Headlight Aim Adjusting
Notice: Do not use power tools to adjust headlight aim. Doing so will strip or break the adjusting screw.
Note: Western Star 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.
For adjustment screw locations on a vehicle with dual rectangular headlight assemblies, see Fig.. For adjustment screw locations on a vehicle with dual round headlight assemblies, see Fig.. For adjustment screw locations on a single rectangular headlight assembly, see Fig..
Turn the adjustment screw in either direction until the beam pattern meets the acceptable standard.
Table 1, Vertical Low-Beam Headlight Variation Limits
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Vertical Low-Beam Headlight Variation Limits |
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Distance Between Ground and Headlight: in (mm) |
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|
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
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Low-Beam Angle Upper Limit
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Ideal Low-Beam Projection
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Low-Beam Angle Lower Limit
Fig. 1, Vertical Low-Beam Headlight Variation Limits
Note: The vertical adjustment screws are on top of each bulb; the horizontal adjustment screws are on the side of each bulb.
Fig. 2, Adjustment Screw Locations, Dual Rectangular Headlights
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Horizontal Adjustment Screw
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Vertical Adjustment Screw
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Bezel Mounting Screw
Fig. 3, Adjustment Screw Locations, Dual Round Headlights
Note: Adjustment screw locations may vary.
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Headlight Lens
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Horizontal Adjusting Screw
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Turn Signal
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Vertical Adjusting Screw