Preliminary Checks
Before checking or adjusting the headlight aim, com-
plete the following inspection:
•
Check that the hood is closed and latched.
•
Remove any large amounts of mud or ice from
the underside of the fenders.
•
Check the springs for sagging or broken
leaves.
•
Check the suspension for proper functioning of
the leveling mechanism. If the vehicle is
equipped with an air suspension, make sure
that the height is properly adjusted.
•
Check for damage to the hood and hinge as-
sembly. Repair as necessary.
•
With the vehicle unloaded, check that the tires
are inflated to the recommended air pressure.
•
Clean the headlight lenses. Use a soft cloth
with mild, non-caustic soap or detergent, and
water.
Checking Headlight Aim
1.
Park the vehicle on a level surface, 25 ft (7.6 m)
away from, and perpendicular to, a vertical
screen or wall. Shut down the engine and set the
parking brake. Chock the tires.
2.
Each headlight has a height adjusting dot. See
Fig. 22.1. Measure the distance from the ground
to the height adjusting dot on each headlight
(
Fig. 22.2, Item A). Note those distances.
3.
On the screen or wall, mark the locations of each
headlight bulb center using the distances found
in step 2. See
Fig. 22.2, Items 2 and 3.
4.
Turn on the low-beam headlights.
5.
Check the vertical adjustment of the low beams.
The center of each beam projection should fall
on or near the marks made during step 3. See
Fig. 22.3.
6.
Use Table 22.1 to determine the maximum verti-
cal distance allowable between the marks on the
wall and the center of each low-beam projection.
If the distance between either projection center
and the mark made on the wall or screen is
greater than the maximum distance given in
Table 22.1, adjust the vertical positioning of that
headlight.
Adjusting Headlight Aim
NOTE: Freightliner vehicles are offered with
various headlight assembly options. Because of
the various options, the location of adjustment
screws on your vehicle’s headlight assembly
may vary from what is shown here.
The adjusting screw is located on the upper inboard
corner of the headlight assembly. See
Fig. 22.4. Turn
the adjusting screw clockwise to raise the beam and
counterclockwise to lower it, until the beam pattern
meets the acceptable standard.
01/23/2012 f545870
Measure beam height from the ground to the small dot
roughly in the center of the headlight lens.
Fig. 22.1, Headlight Beam Height Adjusting Dot
Headlight Aiming
22.1
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