125-4403 655 mm OD Track Sprocket
Cat® Track Sprocket for Undercarriage Frames
Description
The undercarriage frame sprocket transfers power from the vehicle's powertrain to the track chain, allowing the vehicle to move. As the sprocket rotates, its teeth mesh with the links of the track chain, driving the chain forward or backward. This rotation creates motion in the track chain, propelling the vehicle in the desired direction. It transmits engine power to the track system and converts rotary motion into linear motion. It ensures efficient power transmission and provides the torque needed for the vehicle to travel over a variety of terrain, including soft soil, rough surfaces, and uneven ground.
Attributes
Ensures compatibility with the intended vehicle.
Withstands strong forces and friction during operation, with excellent durability and wear resistance.
Designed to withstand heavy loads and deliver reliable performance in demanding applications.
Applications
The undercarriage frame sprocket helps tracked vehicles move smoothly and under control. It is primarily used on Cat® 320, 320D, 323D, 325, 325D, 329D, 330D, 336D, 345C, C6.6, and C7.1 OEM applications, and 320, 323, 323F, 325C, 329E, 330, 330D, and 330F Excavators.
Specifications
| Undercarriage System | HD |
|---|---|
| Number of Teeth | 21 |
| Sprocket Pitch Diameter | 644.6 mm |
| Number of Bolts | 24 |
| Noise Reduction Lugs | No |
| Bolt Thread Size | M20 |
| Inside Diameter | 410.12 mm (16.15 in) |
| Backlash | 10 mm (0.394 in) |
| Packing Offset Diameter | 641.6 |
| Tip Diameter | 655 mm (25.787 in) |
| Groove Angle | 62 degrees |
| Pitch Diameter | 646 |
| Tooth Width | 65 mm (2.559 in) |
| Sprocket Mounting Type | Offset |
| Pitch | 190 mm (7.48 in) |
| Bushing Radius | 29.4 mm (1.157 in) |
| Material Type | Plain Steel |
| Bolt Circle Diameter | 455 mm (17.913 in) |
| Pressure Reducing | No |
| Track Shoe Type | Extreme Duty, Single Grouser, Trapezoidal |
| Width | 65 mm (2.56 in) |
| Outside Diameter | 655 mm (25.69 in) |
| Weight | 36.5 kg (80.47 lb) |
| Material | Cast Steel |
Compatible Equipment
- Excavators: 323, 323D L, 329D L, 330D2, 329E, 325D, 345C L








