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 240 of 775
TM 9-2350-311-10
2-11 OPERATION OF FIRE CONTROL EQUIPMENT UNDER NORMAL CONDITIONS
— CONTINUED
2-11.2 M118A2/M118A3 Elbow Telescope and M146 Telescope Mount
a. Installation of M118A2/M118A3 Elbow Telescope
When installing M118A2/M118A3 elbow telescope, make sure electrical connector is not lying
on top of mount.
NOTE
Before installing M118A2/M118A3 elbow telescope, clean forward lens and eyepiece lens using
lens paper (item 33, Appx D).
1 Slide M118A2/M118A3 elbow telescope (1) into M146 telescope mount (2). Support M118A2/M118A3
elbow telescope.
M118A2/M118A3 elbow telescope weighs 55 pounds (24.9 kg). Failure to install kingpin will
result in injury to personnel and damage to M118A2/M118A3 elbow telescope when cannon tube
is elevated.
2 Install kingpin (3) and tighten by rotating clockwise,
3 Connect cable assembly receptacle (4) on M146 telescope mount (2) to underside of M118A2/M118A3
elbow telescope (1).
b. Description of M118A2/M118A3 Elbow Telescope and Ml 46 Telescope Mount Components
1
2
3
4
5
6
7
Lock-release lever (5) locks the M118A2/M118A3 elbow telescope (1) in any position at any desired
angle.
Variable resistor knob (6) varies amount of light for reticle pattern when turned.
Level vial (7) is used by the gunner to cross-level the cant corrector whenever it is in canted position.
Level assembly mirror (8) is provided for easy viewing of the level vial (7).
Wormshaft assembly knobs (9 and 10) are used in conjunction with the level assembly to correct cant.
Elevation knob (11) adjusts the M118A2/M118A3 elbow telescope (1) up or down 8 mils when turned.
Elevation dial (12) registers elevation corrections in mils.
2-142
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