For example the D9N replaced the D8L, the D10N replaced the D9L and the D11N replaced the D10. With the introduction of the N-Series tractors in 1986-87 their model numbers were pushed up.
The D10 had more sales than the Fiat-Allis/Komatsu competitors similar sized bulldozers combined. Between 19 nearly 1,000 D10s were made at Caterpillar's East Peoria, Illinois, USA plant. The D10 was introduced at a dealer meeting by Caterpillar in the fall of 1977. The D10 was so big that it was about 50 percent more production than the D9H. In 1976 Japanese company Komatsu came out with an even larger bulldozer called the Komatsu D455A at 620 hp (460 kW) and 167000 lb. For example, the Fiat-Allis 41-B track-type tractor had 524 hp (391 kW) at the time, while the D9H had 410 hp (310 kW). In 1974 after AC and Fiat merged their construction equipment divisions the 524 hp (391 kW) 41-B was introduced. Allis-Chalmers introduced at Conexpo 69 in Chicago a 524 hp (391 kW) Allis-Chalmers HD-41, which was the largest crawler in the world (at that time). At this time, competitors were building bulldozers that were more powerful than the D9. The Caterpillar D10 was the result of a need for a tractor larger than the Caterpillar D9. In March 1977 prototypes P-1 thru P-10 would be appear and dispatched to different job sites.
The first pilot D10 was D10X1 and was shown in July 1973 at a big Caterpillar corporate meeting. 1.2 Advantages and disadvantages of the High Drive system.
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