A removable cartridge cleaner assembly for a conveyor belt, the removable cartridge cleaner assembly comprising: an elongate support configured to extend across the conveyor belt and having a longitudinal axis; an elongate cartridge assembly having opposite ends and belt cleaner blade assemblies secured thereto between the opposite ends thereof for being shifted along the elongate support in an insertion direction; cooperating securing portions (64, 90) and openings (74, 92) of the elongate support and the elongate cartridge assembly with the securing portions (64, 90) received in the corresponding openings (74, 92) upon shifting of the elongate cartridge assembly to an operative position on the elongate support; an insertion device of the elongate cartridge assembly having an elongate lever handle and being configured to pivotally engage the elongate support with pivoting of the elongate lever handle in an insertion direction generating a leveraged insertion force for shifting the elongate cartridge assembly to the operative position thereof, characterized by a coupler device for securing the elongate cartridge assembly on the elongate support; a first pin portion extending from opposite sides of the coupler device and sized for being pivotably connected to the elongate cartridge assembly; spaced guide members of the elongate support spaced to receive the elongate cartridge assembly therebetween; a first slot of the spaced guide members for receiving the first pin portion therein; a second pin portion extending from the coupler device spaced from and extending generally parallel to the first pin portion; a second slot of the each of the spaced guide members spaced from the first slot for receiving the second pin portion therein; an opening portion of the second slot configured to receive the second pin portion therein; and a closed end portion of the second slot configured to provide an operational position of the elongate cartridge assembly with the second pin portion positioned therein and resist shifting of the second pin portion out therefrom toward the opening of the second slot and thereby maintain the elongate cartridge assembly in the operational position thereof, wherein the second slots extend obliquely to the first slots. an elongate support configured to extend across the conveyor belt and having a longitudinal axis; an elongate cartridge assembly having opposite ends and belt cleaner blade assemblies secured thereto between the opposite ends thereof for being shifted along the elongate support in an insertion direction; cooperating securing portions (64, 90) and openings (74, 92) of the elongate support and the elongate cartridge assembly with the securing portions (64, 90) received in the corresponding openings (74, 92) upon shifting of the elongate cartridge assembly to an operative position on the elongate support; an insertion device of the elongate cartridge assembly having an elongate lever handle and being configured to pivotally engage the elongate support with pivoting of the elongate lever handle in an insertion direction generating a leveraged insertion force for shifting the elongate cartridge assembly to the operative position thereof, characterized by a coupler device for securing the elongate cartridge assembly on the elongate support; a first pin portion extending from opposite sides of the coupler device and sized for being pivotably connected to the elongate cartridge assembly; spaced guide members of the elongate support spaced to receive the elongate cartridge assembly therebetween; a first slot of the spaced guide members for receiving the first pin portion therein; a second pin portion extending from the coupler device spaced from and extending generally parallel to the first pin portion; a second slot of the each of the spaced guide members spaced from the first slot for receiving the second pin portion therein; an opening portion of the second slot configured to receive the second pin portion therein; and a closed end portion of the second slot configured to provide an operational position of the elongate cartridge assembly with the second pin portion positioned therein and resist shifting of the second pin portion out therefrom toward the opening of the second slot and thereby maintain the elongate cartridge assembly in the operational position thereof, wherein the second slots extend obliquely to the first slots.