1. Product Overview

5M9644 cylindrical roller bearing is specially matched for Caterpillar D3B, D6C, D6E, D7G2 series bulldozers, manufactured fully compliant with Caterpillar OEM drawing dimensions. The complete set adopts three-piece split separable structure including inner ring, roller cage and outer ring. It is installed on heavy-load support positions of bulldozer travel final drives and drive axles. It stably buffers high-strength alternating radial impact loads during heavy earthmoving, climbing and long-distance soil transportation of bulldozers. The split separable structure avoids disassembling the complete transmission box, allowing separate replacement of worn damaged inner ring, outer ring or roller assemblies during maintenance, which greatly reduces bulldozer maintenance downtime and operation losses of mines and construction sites.

2. Material & Processing Advantages

1. Bearing Base Material: Integrally forged from premium high-carbon chromium bearing steel with complete quenching and tempering heat treatment. Uniform hardness and stable metallurgical structure of rollers and raceways deliver excellent resistance to fatigue, pitting and surface spalling, capable of enduring continuous heavy impact loads of bulldozers.
2. Cylindrical Roller Load Structure: Line contact between cylindrical rollers and raceways provides much larger effective contact area than ball bearings, with extremely strong radial load capacity to perfectly adapt to full-load heavy bulldozing conditions.
3. Separable Split Structure: The inner ring and outer ring are fully detachable. During equipment maintenance, only the damaged single component needs to be replaced instead of the whole bearing set, significantly cutting spare parts purchasing costs for construction machinery maintenance.
4. Super-Finished Raceway Process: Mirror precision grinding on inner and outer raceways achieves ultra-low surface roughness, reducing running friction and operating temperature. It avoids high-temperature seizure and abnormal wear failures during long-term continuous bulldozing operation.

3. Precision Grade Selection Guide

• P0: Standard general precision with high cost performance, suitable for regular earthmoving bulldozing and routine maintenance replacement of bulldozers on construction sites
• P6: Tighter dimensional tolerance for raceway and outer diameter reduces running vibration and heat generation, ideal for engineering fleets with 24-hour non-stop heavy continuous bulldozing construction in mines
• P5: High-precision grade for complete bulldozer overhaul and travel final drive performance upgrade, with greatly improved running concentricity and stability

4. Quality & Installation Instruction

5M9644 cylindrical roller bearing is strictly manufactured to Caterpillar OEM specifications, complete with separable three-piece matching components. No extra accessories are required for direct installation on bulldozer final drive positions. Every finished product passes full inspection on bearing hardness, internal clearance, raceway finish and dimensional tolerance before delivery. Custom P0/P6/P5 precision grades are available for bulk orders. Installation steps: 1. Thoroughly clean final drive housing and drive shaft journal to remove silt, grease and impurities; 2. Press fit inner ring onto drive shaft first, then assemble roller cage; 3. Align and install outer ring, fasten positioning retaining ring evenly; 4. Fill matched high-temperature construction machinery lubricating grease and finish assembly & commissioning.

5. Application Scenarios

Widely applied to final drive and drive axle repair of Caterpillar D3B/D6C/D6E/D7G2 bulldozers, export wholesale of Caterpillar construction machinery spare parts, and regular equipment maintenance of large mines and infrastructure engineering fleets. It solves common failures of original bearings such as abnormal running noise, roller pitting wear, raceway surface spalling, excessive transmission clearance, reduced load capacity and high-temperature seizure. The separable split structure allows replacement of only damaged parts, effectively saving purchasing costs for complete bulldozer overhaul.