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 28 of 1015
TM 9-2320-272-24-1
1-14. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS (Contd)
b.
Interior Cab Components. The components described herein are common to one or more vehicles
covered in this manual. Components not found here can be found in TM 9-2320-272-10 or in table 1-2,
Differences Between Models (para. 1-15), of this manual.
Key Item and Function
1
FRONT-WHEEL DRIVE LOCK-IN SWITCH
- A pneumatic switch that permits front-wheel drive
to be engaged when the transfer case is in HIGH position. Operation of switch is not required when
transfer case is in LOW position; system will automatically switch into six-wheel drive.
1-18
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