⚙️ Technical Specifications

• Part Number: 7117-34280
• Part Type: Sun Gear
• Stage: 3rd stage (Sun Gear No.3)
• Application: Final drive / travel gearbox

👉 This gear operates in the final stage of the planetary system, contributing to maximum torque output.

🚜 Compatible Machines

Commonly used in:

• Volvo EC210B
• Volvo EC240
• Volvo EC240B

🧩 Function in the System

In a planetary gear system:

• Sun gear (center gear)
• Planet gears (surrounding gears)
• Ring gear (outer gear)

✔ The sun gear rotates
✔ Drives the planet gears
✔ Transfers and multiplies torque to the tracks

👉 As a 3rd stage gear, it provides:

• Maximum torque
• Lowest output speed

⚠️ Failure Symptoms

When this part is worn or damaged:

• Loud gear noise (grinding / knocking)
• Machine struggles to travel or stops
• Sudden locking in the gearbox
• Metal particles in gearbox oil