CAT 097-5287 BEARING

CAT 097-5287 is a single-row tapered roller bearing (journal bearing) for Caterpillar engineering machinery. It is commonly used in the drive axle, gearbox output shaft, or reduction gear mechanism of mini excavators/loaders. Its core function is to withstand combined radial and unidirectional axial loads, suitable for low-to-medium speed, heavy-load conditions, ensuring the rotational accuracy and load transmission stability of the transmission/actuator. The following is precise technical and application information:

Core Technical Parameters
Item Details
Part Model: CAT 097-5287 (0975287) Single-row tapered roller bearing, suitable for journal support positions, general-purpose transmission bearing

Core Material: Inner/Outer Ring + Rollers: GCr15SiMn bearing steel (AISI 52100), Cage: Stamped steel plate (SPCC), surface treated with ultra-precision grinding and rust prevention, hardness HRC 60–64, contact fatigue life ≥10⁶ cycles

Key Dimensions (Imperial/Metric): Inner Diameter 31.75 mm (1.25 in), outer diameter 69.85 mm (2.75 in), width 21.43 mm (0.844 in), taper angle 10°±1°, number of rollers 12, single weight approx. 0.28 kg (0.62 lb), tolerances: inner diameter ±0.015 mm, outer diameter ±0.02 mm, width ±0.1 mm

Rated Load: Basic rated dynamic load 48 kN, basic rated static load 52 kN, maximum radial load 42 kN, maximum axial load 18 kN

Suitable Operating Conditions: Applicable speed ≤4500 r/min (grease lubrication), operating temperature -30℃ to +120℃, compatible with NLGI Grade 2 lithium-based grease, suitable for low-to-medium speed, heavy-duty, axially loaded transmission/support scenarios

Compatible Models: CAT 303.5E2/304E2 Excavator (slewing gearbox input shaft), 903C loader (gearbox output shaft), 416F2 loader (front axle differential side shaft)

Supporting Parts: Bearing housing 148-8002 (retainer), sealing ring 374-6512 (seal retainer), grease nipple 1J-5322

Core Functions and Structural Features:

Combined Load Bearing: The tapered roller structure can simultaneously withstand radial and unidirectional axial loads, suitable for drive axles, gearboxes, and other parts with axial movement risks, preventing shaft displacement.

High-Precision Positioning: Strict cone angle and dimensional tolerances, combined with bearing housing fixation, ensure shaft rotation accuracy, radial runout ≤0.02 mm, reducing transmission shock and noise.

Efficient Heat Dissipation: Lightweight design of stamped steel plate cage facilitates grease flow and heat dissipation, suitable for the thermal balance requirements of low-to-medium speed heavy-load conditions.

Universal Compatibility: Completely matches the original factory mounting dimensions, requiring no structural modifications, suitable for routine maintenance and replacement, high cost-effectiveness.

Installation and Maintenance Points

Installation Specifications: Clean the bearing, journal, and bearing housing, removing burrs and oil. The journal surface roughness Ra ≤ 0.8 μm, and the bearing housing inner diameter tolerance +0.02~+0.05 mm.

Use the hot fitting method (heating the bearing to 80–100℃) or cold pressing method to ensure the bearing inner ring fits snugly against the journal and the outer ring is securely in place with the bearing housing. After installation, control the axial clearance to 0.05–0.1 mm.

Tighten the bearing cap bolts to the specified torque (M12 bolts 80 N·m), and add grease until overflowing to ensure adequate lubrication of the rollers and raceways.

Maintenance Recommendations: Check the bearing temperature (≤80℃), noise, and vibration every 800 working hours. If the temperature rises abnormally or unusual noises occur, disassemble and inspect.

Replace the bearing immediately if the bearing clearance is >0.15 mm or if pitting or peeling occurs on the rollers/raceways.