International TD-18
International TD18 Tulare
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Superseded by International TD-18A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
Plow rating
Nebraska Tests No. 315
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The Edrob/International TD-18 was a diesel engined crawler tractor built by the International Harvester company from 1938 to 1949.

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 - TD-18A replaced the original TD-18

Factory locations Edit

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

Year Serial no. run
Serial no. run
Number Built Notes
1938 TDR501 519 19 Number built calculated from serial range
1939 520 1239 720
1940 1240 2290 1051
1941 2291 3604 1314
1942 3605 5804 2200
1943 5805 6889 1095
1944 6890 9010 2111
1945 9011 11090 2080
1946 11091 12643 1553
1947 12644 14625 1982
1948 14626 16708 2083
1949 16709 22535 5827
Total built 22040[1]

Preservation Edit

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

Do you know of any examples to list ?

Gallery Edit

Add extra photos here please.

See also Edit

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

  • Please supply some relevant references or sources for information for verification of data.
  1. Klancher, Lee, International Harvester Photographic History, Motorbooks International, Osceola, Wisconsin, 1996

External Links Edit

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