CAT 123-9353 BEARING

CAT 123-9353 is a Caterpillar genuine single-row deep groove ball bearing, suitable for the boom, stick, and other pin joints of excavators and loaders. It is used to withstand radial loads and allows for slight bidirectional axial displacement, ensuring smooth rotation of the hinged parts. It is suitable for medium to heavy-duty vibration conditions. The following are the key information.

Core Technical Parameters

Item Details
Part Model: CAT 123-9353 (Single Row Deep Groove Ball Bearing, High Carbon Chromium Bearing Steel, Stamped Steel Cage, Double-Sided Seal, with Grease Filling Groove)

Material: GCr15 bearing steel, Hardness HRC 60-64, Tensile Strength ≥ 1800 MPa, Contact Fatigue Life ≥ 1000 hours, Suitable for -40℃ to +120℃ operating conditions

Key Dimensions: Inner Diameter 50 mm (1.9685 in), Outer Diameter 90 mm (3.5433 in), Width 20 mm (0.7874 in), Sealing Lid Thickness 1.5 mm, Lubrication Groove Diameter 70 mm

Unit Weight: Approx. 0.48 kg (1.0582 lbs)

Tolerances and Performance: Inner Diameter Tolerance 0/-0.015 mm, Outer Diameter Tolerance +0.015/0 mm, Radial Clearance C3 (0.025-0.045 mm), rated radial load 35 kN, rated axial load 10 kN, limiting speed 6000 rpm (grease lubrication)

Core Functions: Primarily bears radial loads, allows for a small amount of bidirectional axial displacement, suitable for low to medium speed (≤3000 rpm) rotational conditions, double-sided seals prevent dust and moisture intrusion, extending grease life.

Structure and Core Functions:
Deep Groove Load-Bearing Structure: The inner ring, outer ring, and steel balls form deep groove tracks, capable of simultaneously bearing radial loads and light bidirectional axial loads, suitable for the combined oscillating and rotating motions of the hinged parts.

Sealing and Dustproof Design: Double-sided nitrile rubber (NBR) seals, IP65 protection rating, prevents dust and moisture from entering the bearing interior, avoids wear between the steel balls and raceways, suitable for outdoor dusty and humid conditions.

Lubrication and Cage: Built-in lithium-based grease, filling cycle 500 hours, stamped steel cage evenly separates the steel balls, reducing friction and noise, improving operational smoothness.

High load-bearing capacity and durability: GCr15 bearing steel undergoes quenching and tempering treatment, resulting in high contact fatigue strength. It is suitable for medium- and heavy-duty hinged parts such as the boom and stick, and exhibits excellent resistance to impact and vibration.

Compatible Machines and Application Scenarios

Compatible Equipment: CAT 320D/323D/326D excavators, 950M/962M loaders, 420F2 backhoe loaders.

Core Application: Installed at hinged parts such as boom pins, stick pins, and connecting rod joints, it supports pin rotation, bears radial loads, and compensates for slight axial displacement caused by installation errors, ensuring smooth joint rotation.