D85 Excavator Top Roller for 8.5-Ton Machines ISO CE Certified

The ​​D85 top roller​​ is a key wear part in the undercarriage of Komatsu D85 bulldozers, designed to support the track between the sprocket and idler. It plays a vital role in guiding track movement, absorbing shock from rough terrain, and preventing premature wear on other undercarriage components (e.g., tracks, sprockets). Regular inspection and maintenance of the top roller are essential to ensure the bulldozer’s stability, reduce downtime, and extend the life of the entire undercarriage system.

Our production involves rigorous quality-controlled processes:

• High-grade Material Selection: Components are crafted from premium materials for maximum durability
• Outer Race/Shell: High-carbon chromium bearing steel (SUJ2) for superior hardness and wear resistance
• Inner Roller/Spindle: Alloy steel (SCM440) engineered to withstand significant radial and axial loads
• Seals & Lubrication: Nitrile rubber (NBR) seals for oil resistance with lithium-based grease for long-term lubrication
• Quality Assurance: All materials undergo thorough inspection for chemical composition and mechanical properties using spectrometers and hardness testers