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Primary heavy duty disc harrows of 265 to 1,000 pounds (120 to 454 kg) per disc are mainly used to break up virgin land, to chop material/residue, and to incorporate it into the top soil. Lighter secondary disc harrows help completely incorporate residue left by a primary disc harrow, eliminate clumps, and loosen the remaining packed soil.
The main engine is a two-cylinder, four-stroke, naturally-aspirated 416 cu in (6.8 L) (5.75 by 8.00 in (146 by 203 mm) bore and stroke), direct injected diesel engine, with a 16:1 compression ratio. The starting engine is also a John Deere two-cylinder, 26 cu in (0.43 L) horizontally opposed gasoline engine .
The Caterpillar Challenger MT875B was the most powerful production tractor available during its span with 430 kW gross (580 hp) engine power. [6] In 2007, the MT875B broke the world record for most land tilled in 24 hours with a custom-made, 14 metres (46 ft) disc harrow fabricated by Grégoire Besson. [7] It tilled 644 hectares (1,590 acres).
Modern Kverneland spring-tooth harrow A 12-foot traditional style spring tooth harrow. Note how it is in four foot sections with manual levers to adjust the depth of tillage. Harrows, whether spring tooth, spike tooth or disc harrows can have a drag connection or have a 3 point mounting. A drag harrow is pulled and cannot be backed up.
IH manufactured light, medium, and heavy vehicles for military use. Examples include a Metro van sold to the Czechoslovakian Army in 1938, M5 tractors and 2.5-ton M-5H-6 trucks for the US Navy and Marines in 1942, [59] and around 3,500 2.5 ton M-5-6-318 cargo trucks provided mostly to the Soviet Union and China. [60]
In cooler climates, the most common types are the disc harrow, the chain harrow, the tine harrow or spike harrow and the spring tine harrow. Chain harrows are often used for lighter work, such as leveling the tilth or covering the seed, while disc harrows are typically used for heavy work, such as following ploughing to break up the sod.