Lit. No. 41298, Rev. 01 February 15, 2019
13
SYSTEM OVERVIEW
HEADLAMP BEAM AIMING
Torque headlamp fasteners to 45 ft-lb once correct
visual aim is achieved.
1. Place vehicle on a level surface 25 feet 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 steps
listed by the Society of Automotive Engineers
(SAE) pertinent to headlamp aiming in
specifi cation #SAE J599d.
3. Prepare vehicle for headlamp aim or
inspection. Before checking beam aim, the
inspector will:
a. Remove ice or mud from under fenders.
b. Set tire infl ation pressures to the values
specifi ed 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 specifi ed in
the eMatch selection system.
e. Check functioning of any automatic
vehicle leveling systems and specifi c
manufacturer's instructions pertaining to
vehicle preparation for headlamp aiming.
f. Clean lenses.
g. Check for bulb burnout and proper beam
switching.
h. Stabilize suspension by rocking vehicle
sideways.
Vertical centerline ahead of
DS snowplow headlamp
Align with vehicle
centerline
Vertical centerline ahead of
PS snowplow headlamp
Screen located 25 feet
from snowplow headlamps
Horizontal centerline
of snowplow headlamps
High-intensity zones of snowplow
headlamps on low beam
4. Mark (or tape) the vertical centerline of
the snowplow headlamps and the vertical
centerline of the vehicle on the screen. Mark
the horizontal centerline of the snowplow
headlamps on the screen (distance from
ground to snowplow headlamp centers).
5. Align the top edge of the high intensity zone
of the snowplow lower beam below the
horizontal centerline and the left edge of the
high intensity zone on the vertical centerline for
each snowplow headlamp. (Refer to diagram.)
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