Dave: Go with the simple and least expensive first options. With tractor at low idle, move each hydraulic lever slowly through it's range, listening for unusual sounds or change in sound. I'm not saying 100% this is a lever problem, it may be more serious, but there no point in your tearing into it, if it's as simple as lever metering. You have two adjustments on each lever, first is the yoke on the rod coming from the lever, and secondly there are limit blocks on the underside of touch control unit were the activation enters. You really should have a service manual for adjusting the latter.
Now, we go to the engine and governors. It is on the right front of engine, where you put the oil in. I've never had this off my 140, I suspect it can be done by first removing the fan shroud. I know they all come easiest with the radiator off. Just 3-4 bolts hold the governor case to engine casting, and linkage from throttle lever and on left linkage to the carb. Inside you will find hinged centrifical weights, those rarely cause problems. There is a spring conecting input and output shafts and those damn springs seem to break every 30-40 years. Also there is a thrust bearing and those seem to fail every 30-40 years. I'd have both of those new before I tackled this, They are both relatively inexpensive items, plus you've done too much labor to leave old spring and bearing. There will be some adjustment required after you reassemble this. There are guys on here right up on that adjustment. It's been 15 years since I had one apart, thus I'd have to follow the service manual.
Back to your hydraulic problem, I've had to adjust those lever several times over the years. It can be as simple as a tree limb has moved the cage around the levers, changing the stop limit on the levers. I've also bumped the cage doing other mechanical work on tractor. If it becomes more serious like a rebuild kit for the touch control unit, I've never changed one, but there a a host of folks on here who have done. Usually the main reason for the rebuild kit is the touch control unit leaking, however there are items inside that can stick or jamb up.
Finally you need to get a wee bit more precise in your descriptions of exactly what is happening, and when. Do you have a service manual, this could help as most folks working on these are using service manual language. Just keep your cool, any of us that have owned one of these tractors for years have been through what your going through. Believe me, it doesn't happen often, and when it does, a Super A, 100, 130 or 140 don't destroy your pocket book.
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