TM-9-2350-311-10
HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5
TECHNICAL MANUAL; OPERATOR’S MANUAL
NOVEMBER 1994
TM-9-2350-311-10 - Page 86 of 775
TM 9-2350-311-10
Section I.
DESCRIPTION AND USE OF OPERATOR’S CONTROLS AND INDICATORS
2-1 OPERATOR’S CONTROLS, INDICATORS, AND INSTRUMENTS
This section locates and describes the controls, indicators, and instruments used to operate the howitzer.
NOTE
In this manual, location descriptions of left and right side ALWAYS refer to the left and right side
of the driver while in the driving position.
2-1 .1
Driver’s Controls and Indicators
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2-2
M42 DRIVER’S PERISCOPE
HATCH LOCKING LEVER
FUEL SHUT OFF CONTROL
ASSEMBLY HANDLE
MASTER WARNING LIGHT
FIRE EXTINGUISHER HANDLE
TRANSMISSION SHIFT CONTROL
LEVER
MANUAL CONTROL HANDLE
HAND THROTTLE CONTROL LEVER
ACCELERATOR PEDAL
DRIVER’S HEATER OUTLET DUCT
DRIVER’S SEAT VERTICAL
ADJUSTING LEVER
BRAKE PEDAL
STEERING WHEEL
DRIVER’S FIXED INSTRUMENT
PANEL
Three periscopes allow driver to see outside vehicle while driv-
er’s hatch
IS
closed.
Used to lock/unlock driver’s hatch.
Used to stop fuel flow to engine.
Illuminates when MASTER switch is in ON position and engine
is not running.
Activates fixed fire extinguishers.
Used to select the speed range and the direction of the power
output of the transmission.
Used to engage parking brake.
Another method of controlling the speed (rpm) of the engine.
Pushing forward increases engine speed, while pulling back
decreases engine speed.
When depressed, speeds the engine allowing it to operate at
greater rpm. When the accelerator pedal is released, engine
rpm will return to idle speed.
Provides means of controlling flow of heated air into driver’s
compartment.
Used to vertically adjust driver’s seat.
Used to apply brakes to stow or stop vehicle.
Used to steer vehicle.
Panel having various switches and gages used by driver while
operating vehicle.
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