The Ransomes, Sims & Jefferies Co. MG series single-cylinder four-stroke engine crawler tractors were designed to operate on small orchards, vineyards and market gardens. They were often fitted with power take-off drive and hydraulic three-point linkage. The first Model MG2 was released in 1936. This small tracked design was popular in the United Kingdom with other similar designs being by other manufacturers such as the Bristol Tractor Co. A total of about 15,000 Ransomes MG series tractors were built including about 1370 of the later MG40s. In Victoria the local importer for Ransomes crawler tractors was Ruston & Hornsby Ltd. In NSW they were imported by the Demco Machinery Co. Ltd in Redfern.

The Museum's example is a Model MG6, (Serial No.9544), built around 1958. Manufactured by Ransomes, Sims & Jefferies Ltd., Ipswich, Suffolk, England. With single-cylinder vertical air-cooled side-valve petrol engine. This tractor was donated to the Museum in 1995 and is currently operated at Scienceworks as part of the activated exhibits program. The engine bore is 3.420-inch (86.8 mm) x stroke: 3.976-inch (101 mm), with a capacity of 600 cc.

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