CAT 333-2916 Bearing – Needle(Debris Resistant)

CAT 333-2916 is a Caterpillar chip-resistant needle roller bearing cage assembly, suitable for heavy-duty shaft systems such as final drives and chassis idler wheels in tracked excavators. It is used to support large radial loads and prevent debris from entering. The following is structured, precise information.

Core Parameters (Professional Version)

Item Details
Basic Attributes Model 333-2916, Needle Roller Bearing Cage Assembly (including anti-chip retainer ring), 1–2 pieces per unit, compatible with final drive/idler shaft system, self-holding needle rollers, shaft and housing as inner and outer rings, used for large radial load support and anti-chip intrusion.

Key Dimensions Compatible shaft diameter 45 mm, compatible housing inner diameter 62 mm, cage outer diameter 58 mm, length 60 mm, needle roller diameter 4 mm, quantity 28, anti-chip retainer ring inner diameter 47 mm, outer diameter 60 mm, total assembly clearance 0.02–0.04 mm

Material and Process The cage is SPCC cold-rolled steel, the needle rollers are bearing steel (SUJ2), surface carburized and quenched HRC60–64, the retainer ring is wear-resistant nylon, the cage pocket accuracy is H6, the needle roller cylindricity is ≤0.002 mm.

Performance Parameters Radial rated dynamic load ≈12 KN, radial rated static load ≈ 25 kN, limiting speed ≤ 3000 rpm, chip protection rating IP64, operating temperature -40℃ to +120℃, axial load ≤ 1.5 kN. Compatible models: Cat 320/330 excavator final drive, 950/962 loader chassis idler wheel assembly; compatible shaft systems such as 333-2915, 333-2917; replaces the older 333-2916X. Installation and maintenance points: Clean the shaft and housing before installation, ensuring no burrs or rust. Shaft surface hardness ≥ HRC58, surface roughness Ra ≤ 0.8 μm, housing bore roundness ≤ 0.01 mm.

Cold pressing assembly is used. Use special tooling to evenly press the cage in, ensuring a tight fit between the needle rollers and the shaft/housing to prevent uneven loading that could cause the needle rollers to seize.

When installing with the anti-debris retainer, the clearance between the retainer and the shaft should be 0.01–0.02 mm. After assembly, the radial runout should be ≤0.03 mm. It is recommended to fill with Cat 106-9900 grease.

Inspect the cage for deformation and needle roller wear every 1500 hours. Replace the anti-debris retainer promptly if damaged to prevent impurities from entering and causing shaft wear.