37-mm AA gun materiel

a. This manual is published for the information and guidance of the using arms and services. h. In addition to a description of the 37-mm antiaircraft materiel, this manual contains technical information required for the identification, use, and care of the materiel It differs from TM 9-235: 37-mm AA Gun Materiel, dated 16 May 1942, as follows: (1) Addition of information on the Combination Gun Mount M42, with Sighting System M6. (2) Addition of information on the Direct-fire Sighting System M 5. with Telescopes M7 and M64, (3 ) Antiaircraft Director M5 and Generating Unit MS are omitted. They are published in TM 9-6 S 9 and TM 9-616, respectively. For other off-carriage equipment not contained in this manual, see section XVII. c. Disassembly assembly, and such repairs as may be handled by using arm personnel will be undertaken only under the supervision of an officer or the chief mechanic. d. In all cases where the nature of the repair, modification, or adjustment is beyond the scope or facilities of the unit, the responsible ordnance service should be informed in order that trained personnel with suitable tools and equipment may be provided, or proper instructions issued. a. The 3 7-mm Antia ircra ft A utom atic Gun M 1 A2 is a h ighve locity antiaircraft weapon of the long recoil type. The tiiin can also be fired manually by changing the setting of a foot firing mechanism which is incorporated in the gun carriage. The carriage is a 4-wheeled trailer carriage capable of being towed 50 miles per hour over good roads. The carriage is lowered to the ground for firing and raised to the wheels for traveling by means of four counterpoise cylinders. Antitank firing as well as antiaircraft firing is possible, as a maximum depression of minus 5 degrees and a maximum elevation of plus 90 degrees can be real i zed when ele vati ng m ec ha n ism is m a n u a lly operated. A rem ote control or "off-carriage" system of pointing the gun in firing azimuth and quadrant elevation is possible on the Carriage M3A1 through data furnished by a Director MS located approximately 13 feet from the gun. Power is furnished by a motor-driven generator, also designated as M5, b. There are three model designations for the carriages mounting the Gun M1A2, the earliest being the M3, on which the elevating, traversing, and leveling mechanisms are operated by handwheels, while the cradle is of open frame construction. Another distinguishing characteristic is the two Telescopic Sights M7 mounted on the gun. The second model, the M3E1, is similar in appearance to the M3 but includes two Browning Machine Guns, cal,,50, M2, water cooled. For description and functioning of these guns, see TM 9 226. Since there are comparatively few of these early units in the field, this text wilt chiefly concern the third and latest model, the M3A1, using double hand cranks for elevating and traversing instead of hand wheels. The two oil gear units and other fire control equipment mounted on the top carriage positively identifies the Carriage M3A1, A detailed comparison of these models will be found in paragraph 3 on carriage data, c. The Combination Gun Mount M42 permits the 37-mm gun and the two Browning Machine Guns, caL.50, M2, heavy barrel, with which it is equipped to be traversed 360 degrees. The guns may be elevated to 85 degrees and lowered to a horizontal position.

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