CAT 471-5921 BEARING-ROLL

CAT 471-5921 is a Caterpillar genuine single-row cylindrical roller bearing, suitable for gearboxes, drive axles, or hydraulic pumps/motors in mini excavators and loaders. It features high radial load capacity and shock resistance, making it suitable for medium-to-low speed heavy-duty applications. The following is core information about Cat®…

Core Technical Parameters

Item Details
Part Model: CAT 471-5921 (Single Row NU Type, Separable Outer Ring, Stamped Steel Cage, No Seal)

Material: Inner/outer ring and rollers are made of 52100 bearing steel, integrally hardened (HRC 60-64), hardened layer depth ≥ 1.2 mm; suitable for -40℃ to +120℃ operating conditions, compatible with oil/grease lubrication

Key Dimensions: Inner diameter 45 mm (1.772 in), outer diameter 85 mm (3.346 in), width 19 mm (0.748 in), chamfer 1.0 mm, roller diameter 7.5 mm, number of rollers 12

Single Weight: Approx. 0.38 kg (0.838 lbs)

Tolerances and Fits: Inner diameter tolerance m6 (+0.012/+0.002 mm), outer diameter tolerance… G6 (+0.010/-0.005 mm), radial clearance C3, rotational accuracy P0
Load capacity: Radial rated dynamic load 42 kN, radial rated static load 40 kN, limiting speed 6500 rpm (oil lubrication) / 4800 rpm (grease lubrication)
Structure and core functions:
High radial load capacity: Line contact design, large contact area, suitable for heavy-duty parts such as gearbox output shaft and drive axle differential, strong resistance to impact and vibration.

Axial compensation: NU type outer ring without flanges, allowing axial displacement of the shaft relative to the bearing housing ±0.2-0.5 mm, suitable for shaft thermal expansion and contraction caused by temperature differences in operating conditions.

Easy assembly: The outer ring is separable, allowing separate installation of the inner ring (hot mounting) and outer ring (cold mounting), suitable for batch maintenance, reducing assembly time.

Stable and wear-resistant: 52100 bearing steel + integral quenching, combined with a stamped steel cage, evenly distributed rollers, reducing friction and wear, suitable for continuous operation conditions. Compatible Models and Application Scenarios

Compatible Equipment: CAT 305.5E2/306E2 mini excavators, 906M/907M loaders, 420F2 backhoe loaders, hydraulic pumps for C4.4 engines.

Core Applications: Used for gearbox input/output shaft support, drive axle main reducer bearings, hydraulic pump drive shaft bearings, and travel motor reduction mechanisms. Suitable for low-to-medium speed (≤3000 rpm) and radial heavy load (≤35 kN) conditions.

Installation and Maintenance Points

Installation: Clean the journal and bearing housing bore, ensuring no burrs or oil contamination. The inner ring and shaft use an interference fit (0.015-0.025 mm), which can be heat-fitted to 80-100℃. Direct impact is prohibited.

The outer ring and bearing housing use a clearance fit (0.010-0.020 mm). After press-fitting, the coaxiality should be ≤ 0.05 mm.

Maintenance

Lubrication: Use CAT HYDO 10 hydraulic oil for oil lubrication and NLGI Grade 2 lithium-based grease for grease lubrication. Add grease/change oil every 500-800 hours, ensuring the oil level reaches the center of the bearing.

Inspection: Regularly monitor vibration and temperature. Stop the machine and inspect if the vibration speed exceeds 4.5 mm/s or the temperature exceeds 80℃. Replace the bearing immediately if the clearance exceeds 0.15 mm.