freightliner 108SD, Driver Manual

Page: 178 / 192

7. Use Table 23.1 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 23.1 , 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. 23.3 . Turn
the adjusting screw clockwise to raise the beam and
counterclockwise to lower it, until the beam pattern
meets the acceptable standard.
Vertical Low-Beam Headlight Variation Limits
Distance Between Ground
and Headlight: in (mm)
Desired Variation ( Fig. 23.2 ,
Item 2) : in (mm)
Upper Limit ( Fig. 23.2 , Item
1): in (mm) up
Lower Limit ( Fig. 23.2 , 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) 2.5 (64) down 1.6 (40) 6.5 (165)
Table 23.1, Vertical Low-Beam Headlight Variation Limits
11/03/2011 f545851
A
1
2
3
1. Low-Beam Angle Upper Limit
2. Ideal Low-Beam Projection
3. Low-Beam Angle Lower Limit
Fig. 23.2, Vertical Low-Beam Headlight Variation Limits
Headlight Aiming
23.2