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Cool in my conversations means what Thrulow said, and has to be taken in context. If you say geez it's cool out here, you're talking about temp. If you say geez man that's a cool tractor, it means that you like it. On the mechanic, if I were asked to check out a piece of machinery for someone, I wouldn't drive it to a mud hole and get it stuck just so I could check out the hydraulics. So a problem of the magnitude mentioned could go unnoticed, even for a competent mechanic.
In my opinion, lifting the front of the tractor off the ground and pulling it forward with the hydraulics is hard work for the system and I wouldn't worry about it.
What's probably happening is that your hyd fluid viscosity is thinning in the heat and you are loosing psi as a result. One way to tell, is to carefully feel a hyd lind fitting or some associated metal with fluid inside. If it's hot to the touch your fluid is breaking down. Whining I associate with vibration. Vibration can be caused by bubbles among other things. Bubbles can be formed when the air trapped in the oil is released like could happen in the situation described. Once the tractor is shut off and the fluid cools, the air goes back into solution....I'm talking about the air that encircles the molecules of the oil that you can't see unless you put the oil in a glass beaker and pull a vacuum on it. Like the reverse of that provess when you run your tractor for awhile and and pop the cover on your tranny and look down at the gears and lube and the lube looks milky (but it's only suspended air you just whipped into it). Good job city boy, just don't be too hard on your equipment. May not last. My 2c Mark
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