yes very useful to the big farmers on the prairies. lots were hooked in tandem and used to pull large equipment. once they increased the bore to 4.5" in the super and reworked the pump these tractors were very powerful. there was also an overbore kit for 4 5/8". this is also a very sought after kit.they pulled a 5-16's plow. could pretty much pull what the 660 did. i have a wd9 and the super wd9 and the diff. is like night and day between them. the wd9 is around 50 hp, while the super is close to 70hp. also the pinion brgs did not stand up in the diff. i believe these tractor just got worked to death also, which did not help their reputation.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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