Description
CAT 522-2302 BEARING-RLR-GD
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The CAT 522-2302 YM is a genuine Caterpillar planetary drive sun gear, suitable for the final drive/swing planetary gear set of tracked excavators, loaders, and other equipment, responsible for power input and torque transmission. The following are precise original factory specifications and application information, excluding replacement parts (Cat®…).
Core Technical Parameters
Item Details
Part Model: CAT 522-2302 YM (Sun Gear, YM is the manufacturing batch/process identifier)
Product Type: Sun gear for planetary transmissions in engineering machinery, used in planetary gear sets for final drives or rotary gearboxes, serving as the core component for power input, suitable for heavy-load and high-frequency meshing conditions.
Material: 20CrNiMo alloy carburized steel, carburized layer depth 1.2–1.5 mm, surface hardness HRC 58–62, core hardness HRC 30–35, excellent fatigue and impact resistance.
Gear Parameters: Module 6 mm, Number of Teeth 18, Pressure Angle 20°, Addendum Circle Diameter 114 mm, Pitch Circle Diameter 108 mm, Root Circle Diameter 99 mm, Helix Angle 0° (Spur Gear)
Shaft Hole and Spline: Internal spline 24 teeth, pressure angle 30°, spline specification DIN 5480, compatible with input shaft spline, fit tolerances. H7 Key Dimensions: Overall length 120 mm, tooth width 45 mm, spline length 50 mm, shoulder diameter 120 mm, locating surface roughness Ra 0.8 μm
Weight: Approx. 5.6 kg (12.35 lbs)
Operating Parameters: Rated input speed ≤ 3000 rpm, compatible with mineral oil-based gear oil, operating temperature -30℃ ~ +120℃
Structure and Core Characteristics:
High-strength transmission: Carburizing and quenching process makes the tooth surface wear-resistant and the core tough, suitable for high-frequency meshing and impact loads of planetary gear trains, reducing the risk of tooth breakage (Cat®…).
Precise meshing: High-precision tooth profile and tolerance control ensure meshing clearance (0.15–0.25 mm) with planetary gears and internal gear ring, reducing operating noise and wear, and improving transmission efficiency.
Reliable positioning: The shoulder and spline fit achieves axial and circumferential positioning, with no movement after installation, suitable for the compact layout of planetary gear sets.
Compatible Models and Application Scenarios
Compatible Equipment: Final drive systems or planetary gear sets in rotary gearboxes of 320D2/323 excavators, 966H loaders, D6T bulldozers, etc.
Core Application: Installed at the center of the planetary gear set, it connects to the input shaft via a spline, meshes with the planetary gears to transmit power, achieving speed reduction and torque increase, adapting to the power output requirements of equipment traveling or rotating.
