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Hello, Greg - Possibly loose linkage. Top 3-point connection? If this is loose front to back, constant pressure forward (I think) can keep the arms up. Otherwise, something inside. You can inspect it through the right cover plate - the one with the transmission oil level dipstick on it. You'll have to drain a gallon or two of oil out of the transmission, or run the right wheel up on a 6x6 block (or sloped ground) before removing the cover. If you break the gasket, silicone caulking works well as a replacement. Inside, there are two thin levers dropping from the cover to contact the pump actuating lever top roller just about at the oil level. Both move the pump lever back an inch or so in response to draft and position control (quadrant lever) movement, to raise the lift arms. In the down position, the pump lever is fully forward. From your description, something is preventing this from happening. Be sure the unit is well blocked to prevent rolling! See if the forward/backward movement is there. You can start the tractor at idle speed, and move the pump lever carefully with a wooden stick to see if the arms are lifting/lowering. If so, the control valve is ok, and the linkage is out of whack - the I&T manual is your best help for re-adjusting. This can be done without removing the top cover. Hope this helps; let us know how you make out.
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