IH made that hoe series to fit wheel tractors, crawlers and even on the back of road driven trucks. Thus all the variations. The ones ending in even numbers are the early models - i.e. 3121 was the newer version of the 3120. There are many subtle differences in them - even with same model number over time.
I've got what's supposed to be a master IH backhoe book from that era. Shows a 3082A, 3120, 3121, 3130, 3131, 3140, and 3141.
3082A has an exposed rack and pinion gear swing and is quite different from the rest.
3120 was built 1962-1965 and used on: 2424, 3414, 3514, 3616, T-340 crawler, 460, 2504, 2606
3121 built 1966 on, used on: 2505, 2606, 2424, 2444, 3414, 3444, 500C crawler
3130 was built 1963-1965 and used on: 340, 469,2504, 2606, 3414, and TD-340 crawler
3131 built 1966 and on, used on: 2504, 2506, 2424, 2444, 3414, 3444 and 500C crawler
3140 built 1963-1965, used on: 340, 460, 2504, 2606, 3414, 3616 and T340 crawler.
3141 built 1966 and on, used on: 2504, 2606, 3414, 3444, and 500C, T7, TD7, TD8, 100C, and 125C crawlers.
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