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AUSTRALIAN TRACTOR TEST REPORT
The Zetor 5511 is a general purpose farm tractor. With 43 drawbar horsepower and 51 h.p. at the P.T.O. at rated engine speed it comes within Class 5 of Australian Standard Classification of Wheeled Tractors for Agricultural Purposes, A.S. Dl0-1967. It is equipped with 18.4 x 28 pneumatic tyres.
It has a five-speed gear box with a High and Low ratio change giving 10 forward and 2 reverse speeds
Vasey, G H. and Baillie, W. F.
"Australian tractor test report. No. 56. Zetor 5511,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 11
, Article 8.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol11/iss6/8