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4041 Rear Hydraulics

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I have a 4041 on which the rear hydraulics are not functioning properly. The system will build enough downpressure to lift the rear of the tractor off the ground when I lower a rear-mounted implement, but it will not raise an implement off the ground. It seems to be working correctly in only the one direction. I can lift the implement off the ground by hand and it will stay up in the air until I lower it again. The system has the proper amount of fluid in it, I have installed a new filter, and the hitch is adjusted properly. Also, the front hydraulics work fine. Any help on where to begin looking to fix this situation will be appreciated.

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