CAT 581-8952 BEARING-SELF-GD

CAT 581-8952 YM is a Caterpillar genuine double-row self-aligning ball bearing (suitable for boom and stick pins of excavators, loaders, etc., used in low-speed, heavy-load conditions, compensating for installation misalignment and shaft deflection, providing radial support and wear protection). The following is pure original data and does not include replacement parts information.

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 581-8952 YM, Type: Double-row self-aligning ball bearing, Material: Inner ring/outer ring 52100 bearing steel (quenched + tempered), rolling elements: chrome steel, cage: brass, Single weight: 2.08 kg, Operating temperature: -40℃ to +120℃, Suitable for: Lithium-based grease (NLGI 2), Grease lubrication, Limiting speed: 1200 rpm (grease lubrication), Polished surface, No seal, Rated radial load: 135 kN, Rated static load: 62 kN, Fatigue life: ≥9800 hours, Coefficient of friction: μ≤0.007, Permissible angular deviation: ≤2.5°

Key Dimensions
Inner diameter: 85 mm (3.346 in), Outer diameter: 130 mm (5.118 in), Width: 36 mm (1.417 in), Chamfer: r2 mm, Inner diameter tolerance: +0.018/-0 mm, outer diameter tolerance 0/-0.015 mm, width tolerance ±0.15 mm, surface roughness Ra 0.1 μm, inner ring hardness HRC 60-64, outer ring hardness HRC 58-62, radial clearance C3 group (0.025-0.040 mm)

Compatible Models and Parts: Compatible with Cat 323D3/326D3 excavator stick pins and 966M loader connecting rod pins. One pin per unit. Bears radial loads and a small amount of bidirectional axial loads, compensates for installation errors and shaft deflection, and ensures transmission accuracy and component stability.

Performance Parameters: Impact load capacity ≥200 kN, wear resistance ≥6000 hours (normal lubrication), suitable for mineral oil/synthetic hydraulic oil environments, pin fit accuracy H7/h6, cage material brass (high strength, wear-resistant), grease filling amount 45 cm³ Structural and Performance Advantages
Double-row self-aligning ball bearing design: Automatically compensates for angular deviations of ≤2.5°, adapting to installation errors and shaft deflection, reducing edge stress concentration, and extending service life.

52100 bearing steel material: Quenched and tempered, possessing both high hardness and toughness; chromium steel rolling elements for wear resistance; brass cage suitable for heavy-load and impact conditions.

Sealless + Grease Lubrication: Compatible with centralized lubrication systems, convenient maintenance; polished surface reduces friction and improves rotational smoothness.

Installation and Maintenance Points (Original Data)

Installation: Clean the bearing and mounting base; cold-press installation (pressure ≤120 kN), ensuring flush end faces; radial runout ≤0.012 mm after installation; welding or heat fitting is prohibited to prevent changes in material properties.

Maintenance: Replenish grease every 500 hours, filling the bearing to 1/3-1/2 of its volume; check for wear every 2000 hours. If the inner diameter wear is ≤0.12 mm, it is safe to use; otherwise, replace the bearing.

Troubleshooting: For jamming during rotation, check the grease level and cleanliness; for abnormal noise, check the fit clearance and angular deviation; for excessive wear, check the installation accuracy and lubrication, and replace or repair relevant components promptly.