CAT 1U-0210 108mm Spherical Bearing Inner Race

CAT 1U-0210 is a commonly used spherical raceway trunnion bearing by Caterpillar. It is suitable for articulated trunnions and oscillating mechanisms in engineering machinery and agricultural machinery. It is used for radial loads and conditions with certain angular misalignment. It can be used with retaining rings, bushings, etc. It has self-aligning, impact resistance and wear resistance characteristics, and is suitable for dusty and vibrating conditions. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 1U-0210, spherical trunnion bearing, material is carburized alloy steel ring + chrome steel rolling elements + nylon cage, single weight approximately 0.85 kg, operating temperature -20℃ to +120℃, load type is radial load + angular misalignment (≤3°), friction coefficient ≤0.005 (grease lubrication), lubrication method is grease lubrication (recommended Cat 2V-9822 grease), design life ≥10000 hours (normal operating conditions)

Key Dimensions
Inner diameter 50 mm (tolerance 0/-0.015 mm, mating shaft h7 tolerance), outer diameter 75 mm (tolerance +0.012/0 mm, mating seat hole H7 tolerance), width 25 mm (tolerance 0/-0.12 mm), spherical radius R37.5 mm, chamfered ends 1×45°, inner ring cylindricity ≤0.01 mm, outer ring spherical roundness ≤0.01 mm, end face parallelism ≤0.01 mm
Compatible Models and Parts: Compatible with Cat 305E2 excavators (boom trunnions), 904M loaders (steering knuckles), and 420F2 bulldozers (draw racks), with matching 235-9767 retaining ring assembly, 8W-7114 bushing, and 1U-0211 sealing ring.
Rated Load: Radial rated dynamic load Cr=65 kN, radial rated static load Cor=160 kN, allowable linear velocity ≤2.0 m/s (grease lubrication), impact load ≥35 kN, ultimate pressure ≥250 MPa.
Structural and Performance Advantages: The spherical design allows for self-alignment, adapting to ±3° angular misalignment, compensating for installation errors and working deformation, reducing edge stress, and improving bearing life.

The carburized alloy steel ring has a hardness of HRC58-62, the rolling elements are made of high-purity chromium steel, and the cage is made of reinforced nylon. It possesses high load-bearing capacity, impact resistance, and low friction characteristics, making it suitable for dusty and vibrating environments.

Its compact size is suitable for confined installation spaces, facilitating press-fitting. It is used in conjunction with retaining rings and bushings to ensure joint connection accuracy and sealing performance.

Installation and Maintenance Points: Before installation, clean the inner and outer surfaces of the bearing, the shaft, and the housing bore. Check for cracks, rust, and deformation. Measure the dimensions of the housing bore (75 mm, H7 tolerance) and the shaft (50 mm, h7 tolerance) to ensure an interference fit of 0.010-0.025 mm.

Use cold press-fit installation. Apply pressure evenly to the bearing end face using a special press tool. Do not strike the ball surface. After installation, check for smooth rotation, no jamming or abnormal noise, axial movement ≤0.05 mm, and a ball-to-bore fit ≥90%. Maintenance and Replacement: Check wear and lubrication condition every 1000 hours. If the inner diameter wear is >0.2 mm or the spherical surface peels off, replace immediately. It is recommended to replace it at the same time as the shaft and seals to ensure the joint connection accuracy and sealing effect.