White Outdoor String trimmer head won't stop spinning: Common Causes & How to Fix

Repair Instructions:

The clutch connects to drive shafts that attach to the trimmer head. If the clutch is worn out, it can't engage the shafts to spin the head. You might be able to clean and fix the clutch assembly. But since swapping the clutch is pretty easy and cheap, replacing it may be better. The clutch has to engage the drive shafts for cutting. Check if the clutch seems excessively worn or is visibly damaged. If the clutch can't engage properly anymore, consider replacing the whole piece. Installing a brand new clutch ensures solid shaft engagement to rotate the trimmer head. A worn clutch that won't engage the drive shafts will stop cutting from happening.

How to Replace String Trimmer Clutch

1. Disconnect spark plug wire from spark plug to prevent accidental starting.
2. Remove clutch cover to access the clutch assembly. May require trimmer head removal.
3. Mark current clutch orientation before disassembly. This will help during reinstallation.
4. Remove clutch mounting bolt using appropriate sized wrench or socket.
5. Remove clutch assembly from the trimmer shaft. Be careful not to lose parts.
6. Clean trimmer shaft and clutch area using compressed air or rag to remove debris.
7. Install new clutch on shaft oriented the same as the old clutch.
8. Replace clutch mounting bolt and tighten per manufacturer's specs. Do not overtighten.
9. Reinstall trimmer head and ensure proper alignment with clutch.
10. Replace clutch cover and any parts removed for access.
11. Reconnect spark plug wire to spark plug when complete.
12. Start trimmer and test operation to verify smooth clutch engagement.