International TD-18, unrestored. at tractor show
Model history
Model introduced	1938
Model discontinued	1949
Model status	Discontinued
No. produced	22,040
Preceded by	New model
Superseded by	International TD-18A
Engine Specification
Engine make	International
Engine model	D-691
Fuel type	diesel
Power hp	81 belt, 72 drawbar
Governed rpm	1200
Displacement cu in /(litre)	691 ci
No. of Cylinders	6
Bore in (mm)	4.75"
Stroke in (mm)	6.5"
Cooling system	water
Naturally aspirated, Turbo or Supercharged	NA
Transmission Details
Transmission type	dual-range sliding gear
Clutch	Rockford single plate
Gearbox make	International
Forward	6
Reverse	2
Drive	crawler
General Data
Linkage Category	drawbar
Tyre Sizes (std/options)
Front	18" tracks
Tractor Dimensions
Length (inches/metres)	158"
Width (inches/meters)	94"
Height (inches/meters)	90"
Weight (nominal) lb/kg	22000 lb
Turning circle (nominal) inches/meters	18 ft
Wheelbase	74" gauge
Other info
Factories	Melrose Park, Illinois, USA
Plow rating
Nebraska Tests No.	315
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The International TD-18 was a diesel engined crawler tractor built by the International Harvester company from 1938 to 1949 in Melrose Park, Illinois, USA.

Model historyEdit

For Company history, see International Harvester.

The International TD-18 was the first tractor with International’s striking new styling theme, with smoothly rounded corners and a grille with a single vertical center bar and numerous fine horizontal bars sweeping around to line up with similar bars in the hood side panels. The TD-18 was also the first International to use a new numbering system and it was the biggest crawler the company had made, weighing almost 11 tons. The new 691 ci 6-cylinder diesel had the same bore and stroke as the 4-cylinder in the McCormick-Deering TD-40 and it retained the gasoline starting feature. The TD-18 developed 80 belt and 72 drawbar hp. The transmission was a 6-speed dual range unit.

The other major crawler manufacturers in 1939 were Allis-Chalmers, Caterpillar, and Cletrac. Allis-Chalmers didn’t make a full diesel in 1939 but its S-O semi-diesel was in the same class as the International TD-18. The S-O was un unstyled model first built in 1937. Its big 4-cylinder engine ran at lower rpm than the International and the power output was a little lower. The Caterpillar D-7 Series 9G, introduced in 1936 as the RD-7, developed considerably less power than the TD-18 at its normal 850 rpm operating speed. The Cletrac DD was a much smaller tractor, about the size of the International TD-40. In 1940 Allis-Chalmers brought out the HD-10. It was a styled model about the same size as the TD-18 but its General Motors 2-cycle full-diesel engine produced considerably more power, 98 belt hp at a high 1,600 rpm. The A-C also had a 6-speed transmission like the International. In 1941 Caterpillar introduced the revised D-7 Series 7M. It weighed about 3,000 lb more than the TD-18 and had more power (89 belt hp) at its new 1,000 rpm governed speed. In mid-1944 Caterpillar produced the even more powerful D-7 Series 3T. International was falling behind its competitors in this class and the TD-18 was replaced by the heavier and more powerful TD-18A in 1949.

Timeline Edit

• 1938 - International TD-18 introduced
• 1949 - International TD-18A replaced the original TD-18

Factory locations Edit

• Melrose Park, Illinois, USA

Specification Edit

See Infobox for basic details

• Track gauge: 62" or 74"
• Track shoe width: 18" (1940); 20" (1948)
• Electric starting

Variations and Options Edit

• Wide-gauge version
• Optional track shoe width: 14", 16", 19", 20", 22", or 24"
• Belt pulley
• Pto
• Electric lights

Serial Numbers Information Edit

Preservation Edit

No information on any individual examples of these tractors in preservation is currently available on here.

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Gallery Edit

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International TD-18 1940

International TD-18 engine 1940

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See also Edit

• List of Tractor Manufacturers
• List of International Harvester Vehicles

Collection related info

• Shows and Meets - events featuring tractors and other machinery
• Clubs Listing - List of clubs including various tractor marques
• Collections - list of private collections with tractors (add yours)
• Museums - includes museums featuring tractors (please add missing ones)

References / Sources Edit

External Links Edit