A mounting assembly for mounting a diesel oxidation catalyst system at an under-hood location of a work vehicle, the mounting assembly comprising: - a support bracket include a first side and a second side opposite the first side, the first side defining a first mounting surface and a second mounting surface, the support bracket including a first fastener opening defined through the first mounting surface; and wherein said mounting assembly further comprising: - a mount plate configured to be coupled to the first side of the support bracket, the mount plate including a first plate wall configured to extend adjacent to the first mounting surface and a second plate wall configured to extend adjacent to the second mounting surface, the mount plate defining an elongated slot through the first plate wall and defining an attachment pin projecting outwardly from said first plate wall; and - a retention band configured to at least partially wrap around a housing of the DOC system, the retention band extending between a first end and a second end, the first end comprising an attachment opening and being configured to be coupled to the mount plate by said attachment pin and the second end being configured to be coupled to the second side of the support bracket, wherein, when a fastener is inserted through the elongated slot and into the first fastener opening, the mount plate is configured to be moved laterally relative to the first mounting surface to allow the retention band to be tightened and loosened around the housing. - a support bracket include a first side and a second side opposite the first side, the first side defining a first mounting surface and a second mounting surface, the support bracket including a first fastener opening defined through the first mounting surface; and wherein said mounting assembly further comprising: - a mount plate configured to be coupled to the first side of the support bracket, the mount plate including a first plate wall configured to extend adjacent to the first mounting surface and a second plate wall configured to extend adjacent to the second mounting surface, the mount plate defining an elongated slot through the first plate wall and defining an attachment pin projecting outwardly from said first plate wall; and - a retention band configured to at least partially wrap around a housing of the DOC system, the retention band extending between a first end and a second end, the first end comprising an attachment opening and being configured to be coupled to the mount plate by said attachment pin and the second end being configured to be coupled to the second side of the support bracket, - a mount plate configured to be coupled to the first side of the support bracket, the mount plate including a first plate wall configured to extend adjacent to the first mounting surface and a second plate wall configured to extend adjacent to the second mounting surface, the mount plate defining an elongated slot through the first plate wall and defining an attachment pin projecting outwardly from said first plate wall; and - a retention band configured to at least partially wrap around a housing of the DOC system, the retention band extending between a first end and a second end, the first end comprising an attachment opening and being configured to be coupled to the mount plate by said attachment pin and the second end being configured to be coupled to the second side of the support bracket,