XIV

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Tractor, "Heavy," M1
Caterpillar Tractor, Crawler, Diesel, Model D7 from TB 5-9720-11, 1944
Type	Heavy tractor
Manufacturer	Caterpillar Tractor Co.
Length	194 in (4.93 m)
Width	98 in (2.49 m)
Height	108 in (2.74 m)
Weight	30,100 lb (13,653 kg)
Propulsion	Caterpillar tracks
Engine model	Caterpillar D7
Gross power	80 hp (60 kW)
Drawbar pull	21,350 lb (9,680 kg)
Speed	11 mph (18 km/h) Forward

M1 heavy tractor was a term used by the United States Army during World War II for several different models of "off the shelf" civilian tracked tractors adopted for military use. Under the Ordnance Department, these tractors were meant to tow artillery pieces, and were not equipped with blades like their Corps of Engineers counterparts. Later in the war, these tractors were replaced in the prime mover role by heavy trucks such as the Mack NO or purpose-built "High Speed Tractors" such as the M4, M5, or M6. Some tractors were equipped with crane attachments for ammunition and "material handling."

More than 1,000 were leased to the Soviet Union. They mostly used them to tow 122 mm, 152 mm and even 203 mm guns. It saw good service as a prime mover for artillery.

Variants※

• Allis-Chalmers Model L
• G-022 Caterpillar Model 60
• G-89 Caterpillar RD7,
• G-98, G-107 Allis-Chalmers HD-10DW
• G-101 International Harvester TD-18
• G-126 Caterpillar D7
• G-153 Caterpillar D8

and perhaps others.

Gallery※

• 
  Allis-Chalmers Tractor, Crawler, Diesel, Model HD-10W from TM 9-787A
• 
  International Heavy Tractor, Crawler, Diesel, Model TD-18 from TM 9-1777A
• 
  International Heavy Tractor, Crawler, Diesel, Model TD-18.second image from TM 9-1777A
• 
  Caterpillar Tractor, Crawler, Diesel, Model D7 from TB 5-9720-11, 1944
• 
  Caterpillar Tractor, Crawler, Diesel, Model D8 from TB 5-9720-11, 1944

See also※

• List of U.S. military vehicles by model number
• List of U.S. military vehicles by supply catalog designation
• M1 medium tractor
• M1 light tractor
• M2 Light Tractor
• Allis-Chalmers (See Military Machinery)

References※

• TM 9-1777A Heavy Tractor M1 International IHC TD-18
• TM 9-1777C
• TM 9-1773 Heavy Tractor M1, Caterpillar D7
• TM 9-787A Heavy Tractor M1, Allis-Chalmers HD-10W
• TM 9-1787A
• TM 9-1787B
• "TM-9-2800 1943 Standard Military Motor Vehicles".

External links※

• Drawings jexiste.be
• Use of M1 heavy tractor Caterpillar D7 through Lend Lease in the Soviet Union
• Use of A-C HD-10W through Lend Lease in the Soviet Union
• Use of IHC TD-18 through Lend Lease in the Soviet Union