An acquaintance of mine is interested in the above D6C Ser # 76A 5909 (if that is the correct number) for sale in our local area & I wondered what the build date & rated HP would have been on that machine? It is power shift they tell me with the angle blade on it.
Might want to recheck that S/N. See where it was on machine. It's been many years since I saw one but I'm thinking a 76A**** serial number is for a 966 or 966B frontend loader. I suppose if this number came off a tag on the engine it is possible someone used the engine or parts of one from a 966 to repower the Dozer. I take that back 76A is indeed a D6C the 966B's I was thinking of were 75A**** Here's a link to a Ritchie Auction site with some information: http://www.ritchiewiki.com/wiki/index.php/Caterpillar_D6C_Crawler_Tractor
According to my "Touquip" info book, it would be a 1968 and a very late one at that, as they only went to 6061. The book shows it being 120 horsepower. FWD
Second that. Build year 1968, one of the last built. 120HP. The ACMOC web site will likely have people who can give far more information than that.