CAT 581-7508 BEARING-RACE-GD

CAT 581-7508 GD is a Caterpillar genuine tapered roller bearing outer ring (GD is a surface treatment designation), suitable for heavy-duty drive systems to withstand combined radial and unidirectional axial loads. The following is pure raw data and does not include replacement parts information for Cat®…

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 581-7508 GD, Type: Single-row tapered roller bearing outer ring, Material: GCr15SiMn bearing steel, Surface treated with GD (gas carburizing + quenching), Single weight: 1.85 kg, Operating temperature: -40℃ to +120℃, Rated dynamic load: 112 kN, Rated static load: 156 kN, Limiting speed: 3200 rpm (grease lubrication) / 4000 rpm (oil lubrication)

Key Dimensions (Metric / Imperial): Outer ring inner diameter: 100.0 mm (3.937 in), Outer ring outer diameter: 130.0 mm (5.118 in), Outer ring width: 27.0 mm (1.063 in), Raceway cone angle: 12°, Large end face chamfer: 1.5×45°, Small end face chamfer: 1.0×45°, Raceway surface roughness: Ra≤0.08 μm

Performance Parameters: Surface hardness HRC 60-64, core hardness HRC 30-40, carburized layer depth 0.8-1.2 mm, tensile strength ≥1800 MPa, compatible journal diameter 100.0 mm, compatible bearing housing bore diameter 130.0 mm

Structure and Compatibility Characteristics:

Combined Load Compatibility: The tapered roller bearing outer ring design can simultaneously withstand radial and unidirectional axial loads, suitable for the working conditions of heavy transmission components such as gearboxes and drive axles.

GD Surface Strengthening: Gas carburizing + quenching treatment improves the wear resistance and fatigue resistance of the outer ring surface, extending service life, suitable for high-frequency impact and heavy-duty conditions.

Machine Compatibility: Compatible with Caterpillar 980G and 988G loaders, D6R and D8R bulldozers, and the gearbox output shaft and drive axle differential of the 777D mining dump truck, used to support transmission components and transmit loads. Installation and Maintenance Points (Original Data)

Installation: Clean the outer ring raceway and bearing housing bore. The surface roughness of the housing bore should be Ra≤0.32 μm, and the clearance should be 0-0.015 mm, ensuring no scratches or rust.

Use the hot fitting method (temperature 80-100℃). Heat the outer ring and install it into the bearing housing bore. After cooling, check the runout of the outer ring end face; it should be ≤0.02 mm, ensuring no interference with adjacent components.

After installation, mate it with the inner ring and roller assembly, adjusting the axial clearance to 0.05-0.10 mm to ensure normal bearing operation.

Maintenance: Check the wear of the outer ring raceway every 2000 hours. Replace immediately if pitting, spalling, or wear >0.1 mm is observed.

Regularly replenish grease. For grease lubrication, fill to 1/3-1/2 of the bearing cavity volume; for oil lubrication, maintain the oil level at 1/2 the bearing height.