⚙️ Technical Description

• Part Number: 7117-34360
• Part Type: Sun Gear (#2 stage)
• System: Final drive / travel gearbox
• Weight: Approx. 6–7 kg

👉 This gear is the second-stage sun gear in the planetary gear system.

🚜 Compatible Machines

Commonly used in:

• Volvo EC240B
• Volvo EC240 / EC240C (depending on configuration)

🧩 Function in the System

In a planetary gearbox:

• 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 2nd stage gear, it plays a key role in torque amplification and speed reduction.

⚠️ Failure Symptoms

When the 7117-34360 sun gear is worn or damaged:

• Abnormal noise (grinding / knocking)
• Weak or jerky travel movement
• Machine may stop intermittently
• Metal particles in gearbox oil