International TD-7C Full Power Shift 1970
|Preceded by||McCormick-Deering TD-35|
|Superseded by||International TD-9 Series 91|
|Power hp||60 gross, 56 net|
|Displacement cu in /(litre)||206 ci|
|No. of Cylinders||4|
|Bore in (mm)||3.875"|
|Stroke in (mm)||4.375"|
|Naturally aspirated, Turbo or Supercharged||NA|
|Transmission type||power shift with torque converter|
|Tyre Sizes (std/options)|
|Weight (nominal) lb/kg||12510 lb (with dozer)|
The International TD-9 crawler replaced the unstyled McCormick-Deering TD-35. The TD-9 used a diesel version of the 335 ci 4-cylinder of the T-9 instead of the 414 ci diesel of the TD-35. When it introduced the TD-9, International was trying to compete with the Caterpillar D-4 and so it designed a very similar tractor. Both tractors were the same size and powered by 4-cylinder diesel engines running at 1,400 rpm with 5-speed transmissions. Caterpillar used its pony motor starting system while the International started on gasoline and then switched to diesel. The basic International was crank started with an electric starter optional. The TD-9 and the other early International crawlers had engine side screens with horizontal silver stripes, matching three silver grille bars dividing sections of red cross bars.
In 1940 the TD-9 had a slightly larger engine than the D4, 335 ci vs. 312 ci, and developed slightly more power, 44 vs. 40 belt hp. The only other tractor in this class was the Cletrac BD-6, which developed 46 belt hp from a 298 ci 6-cylinder Hercules diesel running at 1,400 rpm. The Cletrac had only a 3-speed transmission.
In 1947 Allis-Chalmers brought out its new HD-5, the most powerful tractor to date in this class with 48 belt hp. Caterpillar increased the engine size of the D-4 to 350 ci, boosting it to 48 belt hp. International responded in 1951 with a small upgrade to the TD-9 that developed 47 belt hp. About the same time the tractor lost its engine side screens and silver bars in the grille.
In 1955 Caterpillar went to 59 hp, Oliver to 57 hp, and Allis-Chalmers to 61 hp. Clearly the TD-9 was falling behind its competition so, in 1956, International brought out the revised International TD-9 Series 91 .
- 1940 - International TD-9 replaced the McCormick-Deering TD-35
- 1951 - TD-9 power increased
- 1956 - TD-9 Series 91 replaced the original TD-9
Factory locations Edit
See Infobox for basic details
- Track frame: 5 rollers, 1 idler
- Track gauge: 52"
- Track shoe width: 12"
Variations and Options Edit
- Optional track show width: 15"
- Rubber track shoes: 10"
- Hydraulic system
- Logging winch
- Logging arch
Serial Numbers Information Edit
|Year|| Serial no. run|
| Serial no. run|
|1940||TCB501||2173||1673||Serial range includes T-9 and TD-9|
|1941||2174||4173||2000||Number built calculated|
|Total built||48880||Total serial range minus T-9 production|
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