"Labor is the common name for robots developed for industrial use. Their use became widespread in construction and civil engineering, but Labor-related crimes skyrocketed as well. To combat this, the Metro Police created a Patrol Labor unit: The Special Vehicles, Division 2 (SVD). This was the origin of the Patlabors." — from the OVA's intro

SVD has received something new: a faster and more powerful robot called the AV-0 Peacemaker. So far, its existence is a closely guarded secret... but not from everyone. There is a new Labor in town (painted in an ominous black) called the Type J-9 Griffon... and it is out to cause trouble!

Source: AnimeNfo

Note: Regarding the r1 version, the distributor shuffled the episodes around so that the Japanese and US order do not match by default.

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Prequel: Kidou Keisatsu Patlabor: Patlabor on Television