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I doubt you have damaged it in any way, the control linkages on these tractors can be a little fussy sometimes. Has the hydraulic fluid been changed recently? If not, it may just be some debris has lodged in the control valve (inside the hydraulic pump). A fluid change would probably fix this. Or, it could be the linkage is temporarily 'stuck' out of position causing the control valve not to function correctly. I have had this happen to me when I backed into a pile of snow too hard with my blade. It pushes on the top link real hard and that will move the linkage around in there. What I would do is remove the inspection covers on each side, with engine NOT RUNNING, and stick one hand down in there on the control linkage where it connects to the pump. At the same time move the control quadrant up and down, so you can determine if the control valve is sliding in and out of the valve body smoothly. You might have to kind of pull/push on it with your hand that is inside the tractor, to free it up if it stuck on something. After you determine the valve is moving freely, remove your hands and start the tractor up and see if the lift doesn't start working again. While you have it opened up, take a look inside there for any obvious hydraulic fluid leaks or drips. Also, any 'swirling' of the fluid at the back side of the hydraulic pump. There shouldnt be any. If there are then you have leaky seals or perhaps a blown pressure relief valve. Post back about this with a description if you see fluid leaking/swirling. The guys will tell you what to do to fix it. If the fluid has not been changed in a few years or it looks 'milky' (which means it has water in it) I would reccommend changing it. There are three drain plugs on the bottom of the tranny and rear end. Five gallons (or close to it) will drain out so make sure you have an adequately sized vessel to collect it in.
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