An internally fluted feed wheel, popular for large, fragile seeds such as beans. Pivots between components can improve tracking on curves. Pull-type drills will track better on curves than mounted drills, but mounted drills will track better on hillsides. Some no-till drills have the coulters on a caddy unit that places the coulters far ahead of the openers. Investigate tracking features if these units are to be used on hillsides or curves.
Some caddies have a pivot to improve tracking on curves.
Mounted drills require larger tractors, perhaps 10 to 15 horsepower per foot, to have sufficient front-end weight and hydraulic capacity to lift the drill. No-till drills pull slightly harder than conventional drills, but the rolling resistance of a tractor operating on firm soil is much less than on tilled soil. There is considerable distance with some caddy units between the no-till coulters and the disk openers. Thus tracking may be a problem, especially on hillsides and curves. The drilling depth is usually determined by the coulter operating depth, with a minimum of down pressure on the openers.