674 IH Hydraulic Issues

674 IH. I changed the hydraulic filter - started the tractor but nothing would work - I took the bolt out on the bottom below the filter and bled the system, and it began to work but it was very slow when raising the front bucket and wouldn"t lift much weight. However, the 3 point will pick up my 6ft box blade very well but goes down very, very slow. I re-bled the system the second time, but no new results. Still doing the same. Any advice? Thank you
-WHB
 
Better to post this on the Farmall/IH forum. If you're lucky, the problem is that the unloading valve (it's accessible via a hex plug under the seat) has a bit of crud in it -- usually the lining from the parking brake.
 

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