CAT 6R-1554 Angular Contact Spherical Plain Bearing

The CAT 6R-1554 is a Caterpillar single-row angular contact self-aligning ball bearing, suitable for shaft ends/gearboxes and other parts of engineering machinery transmission systems. It can withstand radial and unidirectional axial loads simultaneously, eliminate off-center stress, and is suitable for medium-speed (≤3600 r/min) and medium-load conditions, ensuring stable rotation of components and extending their service life. The following is structured technical and application information:

Core Technical Parameters
Item Details
Basic Attributes
Model 6R-1554, type single-row angular contact self-aligning ball bearing, material is high carbon chromium bearing steel (52100, quenching hardness HRC 60-64), cage is stamped steel plate, single weight approximately 0.85 kg, operating temperature -30℃ to +120℃, lubrication method is oil lubrication/grease lubrication, design life ≥12000 hours (normal operating conditions), contact angle 25°, suitable for medium load and medium speed (≤3600 r/min) operating conditions, allowable shaft misalignment ≤2°

Key Dimensions
Inner diameter 44.45 mm (1.75 in, tolerance 0/+0.008 mm), outer diameter 71.438 mm (2.8125 in, tolerance 0/-0.012 mm), total width 27.178 mm (1.07 in, tolerance… 0/-0.12 mm), mounting chamfer r1.5 mm, radial clearance 0.015-0.025 mm (cold state), interference fit (bearing housing bore interference with outer diameter 0.015-0.025 mm), journal clearance with inner diameter 0.01-0.018 mm.
Compatible Models and Parts: Compatible with the slewing mechanism and gearbox input shaft of Cat 320D2 and 323D2 excavators, 950H and 966K loaders, etc. Matching 103-8329 elastic retaining ring and 5P-0960 extreme pressure lithium-based grease. Can be used in pairs with 6R-1555 bearings.
Performance Parameters: Basic rated dynamic load 42 kN, basic rated static load 28 kN, allowable radial load ≥30 kN, allowable axial load ≥12 kN. kN, coefficient of friction ≤0.002 (oil lubrication), impact load ≥8 kN, recommended grease filling amount 1.0-1.5 g/cm³, limiting speed ≤4500 r/min (oil lubrication), ≤3000 r/min (grease lubrication)

Structural and Performance Advantages: Single-row angular contact self-aligning design, inner ring convex surface, outer ring concave surface structure, can eliminate stress caused by shaft misalignment, suitable for the off-center load conditions of engineering machinery transmission systems, and reduce component wear.

High carbon chromium bearing steel material and precise dimensional tolerances ensure stable fit with shaft and bearing housing, effectively absorb vibration, reduce operating noise, and meet medium-speed rotation requirements.

Suitable for multiple lubrication methods, maintaining stable load-bearing and rotational performance under frequent start-stop and vibration conditions, improving the reliability of the transmission system.

Installation and Maintenance Points:

Before installation, clean the bearing, shaft, and bearing housing bore, checking for burrs, rust, or cage damage. Use a dedicated press-fit tool for installation; avoid hammering to prevent damage to the rolling elements and raceways. When installing in pairs, arrange them back-to-back or face-to-face to ensure even preload.

After installation, add appropriate grease to ensure sufficient lubrication. Install the elastic retaining ring to secure the bearing and prevent axial movement. Before operation, perform a no-load test run to check for abnormal noises or jamming, ensuring smooth rotation.

Maintenance: Check lubrication and bearing wear every 1000 hours. If excessive clearance, abnormal noises, or abnormal temperature are found, repair immediately. When replacing bearings, if the journal wear exceeds 0.04 mm, the shaft must also be replaced. Do not mix bearings of different models.