![]() ![]() While the exact method for properly replacing trimmer line can differ depending on which string trimmer model you’re using, the following will offer some general guidance on how to correctly install the line: Now let’s learn how to install the trimmer line. The better choice is to purchase a replacement trimmer line and, depending on the model, re-spool that line onto the spool located inside the trimmer head or insert the short trimmer line pieces into the eyelets in the head. You could simply replace the entire head with one already pre-loaded with line, but that’s not very economical. If too much line extends out of the trimmer head, a blade located on the guard will trim the line as the head rotates.Įventually, the trimmer head is going to run out of line. Most wound trimmer heads have a bumper, or bump knob, that can be tapped on the ground to feed additional line out of the head as the line is worn down, although newer models have an “auto-feed” feature. The trimmer line may be wound around a spool, or the line may be cut into small individual strips that are loaded into the head. ![]() The size and thickness of the trimmer line vary depending on the trimmer model, but the most common diameters for residential use range from 65/100 th of an inch to 95/100 th of an inch. This causes the clutch flyweights to extend outward and engage the drive shaft which rotates the trimmer head.Īs the trimmer head rotates, the trimmer line spreads out and whips around fast enough to cleanly cut through grass, weeds, or low foliage. When the trigger is pulled, a cable opens the throttle on the carburetor which accelerates the engine. When the engine runs at idle speed, the clutch prevents the driveshaft from rotating. To do this, the crankshaft of the string trimmer engine extends out the side of the crankcase and connects to a centrifugal clutch which engages with the drive shaft attached to the trimmer head. How does string trimmer line work anyway?įor the trimmer line to get the job done, the trimmer head needs to be able to spin freely. ![]()
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