1939 caterpillar D3 information required

Ryankrook

New User
Hello guys and gals, so I recently aquired a 1939 D3 and the pup motor needed new crank bearings. I am looking for a service manual or a website to download one from. Also looking for someone who has parts and information.
Model number is posted in the picture.

Thanks everyone for your help!

Ryan
Alberta, Canada
 
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Caterpillar D4 Tractor Parts Manual Book Catalog 1939 7J1 on up is available on E-bay for $39.99 along with several other D4 books from that era. Also the ACMOC group ( Antique Caterpillar Machinery Owners Club ) is a good source for information. As far as parts believe it or not some parts are still available from Caterpillar .
 
Ok, must have read something wrong. The ACMOC s/n reference book says 7J1-1757 as 1939 production. My Cat Performance Handbook says 7J1-1754 as 1939 production.
 
(quoted from post at 11:09:58 12/29/17) Caterpillar D4 Tractor Parts Manual Book Catalog 1939 7J1 on up is available on E-bay for $39.99 along with several other D4 books from that era. Also the ACMOC group ( Antique Caterpillar Machinery Owners Club ) is a good source for information. As far as parts believe it or not some parts are still available from Caterpillar .

The parts manual is just a part number listing correct? Quite different from a service manual.
 

I have found some service manuals for a 7G and a 7U. What's the difference between that model and the 7J that I have?
 

That 7G is a typo, should read 7J and is the same 4-1/4" bore engine in the 4G, 7J, 2T and 5T.
The 6U/7U is a different 4-1/2" bore engine
 

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