Description
CAT 309-8477 Bearing – Ball(Debris Resistant)
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The CAT 309-8477 is a Caterpillar-specific single-row deep groove ball bearing, commonly used in the gearboxes, drive axles, or hydraulic pumps of wheel loaders, mini excavators, and other equipment. It is compatible with Cat 906, 907, and 908 mini loaders and 307/308/309 series excavators. The following is precise technical and application information.
Core Parameters (Precise Version)
Item Details
Basic Attributes Model 309-8477, Single-row deep groove ball bearing, open type without seal, with stamped steel cage, suitable for medium and low speed, medium radial load conditions, allows small amount of axial load in both directions
Compatible Models Cat 906, 907, 908 mini wheel loaders, 307/307.5/308/309 series mini excavators, compatible gearbox models 416-4000, 416-4001, drive axle models 155-4022, 155-4023, etc.
Material and Process Bearing steel (52100 chromium alloy), inner/outer ring hardened (hardness HRC 60-64), ball hardness HRC 62-66, stamped steel cage, no seal, contactless dust cover, radial clearance C0 (standard), precision class ISO P0
Key Dimensions Inner Diameter 38.10mm (1.5 inches), outer diameter 76.20mm (3.0 inches), width 19.05mm (0.75 inches), chamfer C0.8, weight approx. 0.32kg
Performance Parameters: Basic rated dynamic load 28.5kN, basic rated static load 16.2kN, grease-lubricated limiting speed 6500rpm, oil-lubricated limiting speed 8000rpm, operating temperature -40℃ to +120℃, installation interference 0.01-0.03mm
Core Functions and Applications:
Load Bearing and Friction Reduction: Withstands moderate radial loads, reduces friction between the shaft and housing, and ensures smooth operation of gearbox gears, drive axle half-shafts, or hydraulic pump shafts.
Positioning and Guiding: Limits radial displacement of the shaft, assists in shaft positioning, and adapts to parts such as gearbox shafts and drive axle differential housings.
Positioning and Guiding: Restricts radial displacement of the shaft, assists in shaft positioning, and adapts to parts such as gearbox shafts and drive axle differential housings. Suitable operating conditions: Applicable to speeds ≤3000 rpm and radial loads ≤20 kN, relying on forced lubrication or splash lubrication to avoid dry friction.
Installation and Maintenance Points
Before Installation: Clean the journal and bearing housing bore, and check the bearing for deformation, cracks, or surface peeling; measure the clearance between the journal and the bearing inner diameter to be 0.01-0.03 mm. Prepare the press-in tool and hydraulic pump station (press-in pressure approximately 5-8 kN).
During Installation: Keep the bearing coaxial with the shaft/housing bore during press-in, applying uniform press-in force. After press-in, check that the bearing end face is flush with the shaft shoulder/housing bore plane, without any misalignment; inject lithium-based grease (NLGI 2) after installation to ensure adequate lubrication.
Maintenance and Replacement: Check the bearing’s operating noise and temperature every 3000 hours. If abnormal noise occurs, the temperature exceeds 80℃, or the radial clearance exceeds 0.15 mm, replace the bearing immediately. Welding or repair welding is prohibited.
