380-7675 bearing 251-9905 bearing CAT bulldozer parts

380-7675 bearing 251-9905 bearing CAT bulldozer parts

The 380-7675 and 251-9905 bearings are core load-bearing components of the Caterpillar bulldozer’s traveling, transmission, and rotating mechanisms. Strictly adhering to Caterpillar’s original equipment manufacturer (OEM) manufacturing standards and tolerances, they are specifically designed for the harsh operating conditions of Caterpillar bulldozers, characterized by heavy loads, high impacts, strong vibrations, and high dust levels. Working together, they provide stable support, precise guidance, and efficient wear reduction for critical rotating parts, effectively reducing operating friction, minimizing component wear, and preventing abnormal noises, misalignment, and downtime caused by bearing looseness, jamming, or burning. They are the preferred OEM-grade parts for the maintenance, repair, and overhaul of Caterpillar bulldozer chassis and transmission systems, and are widely applicable to various demanding operating scenarios such as mining, infrastructure construction, earthmoving, and material handling.

As a core support component for the bulldozer’s heavy-duty rotating parts, the 380-7675 bearing primarily bears combined radial and axial loads, ensuring the smooth operation of components such as the drive shaft and hub. The bearing is made of high-purity bearing steel, precision forged, heat-treated, and ultra-precision machined, resulting in uniform hardness, stable metallographic structure, and excellent compressive strength and fatigue resistance. The raceway and rolling elements meet original equipment manufacturer (OEM) standards, ensuring smooth operation and low resistance, effectively reducing power loss. An internal reinforced lubrication structure provides excellent sealing performance, effectively preventing dust, mud, and moisture intrusion. It maintains its accuracy even under continuous heavy loads and strong vibrations. The installation dimensions are identical to the original, allowing for direct replacement without adjustment.

The 251-9905 bearing, a key auxiliary support bearing for bulldozers, is used in conjunction with the 380-7675 bearing. Its primary functions are load balancing, improved operational stability, and extended system life. The bearing features a reinforced cage design, making it resistant to deformation and noise under high speeds and heavy loads. The raceway surface undergoes precision grinding, resulting in low roughness and significantly reducing wear and heat generation. It possesses excellent impact resistance, vibration resistance, and temperature resistance, allowing it to withstand long-term continuous operation. Manufactured strictly according to Caterpillar original dimensions and clearance values, it precisely matches the assembly cavity and shaft diameter, forming a highly efficient support combination with the 380-7675 bearing, improving the reliability and service life of the overall rotation system.

Both parts are Caterpillar original QAP quality certified, having undergone rigorous performance tests including wear resistance, vibration resistance, fatigue resistance, impact resistance, and corrosion resistance. Their quality is identical to original parts, allowing them to directly replace original components without modification or secondary processing, effectively reducing equipment downtime for maintenance. Whether for routine maintenance, chassis overhaul, or complete machine repair, the 380-7675 and 251-9905 bearings perfectly match the swivel support system requirements of Caterpillar bulldozers, reducing long-term operation and maintenance costs and ensuring continuous and stable operation of the bulldozer in various heavy-duty tasks. They are suitable for all Caterpillar bulldozer models.

Core Technical Parameters

Compatible Models: Caterpillar bulldozers of all series

380-7675 Bearing: High-carbon chromium bearing steel, precision raceway, heavy-duty design, original factory clearance, reinforced sealing structure

251-9905 Bearing: High-precision rolling elements, wear-resistant cage, composite load-bearing capacity, impact and vibration resistant, original factory size standard

Quality Standards: Meets Caterpillar original factory quality specifications, passes vibration resistance 12g@10~1500HZ cycle test and life durability test

Core Advantages

Original factory precise fit, direct replacement without modification; high rigidity heavy-duty load bearing, smooth operation and low noise; wear-resistant and fatigue-resistant, longer service life; excellent sealing to prevent dirt and dust, stable under harsh working conditions; convenient and high-precision installation, reducing maintenance frequency; effectively reduces friction loss and improves equipment power and reliability.

Get a personalized quote now

491-6476 Tube As-Exhaust
491-6477 Tube As-Exhaust
9N-1941 CLAMP-V-BAND
9N-9545 ELBOW-REDUCING
457-9164 CLAMP-T-BOLT
486-5078 Hose-Formed
602-3867 Hose-Formed
569-3870 Engine Ar – Complete
372-9125 Core As – Fuel Cooler
565-9127Tube
587-1654 CLAMP-T-BOLT
616-7866 Hose
258-0817 Hose
572-3715 Hose-Formed
493-2532 Hose-Hump
7X-7958 CLAMP-BAND
8T-4985 CLAMP – BAND
9X2201 CLAMP-BAND
9L-4244 ELBOW-REDUCING
457-9162 CLAMP-T-BOLT
376-1525 Hose
457-9163 CLAMP-T-BOLT
569-3869 Engine Ar – Complete
584-3386 Radiator Gp
579-0250 Hose-Formed
588-9233 Tube – Radiator
482-5751 CLIP-PLASTIC
372-6615 Seal – Bottom
563-5456 Hose-Molded
577-3598 Core As – Radiator
486-5077 Hose-Molded
542-2549 Hose-Molded
9X-2201 Clamp-Hose

*For other spare parts procurement needs, please contact us!