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Deere & Company, doing business as John Deere (/ ˈ dʒ ɒ n ˈ d ɪər /), is an American corporation that manufactures agricultural machinery, heavy equipment, forestry machinery, diesel engines, drivetrains (axles, transmissions, gearboxes) used in heavy equipment and lawn care equipment.
Three new 4WDs came to market in the fall of 1981; these were the 225 hp (168 kW) 8450, 290 hp (220 kW) 8650, and big 370 hp (280 kW) 8850; the 8850 came with the company's biggest engine, the 955 cu in (15.6 L) V8 engine; Besides the 8850, the John Deere 844 wheel loader and 990 hydraulic excavator were the only other John Deere products to ...
A hydraulic tappet, also known as a hydraulic valve lifter or hydraulic lash adjuster, is a device for maintaining zero valve clearance in an internal combustion engine. Conventional solid valve lifters require regular adjusting to maintain a small clearance between the valve and its rocker or cam follower. This space prevents the parts from ...
Desmodromic poppet valve in a Ducati engine. A desmodromic valve is a reciprocating engine poppet valve that is positively closed by a cam and leverage system, rather than by a more conventional spring. The valves in a typical four-stroke engine allow the air/fuel mixture into the cylinder at the beginning of the cycle and exhaust spent gases ...
A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...
The upper part of the valve stem, within the rocker box, is lubricated by oil. If this oil travels unchecked along the valve stem, engine HC emissions will become excessive. To control this, an elastomeric seal is fitted over the top of the valve guide. These may wear or stiffen with age, so are usually replaced whenever valves are removed for ...
The 60's replacement was the John Deere 620, in 1956. Engine power was increased again by reducing engine stroke by 0.375 inches, increasing the rpm. [9] The Orchard 620 or O-620 used the new 620 engine and remained in production after the 630 was introduced. It was the only "20" series tractor in production after 1958. [2] [10]
The L was first produced in 1937. Unlike most John Deere tractors, it was designed in John Deere's Dubuque Wagon Works plant in Dubuque, Iowa, and did not resemble previous Deere products. It departed further from tradition by using a non-Deere engine, a Hercules two-cylinder engine mounted in line, rather than transversely, as had been ...
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