CAT 560-4750 25mm Inner Diameter Cylindrical Roller Bearing

CAT 560-4750 is a Caterpillar direct-sleeve cylindrical roller bearing (connecting rod/pin sleeve bearing) that is compatible with the boom and stick pin joints of small excavators such as Cat 305.5E2 and 306E2. It is used to withstand radial heavy loads and swing impacts, reduce friction and wear between the pin and the boom hole, and ensure the smooth operation of the working device (Cat® Parts). The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 560-4750, Type: Straight-sleeve cylindrical roller bearing (sleeve bearing), Material: High carbon chromium bearing steel (SUJ2), Surface hardening + phosphating treatment, Hardness: HRC60-64, Single weight: Approximately 0.8 kg, Operating temperature: -30℃ to +120℃, Fitting pin diameter: 25 mm, Rated radial load: 80 kN, Limiting speed: 500 rpm, Fatigue life: ≥5000 hours (Cat® Parts)

Key Dimensions
Inner diameter: 25.0 mm (tolerance 0/+0.02 mm), Outer diameter: 40.0 mm (tolerance 0/-0.02 mm), Length: 50.0 mm (tolerance ±0.10 mm), Roller diameter: 4.0 mm, Number of rollers: 18, Cage material: PA66+GF30, Radial clearance: 0.02-0.05 mm, end face perpendicularity ≤0.03 mm
Compatible Models and Applications: Compatible with Cat 305.5E2, 306E2, and 307E2 mini excavators, used for boom and stick connection pins, and stick and bucket connection pins. Matching pin models are 8T-4170 and 8T-4171. Suitable for heavy-duty swinging conditions, bearing alternating loads during excavation.
Performance Parameters: Coefficient of friction ≤0.005, impact load ≥150 kN, salt spray corrosion resistance meets ISO 9227 standard (no rust after 48 hours), grease lubrication (recommended Cat DEO-ULS 15W-40 oil-grease mixture), lubrication cycle 200 hours/time.
Structural and Performance Advantages: High-carbon chromium bearing steel with quenching and phosphating treatment, balancing high hardness and wear resistance, suitable for the harsh working conditions of heavy-duty, dusty, and vibrating excavators, extending the service life of pins and boom holes (Cat®). Parts.

The cylindrical roller structure evenly distributes the load, reducing contact stress and localized wear. Compared to traditional copper bushings, its load-bearing capacity is increased by approximately 30%, making it suitable for frequently oscillating workpieces.

The engineering plastic cage is lightweight and highly resilient, effectively isolating the rollers to prevent friction, reducing operating noise, and possessing excellent self-lubricating properties, reducing lubrication dependence.

Precise dimensional design ensures strong compatibility with original pins and boom holes, requiring no additional adjustments after installation. This guarantees connection accuracy and operational flexibility, improving work efficiency.

Installation and Maintenance Points: Before installation, clean the bearing inner and outer rings, pins, and boom holes, checking for burrs and cracks. Use a cold pressing method to press the bearing into the boom hole, ensuring proper end-face contact. After installation, use a retaining ring to fix the axial position and prevent movement.

After installation, add grease until overflowing. Check that the pin rotates freely without jamming. Run the workpiece unloaded for 5 minutes to confirm there is no abnormal vibration or noise. Avoid heating the bearing with a flame to prevent degradation of material properties.

Maintenance: Check the lubrication status every 200 hours and replenish the grease; check the bearing wear every 1000 hours. If the radial clearance is >0.15 mm or if there is peeling or pitting on the surface, replace it immediately. When replacing, you must use original parts. Do not mix bearings of different specifications to avoid uneven wear of the pin.