Abstract: A tool for in-place removal and replacement of large roller-type links of heavy duty chains adapted for use in industrial settings. The tool includes a detachable back support, a front support and a drive mechanism. The front support includes a plurality of holding bolts. The drive mechanism is secured to the front support and includes a crossbar and a plurality of drive screws. To remove a side plate of a link, the drive screws are aligned over the ends of the link pins and the back and front supports are secured to each other around the link with the holding bolts. The drive screws then are rotated to force the side plate of the link from the link pins. To reassemble the link, the crossbar is aligned with the side plate and the back and front supports are secured to each other around the link with the holding bolts. Tightening the holding bolts moves the crossbar to apply even pressure against the side plate thereby forcing the side plate into position in the link.