Trimmer Head Won’t Spin? Fix the Gearhead, Shaft & Clutch

A string trimmer is an essential tool for keeping your yard looking neat, but few things are more frustrating than an engine that roars to life only for the cutting head to refuse to spin. This is one of the most common and perplexing issues you’ll encounter on a small engine repair blog.

Don’t assume your trimmer is dead! The problem is often isolated to the drive system. Here is a detailed guide to the primary culprits when your trimmer head won’t spin.