Description
CAT 2S-5271 BEARING
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The CAT 2S-5271 is a single-row cylindrical roller bearing used by Caterpillar for drivetrain systems. It is suitable for gearboxes, transfer cases, and other components in equipment such as loaders and excavators. It can withstand large radial loads and is suitable for medium- to high-speed rotational conditions. The following is structured technical and application information.
Core Technical Parameters
Item Details
Basic Attributes Model 2S-5271, Type Single-row cylindrical roller bearing (inner ring with flange), Material High-carbon chromium bearing steel (52100), Single weight approximately 0.9 kg, Suitable temperature -30℃ to +150℃, Suitable working conditions are medium-high speed, heavy-duty radial force, no axial load capacity
Key Dimensions Inner diameter 80 mm, outer diameter 140 mm, width 32 mm, chamfer radius R2 mm, inner hole surface roughness Ra≤0.8 μm, inner diameter tolerance H7, outer diameter tolerance h6, cylindricity ≤0.01 mm, straightness ≤0.008 mm, parallelism of both end faces ≤0.015 mm
Suitable Machines and Parts Suitable for Cat 966M/972M loader gearbox second shaft, 336GC excavator boom reduction gearbox input shaft, 140M grader transfer case output shaft, 1-2 per machine Suitable for radial loads ≤220 kN and speeds ≤3000 rpm.
Performance Parameters: Dynamic rated load Cr≥135 kN, static rated load Cor≥160 kN, coefficient of friction ≤0.0015 (oil lubrication), hardness HRC 60-64, recommended Cat 15W-40 gear oil lubrication, oil bath lubrication, non-contact labyrinth seal.
Structural and Performance Advantages:
Inner ring with flange structure: restricts roller axial displacement, suitable for medium- and high-speed rotation, ensuring smooth operation, effectively reducing vibration and noise, and improving transmission system efficiency.
High-carbon chromium bearing steel material: quenched and tempered, possessing high hardness, high wear resistance, and good toughness, suitable for harsh working conditions in engineering machinery, extending bearing service life.
High-precision manufacturing: strict dimensional tolerance and surface roughness control ensure good fit with the shaft and housing after installation, reducing friction loss and improving equipment operational stability.
Highly adaptable: Standardized design, compatible with various Caterpillar construction machinery, easy installation, no complex adjustments required, reducing maintenance time and costs.
Installation and Maintenance Points: Before installation, clean the shaft diameter and mounting holes, removing burrs and oil stains. Inspect the inner and outer surfaces of the bearing for scratches and deformation. During installation, use a dedicated pressing tool to apply even pressure to press the bearing into the mounting hole. Pressure ≤60 kN to avoid localized stress that could cause deformation. After installation, ensure the radial clearance is between 0.08-0.12 mm.
Lubrication Specifications: After installation, ensure the bearing is completely immersed in gear oil. The oil level must be higher than the lowest rolling element. Check the oil level and quality every 1000 hours, replacing the gear oil if necessary. Do not mix different types of lubricating oil.
Maintenance Cycle: Check bearing wear every 2500 hours. If the inner bore wear exceeds 0.15 mm, or if surface peeling, cracks, or other defects appear, replace immediately. Avoid subjecting the bearing to axial loads and severe impacts to prevent damage to the rollers and raceways.
