The Zetor 78002184 is a genuine OEM upper main bearing, specifically designed with a 0.75mm undersize for crankshaft repair in various Zetor tractor models. This precision-engineered bearing ensures proper fit and function, restoring engine integrity. Compatible with a wide range of Zetor tractors, including the 3320, 3321, 3340, 3341, 4320, 4321, 4340, 4341, 5320, 5321, 5340, 5341, 6320, 6321, 6340, 6341, 7320, 7321, 7340, 7341, 7711, 7745, 8011, 8045, 8111, 8145, 8211, 8245, 9211, 9245, 10111, 10145, 10211, 10245, 11211, 11245, 12111, 12145, 12211, 12245, 14145, 16145, 16245, and 18345 series.