What Track Rollers Are Available for Excavator Undercarriages?

Track rollers, also known as bottom rollers or carrier rollers, are critical components in excavator undercarriages designed to bear machine weight and maintain track alignment. AFTparts offers compatible rollers for major brands including CAT, Kubota, and Kobelco, with specialized models like RD41121703 (Kubota) and CR5572 (CAT). These components feature hardened steel construction (355-440 HB hardness) and come in single/double flange configurations for varied soil conditions.

What types of track rollers exist for excavators?

Track rollers are categorized into single-flange (unilateral) and double-flange (bilateral) designs. Single-flange models reduce mud accumulation in wet conditions, while double-flange variants provide enhanced track guidance for rocky terrain. AFTparts’ rollers include OEM-equivalent options like SI888 (Kobelco) and V051125100 (Kubota), engineered for precise fitment and load distribution up to 100 tons.

Single-flange rollers feature one raised edge to prevent lateral track slippage, ideal for swampy environments where debris clearance is critical. Double-flange designs use two guide ribs for maximum stability in mining or construction applications. Both types utilize sealed roller bearings and hardened 50Mnb alloy steel for abrasion resistance. Pro Tip: Always match flange count to your excavator’s original specifications—mismatched designs accelerate track link wear. For example, AFTparts’ RD80921703 Kubota roller uses dual flanges to handle the torsional stresses of compact excavators working on slopes.

How do materials affect track roller performance?

Track roller durability directly correlates with material selection. AFTparts uses induction-hardened 50Mnb steel achieving 355-440 HB surface hardness, providing 2-3X longer service life than standard carbon steel. Heat-treated components resist pitting and spalling even under 12+ hour daily operation in abrasive conditions.

The manufacturing process involves carburizing and quenching to create a wear-resistant surface layer while maintaining a tough core. Sealed labyrinthine grease channels prevent contaminant ingress—a common failure point in sand-intensive environments. Pro Tip: Opt for rollers with triple-lip seals if operating in slurry or wet clay. AFTparts’ Kobelco YT64D00004F1 model demonstrates this technology, surviving 8,000+ hours in Brazilian iron ore mines before requiring maintenance.

Which brands/models does AFTparts support?

AFTparts provides direct-fit track rollers for over 90% of CAT, Komatsu, and Kubota excavators. Specific compatible models include SY215 (Sany), DX340 (Doosan), and LG6210 (Lonking). Each roller undergoes 17-step quality checks to ensure dimensional accuracy within 0.02mm tolerance.

For CAT 320D series, the CR5572 roller replicates OEM weight distribution (18.7kg) and bore diameter (70mm±0.5). Kubota KX040-4 mini-excavators use RD14821700 rollers with optimized flange spacing to prevent track derailment during tight turns. Pro Tip: Cross-reference your machine’s serial number with AFTparts’ compatibility database—variants exist even within the same model family due to regional manufacturing differences.

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