The growl could also be the fan blades cavitating due to the radiator being plugged with snow, for example.
Did it go away? If so, don't worry about it.
Did the tractor run and drive once you got it warmed up? If so, don't worry about it. Hydraulic oil doesn't pump well at that temperature, and it takes forever to warm up just sitting there idling. A pump might be getting a little weak, but that's just a guess.
With tractors like this you almost have no other choice but to run it until it breaks down, so the problem can be found and fixed. You could spend thousands replacing things "preventatively" and still not fix an intermittent problem like you describe.
You didn't destroy anything with what you did. If anything is broken, it's from decades of wear and tear, not one cold start.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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