How draft control works

If the plow is actually raising then the draft control is incorrect. You should set the plow according to the toughest portion of the field and if your ground requires your tractor to be heavier then the farmer puts wheels weights on accordingly. I saw a tape done by Allis where they took a tractor and locked out the traction booster and gave the tractor a measured quart of gasoline and was able to plow 1,200 ft then with the same tractor and 1 quart of fuel and this time using traction booster They were able to plow 1,500 ft. Both times they started with an empty carb. That's quite a fuel savings.

Evidence for me is plowing with my little D17 and easily outperforming a tractor with 10 more hp that is pulling 1 bottom less in very hard ground.

However, on a mounted plow, the draft is actuated by torque load, it controls the suck/depth of that plow and the tractor is already carrying the weight of the plow to a large degree.

Suck is pulling "down" like you wouldn't believe. Tractor and draft are constantly trying to pull it back up out of the ground to maintain the correct level as set by the draft lever.

It's a continual give and take action and you can watch it work by watching the lift arms.

If you don't believe it, pull the position lever back up out of the "run" position. You'll feel it cylcle just about every two to three seconds as the suck of the plow pulls itself back down deeper and the hydraulics will then correct again by raising the plow.

Plow weighs the same to the tractor wheather it is in the ground a foot or out of the ground the same amount (not counting the balancing act on the guage wheel).

Stop the forward motion and the plow "weighs" less as far as the tractor is concerned because there is no suck.

Don't know how Allis tractors work; never owned one.

Allan

Allan