388-9556 Return Roller for PM620

388-9556 Return Roller for PM620 This return roller is a dedicated replacement spare part designed for the PM620 asphalt cold planer/milling machine. It acts as an important supporting and guiding component for the track assembly, maintaining stable tension and smooth running of the crawler track during high-load milling operations. Adopted thickened wear-resistant steel body and precision bearing assembly, it features strong load-bearing capacity, good shock resistance and