You didn't say what tractor or engine your working on.
Diesel engines and some gas engines have larger filet radius on the journals than your average gas car crank, the machine shops have to dress the machines grinding wheel to allow for the larger radius.
Although the machine shops should know want their doing mistakes can happen as did in my case.
I sent the crank for my Ford 4000 diesel to be ground, although they are a reputable shop someone made a mistake and ground the crank wrong cutting the large radius down to a standard car crank radius.
I missed this when assembling the engine and a short time later the crank broke in half at the radius of #1 rod journal.
Ask the machine shop if they are familiar with grinding large radius cranks such as on diesel engines.
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