plate and in the D-loop guide area.
    2. Check operation of the buckle, latch, Komfort Latch or Sliding Komfort Latch (if equipped), web retractor, and upper seat belt mount on the door pillar. Check all visible components for wear or damage.
    3. Check the seat belt and tether belt connection points and tighten any that are loose.

    7. Warning: Never fill fuel tanks to more than 95 percent of their liquid capacity. This could make them more likely to rupture from impact, possibly causing fire and resulting in serious personal injury or death by burning.

    Do not mix gasoline or alcohol with diesel fuel. This mixture could cause an explosion, possibly resulting in serious personal injury or death. Do not fill the fuel tanks in the presence of sparks, open flames, or intense heat. These could ignite the fuel, possibly causing severe burns.

    Important: On engines that comply with EPA07 or newer regulations, use ultralow-sulfur diesel (ULSD) with 15 ppm sulfur content or less. Failure to use ULSD fuel may void the warranty on emission components.
  7. Check the fuel level in the fuel tank(s). To keep condensation to a minimum, fuel tanks should be filled at the end of each day.
  8. Adjust the rearview and down view mirrors as necessary.
  9. Test the service brakes.
    1. With the engine running and air system fully charged, set the parking brake.
    2. Put the vehicle in the lowest gear and gently attempt to move it forward. The vehicle should not move.
    3. If the vehicle moves, the parking brakes are not operating correctly and must be repaired before the vehicle is operated.
  10. Test the backup alarm.
    1. Release the parking brake and put the transmission in reverse.
    2. Move the vehicle slightly backward to ensure that the backup alarm is operating correctly.
Note:
INSPECT
Parent topic: Monthly Post-Trip Inspection and Maintenance
Document Number: 0000211510
Manual Publication Date: 2024-06-10
Topic Publication Date: 2026-01-15