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| As silly as it maybe sounds - No....lol
A hot diesel engine has higher compression pressures than a cold engine and can actually crank harder than a cold engine (not withstanding extreme low temps).
A person doesn't notice it as much because the batteries are normally at full charge and beings the engine fires quickly the batteries surface charge is usually enough to start the engine. But if there is some drag to the starter (and a lot of times a hot starter will drag when it is worn to some extent) a loss of 100rpm cranking speed is easy.
A quick check for this guy (if the tractor is a non t/a unit) would be to pull start it when it was hot. IF it started right away that to me would make the starter suspect.
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