CAT 538-3071 BEARING-SEM

CAT 538-3071 is a Caterpillar genuine SEM (Sealed Radial Roller) bearing, commonly used in the final drive, gearbox, or hydraulic motor of heavy equipment such as excavators and loaders. It features a sealed, dustproof design, suitability for heavy-duty and vibration-prone conditions, ensuring stable rotation of components and power transmission. The following is key information.

Core Technical Parameters

Item Details
Part Model: CAT 538-3071 (SEM Sealed Radial Roller Bearing, Single Unit)

Material: Inner Ring / Outer Ring: Chromium Bearing Steel (GCr15), Quenched Hardness HRC 60-64; Rolling Elements: High Carbon Chromium Bearing Steel; Cage: Reinforced Nylon PA66; Seal: Nitrile Rubber (NBR)

Key Dimensions: Inner diameter approx. 80mm, outer diameter approx. 140mm, width approx. 35mm, sealing lip thickness 2.5mm, radial clearance 0.015-0.025mm, suitable for 80mm shaft diameter mounting positions

Single Weight: Approx. 1.85kg (4.08 lbs)

Compatible Machines: Final drive gearboxes, travel motor output ends, wheel axles, etc. in CAT 320D2, 336D2 excavators, 950M, 966K loaders, etc.

Performance Characteristics: Double-sided NBR Sealed, dustproof, waterproof, and oil-proof, suitable for operating temperatures from -40℃ to +120℃; rated dynamic load ≥105kN, rated static load ≥120kN, vibration-resistant and impact-resistant, suitable for heavy-duty continuous operation.

Structure and Core Functions

Sealing Protection Structure: Double-sided NBR sealing lips combined with a metal skeleton effectively block external dust and mud, prevent internal grease leakage, extend bearing life, and are suitable for dusty and humid conditions.

Heavy-duty Load Capacity: Chromium bearing steel is quenched, and the rolling elements and raceways are precision ground, capable of withstanding radial and impact loads from heavy equipment, preventing premature bearing wear or failure, and suitable for long-term heavy-duty operation.

Stable Rotational Accuracy: Reinforced nylon cage guides the rolling elements to distribute evenly, reducing friction and vibration, ensuring rotational accuracy, improving transmission efficiency, and suitable for high-frequency rotation and start-stop conditions.

Maintenance Convenience: Pre-lubricated design eliminates the need for additional grease after installation, simplifying maintenance procedures, reducing maintenance costs, and meeting the needs of rapid equipment repair.

Compatible Models and Application Scenarios

Compatible Equipment: CAT 320D2, 323D2, 336D2 series excavators, 950M, 966K, 972M series loaders, and the final drive and travel systems of some small bulldozers.

Installation Locations: Support positions for the input and output shafts of the final drive gearbox, the shaft connecting the travel motor and wheel ends, the hydraulic pump drive shaft, and other parts requiring radial support and sealing protection.

Core Purpose: Provides radial support for rotating shafts, absorbs vibration and shock, prevents wear on shafts and housings, ensures stable operation of the final drive and travel systems, and is suitable for complex working conditions such as heavy loads, dust, and humidity.