Whiney 4030

I bought a 4030 this last winter and used it with a three point implement for the first time yesterday, a 350 mower.
Anyway after driving it a few miles to a field to mow, my son asked me if it always smelled like hot oil. To be honest I haven't used it enough and had it warmed up enough to really know.
After doing some mowing we noticed a whine in the hydraulics. About the only time it doesn't whine is when the three point is being moved up or down.
I would imagine I have some sort of bypass problem, but where do I start? Is this a valve problem or an adjustment issue? Could the way a 350 is tied to the tractor's hitch as a depth stop be part of what's causing it?
 
It's not likely the mower is causing it,, but the 3point could be out of adjustment, or a leak in the valve area..
 

It's possible rockshaft control valves are too tight. A good place to start would be adjust L/D mechanism as outlined in a JD service manual. Where is L/D lever setting in min. or max.?? For mower operation in should be in minimum.
 

Thanks for the info. I'm going to go over and take a look at it this afternoon. I do have a tech manual so I will look at the the adjustment.
 

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