Mb-4 Aircraft Towing Tractor Parts

(Page 3) End item NSN parts page 3 of 9
Part Number
NSN
NIIN
032397T Piston Ring
010793290
03300256 Incandescent Lamp
008891799
0332-0500 Pressure Switch
005034884
035080 Pipe Reducer
007205002
0370645 Inclosed Link Fuse
011235211
0370645 Inclosed Link Fuse
011235212
0432217104REV Fuel Injection Nozzle
011500950
0451203228 Fluid Filter Element
012808419
05-803316 Universal Joint Parts Kit
007024578
054989 Pipe To Tube Elbow
002890155
055701-230 Vehicular Clutch Disk
001721947
058164-0502 Tube To Boss Straight Adapter
001257922
0625NC-3500-2 Hexagon Head Cap Screw
007247247
0658269-00 Needle Roller Bearing
009623263
0669313 Inclosed Link Fuse
011235211
07-855846 Universal Joint Parts Kit
007024578
070106 Annular Ball Bearing
001089247
070684734 Intake Air Cleane Filter Element
004592839
0725448 Check Valve
011659596
076-006392-002 Electrical Connector Backshell
010144920
Page: 3

Tractor, Aircraft Towing, Mb-4

Picture of Mb-4  Aircraft Towing Tractor

The Allis-Chalmers M7 snow tractor was designed for use by the U.S. Army Air Corps as a rescue vehicle in remote northern bases.

The M7 (T26E4) snow tractor was standardized in August 1943, and was downgraded to Limited standard in November 1944. It was intended to pull a one-ton M19 snow trailer (T48). The tractor used many Allis Chalmers farm tractor components. It also used many MB jeep powertrain components to lessen the military's spare parts inventory requirements.

The distinguishing feature of the M7 was the track system (halftrack). The M7’s track ran on two rubber belts with four steel cables inside. The machine had a tendency to have the tracks come off in use. Another feature of both the tractor and trailer is that the tires could be switched with skis.

Prototyping of the machine that eventually became the M7 included several machines by Emmett Tucker ( of subsequent Tucker Sno-Cat fame ) At least one of the prototypes, a T26E3, still exists.

Something over ten percent of production, over 30 units, still survive. The track system and track plate width (18") look to have been borrowed from the early versions of the Weasel, although the M7 tracks are shorter with fewer plates.

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