A generator housed in a wind turbine nacelle includes a generator rotor that is mounted to gearbox output pinions, thereby eliminating the need for couplings. The generator frame is located directly on the gearbox and is located to control the air gap. To facilitate removal of the generator, tapers are used that have steep angles that exceed the friction coefficient of the materials used. To provide adequate support over its length, the shaft employs dual tapers, each short and precisely located conical surface of which provides exact location on the near and far sides of the shaft. The length of straight shaft between the dual locating tapers serves to support the generator during mounting and de-mounting. During installation, the tapers center the rotor and bullet pins center the frame (stator). When the system aligns the rotor and stator, retainer elements act as labyrinth seals designed to protect the generator interior from contamination.