Description
CAT 506-0675 BEARING-BALL
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The CAT 506-0675 is a single-row deep groove ball bearing designed by Caterpillar for the input shaft of hydraulic pumps/transmissions. It is suitable for the hydraulic or transmission systems of medium-duty excavators and loaders, and is used for radial support and positioning of high-speed rotating shafts. It combines low friction and high reliability and is suitable for medium- and high-speed light-load conditions. The following is structured technical and application information:
Core Technical Parameters
Item Details
Basic Attributes
Model 506-0675, Type: Single-row deep groove ball bearing, Material: High-carbon chromium bearing steel (100Cr6), Integral quenching + low-temperature tempering (HRC60-64), Single weight: Approximately 0.48 kg, Applicable temperature: -30℃ to +120℃, Recommended lubrication: Cat MTO 10W-30, Sealing type: Double-sided metal dust cover, Clearance grade: C3
Key Dimensions
Inner diameter: 45 mm (tolerance H7), Outer diameter: 85 mm (tolerance G6), Width: 20 mm (tolerance ±0.10 mm), Chamfer: 1.5 mm × 45°, Ball diameter: 8.7 mm (13 balls, chromium steel), Cage: Stamped steel plate, Mounting clearance: 0.015-0.030 mm
Compatible Models and Applications
Compatible with Cat 320D2, 323D2 Excavator, 950M/966M loader, for hydraulic pump input shaft/gearbox dual-shaft support. Matching parts include bearing housing, lock nut, and sealing ring. Suitable for speeds ≤3600 r/min, rated radial load ≥28 kN, rated axial load ≥8.5 kN.
Performance Parameters: Rated dynamic load 31.5 kN, rated static load 18.2 kN, limiting speed (grease lubrication) 6500 r/min, fatigue life ≥15000 hours, coefficient of friction ≤0.0018, waterproof and dustproof rating IP54.
Structural and Performance Advantages:
High-speed adaptability: Deep groove ball joint structure + stamped steel plate cage, suitable for medium and high-speed rotational conditions. Limiting speed under grease lubrication reaches 6500 r/min, meeting the speed requirements of the hydraulic pump/gearbox input shaft.
Dustproof seal: Double-sided metal dust cover design effectively blocks impurities in hydraulic oil and external dust, suitable for high-pressure and oil-contaminated hydraulic systems, extending grease life.
Precise Positioning: The inner diameter H7 tolerance is an interference fit with the shaft, and the outer diameter G6 tolerance is a clearance fit with the bearing housing. Radial runout ≤0.02 mm ensures the rotational accuracy of the shaft system.
High Load Capacity: Rated dynamic load 31.5 kN, rated static load 18.2 kN, capable of withstanding instantaneous impact loads in hydraulic systems, suitable for frequent start-stop and load-changing conditions.
Installation and Maintenance Points: Before installation, clean the shaft and bearing inner bore, checking for burrs and deformation; use cold fitting or press fitting (pressure ≤8 kN, applied to the inner ring), and do not strike the outer ring; after installation, axial movement ≤0.05 mm, and rotation without jamming.
Trial run for 30 minutes, bearing temperature ≤75℃, no abnormal noise or vibration; check the sealing condition every 500 hours, replenish grease every 1000 hours (1/3 of the bearing cavity volume), and replace the bearing when the outer ring wear exceeds 0.12 mm.
When replacing, the original shaft and bearing housing specifications must be matched to avoid non-standard dimensions that may lead to poor fit and premature failure.
