rret: Probably 99.9% of all intended uses on 3 point hitch requires no down presure. In fact most 3 point hitch implements would be damaged by tractor weight when going over uneven ground. The items that wouldn't be damaged like plows, disks, rear blades, etc. would lift the tractor's rear wheels causing it to loose traction.
I expect one could argue have down a down presure position on hydraulic control, and if that were the case it would probably be necessary to tripple the weight of 3 point linkage to withstand tractor weight. Couple that with the fact factory 3 point hitches are draft controlled and probably represent close to 12% of the total cost of the tractor. The 3 point hitch was designed as a precission control hitching tool, not a jack for lifting the tractor.
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Today's Featured Article - Ford Super Dexta - by Anthony West. The rusty blue tractor caught my eye as my truck zipped by the farm implement business. It looked so fornlorn amongst the lineup of newer equipment. But it was just the right size for my small farm. I stopped in and asked the proprietor for further information. "It's a 64 Ford Super Dexta", he said. "It's a tough little tractor, although it's a hard starter being a diesel and all." He did manage to get it running, compliments of a can of ether. Once started it putted along pretty good. It
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