Product Overview

The CAT D6 Track Roller-2 (also known as double flange bottom roller, lower roller, or support roller) is a critical undercarriage component designed specifically for Caterpillar D6 series medium bulldozers and compatible track loaders. As the primary load-bearing element of the undercarriage system, this double flange track roller supports the entire operating weight of the machine while guiding the track chain, preventing lateral movement, and ensuring smooth, stable movement across all types of terrain .

Compatible Equipment Models

• Dozers: CAT D6C, D6D, D6E, D6G, D6H, D6M, D6N, D6R, D6R II, D6R III, D6T, D6K, D6K2, D6 XE (including XL, LGP, and XW configurations)
• Track Loaders: CAT 963, 963B, 963C, 963D
• Other Equipment: CAT 229, 231 hydraulic excavators

Key Specifications

• Primary OEM Part Numbers: 120-5766 (1205766), 7T4107, 125-4176, 288-0935
• Berco Reference Number: CR6089
• Type: Double flange bottom track roller
• Weight: Approximately 45-55 kg (99-121 lbs)
• Quantity per machine: 7-9 rollers per side (14-18 total) depending on D6 model configuration
• Outside Diameter: 210 mm (8.27 inches)
• Flange Diameter: 240 mm (9.45 inches)
• Color: Caterpillar yellow (standard OEM finish) or black
• Condition: New
• Warranty: Typically 1 year or 2000 operating hours for genuine CAT parts

Material & Manufacturing Process

The CAT D6 Track Roller-2 is manufactured using Caterpillar's proprietary processes and premium materials to ensure exceptional durability in the most demanding working conditions:

• Roller Body: Forged from high-quality 50Mn or 40MnB alloy steel, which provides an optimal balance of surface hardness and core ductility . The body undergoes normalization followed by medium-frequency induction surface hardening, resulting in a surface hardness of HRC 52-58 with a hardening depth of 8-12 mm .
• Shaft: Made from high-tensile alloy steel, heat-treated to achieve a surface hardness of HRC 52-60 with a hardening depth of 3-6 mm. The shaft surface is precision-polished to minimize friction and wear on internal bearings .
• Bearings: Equipped with high-performance bi-metallic bushings or tapered roller bearings that provide excellent load-bearing capacity and wear resistance .
• Duo-Cone Seals: Caterpillar's patented dual-cone sealing system consists of two precision-finished chromium-molybdenum alloy rings with a micro-scale finish that traps a thin film of grease between them, creating an exceptionally effective barrier against contaminants .
• O-Rings: Manufactured from high-grade nitrile butadiene rubber (NBR), offering excellent oil resistance and high-temperature resistance .
• Surface Treatment: The assembly is shot-blasted and painted with Caterpillar's standard yellow paint system for superior corrosion protection .

Performance Features & Advantages

1. Exceptional Load-Bearing Capacity

Engineered to support the full operating weight of CAT D6 series bulldozers (17,000–24,000 kg) while withstanding the extreme dynamic shock loads encountered during dozing, grading, and pushing operations Cat.

2. Superior Wear Resistance

The deep induction hardening process creates a tough, wear-resistant outer layer while maintaining a ductile core that absorbs impacts. This design prevents premature wear, cracking, and deformation, even in highly abrasive working conditions such as sand, gravel, and rock .

3. Advanced Duo-Cone Sealing System

Caterpillar's industry-leading dual-cone seal design effectively prevents lubricant leakage and blocks the ingress of dirt, sand, water, and other contaminants. This extends the service life of internal bearings and reduces maintenance requirements .

4. Lifetime Lubrication

All CAT D6 Track Roller-2 assemblies are sealed and pre-lubricated at the factory for the entire service life of the roller, requiring no routine maintenance greasing .

5. Optimized Track Alignment

The double-flange design provides maximum track guidance, preventing lateral slippage and derailment. This ensures stable machine operation, especially during turning maneuvers and on uneven terrain .

6. Perfect OEM Fit

Manufactured to Caterpillar's exact specifications, the D6 Track Roller-2 provides a direct replacement for the original part, ensuring hassle-free installation and compatibility with all other undercarriage components .

7. Compatibility with CAT Undercarriage Systems

Designed to work seamlessly with Caterpillar's Heavy Duty Extended Life (HDXL) with DuraLink™ and Cat Abrasion™ undercarriage systems, providing optimal performance and extended service life Cat.

Applications

The CAT D6 Track Roller-2 is suitable for a wide range of construction and earthmoving applications, including:

• General construction sites
• Road building and maintenance
• Land clearing and site preparation
• Mining and quarry operations
• Demolition work
• Forestry applications
• Agricultural land development
• Snow removal

Maintenance Tips

• Regular Inspection: Inspect track rollers every 250 operating hours for signs of wear, damage, or oil leakage .
• Rotation Check: Periodically check that all track rollers rotate freely without binding or excessive noise.
• Cleaning: Clean undercarriage components after working in muddy or sandy conditions to remove abrasive materials that can accelerate wear .
• Track Tension: Maintain proper track tension according to Caterpillar's recommended specifications to reduce excessive stress on rollers .
• Replacement Criteria: Replace track rollers if they show signs of excessive wear, cracking, deformation, or oil leakage. Worn track rollers can cause accelerated wear on other undercarriage components .
• Complete Replacement: When replacing track rollers, it is recommended to replace all rollers on the same side simultaneously to ensure even wear and optimal performance .
• Genuine Parts: Always use genuine Caterpillar track rollers to ensure optimal performance, durability, and compatibility with your machine .

Conclusion

The CAT D6 Track Roller-2 is a high-quality, reliable undercarriage component that delivers exceptional performance and durability in demanding working environments. By effectively supporting the machine weight and maintaining proper track alignment, this double flange track roller helps extend the service life of your bulldozer's undercarriage system while ensuring smooth, efficient operation. Choosing genuine Caterpillar OEM parts ensures that your D6 series bulldozer operates at peak efficiency with minimal downtime and maximum productivity.TMKR