Unless you somehow destroyed the wiring, very little. And the only kind of required maintenance is changing bearings (should last a decade, or two) or brushes (some motors don't have them, the ones that have require changing every few years, and they are quite cheap). Any other kind of repair is done only after some kind of abuse.
An electric motor also has no cooling, no transmission, simple lubrication, no starter engine, in short, nothing that breaks. But it has a huge battery...
Unless you somehow destroyed the wiring, very little. And the only kind of required maintenance is changing bearings (should last a decade, or two) or brushes (some motors don't have them, the ones that have require changing every few years, and they are quite cheap). Any other kind of repair is done only after some kind of abuse.
An electric motor also has no cooling, no transmission, simple lubrication, no starter engine, in short, nothing that breaks. But it has a huge battery...