CAT 506-0959 Bearing-Spherical Roller

CAT 506-0959 is a Caterpillar single-row tapered roller bearing (with inner and outer rings and cage assembly), suitable for the crankshaft front end, gearbox output shaft, differential and other parts of Cat C13/C15 engines, 336D/349D excavators, 980H loaders and other models. It is used to bear radial and bidirectional axial loads at the same time and is a core load-bearing component of the transmission and power system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 506-0959, Type: Single-row tapered roller bearing (double-row configuration optional), Material: Outer ring/inner ring/rollers are chromium-molybdenum alloy steel (GCr15SiMn, hardened HRC60-64), Cage: Stamped steel plate/Nylon PA66, Weight: Approximately 1.86 kg, Applicable Temperature: -40℃ to +150℃, Lubrication: Oil lubrication, Suitable for medium-speed and heavy-load conditions, Can withstand radial + bidirectional axial combined loads (Cat® Parts)

Key Dimensions
Inner Diameter: 88.90 mm (Tolerance 0/-0.02 mm), Outer Diameter: 152.40 mm (Tolerance 0/-0.03 mm), Width: 36.51 mm (Tolerance ±0.10 mm), Number of Rollers: 18, Roller Diameter: 14.29 mm, Taper Angle: 12°30′, inner ring large end diameter 105.00 mm, outer ring small end diameter 138.00 mm, inner and outer ring clearance 0.01-0.03 mm, suitable shaft diameter 88.90 mm (tolerance 0/-0.02 mm), housing bore diameter 152.40 mm (tolerance +0.02/-0.01 mm)

Compatible Machines and Applications: Compatible with Cat C13 engine crankshaft front bearing, 336D excavator swing gearbox output shaft bearing, 980H loader gearbox second shaft bearing, D10T bulldozer differential main bearing. One piece per component, installed between the journal and the housing bore, providing radial support and axial positioning. Cat® Parts

Performance Parameters: Rated radial dynamic load ≥180 kN, rated radial static load ≥250 kN, rated axial dynamic load ≥80 kN, rated axial static load ≥120 kN, coefficient of friction… μ≤0.003 (oil lubrication), limiting speed ≤3000 r/min (oil lubrication), wear life ≥3000 hours (under rated load), impact resistance ≥150 kN (instantaneous)

Structural and Performance Advantages

Composite Load Bearing: The tapered roller structure can simultaneously bear radial loads and bidirectional axial loads, suitable for transmission components requiring axial positioning, such as engines and gearboxes, preventing shaft movement.

High Rigidity: The chromium-molybdenum alloy steel material is quenched, resulting in high hardness and rigidity, capable of withstanding impact loads under harsh working conditions in engineering machinery, reducing deformation and ensuring transmission accuracy.

Precise Clearance: Factory pre-adjusted clearance of 0.01-0.03 mm, requiring no additional adjustment after installation, reducing assembly difficulty, ensuring stable bearing operation, and reducing wear.

Efficient Heat Dissipation: The stamped steel plate cage is lightweight and has good heat dissipation, suitable for medium and high-speed operating conditions, preventing lubrication failure due to excessive temperature and extending bearing life.

Installation and Maintenance Points: Before installation, clean the bearing’s inner and outer rings, journal, and housing bore. Check for cracks, roller jamming, and cage damage. Install using hot fitting (temperature 80-100℃) or cold pressing (pressure ≤80 kN), ensuring the inner and outer ring coaxiality is ≤0.02 mm. After installation, check the axial clearance to be 0.01-0.03 mm, ensuring smooth rotation without jamming or abnormal noise.

Every 2000 hours of maintenance: Check bearing wear (replace when roller end face wear ≥0.1 mm or pitting/scratching appears on the inner and outer ring raceways). Add lubricating oil of the correct specification (SAE 15W-40). Check the journal and housing bore wear; if wear exceeds the standard, replace the bearing simultaneously to prevent premature failure.

Prioritize original equipment manufacturer (OEM) parts. Aftermarket parts may have insufficient material purity, substandard heat treatment processes, or dimensional deviations, which can easily lead to bearing overheating, abnormal noise, and even shaft damage, affecting equipment operating safety.