Doosan DH300 Excavator Top Roller 30-Ton Lug-Pattern Carrier

The DH300 Top Roller is a precision-engineered component designed for 30-Ton Doosan DH300-series excavators. This lug-pattern carrier roller ensures durability, excellent load-bearing capacity, and smooth operation in demanding construction environments.

The DH300 top roller is a critical wear part in the undercarriage system of DH300-series excavators (including Daewoo DH300, DH300LC-7 models). Its primary function is to support the upper run of the rubber track, reducing friction between the track and excavator frame while ensuring smooth, consistent movement during operation. As a load-bearing component, it withstands repeated vertical and horizontal forces from the track, making durability and precision essential to prevent track slippage, uneven wear, and costly downtime.

• 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