12E 9K9063 motor grader questions

New member here.

I'm looking to possibly buy a grader with s/n 9K9063 and labeled 12E. I understand that the 9K series was built from 1938 to 1945, but the 12E dates from 1959 to 1965. Anyone know how to explain the discrepancy? It has an inline 6 with pony motor. 

How hard is it to overhaul the foundation brakes?

The tires are dry rotted pretty bad but hold air. Would tire chains keep them from falling apart?

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Thanks!

it isn't a 12E someone just put the wrong decal on it sometime ago when it was painted. the brakes aren't difficult to work on but getting the wheel center off can be a chore.

Tire chains will only exacerbate the dry rot problem. Looks like the rear tandem tire is a severe misfit or the photo is distorted. Se# is 1945 and probably has the D4600 engine.

Here's a closer photo of the LR tires. I think they're the regular size, 13.00-24. Also a shot of the RR, quite rotted.

Is a pdf shop manual available?

Thanks for the info!

A 9K Service Manual and a 9K parts manual are available in the technical section. Didn't see an operators manual.