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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Old Caterpillar

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Jim Bannon

12-13-2005 07:25:00




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I just bought an old Caterpillar R2. Serial #6J302SP. I was wondering if someone could tell me the year of it and anything else anyone knows about the R2s. Any help is appreciated




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ksb1

12-13-2005 15:44:11




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 Re: Old Caterpillar in reply to Jim Bannon, 12-13-2005 07:25:00  
your tractor S/N 6J302SP would be a 1939. There is what Caterpillar says about the letters SP., "“SP” stamped at the end of the Serial Number indicates special parts were substituted for standard parts on the machine. Examples include special transmission gears, oversized idlers in place of standard idlers, and other items that required special attention on the assembly line, usually “deep” in the machine. “SP” was not used for add-on accessories such as lights, cab, PTOs, crankcase guards, and mufflers. Caterpillar Service magazine, February 20, 1941, defines “SP”."

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Billy NY

12-13-2005 10:38:28




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 Re: Old Caterpillar in reply to Jim Bannon, 12-13-2005 07:25:00  
I took a look in the handbook, it would appear to be an early model, production started in July 1938, ended April 1942. Yours is the 302nd built, out of a total 1150 built. Not sure what the production was for each year. 6J is a wide gauge tractor at 50" from center of sprocket to center of sprocket, and the SP, denotes special equipment, could be as obscure as special gear ratios in the transmission or more pronounced with some other additional option, not sure what those may be. Very similar to the J model D-2 tractors, except for the gas powered engine. I'd imagine there are not a lot of the R series gas models around. In contrast, R-3's are quite rare at 60 produced and thought there was a R2-5E series with a low production, but I am really not familiar with them, just quoting a reference book.

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