International TD-18, unrestored. at tractor show
|Preceded by||New model|
|Superseded by||International TD-18A|
|Power hp||81 belt, 72 drawbar|
|Displacement cu in /(litre)||691 ci|
|No. of Cylinders||6|
|Bore in (mm)||4.75"|
|Stroke in (mm)||6.5"|
|Naturally aspirated, Turbo or Supercharged||NA|
|Transmission type||dual-range sliding gear|
|Clutch||Rockford single plate|
|Tyre Sizes (std/options)|
|Weight (nominal) lb/kg||22000 lb|
|Turning circle (nominal) inches/meters||18 ft|
|Factories||Melrose Park, Illinois, USA|
|Nebraska Tests No.||315|
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.
- 1938 - International TD-18 introduced
- 1949 - International TD-18A replaced the original TD-18
Factory locations Edit
- Melrose Park, Illinois, USA
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
- Electric lights
Serial Numbers Information Edit
|Year|| Serial no. run|
| Serial no. run|
|1938||TDR501||519||19||Number built calculated from serial range|
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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
- ↑ Klancher, Lee, International Harvester Photographic History, Motorbooks International, Osceola, Wisconsin, 1996
External Links Edit