CAT 081-4890 BEARING

CAT 081-4890 is a Caterpillar genuine single-row tapered roller bearing (including inner and outer rings), suitable for complex load-bearing components such as gearboxes and drive axles in medium-sized construction machinery. The following are precise original factory specifications and application information, excluding replacement parts (Cat®)…

Core Technical Parameters

Item Details
Part Model: CAT 081-4890 (Single Row Tapered Roller Bearing, including inner ring cone + outer ring cup)

Material: Inner ring/outer ring/roller are made of high carbon chromium bearing steel (AISI 52100), hardness 60–64 HRC; cage is made of stamped steel plate, galvanized for corrosion protection.

Key Dimensions: Inner diameter 65 mm (2.559 in), outer diameter 120 mm (4.724 in), width 38 mm (1.496 in), cone angle 10°, chamfer radius r=2 mm

Rated Parameters: Radial rated dynamic load 92.0 kN, radial rated static load 105.0 kN; Axial rated dynamic load 45.0 kN, axial rated static load 58.0 kN; Limiting speed 4500 rpm (oil lubrication), 3200 rpm (grease lubrication); Operating temperature -30℃ ~ +120℃

Unit Weight: Approx. 1.42 kg (3.131 lbs)

Tolerances: Inner diameter tolerance P6, outer diameter tolerance P6, radial clearance C3, contact angle accuracy ±15′, radial runout ≤ 0.018 mm, surface roughness Ra ≤ 0.4 μm

Surface Treatment: Inner and outer ring surfaces are anodized and blackened; roller surfaces are polished. Suitable for oil or grease lubrication, improving fatigue resistance and wear resistance.

Structure and Core Characteristics:
Single-row tapered roller structure: The rollers and raceways have a tapered contact, capable of simultaneously withstanding large radial loads and unidirectional axial loads. Suitable for gearboxes, drive axles, and other components subjected to complex stresses, transmitting power and absorbing vibration.

Modular Design: Inner ring, outer ring, rollers, and cage are supplied as a single unit, facilitating installation, precise positioning, and compact space in medium-sized equipment, making maintenance and replacement easy.

High-precision manufacturing: P6 tolerance and C3 clearance ensure stable operation at low and medium speeds, reducing vibration and noise, suitable for medium-sized equipment such as loaders and mini excavators.

Impact-resistant reinforcement: The stamped steel plate cage has strong impact resistance, suitable for harsh working conditions such as mining and infrastructure construction, extending bearing life and reducing downtime due to failures.

Compatible models and application scenarios:
Compatible equipment: CAT 938M loader, 313GC excavator, D4K2 bulldozer, and other medium-sized construction machinery.

Core applications: Used in planetary gearbox mechanisms, drive axle differentials, drive shaft supports, etc., to transmit power, absorb vibration, and ensure stable operation of components, suitable for medium-light to medium-heavy load conditions.