Lit. No. 49513, Rev. 04
79
June 15, 2022
MAINTENANCE
AIMING HEADLAMP BEAMS
Tighten headlamp fasteners to 45 ft‑lb once
correct visual aim is achieved.
1. Park the vehicle on a level surface 25 feet
(7.62 m) in front of a matte‑white screen,
such as a garage door. The screen should be
perpendicular both to the ground and to the
vehicle centerline.
2. The vehicle should be equipped for normal
operation. The snowplow blade should be
in place and in raised position. Below are
the steps listed by the Society of Automotive
Engineers (SAE) pertinent to headlamp aiming
in specification #SAE J599d.
3. Prepare the vehicle for headlamp aim or
inspection. Before checking beam aim, the
inspector will:
a. Remove ice or mud from under fenders.
b.
Set tire inflation pressures to the values
specified on vehicle information label.
c. Check springs for sag or broken leaves.
d. See that there is no load in the vehicle
other than the driver and ballast as
specified in the Quick Match selection
system.
e. Check the functioning of any automatic
vehicle leveling systems and specific
manufacturer's instructions pertaining to
vehicle preparation for headlamp aiming.
f. Clean the lenses.
g. Check for bulb burnout and proper beam
switching.
h. Stabilize the suspension by rocking the
vehicle sideways.
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