CAT 099-0322 Roller Bearing

CAT 099-0322 is a Caterpillar single-row cylindrical roller bearing, suitable for SG04 rotary motors in models such as 312 and 313. It is used to support the motor camshaft or drive shaft, bear radial loads and provide stable rotation guidance, withstand high pressure and vibration conditions, and is a core support component of the rotary motor transmission system. The following is structured technical and application information:

Core Technical Parameters

Item Details
Basic Attributes
Model 099-0322, Type: Single-row cylindrical roller bearing (with cage), Material: Bearing steel (chrome steel), Weight: Approx. 0.42 kg, Applicable Temperature: -40℃ to +120℃, Lubrication Method: Grease lubrication, Installation Method: Interference fit, Matching Seal Model: 099-0321 J (lip seal)

Key Dimensions
Inner Diameter: 45 mm (Tolerance ±0.01 mm), Outer Diameter: 75 mm (Tolerance ±0.01 mm), Width: 20 mm (Tolerance ±0.02 mm), Roller Diameter: 6 mm, Number of Rollers: 18, Cage Material: Nylon, Radial Clearance: C3 (0.012-0.025 mm), Chamfer: 1.5 mm, Surface Roughness: Ra≤0.4 μm

Compatible Models and Applications
Compatible with Cat 312, 313 excavators SG04 The rotary motor, mounted on the motor camshaft support, includes components such as 099-0320 bushings and 7I-0057 springs. It bears radial loads, ensuring smooth shaft rotation, preventing eccentric wear, and improving the transmission efficiency and stability of the rotary motor.

Performance Parameters: Dynamic radial load rating Cr≥65 kN, static radial load rating C0r≥58 kN, limiting speed ≤6000 rpm, coefficient of friction ≤0.002 (grease lubrication), fatigue resistance ≥10^6 cycles, hardness HRC 60-64, corrosion resistance IP65.

Structural and Performance Advantages:
High load capacity and stability: Single-row cylindrical roller design with a large contact area and strong radial load capacity, suitable for high-pressure operating conditions of rotary motors, increasing radial load capacity by approximately 40% compared to ball bearings.

Low friction and high efficiency: Nylon cage guides the rollers to be evenly distributed, reducing friction and wear. The low coefficient of friction under grease lubrication reduces motor energy consumption and improves transmission efficiency.

Precise Positioning: Interference fit installation, C3 radial clearance, adaptable to shaft thermal expansion and contraction, preventing shaft movement during operation and ensuring precise operation of the rotary motor cam mechanism.

High Compatibility: Designed specifically for the SG04 rotary motor, it precisely matches bushings, seals, and other compatible parts, requiring no additional adjustments during installation and facilitating maintenance and replacement.

Installation and Maintenance Points: Before installation, clean the bearing housing and shaft surface, ensuring no burrs or scratches. Heat the bearing to 80-100℃ using liquid nitrogen or a dedicated heater before quick press-fitting, avoiding forceful hammering that could deform the bearing. After press-fitting, check that the radial clearance is within the specified range.

Every 1000 hours, check the bearing for abnormal noises during operation and for leaks at the seals. Replenish grease promptly if necessary. Replace bearings immediately if wear, roller peeling, or cage damage is observed to prevent shaft jamming and rotary motor malfunctions.

Prioritize original equipment manufacturer (OEM) parts. Aftermarket parts may experience premature wear due to insufficient material hardness or roller precision, affecting rotary motor stability and increasing maintenance costs.