CAT 4L-7332 CUP

CAT 4L-7332 is the outer ring (Cup) of a Caterpillar tapered roller bearing. It is primarily used in the drive axle main reducer and differential tapered roller bearings (such as the 4L-7330 bearing assembly) of CAT 120K/140K graders and 938G loaders, providing radial support and axial positioning for heavy-duty transmission applications. The core information is as follows:

Core Technical Parameters
Item Details
Part Model: CAT 4L-7332 (4L7332) tapered roller bearing outer ring (Cup), compatible with 4L-7330 tapered roller bearing assemblies, used in conjunction with the inner ring (Cone) and roller assembly.

Core Material: Chromium bearing steel (GCr15), integrally quenched + low-temperature tempered (HRC 60–64), raceway surface ultra-precision ground (Ra≤0.08 μm), wear-resistant + fatigue-resistant, suitable for heavy-duty transmission applications.

Key Dimension: Outer Diameter 160 mm inner diameter (raceway diameter) 120 mm, width 40 mm, outer ring raceway half-cone angle 12°, compatible inner ring model 4L-7331, installation tolerance JS7/h6, interference fit with bearing housing (0.01–0.03 mm)

Single weight: Approx. 1.2 kg

Compatible models: CAT 120K/140K graders (drive axle main reducer/differential), 938G/950G loaders (gearbox output shaft bearing), D6N bulldozers (final drive bearing), used in heavy-duty transmission parts, bearing radial + bidirectional axial loads

Operating adaptability: Maximum radial load 180 kN, maximum axial load 80 kN, operating temperature -30℃ to +120℃, compatible with extreme pressure gear oil (API GL-5), fatigue life ≥8000 kN Operating Hours
Core Functions and Structural Features

Conical Raceway Load Bearing: The inner surface tapered raceway makes linear contact with the rollers, allowing simultaneous radial and bidirectional axial loads. Suitable for combined load conditions in drive axles and reducers, with a transmission efficiency ≥98%.

High-Precision Positioning: Interference fit with the bearing housing (0.01–0.03 mm), ensuring no looseness after installation, guaranteeing the coaxiality of the bearing assembly, suppressing eccentric vibration during transmission, and reducing noise (≤85 dB).

Fatigue Resistance and Wear Resistance: GCr15 bearing steel has a contact fatigue strength ≥1800 MPa. Ultra-precision grinding of the raceway reduces friction and wear, suitable for heavy-load, high-frequency transmission conditions, extending the life of the bearing assembly.

Compatibility: Precisely matches the 4L-7331 inner ring and 4L-7330 bearing assembly. After installation, the bearing clearance is controlled within 0.02–0.04 mm, ensuring transmission accuracy and operational stability.

Installation and Maintenance Points

Installation Specifications: Clean the bearing housing bore and outer ring. The surface roughness of the bearing housing bore should be Ra≤1.6 μm, free of burrs and dents. The outer ring raceway should be free of scratches and corrosion.

Assemble the bearing using cold pressing or heating the bearing housing bore (≤100℃). The outer ring end face should be flush with the bearing housing end face, without skewing. The interference fit should be controlled within 0.01–0.03 mm to avoid excessive interference fit that could cause raceway deformation.

After installation, check the bearing clearance to 0.02–0.04 mm. Add extreme pressure gear oil (API GL-5) to ensure adequate lubrication and reduce friction and wear.

Maintenance Recommendations: Every 1000 working hours, check for: outer ring raceway wear (depth > 0.1 mm), surface peeling, and cracks. Replace the bearing immediately if any problems are found. Simultaneously check the wear of the inner ring and roller assembly.

When replacing bearings, prioritize original parts to ensure that the material, dimensional accuracy, and raceway accuracy meet standards. Avoid using ordinary outer rings that could lead to premature bearing failure and damage to transmission components.

Simultaneously check the bearing housing bore deformation (roundness > 0.02 mm requires repair) and gear oil cleanliness. Replace gear oil and filter element if necessary to ensure lubrication effect and reduce the risk of secondary failures.