The Zetor 16121123 is a genuine OEM main gearbox shaft designed specifically for Zetor Z-21 series tractors. This critical component ensures the proper functioning of the transmission system, facilitating smooth gear changes and reliable power transfer. Manufactured to Zetor's exacting standards, it guarantees durability and precise fitment, maintaining the original performance specifications of your agricultural machinery. This shaft is essential for maintaining the integrity and operational efficiency of the gearbox.