Hello,We recently purchased a 1980 IMT 539. It's been running well. We are now having problems with the hydraulics. It was working well, raising and lowering perfectly, no sinking effect. Life was good. Now, nothing. Absolutely no lift at all. We have taken off the lift cover. The mechanism there appears to be okay. We ran the tractor with the lift cover removed but with the hydraulic fluid in the center housing. We could see the fluid moving around from the pump activity, but nothing ever came out of the stand pipe. Should we expect fluid to come out of the stand pipe when the lift cover is removed? What should the fluid look like? Ours is a creamy yellow. Is there a filter on the hydraulic pump? We haven't been able to find one and our service manual makes no reference to it. Will parts for a MF35 hydraulic pump work with our pump? Are there some other tests we can run to try to issolate the problem? Any help would be greatly appreciated. thanks, cindy
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