You might try a couple different things.
First, try on Ebay. IH did put out service manuals for the different components of tractors like steering, transmission, and hydraulics, and so on. You might find a used one on there.
Or, look for a manual called an I&T Manual. They printed them for most tractorsand if I'm not mistaken, the manual for the 656 is the same for the 706, 806, and others ....... not sure though.
The I&T manuals took the most used sections from the manufacturers manuals and put it into a smaller version. All of the questions that I've have regarding something with my tractors, I've found the answers in an I&T manual.
9 quarts
30 weight, we use Case IH motor oil 30 weight.
You can view pictures of this tractor online. Simply do a Google Image search on that model. You can find pictures of the IH 656 at many places on the internet. For example there are several on RedPowerMagazine.com.
Try a Case-IH dealership.
ih or farmall 706 is a 70 to 80 horse power tractor depending on the year1963 to 1967
Case IH is a brand of agriculture equipment. The company was created in 1984. Today Case IH is owned by CNH Global. CNH Global is owned by Fiat Industrial.
IH tractor 1066
The IH 460 D fluid is the hydraulic fluid. The tractor can overheat when the fluid gets low.
About 2.8 tonnes.
Try www.tractordata.com
International Harvester (IH) was founded in 1847 as the McCormick Harvesting Machine Company in Chicago. The first IH tractor was released in 1926.
There is a forum that will help you identify why your IH tractor broke down. This forum http://www.ssbtractor.com/wwwboard/Farmall_tractors.html will help you discover the answers to your questions. Plus people from all over the world is using this forum. You will get different perspectives and help regarding your IH tractor. If this doesn't work then I would recommend finding someone who knows how to fix your IH tractor for a low price.