[Lifetime Warranty] 3/8 7T Clutch Drum Sprocket with Bearing3/8 7T Clutch Drum Sprocket with Bearing Washer E-Clip Worm Gear

3/8 7T Clutch Drum Sprocket with Bearing3/8 7T Clutch Drum Sprocket with Bearing Washer E-Clip Worm Gear

Key Features

• Sprocket Pitch: 3/8 inch
• Sprocket Tooth Count: 7
• Material: High-strength metal alloy construction
• Complete assembly kit for chainsaw clutch and oil pump drive
• Includes: 1x Clutch Drum Sprocket, 1x Needle Bearing, 1x Clutch Washer, 1x E-Clip, 1x Worm Gear

Replaces / Cross-Reference Part Numbers

• 1123 640 2003
• 1123-640-2003

Compatibility & Fitment

• Designed for specific Stihl chainsaw models.
• Fits Stihl: 017, 018, 021, 023, 025
• Fits Stihl: MS 170, MS 180, MS 210, MS 230, MS 250
• Note: Always verify part number and model to ensure correct fitment.

When to Replace

• Visible wear, grooving, or damage on the sprocket teeth
• Chain slips, binds, or derails frequently
• Grinding or abnormal noise from the clutch housing
• Chain continues to spin at idle

Installation Tips

• Disconnect spark plug wire before beginning service.
• Use a piston stop tool to prevent engine rotation during clutch removal.
• Clean all components and the clutch housing area before installing new parts.
• Lightly grease the needle bearing before installation.
• Ensure the E-clip is properly and securely seated in its groove.