CAT 320-7313 BEARING

CAT 320-7313 is a Caterpillar single-row radial ball bearing, primarily used in the transmission and hydraulic systems of equipment such as excavators and loaders. It bears radial loads and assists in axial positioning, is suitable for high-speed rotation conditions, ensures stable operation of components, and is a key support component in power transmission. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 320-7313, Type: Single-row deep groove ball bearing (open, no seal), Material: 100Cr6 high-carbon chromium bearing steel (quenched + tempered, hardness HRC60-64), Weight: Approx. 0.85 kg, Suitable Temperature: -40℃ to +120℃, Surface Treatment: None (relies on lubrication for rust prevention), Mounting Method: Interference fit + shoulder positioning

Key Dimensions
Inner Diameter: 60 mm (Tolerance P6, 60.000-60.013 mm), Outer Diameter: 110 mm (Tolerance P6, 109.985-110.000 mm), Width: 22 mm (Tolerance ±0.1 mm), Chamfer: 1.5×45°, Radial Clearance: C3 group (0.015-0.035 mm), Suitable Shaft Diameter: 60 mm (Tolerance…) K6), bearing housing bore diameter 110 mm (tolerance J7)

Compatible Models and Parts: Compatible with Cat 320D/323D excavator boom cylinder connecting rod bearing, 950GC loader gearbox input shaft support, and D6K bulldozer hydraulic pump drive shaft bearing. One piece per shaft, used to bear pure radial loads or a small amount of bidirectional axial loads. Suitable for speeds ≤3000 rpm.

Performance Parameters: Basic rated dynamic load Cr 58 kN, basic rated static load Cor 38 kN, limiting speed (grease lubrication) 4500 rpm, (oil lubrication) 5600 rpm, fatigue life ≥20000 hours (under rated load). Suitable for mineral oil, synthetic grease, and other lubricating media. Can work stably under vibration conditions.

Structural and Performance Advantages:
High load-bearing precision: 100Cr6 bearing steel undergoes precision heat treatment, with rolling elements and raceways achieving P6 precision, ensuring smooth operation at high speeds and reducing vibration and noise.

Radial Clearance Adaptability: The C3 group radial clearance design adapts to thermal expansion and contraction caused by temperature changes in operating conditions, preventing jamming while ensuring rotational flexibility.

Versatile and Reliable Structure: The mature structure of deep groove ball bearings adapts to various installation scenarios, requiring no complex positioning structures, making installation and maintenance convenient and highly versatile.

Long Life Design: Strict material and heat treatment control, combined with optimized raceway curvature, effectively disperses stress, extends bearing life, and reduces maintenance costs.

Installation and Maintenance Points: Before installation, clean the shaft and bearing housing bore to remove oil and impurities, and check for rust and rolling element sticking. Use hot mounting (oil temperature 80-90℃) or cold pressing method to ensure the bearing end face fits snugly against the shaft shoulder without misalignment. After installation, the radial clearance meets the C3 group requirements.

Lubrication Adaptability: For grease lubrication, use lithium-based grease (such as Cat DEO-ULS), filling to 1/3-1/2 of the bearing’s internal space; for oil lubrication, ensure the oil level reaches the center of the lowest rolling element, and change the lubricating oil regularly to prevent contamination.

Maintenance every 2000 hours: Check bearing temperature (≤80℃) and vibration level (≤0.5 mm/s). If abnormal noise, temperature rise, or excessive clearance occurs, replace the bearing immediately to prevent damage.

Prioritize original equipment manufacturer (OEM) parts. Aftermarket parts may have insufficient material purity or dimensional inaccuracies, easily leading to premature wear, seizure, and other malfunctions.