Doosan DX140LC Series Top Roller / Carrier Roller K1011870A – Premium Undercarriage Component

Description

The Doosan Top Roller, part number K1011870A, also widely known as an upper roller or carrier roller, is an essential component of your excavator’s undercarriage system. Strategically positioned on the upper side of the track frame, its primary function is to support the weight of the track chain, preventing excessive sag between the idler and sprocket. This ensures the track maintains proper tension and alignment, allowing it to glide smoothly and efficiently, thereby reducing friction and wear on other costly undercarriage parts such as track links and idlers. This top roller is specifically compatible with various models in the Doosan DX140LC series, including DX140LC, DX140LC-3, DX140LCR, DX140LCR-3, DX140LC-5, and DX140-5.

Important Compatibility Note for DX170LC-7: While the DX170LC-7 shares similarities with the DX140LC series, manufacturers may use different or updated part numbers for undercarriage components on different machine models or generations. Therefore, for your Doosan DX170LC-7 excavator, it is highly recommended to cross-reference this part number (K1011870A) with your machine’s official parts manual or consult with a certified Doosan parts specialist to ensure exact compatibility and correct fitment.

Manufactured to stringent OEM standards, this top roller is typically constructed from high-strength, heat-treated alloy steel to ensure maximum durability and exceptional resistance to wear and impact. Its robust design, weighing approximately 13 kg, is built to withstand the continuous stress of supporting the track and the impacts from uneven terrain. The roller features sealed shaft and bearings, which are pre-lubricated (often oil-filled) and protected by heavy-duty seals. This “sealed for life” design prevents the ingress of abrasive contaminants like dirt, mud, and water, which are common in excavation environments. This critical sealing mechanism ensures smooth, low-friction rotation and significantly extends the component’s operational lifespan by keeping internal parts clean and well-lubricated, reducing the need for frequent maintenance.

A worn or failing top roller can lead to several operational issues, including excessive track slack, increased vibration, accelerated wear on track links, and potential de-tracking. These issues compromise machine stability, reduce operational efficiency, and can result in significant repair costs and unplanned downtime. Replacing a faulty top roller with a high-quality, OEM-standard part like the K1011870A is vital for maintaining the integrity of your undercarriage system, ensuring consistent machine performance, and protecting your investment. This carrier roller is an indispensable replacement for routine maintenance or when addressing specific issues related to track support and guidance for compatible machines.

Key Features:

• OEM-Quality Part: Guarantees a precise fit and reliable performance, meeting or exceeding original factory specifications for Doosan DX140LC series excavators.
• High-Strength Steel Construction: Fabricated from premium heat-treated alloy steel for maximum durability and robust resistance to wear and impact.
• Sealed & Lubricated Design: Features sealed shaft and heavy-duty bearings that are pre-lubricated for life, ensuring maintenance-free operation and superior protection against contaminants.
• Optimal Track Support: Engineered to effectively support the track chain, reducing sag and maintaining proper tension and alignment.
• Enhanced Longevity: Durable construction and advanced sealing contribute to an extended service life, even in harsh operating conditions.
• Consistent Weight: Weighs approximately 13 kg, reflecting a solid and appropriately sized component for its intended application.

Benefits:

• Ensures Smooth Track Movement: Facilitates continuous, low-friction operation of the track chain, improving overall machine efficiency.
• Reduces Component Wear: By maintaining proper track alignment and tension, it significantly minimizes wear on track links, sprockets, and idlers.
• Improves Machine Stability: Contributes to stable and controlled operation, reducing vibrations and enhancing operator comfort.
• Minimizes Downtime & Costs: High-quality construction and a sealed design reduce the likelihood of unexpected failures, helping to prevent extensive repairs and maximize operational uptime for compatible machines.
• Resistant to Contamination: Advanced sealing technology protects internal components from dirt, moisture, and debris, ensuring consistent performance.