CAT 538-4277 BEARING

CAT 538-4277 is a genuine Caterpillar sleeve bearing, suitable for use in the boom, stick, and other connecting rod components of construction machinery. It supports rotational motion and bears heavy loads. The following are core original specifications and application information; replacement parts (Cat®) are not included.

Core Technical Parameters

Item Details
Part Model: CAT 538-4277 (BEARING – SLEEVE)

Product Type: Heavy-duty connecting rod bushing bearing, suitable for boom, stick, and other connecting rod components, used to support rotational motion and withstand radial heavy loads and minor impact loads.

Material: Matrix: High-grade bearing steel (52100), surface hardened for high wear resistance and high strength.

Surface Treatment: Precision grinding of the inner hole, surface roughness Ra ≤ 0.1 μm, hardness HRC 58–62, ensuring precision and wear resistance with the pin.

Single Weight: Approx. 0.98 kg (2.16 lbs)

Key Dimensions: Inner diameter 50.8 mm (2.0 in), outer diameter 63.5 mm (2.5 in), length 76.2 mm (3.0 in), suitable for standard pins and connecting rod holes.

Matching Requirements: Suitable for shaft diameter tolerance f8, mounting hole tolerance H8, recommended radial clearance. 0.02–0.04 mm
Operating Temperature: -40℃ ~ +120℃
Load Capacity: Rated radial dynamic load 78 kN, rated radial static load 195 kN, suitable for heavy-duty conditions
Lubrication Method: Grease lubrication (CAT lithium-based grease recommended), initial fill amount is 2/3 of the bearing cavity, refill every 500 hours under heavy-duty conditions
Sealing Characteristics: Suitable for connecting rod seals, protection rating IP54, suitable for dusty and vibration conditions
Structure and Core Characteristics: High-strength Material: Made of high-grade bearing steel, quenched to a hardness of HRC 58–62, possessing excellent wear resistance and fatigue strength, suitable for heavy-duty Cat®…

Precision Dimensional Control: Strict tolerances for inner and outer diameters, suitable for standard pins and connecting rod holes, ensuring installation accuracy and motion stability.

Heavy-duty fit: Optimized wall thickness and surface treatment allow it to withstand heavy radial loads and minor impact loads, meeting the operational needs of booms, sticks, and other linkage components in construction machinery (Cat®…).

Sealing system compatibility: Compatible with linkage seals to effectively prevent dust and gravel intrusion, protecting bearings and pins and extending service life.

Compatible models and applications:

Excavators: 320D, 330D, etc., used in boom-stick and stick connection shafts, stick-bucket connection shafts, and other linkage components to support rotational movement and withstand heavy loads and impact loads.

Loaders: 950K, 966K, etc., compatible with boom lifting links, steering links, etc., ensuring operational stability and reliability.

Core application: Used in construction machinery linkage bushings to support rotational movement, withstand heavy radial loads and minor impact loads, suitable for dusty and vibrating conditions, extending the service life of linkages and pins (Cat®…).