I bought a 460 it has a whine in the hyd pump area until i engage the pto then it quites down. It has a planetary drive pto. I have 2 other 460 that have disk drive pto and they dont have the noise. It is full of hyd oil.
 
That is quite normal with the planetary PTO. Some are louder than others but it is rare not to hear the whine when the PTO is off. Just make sure the PTO is filled to the correct level with oil and ignore the noise.
 

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