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The tractor carries some or all of the weight of the implement. The other main mechanism for attaching a load is through a drawbar, a single point, pivoting attachment where the implement or trailer is not in a fixed position with respect to the tractor. The primary benefit of the three-point hitch system is to transfer the weight and ...
A large ballast tractor pulling a load using a drawbar General duty tow hitch from VBG on a truck and a drawbar on a trailer, showing a connected drawbar eye Rockinger drawbar coupling, in which the drawbar eye gets locked. A drawbar is a solid coupling between a hauling vehicle and its hauled load. Drawbars are in common use with rail ...
The Farmall B is a small one-plow row crop tractor produced by International Harvester under the Farmall brand from 1939 to 1947. It was derived from the popular Farmall A, but was offered with a narrow set of centerline front wheels instead of the A's wide front axle, allowing two-row cultivation.
In contrast to the letter series row-crop tractors, which were intended to straddle one or more rows in a field with high clearances and adjustable axles, the W tractors had fixed wheel widths and a generally lower profile with smaller rear wheels and wide front axles, since they were meant for plowing, orchards, wheatfields and other applications that did not require the row-crop features.
At 1600 rpm, early versions of the C-60 engine produced 9.25 horsepower (6.90 kW) on the belt and 8 horsepower (6.0 kW) at the drawbar. Starting in the 1960s, Cub engines steadily increased power with higher rated RPM's, peaking at 15 horsepower (11 kW) for the International Cub and 154 Lo-Boy by 1975, and 18 horsepower (13 kW) for the 185 and ...
Farmall Super BMD, a Super MD produced in Britain. The Farmall M is a large three-plow row crop tractor produced by International Harvester under the Farmall brand from 1939 to 1953.
"By this means the major portion of the load on the lorry can be transferred to the rear part of the tractor, and this increases the load on the rear wheels (the drivers) of the latter, and consequently the adhesion." They make the point that "The tractor system, of course, means in effect an articulated six-wheel vehicle".
However, where soil conditions permitted, direct hauling of implements ("off the drawbar") was preferred; in America, this led to the divergent development of the steam tractor. This aside, American designs were far more varied than those of the British with different boiler positions, wheel numbers and piston placements being used. [2]