How is down-pressure maintained on the row units?
There is uniform down pressure and infinite depth control on all of the row units, regardless of the size of your tool bar. Each row unit has a 16″ air bag similar to those used for air ride suspension on over-the-road trailers. The air bag creates down pressure on the Deep Till or Shallow Till coulters, which are mounted on parallel linkage to the toolbar. The 7″ x 7″ toolbar also acts as a full-width air chamber. Air pressure is maintained either by the tractor’s system or an auxiliary compressor mounted on the machine. A controller in the tractor cab regulates pressure from 5 to 60 psi. Lower psi is used in softer conditions and higher psi is used when soils are compacted or dry. One large adjustable gauge wheel on the front of each row unit maintains depth control.
