I have recently taken on a 120 acre farm reclaiming. Everything was so over grown with stubble and briars you couldn't walk it. I consulted Conservation and local MFA for help. We decided that the best thing to do was mow it and then get a bottom plow and turn it over. I have started with a 20 acre field. Mowed it all down in late fall. Now I have picked up this 3 bottom plow that I believe is a Ford. The only marking I have found is a "6" on the rail behind the middle plow. It has sat in a field for years but is still solid. I replaced all the grease zerks and greased well. I also replaced the adjustment bolt on the R/S that was broken. Off to the field I went. It does very well in the easy stuff but when I hit the briar stubble and ect. the L/S plow started tripping. I can swing it back into place and it snapps right in. After 4-5 laps around the field it is the only one that continuously trips. Is there an adjustment to tighten the trip mechanism? Also what kind of adjustments do I make with depth, speed, and the adj. bolt that changes the angle. Also, do I plow in straight lines back and forth or do I go around in a circle like mowing. I am really just learning and would appreciate all the help there is to offer. I am pulling with a Ford 4000 50 hp tractor.