The Kobelco SK70SR Bottom Roller is a durable aftermarket undercarriage component designed to support stable track movement and reduce wear on the crawler system. Also known as a lower roller or track roller, it carries the weight of the excavator and guides the track chain along the bottom of the track frame.

Xiamen Doozer manufactures replacement bottom rollers with a focus on strength, precision, and wear resistance. The roller is produced from high-strength steel and processed with precision machining to maintain accurate dimensions and smooth running surfaces. Controlled heat treatment improves resistance to repeated loading and surface wear, making the roller suitable for demanding excavation and construction applications.

The bottom roller works together with the track chain, front idler, sprocket, and upper rollers to maintain proper undercarriage operation. When a roller becomes worn, damaged, or develops excessive play, it can increase track vibration and accelerate wear on the track chain and other undercarriage components. Replacing a worn roller with a properly matched Kobelco SK70SR bottom roller can help restore smooth track movement and improve crawler stability.

Aftermarket parts references identify YT64D00004F1 as a bottom roller for the Kobelco SK70SR and SK70SR-2, with some catalogs also listing SK70, SK70SR-1E, and SK80CS. The Kobelco SK70SR-2 service manual identifies the component as a Lower Roller (Track Roller) and specifies an approximate roller weight of 15 kg.

Xiamen Doozer supplies factory-direct aftermarket excavator undercarriage parts for distributors, contractors, repair companies, and heavy-equipment parts dealers. Buyers should confirm the machine model, serial number, and original part number before ordering because undercarriage configurations may vary.