1. Product Overview

3B-5790 bearing cup is the dedicated outer ring of tapered roller bearing for heavy Caterpillar mining dump trucks 769D, 773D and 785C. It is manufactured fully compliant with OEM drawing dimensions. This separate outer ring can be assembled with matched rollers and inner ring into a complete bearing, installed on heavy-load support positions of truck axles and final drives. During fully loaded haulage on rough mine roads, the raceway of bearing cup continuously bears high-pressure impact loads from rollers. It features high hardness and minimal deformation, acting as a universal OEM-equivalent replacement part for Caterpillar mining truck axle repair.

2. Material & Processing Advantages

This part is integrally forged from premium bearing steel, treated with complete quenching and tempering heat treatment for uniform overall hardness and qualified wear-resistant surface layer, delivering outstanding pitting and spalling resistance. The inner raceway adopts mirror super-finish grinding with low surface roughness, which reduces friction and heat generation during operation to avoid high-temperature wear. Precision machined outer diameter with tight tolerance ensures tight fit inside axle housing without excessive play or loosening. The separate cup design allows replacing only the damaged outer ring during maintenance instead of the whole bearing, effectively cutting spare parts maintenance costs.

3. Precision Grade Selection Guide

• P0: Standard general precision with high cost performance, ideal for regular mine ore & earth haulage and daily maintenance single cup replacement
• P6: Tighter dimensional and raceway tolerance improves assembly concentricity, reduces running vibration and temperature rise, perfect for fleets with frequent long-distance heavy-duty transportation
• P5: High-precision grade for complete vehicle overhaul and axle transmission performance upgrade. High-precision raceway greatly enhances the running stability of the full bearing assembly

4. Quality & Installation Instruction

3B-5790 bearing cup is strictly produced to Caterpillar OEM specifications, no secondary machining such as grinding or reaming required, it can be directly assembled with OEM matched rollers and inner rings. Every product passes full inspection on outer diameter tolerance, raceway hardness and surface finish before delivery. Custom P0/P6/P5 precision grades are available for bulk orders. Clean the axle housing bore and outer wall of bearing cup before installation, press in evenly instead of striking to prevent raceway damage. Fill sufficient lubricating grease to extend service life of the full bearing set.

5. Application Scenarios

Widely applied to axle repair of Caterpillar 769D/773D/785C mining dump trucks, export wholesale of Caterpillar construction machinery spare parts and regular maintenance of large mining haulage fleets. It solves common failures of original bearing outer rings including raceway wear, spalling, pitting, loose abnormal noise and reduced load capacity. Replacing only the bearing cup helps save spare parts purchasing costs for maintenance.