The ex-Esteghlal coach took charge of the Tabriz-based football team on a three-year contract.
Tractor had negotiated with Ali Daei and Farhad Majidi too.
Mansourian has replaced Saket Elhami in the team.
He has not coached a team since parting ways with Zob Ahan in December 2019.
The 48-year-old trainer started his coaching career in 2009 as Pas Hamedan coach and has headed Iran U-23, Naft Tehran and Esteghlal since then.
Tractor will participate at the next year’s AFC Champions League play-offs qualification as champion of Iran’s Hazfi Cup.