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Been there. Sounds like a broken or stuck control valve return spring (also called a backup spring). When the lift control is moved to the "raise" position an internal cam in the pump turns in to "push" the control valves forward allowing oil to pump into the rams. When the control is moved back to the hold or lower position a backup spring is suppose to push the control valves back to the bypass position. Another possibility is that someone has opened the pump at sometime and installed these control valves (four of them in a line) backwards. Either way its a relatively easy fix (if that's all that's wrong with it and you can find replacements for broken parts) *once* you get the pump off the tractor. The first time you do one is quite a learning experience. Depending on why the control valves are sticking it way be worth your time just to buy a rebuilt pump (~$275) as you can sink a lot of time in one since the only way you (and I) have to test it is to put it back on the tractor (another learning experience BTW). The good news is that once you get the knack you can yank the pump off, make your next "adjustment" and slap it back on the tractor in under 30 minutes. Do that five or six times and you're a pump pro. Get the pump off the tractor and I'll step you through the disassembly process. If you decide to tackle it yourself and have a digital camera, take lots of pictures and maybe we'll submit an article to ytmag on this style of pump. (If there's one in the archive, I couldn't find it.) David
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