Headlamp Beam Aiming - Western HTS Mechanic's Manual

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.
Lit. No. 41467, Rev. 01
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.
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.)
Vertical
Align with
Centerline
vehicle
ahead of DS
centerline
Snowplow
Headlamp
Screen
Located
High Intensity Zones
25 feet from
of Snowplow Headlamps
Snowplow
on Low Beam
Headlamps
Vertical
Centerline
ahead of PS
Snowplow
Headlamp
Horizontal
Centerline
of Snowplow
Headlamps
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April 15, 2021