CAT 6V-5115 BEARING A

The CAT 6V-5115 is a Caterpillar single-row tapered roller bearing assembly, adapted for Cat 3406E/C15 engines, 777D/785 mining truck gearboxes and rear axle differentials. It is used to withstand high radial and bidirectional axial loads and is a core load-bearing component of the transmission system, ensuring efficient power transmission and stable operation. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 6V-5115, Type: Single-row tapered roller bearing assembly (including inner ring, outer ring, rollers, cage), Material: Outer/Inner Ring 52100 Chromium Bearing Steel (Quenched HRC60-64), Rollers 20CrMnTi (Carburized and Quenched HRC62-66), Cage: Phenolic Resin + Nylon, Weight: Approx. 3.2 kg, Lubrication: Grease Lubrication (Recommended: Cat Moly-Dee EP 2), Applicable Temperature: -40℃ to +120℃

Key Dimensions
Inner Diameter 85.00 mm (Tolerance 0/+0.02 mm), Outer Diameter 150.00 mm (Tolerance 0/-0.03 mm), Width 35.00 mm (Tolerance ±0.05 mm), Taper Angle 15°, Number of Rollers 18, Roller Diameter 12.5 mm 102.00 mm inner ring large end diameter, 138.00 mm outer ring small end diameter, C2×45° chamfer

Suitable Models and Applications: Compatible with the front end of the crankshaft of Cat 3406E and C15 engines, the output shaft of the gearbox of 777D and 785 mining trucks, and the planetary carrier of the rear axle differential. 2-4 pieces per machine, installed in high-speed, heavy-duty transmission parts, bearing radial loads and bidirectional axial thrust.

Performance Parameters: Basic rated dynamic load 220 kN, basic rated static load 280 kN, limiting speed 3600 rpm, rated axial load 120 kN, coefficient of friction μ≤0.005 (grease lubrication), sealing class IP65, bearing rated life 8000 hours

Structural and Performance Advantages: High-hardness bearing steel material: 52100 chromium steel, quenched, possessing high wear resistance and fatigue resistance, suitable for harsh working conditions such as mining and infrastructure, with a longer lifespan than ordinary carbon steel bearings. Over 60%.

Single-row tapered roller design: Can withstand radial and bidirectional axial loads simultaneously. The 15° cone angle matches the force characteristics of the transmission system, ensuring positioning accuracy and stability during high-speed operation.

Optimized cage structure: The phenolic resin + nylon cage is lightweight and high-strength, effectively separating the rollers, reducing friction, improving heat dissipation during high-speed bearing operation, and reducing roller wear.

Standardized assembly: Strict dimensional tolerances, compatible with original equipment manufacturer (OEM) transmission system mounting holes, requiring no additional machining. Quick replacement is possible during maintenance, meeting the efficient maintenance needs of heavy equipment.

Installation and maintenance points: Before installation, clean the bearing, journal, and bearing housing surfaces. Check for cracks in the bearing and no roller jamming. During installation, the inner ring interference should be 0.02-0.04 mm, the outer ring clearance with the bearing housing should be 0.01-0.02 mm, and the bolt torque should be 220-250 N·m. Ensure the bearing-shaft coaxiality is ≤0.03 mm. Do not strike, as this may deform the bearing or damage the rollers.

During maintenance every 1500 hours, check for: bearing clearance exceeding 0.15 mm, pitting on the outer/inner ring, or seal failure; replace immediately. Regularly replenish grease, adding 80-100 g every 800 hours to ensure adequate bearing lubrication.

Prioritize genuine bearing assemblies. Aftermarket parts may have insufficient material purity or low roller precision, easily leading to bearing burn-out, abnormal noises in the transmission system, and other malfunctions, endangering safe equipment operation.