A housing mount assembly for a TBM disc cutter assembly having a shaft and cutter wheel assembly includes a housing half with a body and opposite edge portions extending away from the body. A removable seat block is fixed to the housing half in a space between the edge portions, and is configured to transmit forces received from the cutter shaft to the housing half in shear. A first face of the seat block is pressed against a face of one of the edge portions, and second face is pressed against the housing half body. The seat block may be preloaded against the housing half with first and second pluralities of bolts arranged perpendicularly. The seat block is configured to be removable in the field without removing the housing half from the TBM. The seat block may be hardened to a Rockwell C hardness in the range of Rc 58 to 60.