CAT 489-8206 BEARING-NEED

CAT 489-8206 is a Caterpillar genuine needle roller bearing with cage, suitable for the gearbox or final drive planetary gear mechanism of some Cat mini loaders and excavators. It is used to withstand radial loads and accommodate compact installation spaces. The following is pure raw data and does not include information on replacement parts (Cat® Parts).

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model: 489-8206; Type: Cage-supported radial needle roller bearing (no inner ring, journal as inner raceway); Material: Bearing steel (GCr15, hardness HRC60-64); Weight: 0.36 kg; Applicable working conditions: compact space, medium load, medium to low speed (≤3000 rpm); Operating temperature: -40℃ to +120℃; Lubrication method: oil lubrication (compatible with Cat DEO-ULS 15W-40 diesel engine oil); Protection rating: IP54; Fitting accuracy: journal h6, mounting hole H7

Key Dimensions
Inner diameter: d=35 mm (journal compatible, tolerance 0/-0.013 mm); Outer diameter: D=47 mm (tolerance 0/-0.019 mm); Width: B=22 mm (tolerance ±0.12 mm); Needle roller diameter: 2.5 mm (tolerance 0/-0.01 mm); Number of needle rollers: 18 needle rollers, cage material low carbon steel (SPCC), chamfered ends C1.5 (tolerance ±0.2 mm), no oil grooves/holes (relies on oil bath lubrication)

Performance Parameters: Radial rated load Cr=42 kN, limiting speed ≤4500 rpm (oil lubrication), coefficient of friction ≤0.003 (oil lubrication condition), fatigue life ≥12000 hours (normal condition), rated static load Cor=65 kN, elastic modulus 208 GPa, linear expansion coefficient 12×10⁻⁶/℃

Structural and Performance Advantages:
No inner ring design: saves radial space, the journal directly serves as the inner raceway, adaptable to compact transmission mechanisms, reducing weight and cost.

Cage guidance: 18 needle rollers are evenly distributed, avoiding contact friction between the rollers, reducing operating noise and wear, and improving speed adaptability.

Bearing steel material: the needle rollers are quenched and tempered, with excellent hardness and wear resistance, suitable for vibration and impact conditions in engineering machinery.

High-precision manufacturing: Precise control of needle roller diameter and quantity ensures even load distribution and extends bearing life.

Installation and maintenance points (raw data)

Installation: Clean the journal and mounting hole (free from oil, rust, and burrs). The journal surface roughness Ra ≤ 0.4 μm. The mounting hole and bearing should have an interference fit (interference 0.012-0.018 mm). Use a special tooling to press evenly (do not hammer). After installation, check for smooth rotation (no jamming) and ensure unobstructed oil passages.

Maintenance: Check the oil level and quality every 500 hours. Add suitable machine oil if the oil level is below the minimum mark. Check journal wear every 2000 hours. Repair/replace the journal if wear exceeds 0.05 mm. Avoid overload and insufficient lubrication to prevent needle roller fatigue damage.

Troubleshooting: Abnormal operating noise is mostly due to worn needle rollers or damaged cage, requiring bearing replacement; abnormal temperature rise is mostly due to poor lubrication, check the oil passage and add oil; if the radial clearance is too large, replace the bearing directly (clearance cannot be adjusted without an inner ring).