TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 702 of 1275

TM 9-2350-311-20-1

8-21 HEADLIGHTS

This task covers:

a. Alinement

b. Removal

c. Installation

d. Adjustment

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Materials/Parts

General mechanic’s tool kit (item 64, Appx H)

Silicone compound (item 18, Appx D)

a. Alinement

NOTE

Alinement of lights should be performed in shaded or dimly-lit area.

1 Park vehicle on level ground or pavement 25 ft (7.62 m) from a wall.

2

Draw line (1) perpendicular to wall or screen, passing through center of vehicle.

3

Measure distance from center of sealed lamp unit (service side, clear) to ground. Duplicate this measurement

on wall, drawing horizontal centerline (2) of lamp unit.

4 Draw

a

line (3) parallel to and 27.25 in. (69.2 cm) below centerline (2).

5 Draw a line (4) parallel to and 53 in. (1.35 m) left of centerline (1) of vehicle.

6 Draw a line (5) parallel to and 58 in. (1.47 m) right of centerline (1) of vehicle.

7 Turn on lights to low beam. Center of left beam’s highest light intensity should be where lines (3 and 4) cross.

Center of right beam’s highest light intensity should be where lines (3 and 5) cross. Adjust if necessary (see

below).

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