CAT 133-5907 BEARING

CAT 133-5907 is a Caterpillar original single-row cylindrical roller bearing (including inner ring/outer ring/rollers/cage assembly, separable), suitable for heavy-duty transmission components such as gearboxes and drive axles in Cat medium and large excavators and loaders. The following is pure original data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 133-5907, Type Single-row cylindrical roller bearing (separable inner/outer ring, straight flange, inner ring guided), Material Bearing steel (GCr15SiMn, quenching hardness HRC60-64), Weight 1.85 kg, Applicable working conditions Heavy load, medium-high speed (≤4000 rpm), impact and vibration conditions, Working temperature -40℃ to +120℃, Lubrication method Oil lubrication (compatible with Cat DEO-ULS 15W-40 diesel engine oil), Protection rating IP54, Fitting accuracy Inner ring k5 (shaft) / Outer ring H7 (bore)

Key Dimensions Inner diameter d=70 mm (tolerance 0/-0.015 mm), Outer diameter D=110 mm (tolerance 0/-0.018 mm), Width B=25 mm (tolerance ±0.12 mm), Roller diameter 7 mm (tolerance 0/-0.01 mm), 24 rollers, cage material: stamped low carbon steel (SPCC, galvanized surface), inner ring large end chamfer C2 (tolerance ±0.2 mm), outer ring small end chamfer C1.5 (tolerance ±0.2 mm), no oil groove/oil hole (relies on oil bath lubrication)

Performance Parameters: Radial rated load Cr=98 kN, rated static load Cor=112 kN, allowable speed ≤4500 rpm (oil lubrication), coefficient of friction ≤0.002 (oil lubrication condition), fatigue life ≥15000 hours (normal condition), elastic modulus 208 GPa, linear expansion coefficient 12×10⁻⁶/℃, radial clearance 0.015-0.035 mm (standard group)

Structural and Performance Advantages: Separable structure: inner and outer rings are separable, facilitating installation and removal on the shaft, suitable for assembly operations in confined spaces.

Cylindrical roller design: Bears only radial loads, suitable for drive axles, gearboxes, and other transmission components subjected to purely radial forces, offering strong load-bearing capacity.

Inner ring guidance: Rollers are guided by the inner ring flange, ensuring good operational stability, suitable for medium- and high-speed operating conditions, and reducing the risk of roller slippage.

Stamped cage: Lightweight design with even roller distribution, reducing friction and noise, and extending bearing life.

Installation and maintenance points (raw data)

Installation: Clean the journal and housing bore (free from oil, rust, and impurities). The inner ring and journal should have an interference fit (interference 0.012-0.020 mm), and the outer ring and housing bore should have a transition fit (clearance 0-0.015 mm). Use a special tooling to press evenly (do not strike). After installation, check for smooth rotation (no jamming) and ensure unobstructed oil passages.

Maintenance: Check oil level and quality every 500 hours; add suitable engine oil if the oil level is below the minimum mark. Check bearing clearance every 2000 hours; replace the bearing if clearance exceeds 0.1 mm. Avoid overload and insufficient lubrication to prevent roller fatigue and spalling.

Troubleshooting: Abnormal operating noise is often due to roller wear or cage damage, requiring bearing replacement. Abnormal temperature rise is usually due to poor lubrication; check the oil passages and add engine oil. If radial clearance is excessive, replace the bearing and check the journal and housing bore for wear.