Abstract: A wall saw for cutting concrete or similar materials includes a track, mounting brackets to affix the track to a wall, and a movable saw carriage. The saw carriage is mounted to the track by a guide mechanism, which may include a plurality of rollers, mounted to the carriage for pivotal movement between an engaged position, in guiding contact with the track, and a retracted position, out of contact with the track, by movement of a carrying handle of the carriage. In one embodiment, the rollers are mounted for pivotal camming motion and are retracted sufficiently in their retracted positions to permit mounting and dismounting of the carriage relative to the track by movement of the carriage perpendicular to the wall.