CAT 298-3485 Single Row Tapered Roller Bearing

CAT 298-3485 is a Caterpillar genuine single-row tapered roller bearing assembly (including inner ring, outer ring, rollers, and stamped steel cage, no seal), suitable for drive axles, transmissions, or differentials of mini excavators and loaders. It is designed to withstand both radial and bidirectional axial loads simultaneously, and is suitable for medium-to-low speed heavy-duty applications. The following are key information about Cat®…

Core Technical Parameters

Item Details
Part Model: CAT 298-3485 (Single Row Tapered Roller Bearing, Stamped Steel Cage, No Seal/Dust Cover)

Material: Inner/outer ring and rollers are made of 52100 bearing steel, integrally hardened (HRC 60-64), hardened layer depth ≥ 1.5 mm; suitable for -40℃ to +120℃ operating conditions, compatible with oil/grease lubrication

Key Dimensions: Inner diameter 65 mm (2.559 in), outer diameter 100 mm (3.937 in), width 23 mm (0.9055 in), roller big end diameter 9.2 mm, number of rollers 14

Single Weight: Approx. 0.62 kg (1.367 lbs)

Tolerances and Fits: Inner diameter tolerance m6 (+0.013/+0.002 mm), outer diameter tolerance… G6 (+0.012/-0.005 mm), Radial clearance C3, Rotational accuracy P0
Load capacity: Radial rated dynamic load 58 kN, Axial rated dynamic load 32 kN, Radial rated static load 65 kN, Axial rated static load 38 kN, Limiting speed 5200 rpm (oil lubrication) / 3800 rpm (grease lubrication)
Structure and core functions:
Composite load-bearing: Tapered roller line contact design, capable of simultaneously bearing radial and bidirectional axial loads, suitable for drive axle main reducers, gearbox output shafts, and other components requiring positioning and load bearing.

Rigid positioning: Separate inner and outer ring structure, clearance can be adjusted during installation to ensure precise shaft positioning and reduce axial movement and vibration during operation.

Flexible assembly: The cage evenly distributes the rollers; the inner ring and shaft, and the outer ring and bearing housing can be installed separately, suitable for batch maintenance and improving assembly efficiency.

Wear-resistant and impact-resistant: Made of 52100 bearing steel with integral quenching, offering strong resistance to pitting and deformation, suitable for frequent start-stop and impact conditions in construction machinery.

Compatible Models and Application Scenarios

Compatible Equipment: CAT 307E2/308E2 mini excavators, 908M/909M loaders, 430F2 backhoe loaders, C4.4 engine drive axles.

Core Applications: Used in drive axle differentials, gearbox two-shaft supports, steering knuckle pivot bearings, and hydraulic motor output ends, suitable for low to medium speeds (≤2800 rpm) and radial + axial combined load conditions.

Installation and Maintenance Points

Installation: Clean the journal and bearing housing bore, ensuring no burrs or oil contamination; ensure the inner ring has an interference fit with the shaft (0.018-0.028 mm), heat to 80-100℃ for hot fitting, and do not directly strike the roller end face.

The outer ring and bearing housing have a clearance fit (0.012-0.022 mm). After press-fitting, the coaxiality should be ≤ 0.06 mm. Adjust the preload according to the original manufacturer’s specifications (axial clearance 0.05-0.10 mm).

Maintenance
Lubrication: Use CAT DEO-ULS diesel engine oil for oil lubrication and NLGI Grade 2 lithium-based grease for grease lubrication. Add grease/change oil every 600-900 hours, with the oil level reaching the center of the bearing.

Inspection: Regularly monitor vibration and temperature. Stop the machine and inspect if the vibration speed exceeds 5.0 mm/s or the temperature exceeds 85℃. Replace the bearing immediately and inspect the journal/seat bore for wear if the clearance exceeds 0.20 mm.