CAT 587-9139 215.9mm Outer Diameter Special Ball Bearing

CAT 587-9139 is a Caterpillar genuine double-row self-aligning ball bearing with a precise outer diameter of 215.9 mm (8.5 in). It is suitable for heavy-duty rotating parts such as gearboxes, transfer cases, and final drives. The following are raw specifications and do not include information on replacement parts (Cat® Parts).

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes
Model 587-9139, Type: Double row self-aligning ball bearing, Material: High carbon chromium bearing steel (chromium content 1.5% – 1.65%), Single weight: 18.2 kg, Applicable operating conditions: Low speed, heavy load, with some angular misalignment, Operating temperature: -30℃ to +120℃, Rated dynamic load ≥480 kN, Rated static load ≥265 kN, Fitting shaft diameter: φ114.3 mm (4.5 in), Used for final drives in heavy machinery, gearbox output shaft support

Key Dimensions (Metric / Imperial)
Inner diameter: 114.3 mm (4.5 in, tolerance 0/-0.02 mm), Outer diameter: 215.9 mm (8.5 in, tolerance 0/-0.03 mm), Total width: 75.0 mm (2.953 in, tolerance ±0.12 mm), Ball diameter: 18.5 mm, Number of balls: 36. Cage material: phenolic resin; interference fit with mounting hole: 0.04-0.06 mm.

Performance Parameters: Bearing steel hardness: HRC 61-65; ball surface roughness: Ra≤0.2 μm; limiting speed: 1800 rpm (oil lubrication); permissible angular misalignment: ≤2°; compatible with Cat DEO-ULS 15W-40 machine oil or HD EP 2 grease; fatigue life: ≥2.5×10⁶ cycles.

Structure and Compatibility Characteristics:
Double-row self-aligning structure: Double-row steel ball design automatically compensates for angular deviation (≤2°) between the shaft and bearing housing, effectively addressing installation errors and shaft deflection during operation, reducing edge stress, and suitable for heavy-load conditions where coaxiality is difficult to guarantee.

High load compatibility: The phenolic resin cage has high strength and wear resistance, stably guiding the steel balls, and can withstand large radial loads while also withstanding small bidirectional axial loads, making it suitable for final drives in heavy machinery, gearbox output shafts, etc. Operating Condition Adaptability: The bearing steel undergoes quenching treatment, exhibiting excellent fatigue and wear resistance, making it suitable for dusty and impact-prone outdoor environments. The sealing structure effectively prevents impurities from entering, extending service life.

Installation and Maintenance Points (Original Data)

Installation: Clean the journal, mounting hole, and bearing surface, ensuring they are free of oil, rust, and burrs. Use hot mounting (heating temperature 80-100℃) or cold pressing (pressure ≤300 kN). After installation, the bearing end face should be flush with the mounting surface, without skewing. The shaft should rotate freely without jamming. The clearance between the bearing and the journal should be ≤0.015 mm, and the clearance between the bearing and the mounting hole ≤0.02 mm.

Maintenance: Check lubrication and wear every 800 hours, ensuring sufficient oil/grease. Replace the bearing when radial clearance exceeds 0.25 mm. For long-term storage, apply anti-rust oil and seal to prevent bearing corrosion and ball adhesion.