Ports America replaced APM early this year as the terminal operator of berths 20-24 in Oakland and is upgrading equipment and facilities under its 50-year concession.
Massport announced the $15 million acquisition of the pre-owned cranes in early August. The price includes the cost of transportation and installation.
The low-profile cranes are needed because the terminal is under the flight path of a runway at Boston Logan International Airport.
The new cranes increase the total number of dockside cranes at Conley to six and rubber-tired cranes to 12. The cranes are part of the port's modernization effort in preparation for handling larger vessels that could call on the port with the expansion of the Panama Canal by 2015.