Abstract: A gate opener (14) is disclosed for attachment to a pre-existing gate (10) mounted for pivotal motion to a post (12). The gate opener includes a controller (30) for activation by an operator from a remote location, such as a vehicle, to transmit a signal of predetermined frequency to a receiver (32) mounted by the gate. The receiver (32) activates a relay to initiate operation of an electric motor (34) to open or close the gate. The rotating motion of the motor shaft is transferred through a set of pulleys (37, 39), a belt (43), gears (48, 54) and a chain (58) to a wheel (38) in contact with the ground. A gate opener (100) forms a second embodiment of the invention. The gate opener (100) is supported by a parallel arm hinge assembly (104) so that substantially the entire weight of the gate opener (100) is supported on the ground (40) through the ground wheel (132) to provide traction to the ground wheel.