Description
CAT 7M-5387 BEARING A
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The CAT 7M-5387 is a double-row tapered roller bearing assembly designed by Caterpillar specifically for gearboxes/drivetrains. It integrates inner and outer rings, rollers, and a cage, and is suitable for heavy-duty and shock applications. It is used for differential, planetary carrier, or driveshaft support. The following is structured technical and application information.
Core Technical Parameters
Item Details
Basic Attributes Model 7M-5387, Material: Carburized alloy steel (inner ring/outer ring/roller), Cage: Stamped steel plate, Overall quenching + tempering, Inner ring hardness: 60-64 HRC, Outer ring hardness: 58-62 HRC, Single weight: Approximately 3.2 kg, Operating temperature: -40℃ to +120℃, Lubrication method: Oil lubrication, Assembly tolerances: Inner ring inner diameter k5, Outer ring outer diameter P6, Clearance grade: C3
Key Dimensions Inner diameter: 85 mm, Outer diameter: 150 mm, Total width: 45 mm, Number of rollers: 2×18, Roller diameter: 16 mm, Taper angle: 12°, Inner and outer ring flange thickness: 10 mm, Locating groove diameter: 140 mm, Width: 5 mm, Center coaxiality: ≤0.04 mm, Surface roughness: Ra≤0.6 μm, Parallelism of both ends: ≤0.03 mm
Applicable Models and Locations Compatible with the gearbox output shaft, differential housing, or planetary gear carrier of Cat 950H/966H loaders, 336D/340D excavators, and D8T bulldozers. One piece per location. Suitable for speeds ≤3000 rpm, rated axial load ≤80 kN, and radial load ≤180 kN.
Performance Parameters: Rated radial dynamic load 420 kN, rated radial static load 580 kN, rated axial dynamic load 120 kN, rated axial static load 280 kN, coefficient of friction ≤0.002 (oil lubrication), fatigue life ≥8000 hours, recommended installation interference 0.015-0.025 mm.
Structural and Performance Advantages: Double-row tapered roller bearing structure: Can simultaneously withstand radial and bidirectional axial loads, suitable for complex stress conditions in transmission systems, increasing load capacity by approximately 70% compared to single-row bearings, and effectively suppressing shaft movement.
Carburized alloy material: Carburized and quenched, with a hardened layer depth of 2.0-2.5 mm, providing good core toughness and strong impact resistance, preventing breakage or chipping under heavy loads, suitable for frequent start-stop and load fluctuation conditions in engineering machinery.
Integrated design: Pre-assembled cage and rollers, eliminating the need for on-site assembly, resulting in high installation efficiency. The cage is made of stamped steel plate, which is lightweight and rigid, ensuring high roller guiding accuracy and reducing operating noise (≤75 dB).
C3 clearance adaptation: Reserved for thermal expansion, adapting to the temperature rise during transmission system operation (≤120℃), preventing bearing seizure due to thermal expansion while ensuring operational accuracy.
Installation and Maintenance Points
Installation Procedure: Clean the journal and bearing housing bore, ensuring they are free of oil and rust. For the inner ring, use hot fitting (100-120℃, heating time 15-20 minutes) or cold pressing (vertical pressing with a special press). For the outer ring, cold press it into the bearing housing. After installation, check that the end face runout is ≤0.05 mm and that rotation is smooth and without jamming. Add gear oil (API GL-5 grade) according to the machine model requirements to ensure adequate lubrication.
Maintenance Cycle: Check bearing temperature (≤80℃) and noise every 2000 hours. Change the gear oil and check bearing clearance every 5000 hours (replace if ≥0.15 mm). In dusty or high-temperature working environments, shorten the maintenance cycle to 1500 hours.
Common faults and solutions: Overheating of bearings is mostly due to poor lubrication or insufficient clearance. Change the gear oil and adjust the clearance. Abnormal noise is mostly due to worn rollers or damaged cage. Replace the bearing assembly. Loose outer ring is mostly due to insufficient interference fit. Re-press-fit or replace the bearing housing.
