TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 670 of 1015
TM 9-2320-272-24-1
3-116. HEADLIGHT MAINTENANCE
THIS TASK COVERS:
a. Removal
b. Installation
c. Alignment
APPLICABLE MODELS
REFERENCES (TM)
All
TM 9-2320-272-10
TOOLS
TM 9-2320-272-24P
General mechanic’s tool kit (Appendix E, Item 1)
EQUIPMENT CONDITION
MATERIALS/PARTS
l
Parking brake set (TM 9-2320-272-10).
l
Hood raised and secured (TM 9-2320-272-10).
Three lockwashers (Appendix D, Item 345)
l
Battery ground cables disconnected (para. 3-126).
a. Removal
NOTE
Tag all connectors for installation.
1.
Remove three screws (3) and retaining ring (2) from headlamp housing (1).
2.
Pull headlamp (4) out from headlamp housing (1).
3.
Disconnect three connectors (5) from headlamp housing (1).
4.
Remove three nuts (10), lockwashers (8), and headlamp housing (1) from hood (9). Discard
lockwashers (8).
5.
Disconnect three connectors (11) from headlamp housing (1).
6.
Remove three headlamp connectors (7) and grommets (6) from headlamp housing (1).
1.
Install three grommets (6) and headlamp connectors (7) on headlamp housing (1).
2.
Connect three connectors (11) to headlamp housing (1).
3.
Install headlamp housing (1) on hood (9) with three new lockwashers (8) and nuts (10).
4.
Connect three connectors (5) to headlamp housing (1).
5.
Position headlamp (4) in headlamp housing (1) with the words SEALED BEAM positioned at
bottom of headlamp (4).
6.
Install retaining ring (2) on headlamp housing (1) with three screws (3).
7.
Connect battery ground cables (para. 3-126).
c. Alignment
1.
Draw a horizontal line (12) on a wall the height of center of headlights (15).
2.
Park truck facing wall so headlights (15) are 25 ft (7.6 m) from wall.
3.
Draw a vertical line (14) through horizontal line (12) so it is in line with center of headlight (15).
4.
Turn headlights on low beam (TM 9-2320-260-102
5.
Adjust headlight horizontal direction with adjusting screw (16) until left edge of bright light
area (13) on wall is 2-6 in. (5.08-15.24 cm) right of vertical line (14).
6.
Adjust headlight vertical direction with adjusting screw (17) until top edge of bright light area (13)
on wall is touching lower side of horizontal line (12).
7.
Adjust other headlight using same procedure.
3-306
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