CAT 208-9008 BEARING

CAT 208-9008 (2089008) is a Caterpillar original single-row deep groove ball bearing, suitable for light to medium load rotating components such as hydraulic pumps, gearboxes, and slewing mechanisms. The following is purely precise information (without additional description) Cat®…:

Core Parameters and Information

Item Details
Part Model: CAT 208-9008 Deep Groove Ball Bearing

Part Type: Single-row deep groove ball bearing (open type, with filler groove), primarily bearing radial loads, capable of withstanding small amounts of bidirectional axial loads, suitable for medium to low speed rotating components, ensuring rotational accuracy and stability

Material: Inner ring / Outer ring / Balls: High carbon chromium bearing steel (GCr15), hardened to HRC60-64; Cage: High-quality low carbon steel, galvanized surface, suitable for operating conditions from -40℃ to 120℃

Key Dimensions: Inner diameter 40.00 mm (1.5748 in), Outer diameter 80.00 mm (3.1496 in), Width 18.00 mm (0.7087 in), ball diameter 7.144 mm (0.2812 in), number of balls 11, cage pitch circle diameter 60.00 mm (2.3622 in)

Structural Features: Open structure with filling groove, facilitating the assembly of more balls and increasing radial load capacity; stamped cage ensures even ball distribution, reducing friction and wear; suitable for low-to-medium speed operation; allows for slight angular deviation (≤2°) to compensate for installation coaxiality errors.

Compatible Structures: Hydraulic pump drive shaft bearings, gearbox second shaft support bearings, slewing mechanism pinion shaft bearings, fan drive shaft bearings.

Applicable Operating Conditions: Suitable for radial loads ≤33.6 kN, axial loads ≤5.8 kN, speeds ≤9500 rpm, and non-severe impact conditions; used for supporting light to medium load rotating components to ensure smooth operation.

Compatible Machines and Assemblies:
Excavator: CAT 305.5E2, 306E2 (Hydraulic pump drive shaft bearing assembly, slewing mechanism pinion shaft bearing assembly)

Loaders: CAT 906M, 907M (Gearbox second shaft support bearing assembly, fan drive shaft bearing assembly)

Small road rollers: CAT CB24B, CB25B (Vibratory shaft bearing assembly, travel drive axle bearing assembly)

Compatible assemblies: 305.5E2 hydraulic pump bearing assembly, 906M gearbox second shaft bearing assembly, CB24B vibratory shaft bearing assembly

Installation and Fitting Points: Inner ring transition fit with shaft (clearance 0-0.010 mm), outer ring transition fit with bearing housing (clearance 0-0.015 mm). Use a copper hammer or installation sleeve to evenly tap into place. Do not directly strike the bearing end face to prevent damage to the steel balls and raceways.

Before installation, clean the journal, bearing housing bore, and bearing, ensuring there are no burrs, oil stains, or rust. Inspect the bearing for cracks and deformation, and ensure the steel balls rotate freely without jamming or abnormal noise.

After installation, the bearing end face should fit snugly with the locating component, with radial runout ≤0.02 mm and axial movement ≤0.08 mm. Operation should be free of abnormal vibration and noise, with adequate lubrication and no overheating.

During disassembly, use a dedicated puller to evenly pull out the inner ring. Do not pry forcefully to avoid damaging the shaft and bearing. Before reusing, check the raceway and steel ball wear; replace if necessary.