Title:
3.8T-6T Lower Track Roller (W21CS41257)
Description:
Maintain strong undercarriage performance and smooth machine travel with the genuine Kubota 3.8T–6T Lower Track Roller (W21CS41257). Specifically designed for Kubota mid-size excavators, this OEM lower track roller supports and guides the track chain while also distributing machine weight evenly across the undercarriage system. Because excavators in the 3.8T to 6T class regularly operate under heavy digging, grading, and construction workloads, maintaining reliable track rollers is essential for reducing wear, improving stability, and preventing costly downtime.
Manufactured to Kubota’s exact factory specifications, this genuine lower track roller delivers precise fitment, heavy-duty durability, and consistent performance in demanding job site conditions. Furthermore, its robust construction is engineered to withstand continuous exposure to dirt, mud, debris, vibration, and heavy loads. As a result, operators can help maintain smoother track alignment while also reducing stress on surrounding undercarriage components and extending overall system life.
In addition, this genuine Kubota lower track roller helps improve travel stability and supports consistent track engagement during excavation and earthmoving operations. Consequently, maintaining a properly functioning undercarriage system can help extend the lifespan of tracks and related components while also improving machine efficiency and productivity. Moreover, genuine Kubota OEM parts ensure dependable compatibility and factory-level reliability, helping simplify installation and ensure long-lasting performance.
Every Kubota OEM lower track roller is manufactured for durability and consistent performance in tough construction environments. Whether you are replacing a worn roller or carrying out preventative maintenance, this genuine Kubota replacement component helps restore smooth track operation, improve excavator reliability, and support long-term machine productivity.
Model Fitment:
Kubota Mid-Size Excavators
- U45-3
- U45-3 A
- U50-3 A
- KX161-3
- KX161-3 A
- U48-4
- U55-4
- KX057-4
- U50-5
- U56-5
- KX060-5
- KX121-3
- KX121-3 A
- KX042-4
Part Details:
- Part Name: Lower Track Roller
- Kubota Part Number: W21CS41257
- Alternate Part Number: W21CS-41257
- Part Type: Excavator Lower Track / Bottom Roller
- Brand: Kubota Genuine Parts
- Application: Excavator undercarriage and track support system
- Designed For: 3.8T–6T Kubota excavators
- Function: Supports and guides the lower track chain during operation
- Material: Heavy-duty hardened steel construction
- OEM Quality: Genuine Kubota exact-fit replacement component
- Installation: Direct replacement undercarriage part
