CAT 458-9958 BEARING-NEED

CAT 458-9958 is a Caterpillar genuine full complement needle roller bearing (without cage), suitable for the output shaft of the swing motor of Cat 305.5E2/306E2 excavators and the second shaft end of the gearbox of 908H loaders. It is used to bear heavy radial loads and is suitable for compact installations with limited space. 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: 458-9958; Type: Full complement needle roller bearing (no cage, needles fully covered); Material: Needle rollers are made of chromium-molybdenum alloy steel (integral quenching, hardness HRC 62-66); Inner/Outer ring: Bearing steel (GCr15, quenching hardness HRC 60-64); Weight: 0.42 kg; Operating temperature: -40℃ to +120℃; Rated service life: ≥15000 hours; Lubrication method: Grease lubrication (recommended Cat DEO-ULS No. 2 lithium-based grease); Sealing type: No seal ring (relies on cavity sealing); Protection rating: IP54; Compatible journal diameter: φ35 mm; Compatible bore diameter: φ47 mm

Key Dimensions
Inner diameter: 35 mm (tolerance 0/-0.012 mm); Outer diameter: 47 mm (tolerance 0/-0.018 mm); Width: 28 mm (tolerance ±0.10 mm); Number of needle rollers: 24 needle rollers, needle roller diameter 6 mm, needle roller length 26 mm, inner ring wall thickness 3 mm, outer ring wall thickness 4 mm, inner ring raceway surface roughness Ra≤0.4 μm, outer ring raceway surface roughness Ra≤0.4 μm

Performance Parameters: Radial rated dynamic load 68 kN, radial rated static load 105 kN, limiting speed grease lubrication 3000 rpm (≤500 rpm without lubrication), coefficient of friction ≤0.003, elastic modulus 207 GPa, Poisson’s ratio 0.3, coefficient of thermal expansion 11.5×10^-6/℃, salt spray resistance ≥72 hours, impact toughness ≥22 J/cm², radial clearance 0.015-0.035 mm

Structural and Performance Advantages: Full complement needle roller structure: The cageless design maximizes the number of needle rollers, increasing radial load capacity by approximately 40% compared to caged needle roller bearings, suitable for heavy radial load applications such as rotary motors and gearboxes.

Material and Heat Treatment: The needle rollers are integrally quenched, and the inner/outer rings are made of bearing steel with quenching, resulting in a wear-resistant surface and a strong core, capable of withstanding frequent start-stop cycles and impact loads, reducing the risk of needle roller bending and breakage.

Compact Size Design: The small radial profile allows for fitting into space-constrained shaft ends/cavities, requiring no additional installation space and simplifying the assembly process.

High-Precision Fit: High-precision machining of the inner/outer ring raceways ensures uniform contact of the needle rollers, reducing localized stress concentration and improving operational stability and service life.

Installation and Maintenance Points (Original Data)

Installation: Clean the journal and bearing housing bore (free of burrs/oil). Apply an interference fit to the inner ring (cold fitting recommended, pressing force ≤15 kN). Apply a clearance fit to the outer ring. After installation, check the radial clearance with a feeler gauge (0.015-0.035 mm). Tighten the nuts to a torque of 80-90 N·m. Do not strike the needle rollers or raceways to avoid displacement or damage.

Maintenance: Check bearing temperature every 500 hours (≤80℃ is normal), replenish grease every 1200 hours (1/4 of the bearing cavity volume), replace bearing every 15000 hours, avoid overload operation (≤110% of rated load), and prevent high-speed idling (≥120% of the limiting speed).

Troubleshooting: Overheating is often caused by insufficient lubrication or improper clearance; replenish grease and adjust the clearance. Abnormal noise is often caused by worn or broken needle rollers or foreign objects entering the bearing; replace the bearing. Excessive radial runout is often caused by worn raceways; replace the bearing.