CAT 132-8870 31.8mm Inner Diameter Ball Bearing

CAT 132-8870 is a Caterpillar genuine single-row tapered roller bearing, suitable for drive axles, gearboxes, or final drive systems of loaders, excavators, and other equipment, used to withstand combined radial and unidirectional axial loads. The following is pure raw data and does not include replacement parts information for Cat.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 132-8870, Type: Single-row tapered roller bearing (inner and outer rings + roller assembly), Material: High carbon chromium bearing steel (GCr15), Weight: 1.86 kg, Suitable for maximum radial load 85 kN, maximum axial load 32 kN, Limiting speed: 3200 rpm, Operating temperature: -40℃ to +120℃, Suitable for general-purpose lithium-based grease/gear oil, Used in drive axle differentials, gearbox output shafts, final drives, etc., providing high rigidity and stable load transmission (Cat)

Key Dimensions (Metric/Imperial)
Inner diameter: 65.0 mm (2.559 in, tolerance 0/-0.015 mm), Outer diameter: 120.0 mm (4.724 in, tolerance ±0.12 mm), Width: 29.0 mm (1.142 in, tolerance ±0.1 mm), Number of rollers: 18 Each roller has a diameter of 14.5 mm, a length of 22.0 mm, an outer raceway angle of 12°, an inner raceway angle of 15°, a taper of 1:12, a shaft fit tolerance of k6, and a bearing housing fit tolerance of H7Cat®…

Performance Parameters: Inner and outer rings are surface hardened, with a hardness of HRC 60-64, tensile strength ≥1800 MPa, contact fatigue life ≥8000 hours, rotational accuracy P6 grade, radial clearance 0.012-0.025 mm, grease filling 120±10 g, and an open seal (compatible with labyrinth/contact seals). It can withstand moderate impact loads (Cat).

Structure and Compatibility Characteristics:

Combined Load Compatibility: The tapered roller structure can simultaneously withstand radial and unidirectional axial loads, making it suitable for drive axles, gearboxes, and other transmission components with bidirectional forces. The taper design ensures uniform load distribution, reduces contact stress, and minimizes the risk of pitting corrosion.

Ease of Installation: The inner and outer rings are separable, facilitating individual installation and disassembly. Suitable for assembly scenarios with limited space, after installation, adjusting the axial preload optimizes bearing rigidity and operational accuracy, suppressing vibration and noise.

Operating Condition Compatibility: Made of high-carbon chromium bearing steel with quenching treatment, suitable for high-frequency vibration and impact conditions in engineering machinery. Resistant to gear oil and grease corrosion, with no significant wear or roller detachment risk over long-term use. Compatible with mainstream Cat models such as Cat 950GC and 320GX.

Installation and Maintenance Points (Original Data)

Installation: Clean the bearing and mounting surfaces (free of oil and metal shavings). Hot-fit (≤100℃) or cold-press into the journal for the inner ring. Press the outer ring into the bearing housing. Adjust the axial preload according to the equipment manual (recommended preload torque 12-15 N·m) to ensure smooth and unobstructed bearing rotation, with a coaxiality ≤0.05 mm.

Maintenance: Check the bearing operating temperature (≤80℃) and noise every 2000 hours, and replenish grease or change gear oil; replace immediately if roller pitting, raceway wear, or cage deformation are found; apply anti-rust oil and seal for long-term storage to prevent bearing corrosion.