354 3pt update with new problem

put new orings in the block infront of the seat and seemed to stopped the leaking but i am having trouble with the 3 pt lifting. when its lifting it struggles to raise up and the hyd lines are jumping ever sec or two. after i put it back together it seemed to be working good for about 5-10 mins and started jumping and not raising good. thought it might be the pump so put on a spare i had and it done good for a few raises up and down then it started jumping as well. any ideas what this problem is? im gonna take the filter off on the return line under the seat in morning and check it not sure if that is problem or not but it will be a start i guess. any ideas let me know. thanks again for help.
 

If it's similar to a 454 there is a vent hole with a cap that needs to be cleaned periodically. It's under the seat near the rear.
 
i dont see no vent like your talking about and the the return filter is not stopped up, so i have no idea what is wrong with it.
 

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