Abstract: A holder block assembly for a drum-type cutting tool has a holder block, a sleeve, and a piston carried in a piston channel formed in the holder block. The sleeve includes a shank and an enlarged flange at an end of the shank. The sleeve shank is received in a hole in the holder block, with the shank and hole wall forming a number of axially spaced interference fits. A source of pressurized fluid applied to the holder block forces the piston against the sleeve to extract the sleeve from the holder block. Sealing structure between the piston and the holder block prevents the release of hydraulic fluid when the sleeve is released.

Abstract: A cutting tool has a holder block and a sleeve. The sleeve includes a shank and an enlarged flange at an end of the shank. The sleeve shank is received in a hole in the holder block, with the flange against a surface of the holder block and the sleeve shank facing the holder hole wall. A first fillet extending between the holder bore wall and a second fillet extending between the sleeve shank and sleeve flange cooperatively form an annular flow passage for flow of water from the holder into the sleeve.