Abstract: A roller slide apparatus for mounting heavy equipment on support structures and which allows safe repositioning of the equipment for servicing and repair includes a lower plate assembly connected to a support structure, an upper mounting plate connected to the equipment, and a bearing assembly connected to both the lower mounting plate assembly and the upper mounting plate for facilitating movement of the upper mounting plate from a first operative position where the upper mounting plate is substantially superimposed over the lower mounting plate assembly to a second operative position where the upper mounting plate is moved away from the lower mounting plate assembly. Locking devices for maintaining the upper mounting plate in either the first or second operative positions, includes flanges formed on the mounting plates and extensions that slide into holes formed in flange or plate elements.