Preliminary Checks

Before checking or adjusting the headlight aim, complete 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. On cabs with air suspensions, make sure that the height is properly adjusted.

• Check for damage to the hood and hinge assembly. 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.