TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 103 of 481
TM 9-2320-272-10
2-4
Change 2
Key
Item and Function
1
TURN SIGNAL CONTROL LEVER is moved down to operate vehicle left
turn signals and up to operate right turn signals. Lever must be returned to
the center position to turn off signal. Turn signal control is equipped with
hazard tab button.
2
HORN BUTTON is pressed to operate vehicle horn.
2.1
TRAILER BRAKE/JOHNNIE BAR (M931 and M932 series vehicles) is used
ONLY to prevent vehicle movement while stopped on an incline or when
coupling or uncoupling the tractor to or from trailer.
3
SPRING BRAKE OVERRIDE held in during self-recovery of M936/A1/A2
model vehicles with rear winch.
4
FUEL LEVEL GAUGE SWITCH (M929/A1/A2, M930/A1/A2, M931/A1/A2,
M932/A1/A2, and M936/A1/A2 models) permits reading fuel level on the fuel
gauge for each fuel tank when turned L (left) or R (right).
5
FRONT WHEEL DRIVE LOCK-IN SWITCH allows operator to engage front
wheel drive and is used only when vehicle transfer case is in high range. In
low range, the vehicle’s front wheel drive engages automatically. Vehicle
may be in motion or stopped to engage front wheel drive lock-in switch.
6
LIGHT SWITCH controls operation of vehicle lights.
7
ETHER START SWITCH injects ether into engine for cold weather starting.
8
INSTRUMENT PANEL LIGHTS illuminate instrument panel gauges.
9
TRANSMISSION POWER TAKEOFF CONTROL LEVER (M925/A1/A2,
M928/A1/A2, M929/A1/A2, M930/A1/A2, M932/A1/A2, and M936/A1/A2
models) engages transmission power takeoff to provide power for auxiliary
equipment.
10
FRONT WINCH CONTROL LEVER (M925/A1/A2, M928/A1/A2,
M930/A1/A2, M932/A1/A2, and M936/A1/A2 models) is pulled back to wind
front winch, and forward to unwind for lowering loads during A-frame
operation.
11
AUTOMATIC TRANSMISSION SELECTOR LEVER is used to select
vehicle driving gear.
2-3. CHASSIS CONTROLS AND INDICATORS (Contd)
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