Adjusting Headlight Aim

m2 dm 14.02.001

    Notice: Do not use power tools to adjust headlight aim. Doing so will strip or break the adjusting screw.

    Note: Freightliner vehicles are offered with various headlight assembly options. Because of the various options, the location of adjustment screws on the vehicle's headlight assembly may vary from what is shown here.

  1. Lift the flap over the rear end of the headlight bucket to expose the two plastic adjusting knobs on each headlight. See Fig..

    Note: The right-hand side headlight bucket is shown. The left-hand side is opposite.

    1. Horizontal (inboard) Adjusting Knob

    2. Vertical (outboard) Adjusting Knob

    Fig. 1, Headlight Adjusting Knobs

  2. If necessary, adjust the horizontal positioning of the headlights so that each projection points directly forward.
  3. Turn the vertical adjustment knob to adjust the headlight beam to meet the desired height. See Table.. Turn the knob clockwise to raise the beam; turn the knob counterclockwise to lower it.
  4. Adjust the other headlight.

    Table 1, Vertical Low-Beam Headlight Variation Limits

    Vertical Low-Beam Headlight Variation Limits

    Distance Between Ground and Headlight: in (mm)

    Desired Variation (Fig., Item 2): in (mm)

    Upper Limit (Fig., Item 1): in (mm) up

    Lower Limit (Fig., Item 3): in (mm) down

    22–36 (560–900)

    0

    3.9 (100)

    3.9 (100)

    36–48 (900–1200)

    2 (50) down

    2 (50)

    6 (150)

    48–54 (1200–1400)

    4 (101.6) down

    1.6 (40)

    6.5 (165)

      Table 1, Vertical Low-Beam Headlight Variation Limits

      1. Low-Beam Angle Upper Limit

      2. Ideal Low-Beam Projection

      3. Low-Beam Angle Lower Limit

      Fig. 2, Vertical Low-Beam Headlight Variation Limits

    Note:
    Parent topic: Headlight Aiming
    Document Number: 0000117734
    Manual Publication Date: 2025-02-11
    Topic Publication Date: 2024-05-09