CAT 231-4088 BEARING

CAT 231-4088 is a Caterpillar genuine double-row tapered roller bearing, suitable for the drive axle differential or gearbox output shaft of wheel loaders, excavators, and other equipment. It is used to withstand high radial and bidirectional axial combined loads, ensuring stable operation of the transmission system. It is a key wear component of heavy-duty transmission parts (Cat®…).

Core Technical Parameters

Item Details
Part Model CAT 231-4088 Double Row Tapered Roller Bearing (including inner ring, outer ring, tapered rollers, cage, and seal)

Material: Inner/outer rings are high-carbon chromium bearing steel (GCr15SiMn), surface hardened to HRC 60-64; rollers are bearing steel; cage is stamped steel/brass; seal is nitrile rubber, wear-resistant and impact-resistant, suitable for heavy-duty applications.

Key Dimensions: Inner diameter approx. 120-125mm, outer diameter approx. 210-215mm, width approx. 70-75mm, weight approx. 5.8kg (12.8 lbs), cone angle 12-15°, suitable for differential housing and half-shaft interference fit.

Compatible Models: Loader 950M/966K, Excavator 320D2/336D2, Grader 140M Used for supporting drive axle differentials, gearbox output shafts, and wheel-side reducer input shafts.

Performance Characteristics: Double-row tapered roller bearings can simultaneously withstand radial and bidirectional axial loads, with a load-bearing capacity 40%-60% higher than single-row bearings; cage-separated rollers reduce friction, suitable for low to medium speeds (≤3000rpm), providing strong sealing protection, and suitable for harsh working conditions in construction machinery.

Core Functions and Structure:

Complex Load Bearing: The double-row tapered roller design can simultaneously withstand radial and bidirectional axial forces under heavy loads, suitable for complex stress scenarios in drive axle differentials, wheel-side reducers, and other components, preventing shaft displacement and ensuring transmission accuracy.

Bidirectional Positioning: The inner ring has an interference fit with the shaft, while the outer ring has a clearance fit with the bearing housing, providing bidirectional axial positioning of the shaft, suppressing shaft movement, reducing gear meshing impact, and extending the life of transmission components.

Sealing Protection: Integrated contact-type nitrile rubber seals effectively prevent dust, mud, and moisture from entering, preventing grease leakage, suitable for harsh outdoor working conditions in construction machinery, and reducing maintenance frequency.

Stable Transmission: The cage guides the rollers to roll in an orderly manner, reducing friction and collision between rollers, lowering operating noise and heat generation, suitable for continuous operation at low and medium speeds, and improving transmission efficiency and stability.

Installation and Maintenance Points
Installation Specifications: Clean the journal, bearing housing, and bearing assembly. Check the journal diameter, roundness, and surface roughness (Ra≤0.8μm) to ensure compliance with fitting requirements. Bearings must be cold-pressed using specialized tools. Do not strike the inner or outer rings to avoid component deformation or roller jamming.

Adjust Bearing Preload: After installation, control the preload by adjusting the nut to ensure smooth and unobstructed bearing operation. Axial clearance should be controlled between 0.02-0.05mm to prevent excessive clearance from causing impact wear or insufficient clearance from causing overheating.

Tighten the bearing end cap to the specified torque to ensure reliable sealing and prevent grease leakage and impurity intrusion.

Maintenance Recommendations:

Every 1500-2000 operating hours, check the bearings for abnormal noise and overheating; verify the drive axle oil temperature is normal; after disassembly, inspect the rollers and raceways for pitting and peeling; replace if the clearance exceeds 0.15mm.

Regularly change the drive axle gear oil to keep it clean and prevent impurities from entering the bearings, causing wear on the raceways and rollers and leading to premature failure.