CAT 517-3130 Bearing Assembly-Roller

CAT 517-3130 is a Caterpillar single-row cylindrical roller bearing, suitable for slewing bearings, travel motors, or gearbox input shafts in excavators, loaders, and other equipment. It is used to withstand large radial loads and medium-speed operating conditions. The following is structural technical information.

Core Parameters (Professional Version)

Project Details
Basic Attributes
Model 517-3130, Single Row Cylindrical Roller Bearing (NU Type, Inner Ring Without Flange), 1 piece per unit, suitable for slewing bearings and travel motor final drives of excavators such as 320D/323D/336D, bearing pure radial loads, allowing slight axial displacement of the shaft relative to the bearing housing, suitable for medium-speed operating conditions.

Key Dimensions
Inner diameter 120 mm, outer diameter 215 mm, width 58 mm, roller diameter 16 mm, number of rollers 28, inner ring raceway diameter 120 mm, outer ring raceway diameter 199 mm, clearance grade C3 (radial clearance 0.10–0.14 mm), suitable for shaft diameter 120 mm, seat bore diameter 215 mm

Material and Manufacturing Process
Inner/outer ring material is chrome steel (AISI 52100), roller material is AISI 52100, integrally hardened HRC60–64, cage made of stamped steel plate, roller surface roughness Ra≤0.4 μm, inner and outer ring raceway roundness≤0.005 mm

Performance Parameters: Basic rated dynamic load Cr≈320 kN, basic rated static load Cor≈380 kN, limiting speed (oil lubrication) 3200 rpm, (grease lubrication) 2000 rpm, operating temperature -40℃ to +120℃, fatigue life ≥8000 hours, suitable for radial load as the main condition, medium speed operation.

Compatible Machines: Cat 320D/320D2/323D/323D2/336D excavators, compatible with slewing bearings and travel motor final drive shafts, matching bearing housing model such as 420-5763 bearing sleeve, compatible with shaft diameter 120 mm. Transmission System Installation and Maintenance Points:

Before installation, clean the bearing’s inner and outer rings, journal, and housing bore. The journal surface hardness should be ≥HRC58, roughness Ra≤0.8 μm, and housing bore roundness ≤0.01 mm, free of burrs and rust.

Cold press assembly: Use a special tooling to press the bearing evenly, avoiding bearing deformation or roller damage. Ensure a close fit with the bearing housing end face, with end face runout ≤0.02 mm. Welding or heat fitting is prohibited.

After assembly, check the radial clearance (0.10–0.14 mm) and the contact area with the shaft mating surface (≥90%). Fill with Cat 106-9900 grease (grease cavity volume 1/3–1/2).

Every 1500 hours, check for bearing wear and roller damage. Replace the bearing immediately if the inner diameter wear >0.1 mm or radial clearance >0.2 mm to prevent shaft vibration or uneven loading.