Description
CAT 172-6050 45mm Inner Diameter Needle Roller Thrust Bearing
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The CAT 172-6050 is a 45mm inner diameter needle roller thrust bearing (combined radial needle roller + thrust needle roller bearing) designed by Caterpillar specifically for mini excavators and loaders. Its core function is axial positioning and light-to-medium load thrust in hydraulic pumps, gearboxes, or differentials. It is compatible with Cat 305 and 306 mini excavators and 903 and 904 mini loaders. The following is precise technical and application information.
Core Parameters (Precise Version)
Item Details
Basic Attributes
Model 172-6050, Inner Diameter 45mm Needle Roller Thrust Bearing (NKXR type, with cage), unidirectional axial load bearing + auxiliary radial positioning, suitable for shaft end/housing end face positioning in compact spaces, 1-2 pieces per unit
Compatible Models
Cat 305.5, 306, 306.5 mini excavators, 903C, 904H mini loaders, compatible hydraulic pump model 172-6049, gearbox model 416-4002, differential model 155-4025
Material and Process
Bearing steel (52100 chromium alloy), inner ring/seat ring hardness HRC 60-64, needle roller hardness HRC 62-66, stamped steel cage, no seal (sealing depends on operating conditions), radial clearance C2 (light preload), precision class ISO P0
Key Dimensions
Inner Diameter 45mm diameter, outer diameter 65mm, needle roller center circle diameter 52mm, width 12mm (axial), needle roller diameter 3mm, number of needle rollers 18, seat ring thickness 4mm, locating stop diameter 45mm (depth 1.5mm), weight approximately 0.18kg
Performance Parameters: Basic rated dynamic load 28.5kN, basic rated static load 65.2kN, grease lubrication limiting speed 3200rpm, oil lubrication limiting speed 4500rpm, operating temperature -40℃ to +120℃, axial load ≤25kN, radial load ≤5kN
Core Functions and Application Scenarios:
Axial Thrust: Unidirectional axial load (≤25kN), restricting axial movement of the shaft, suitable for positioning requirements of hydraulic pump drive shafts, gearbox output shaft ends, differential side covers, etc.
Radial Assist: The radial needle roller structure assists in bearing light radial loads (≤5kN), suitable for low-speed, low-radial-load conditions, and prevents shaft misalignment.
Typical Locations: Thrust end of hydraulic pump drive shaft, end cover of gearbox second shaft, side cover of differential housing. Used to position bearings and bear axial thrust, suitable for compact installation spaces.
Installation and Maintenance Points
Before Installation: Clean the journal and bearing housing bore, check for needle roller deformation and cage damage; journal surface hardness ≥HRC 58, roughness Ra≤0.8μm, ensure mounting surface parallelism ≤0.05mm.
During Installation: Press the bearing in using a special tool to prevent needle roller misalignment; after positioning, check axial clearance 0.02-0.05mm to ensure no jamming; apply extreme pressure lithium-based grease (NLGI 2) after installation. Maintenance and replacement: Check the wear and clearance of the thrust surface every 5000 hours. If abnormal noise, axial clearance exceeding 0.1mm, or needle roller peeling occurs, replace immediately. Welding or repair by welding is prohibited.
