The Trunion and linkages look good...I did not change the relief valve, should I have ?....I will have to re-check the oil that I put in it, however, the oil that I put in was suggested for hydro transmissions. the filter is a Purolator that I cross reference from the filter that was on it.
I also need to mention that I forgot to in the original post, is that when I "hold" the hydraulic lift lever in the down position or the lift position it will drive fine (no lurching).
The only thing's I did was add hydraulic lift, change hydro oil, and hydro filter.....before I did these things the tractor drove fine.
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