CAT 3G-6891 3mm Thick Steering Metering Pump Race

CAT 3G-6891 is a Caterpillar bearing outer ring housing, used for positioning and supporting the outer ring of cylindrical roller bearings. It is suitable for rotating parts such as drive shafts, hubs, and gearboxes of heavy equipment such as bulldozers and loaders, ensuring the fixation and running accuracy of the bearing outer ring. It is a key support component of the transmission system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 3G-6891, Type: Bearing outer ring, Material: High carbon chromium bearing steel (chromium content 1.5%), Surface hardening + low temperature tempering, Hardness HRC60-64, Single weight approximately 0.85 kg, Suitable temperature: -40℃ to +150℃, Mounting method: Press fit, Oil groove-less design, Suitable for grease/oil lubrication

Key Dimensions
Inner diameter 193 mm, Outer diameter 240 mm, Width 35 mm, Chamfer 1.5×45°, Radial runout ≤0.02 mm, End face runout ≤0.015 mm, Interference with bearing outer ring 0.03-0.05 mm, Suitable bearing models: CAT 5P-7592, 3F-5754, etc. cylindrical roller bearings

Suitable Machines and Locations
Suitable for Cat D6T One bearing is provided for each bulldozer final drive wheel hub bearing outer ring positioning, 966K loader boom pin bearing seat ring, and 420F2 excavator slewing gearbox output shaft bearing support. These bearings are used for pure radial support and are suitable for speeds ≤2000 rpm and radial loads ≤50 kN.

Performance Parameters: Tensile strength ≥1200 MPa, elastic modulus 208 GPa, impact toughness ≥25 J/cm², wear resistance meets ISO 683-17 standard, allowing for long-term stable operation in harsh conditions such as dust and mud.

Structural and Performance Advantages:

Superior Material: High-carbon chromium bearing steel, quenched and tempered, possesses high hardness, high wear resistance, and good toughness, capable of withstanding radial and impact loads from heavy equipment, extending service life.

Reliable Precision: Precision machining ensures tolerances in inner diameter, outer diameter, and width, minimizing radial and end-face runout, ensuring bearing operational accuracy after installation, and reducing vibration and noise.

Highly adaptable: Standard size compatible with various Caterpillar cylindrical roller bearings. Interference fit design ensures outer ring stability, preventing slippage or displacement during operation.

Suitable for various operating conditions: Surface hardening treatment enhances wear resistance, suitable for complex working conditions in construction machinery, and can operate continuously in dusty, muddy, and other environments.

Installation and maintenance points: Before installation, clean the bearing race and mounting hole, removing burrs and oil stains. Check the bearing race for cracks and deformation. Press it into the bearing hole using cold pressing or hot fitting methods (heating temperature 80-100℃), ensuring the bearing race end face fits snugly against the mounting surface without looseness.

Maintenance every 2000 hours: Check the clearance between the bearing race and the bearing outer ring. If the clearance exceeds 0.1 mm or if surface wear or pitting is observed, replace the bearing immediately to prevent abnormal bearing operation and equipment failure.

Prioritize original equipment manufacturer (OEM) parts. Aftermarket parts may have insufficient material strength or dimensional deviations, easily leading to insufficient precision after installation and affecting equipment operational stability.