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Dave: Semi mounts are basically a cross between a trailer and mounted plow. Your hitch lifts front of plow while a tail wheel lifts the rear. They are a two lever function, going into as well as out of soil. In both cases you activate your hitch first then the remote valve for tail wheel. As Wayne said the early ones just had a caster wheel behind, while later ones had the steerable tail wheel. The models with steerable tail wheels also pivoted side ways at tractor hitch, to allow turning. My 1066 on 5x16 semi mount could leave headlands as short as 12' as you can start to turn as you raise or lower plow. They have a ty rod run from tractor hitch to tail wheel. My plow was an IH 510 which is steerable and behind any of 06, 56, 66 or 86 series tractors. Those tractors would complete the hitch function before remote valve functioned thus the plow entered and exited soil just like a trailer plow. When I bought my plow, my dad was a dyed in the wool trailer plow man. An older neighbor who also did a lot of tractor work for me was probably as firm on the trailer plow issue as my dad. When dealer delivered plow, he hitched it to 1066 and I asked him to leave manual in cab. Tractor was some distance from farmstead. My dad and friend knew what I wanted plowed. I also knew, that new plows are not adjusted very well. I knew those two would take the time to do it right. Three days later I get a phone call from them, "We need diesel fuel." I said, "there is about 100 gallons in tank where you are." "Oh". was the responce, "We have that all burnt and need more." I always had a tank on pickup for fueling tractors in field, so went up. They plowed close to 300 acres that fall and I got to do 5 acres. I'm not sure which they liked the best; semi mount plow or the cab. They told me I had a lifetime to plow in a cab, they had spent 40 years freezing doing Nov. plowing. I noticed, the next spring my dad took 1066 and 5x16 semi mount to plow his garden, 130 with 2x12 fast hitch had always worked in the past. This garden was afterall, the retirement garden after family was all grown and away from home. New toys do wonderful things to old men.
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