Idler pulleys were used to turn the belt drive 90 degrees at the rear of the tractor to drive the mower.I live in a subdivision and the Tri-Trac is really popular there, Kenny says.This 1954 David Bradley Tri-Trac, owned by Kenny Wilson, Carl Junction, Mo., was among the displays at a 2013 show in Pittsburg, Kan.
David Bradley Tractor Manual Showing TheIllustration from the Tri-Trac operators manual showing the units key controls. This photo of the David Bradley Tri-Trac sickle bar mower shows use of the tractors belt drive. This illustration of the Tri-Trac shows how the unit is hinged in the middle. The tractor was built from 1953 to 1957 and about 4,000 were produced. Lets start this discussion by taking a brief look at the David Bradley Mfg. Co. After working for his brother in Syracuse, New York, he moved to the Midwest in his early 20s. He was involved with the first foundry built in Chicago, bought a plow company and, by forming a partnership with Conrad Furst in 1854, established Furst Bradley Co. This prompts an interesting question (but one with no clear answer): Was this plow developed before John Deere invented his steel plow in 1837. City leaders later changed the communitys name to Bradley in honor of the man (who died in 1899) and the company. Sears continued manufacture of implements that were sold through the companys mail-order operation. ![]() Some, such as farm wagons, were built by other companies, but were sold under the David Bradley name. Four-wheel lawn tractors made their debut in the 1950s and were also a huge commercial success. The single rear wheel, with a 7-50 x 16 tractor tire, was powered by a single-cylinder air-cooled mid-mounted Wisconsin engine that delivered 6.1 hp at the rated speed of 3,200rpm. Started by a rope pull, it had a 2-78-inch x 2-34-inch bore and stroke resulting in 17.8-cubic-inch displacement. The units variable speed drive provided ground speeds of 2-14 to 4-12 mph forward and 1-34 to 3-12 mph in reverse at rated engine speed. Adding 115 pounds calcium chloride to the rear tire, a 73-pound inner and an 83-pound outer rear wheel weight, a 200-pound operator and a full tank of gasoline brought the weight up to 855 pounds at the rear and 495 pounds in front for a total of 1,350 pounds. A 3-14-gallon fuel tank (located in front of the steering wheel) was claimed capable of providing a minimum of 4 hours operating time. Tread width for the front axle (with two 4:00 x 12 tires) was adjustable in 2-inch increments from 48 to 72 inches. Turning radii were 8 feet at minimum tread width and 10 feet at maximum, which resulted in wide turns. The Tri-Trac was never tested at the Nebraska Tractor Test Lab, but four David Bradley two-wheel garden tractors and a Suburban lawn tractor were. The mower was driven by the tractors PTO that consisted of a 4-inch diameter pulley located behind the bulge on the left side of the sheet metal enclosure.
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