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Stihl String Trimmer Head Won't Spin

FS 45

The part(s) or condition(s) listed below for the symptom String trimmer head won't spin are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for String trimmer head won't spin

Cause 1Trimmer Head

If the threads on the drive shaft are stripped, the trimmer head will not stay on the shaft. If this happens, replace both the trimmer head and the drive shaft.

Trimmer Head for your StihlString Trimmer
Trimmer Head - Part # 1657211 Mfg Part # 385-645

Trimmer head adapter kit (st)

Other Common String Trimmer Repairs

  1. String trimmer string line won't feed