Abstract: The caterpillar track attachment is provided for a vehicle having a drive shaft and a steering mechanism. The attachment comprises a pair of endless caterpillar tracks for propelling the vehicle, a frame for supporting the vehicle, drive devices to be operatively connected to the drive shaft and engaging the tracks for transmitting motive power from the drive shaft to the tracks, and a hydraulic device to be coupled to the steering mechanism for providing at least one hydraulic fluid outlet controlled by commands from the steering mechanism. The frame has securing devices for connecting the vehicle onto the frame, and a pair of spaced apart elongated side members around which the tracks are respectively mounted. Each of the members has front and rear sets of wheels located substantially at its front and rear extremities for guiding therearound the corresponding track, and straight slides located at its lower portion between the corresponding rear and front sets of wheels for guiding the corresponding track.