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Hey, that's great news, Roger! Congratulations on a successful completion of a pretty daunting task.
You have a restriction in your steering system somewhere that is causing it to build pressure when under load. There should be a pressure relief valve somewhere in the system, probably in the steering motor would be my guess – check your manual and then check the relief valve. You may want to install a pressure gauge in teh system so you can tell what pressure you are developing, too. There's no other way to properly set the relief valve, and a gauge would tell you if the seal is blowing below a reasonable pressure, say 2300 psig.
Squirt everything involved with a mixture of half and half acetone and Automatic Transmission Fluid (ATF), or use WD-40. Let it sit overnight and then take a small hammer and tap everything several times until it loosens up – don't wail away on it with a big hammer, just tap it to vibrate it loose. The odds are the linkage just has developed a bit of rust that is making it stick.
You may also need to try rocking it forward and reverse with the clutch while applying pressure tot he lever.
On the menu bar near the top of your screen is a tab labeled “Our Dealers.” Click on that and get the contact info for Affordable Tractor Sales or Circle G Tractor, both of them should have what you need and both of them are great people to work with who offer lots of help and advice to the members here.
I agree with your notion of having your torque wrench calibrated – measuring tools are only as good as their calibration. Testing yours against another unknown one can do nothing more than confirm a superstition, but it can't provide real certainty. On stressed assemblies, torque really does matter, so do it right. You wouldn't trust a $9.95 HF digital caliper to measure journal clearances would you? Nope, you'd want a real, calibrated micrometer.
Probably a clutch problem. Sounds like it isn't completely releasing the 2nd stage that controls the PTO. Could be the shear pin in the linkage, could be mis-adjustment, could be a worn clutch, depending on the number of hours on the tractor, style of driving and whether or not the clutch was properly adjusted when the tractor was first put into service.
If yoiu use a PTO pump you most assuredly will need a reservoir. You could theoretically operate with just the fluid in the cylinder volume, but you'd have to “rest” the machine after every second log to let the oil cool back down. Maybe every log, if they're tough. A reservoir is cheap and fluid is not consumed, so get a decent-sized one.
