Generating Units M5 And M6 - TM 9-1616 War Department Technical Manual

Differences in manufacture. Description and construction Differences between Unit M5 and Unit M6 4 a. This manual is published for the information and guidance of ordnance maintenance personnel. It contains detailed instructions for inspection, disassembly, assembly, maintenance, and repair of the Generating Unit M5 (including differences between M5 and M6), supplementary to those in the Field Manuals and Technical Manuals prepared for the using arms. Additional descriptive matter and illustrations are included to aid in providing a complete working knowledge of the materiel. a. These generating units have been assembled by different manufacturers who have used standard parts made by still other manufacturers. Working drawings have been furnished by the Ordnance Department. Similar parts will be found reasonably interchangeable regardless of where they are made. A metal plate is mounted on the instrument panel door of each unit, carrying the name of the manufacturer or prime contractor responsible for the construction of that particular unit. If required to make a record of this, be sure to copy the name exactly as it appears, because firm names are sometimes similar. For example, Units M5 have been made by the Hobart Manufacturing Company and by the Hobart Brothers Company, two entirely unrelated companies, both in Troy, Ohio. a. General. This unit is a self-contained power plant consisting of three main units: gasoline engine, power generator, and switchboard. These units are mounted on a welded steel frame, which also serves as a skid when the unit is moved. The unit is completely enclosed by a sheet metal housing. The radiator end of the unit is considered the front, and the main generator end, the rear. Right and left sides are determined from the rear, facing forward. Hinged hoods on the sides and a vertically hinged door on the rear of the housing give access to the engine, generator, and instrument panel. A sheet metal battery cover on the lower front part of the housing is easily removed for the purpose of servicing the battery (fig. 1). The canvas instruction book holder is on the inside of the instrument panel door Original frcrn ■»
• "?/» — — (fig. 2). Four porter bar brackets are attached to the sides and ends of the unit. By inserting porter bars in the brackets six or eight men can carry the unit to any desired location (fig. 1). The gasoline tank is mounted on the inside of the housing, and the gasoline tank filler cap oh the outer, right-hand side. The gasoline tank gage is on the left-hand side of the gasoline tank (fig. 1). A tool box, mounted on the generator, serves as a container for maintenance tools and spare parts (fig, 2), Spare cylinder head gaskets are carried under a steel plate bolted to the engine hood directly over the muffler (fig. 3). b. Engine. The 4-cylinder, 4-cycle, 1 1-horsepower (N.A.C.C.) gasoline engine is directly connected to the main generator by a resilient coupling. It is equipped with an electric starting motor, battery charging generator (fig. 2), oil bath air cleaner, oil filter, and gasoline strainer. Engine speeds are controlled by a mechanical governor (fig. 3). c. Main Generator. The main generator is an alternating-current generator of the revolving field type with separate excitation provided from a direct-current generator mounted in the same housing and on the same shaft. At 1,200 revolutions per minute, it delivers 3 KVA-13.9 amperes at 125 volts 3-phase. Adjustments on the change-over panel governor provide either 50-cycle or 60-cycle current (fig. 2).

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