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On older Zetors the door hinges are on the front part of the door, and the later Zetor x1xx series had a new cab, and the 4 cylinder engines had counter balance shafts.
On the xxx2xx series Zetor-ZTS the 6 cylinder tractors had a stronger rear axle, and modernised engines. Ursus still uses the 1968 design of 4 cylinder engines.