⚙️ Technical Information

• Part Number: 2104‑1019 / 21041019
• Part Name: Sun Gear (Central Planetary Gear)
• Application:
  • Doosan / Daewoo excavator swing or travel mechanisms
  • Acts as the central gear in the planetary gear system
• Teeth Count: Typically ~22/16 teeth (verify with your part) (yearnparts.com)

🚜 Compatible Machines

Commonly used in:

• Doosan Solar 220LC‑V
• Doosan Solar 220LL
• Doosan Solar 220N‑V
• Doosan Solar 450‑III

Some suppliers also list it for Solar 470 models. (excavatorreplacementparts.sell.everychina.com)

🧩 Function in the Planetary Gear System

Planetary gear systems consist of:

• Sun Gear (central gear)
• Planet Gears (surrounding gears)
• Ring Gear (outer gear) (kureansiklopedi.com)

✔ Sun gear receives input torque
✔ Drives the planet gears
✔ Transfers torque through the system

👉 This setup provides both torque multiplication and speed reduction. (kureansiklopedi.com)

⚠️ Common Failure Symptoms

When the 2104‑1019 sun gear is worn or damaged:

• Loud or abnormal gear noise (grinding, clicking)
• Reduced swing or travel power
• Stiff or difficult gear movement
• Metal debris in hydraulic or gearbox oil