CAT 333-2915 Bearing – Needle(Debris Resistant)

CAT 333-2915 is a Caterpillar locking bearing roller assembly, which is essentially a needle roller bearing assembly with an anti-loosening locking structure. It is commonly used in the roller/guide mechanism of the traveling, steering or working device of engineering machinery. It can bear high radial loads and prevent axial movement. It is suitable for dusty and vibrating working conditions and can be used with retaining rings and bushings. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 333-2915, needle roller bearing locking assembly, structure: steel back + high carbon chromium steel needle rollers + anti-chip nylon cage + built-in locking ring, single weight approximately 0.42 kg, operating temperature -20℃ to +120℃, load type: pure radial high load, friction coefficient ≤0.006 (grease lubrication), lubrication method: grease lubrication (recommended Cat 2V-9822 grease), design life ≥8000 hours (normal operating conditions)

Key Dimensions
Inner diameter 34 mm (tolerance 0/-0.015 mm, mating shaft h7 tolerance), outer diameter 46 mm (tolerance +0.012/0 mm, mating seat hole H7 tolerance), height 17.8 mm (tolerance 0/-0.12 mm), needle roller diameter 3 mm, quantity 12, chamfered ends 1×45°, locking ring groove diameter 38 mm, groove width 2 mm, inner hole surface roughness Ra≤0.05 μm, outer circle cylindricity≤0.01 mm
Compatible Models and Accessories: Compatible with Cat 305E2/306E2 excavators (track rollers, guide rollers), 904M/906M loaders (steering rollers), with matching 235-9767 retainer assembly, 522-8339 bushing, 474-9675 O-rings
Rated Load: Radial rated dynamic load Cr=38 kN, radial rated static load Cor=95 kN, allowable linear velocity ≤3.0 m/s (grease lubrication), impact load ≥20 kN, ultimate pressure ≥220 MPa
Structural and Performance Advantages: The needle roller structure provides high radial load capacity, adaptable to confined installation spaces, and the anti-chip cage prevents impurities from entering the raceway, reducing the risk of wear.

The built-in locking ring prevents axial movement, eliminating the need for additional retaining rings, simplifying assembly, and adapting to high-frequency vibration conditions to ensure reliable component positioning.

The combination of a steel backing and high-carbon chromium steel needle rollers provides high hardness (needle rollers HRC60-64) and wear resistance. The nylon cage is lightweight and corrosion-resistant, suitable for dusty and harsh environments.

Installation and Maintenance Points: Before installation, clean the inner and outer surfaces of the component, the shaft, and the mounting hole. Check for cracks, rust, and deformation. Measure the dimensions of the mounting hole (46 mm, H7 tolerance) and the shaft (34 mm, h7 tolerance) to ensure an interference fit of 0.010-0.025 mm.

Use cold pressing for installation. Apply even pressure to the component end face using a special press to ensure the locking ring is fully embedded in the shaft groove. After installation, check for smooth rotation, ensuring no jamming or abnormal noise, axial movement ≤0.05 mm, and needle roller-shaft fit ≥90%. Maintenance and Replacement: Check the wear and lubrication condition every 1000 hours. If the inner diameter wear is >0.2 mm or the needle rollers peel off, replace them immediately. It is recommended to replace them at the same time as the shaft and seals to ensure the accuracy and sealing effect of the roller mechanism.