The Valmet 6600 is a row-crop tractor produced from 1991 to 2000 as part of the Mezzo Series. It features a turbocharged 4-cylinder SisuDiesel 420 DS engine with 103.3 hp (77.0 kW) power output. Transmission options include a 24-speed two-speed power shift and a 36-speed three-speed Delta Powershift. The tractor has four-wheel drive, power steering, wet disc brakes, and a standard cab with optional air-conditioning. It offers a hydraulic pump flow of 18.5 gpm (70.0 lpm) and a rear hitch lift capacity of 12125 lbs (5499 kg). The rear PTO is independent with 540/1000 rpm options. Dimensions include a 91.6 inch (232 cm) wheelbase, 174.2 inch (442 cm) length, and 9700 lbs (4399 kg) weight. Tires are 13.6R24 front and 16.9R38 rear. Electrical system is 12 volts with alternator charging and 150 AH battery.