The D19 tractor is described generally, with design objectives and how these were accomplished. The D19 is a 5 plow tractor in the 70 hp class. Gasoline, LPG, and diesel tractors use a basic 6-cyl 262 cu in. engine. The diesel is turbocharged. All tractors use dry air cleaners, and incorporate traditional features: adjustable tread front axle, power shift rear wheels, two speed hot shift with live power take off and a new split pump traction booster hydraulic system.