This metal-rubber shock absorber dampens vibration in the cleaning-unit drive train of a grain harvester. It is installed between the drive linkage and the cleaning-shoe assembly, where it absorbs cyclic loads from the oscillating sieves and chaffer. A worn or collapsed absorber transmits excess vibration to the sieve frame, causing uneven material distribution across the cleaning surface and reducing separation efficiency. This original component matches the factory-installed damping rate, which the cleaning-system timing relies on for consistent fan-and-sieve coordination.