Repair crab

Repair crabs are Transformer technology from the Marvel Generation 2 portion of the Generation 1 continuity family.

Surrender your mysteries to Zoidberg!

Repair crabs aid in a Transformer's repair, scuttling over the surface of the body reactivating disabled components. The unnamed crab-shaped technology is attached by lengths of cable to much larger machinery.

Fiction

Marvel Generation 2 comic

After Optimus Prime was damaged severely in battle with Megatron, repair crabs worked to restore his body. Tales of Earth, Part Four