4 reasons why the string trimmer head is not working If too much line extends out of the trimmer head, a blade located on the guard will trim the line as the head spins. Most wound string 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 trimmer head. The size and thickness of trimmer line varies depending on the string 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 spins the trimmer head.Īs the trimmer head spins, the trimmer line spreads out and whips around fast enough to cleanly cut down weeds, tall grass, and light brush along the edges of fences, trees, and other hard-to-reach places. 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 drive shaft from rotating. How does a string trimmer head work? 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. While you’ll want to make sure you’ve properly installed the string trimmer line, that line won’t be of much use unless the trimmer head can spin freely at least 2,700 rpm. How a gas-powered string trimmer head works Repair has the answers for what makes a gas-powered string trimmer head spin and the most likely causes for the head not spinning. However, if you have a broken string trimmer head, that trimmer line won’t have much chance of damaging a marshmallow. String trimmer line effectively cuts through the overgrowth because the trimmer head can spin as fast as 12,000 rpm or nearly 400 miles per hour on gas-powered string trimmers, making this hand-held piece of power equipment an exceptionally versatile addition to your landscaping tool collection. Suddenly, that harmless plastic line is strong enough to rip through grass, weeds, and small foliage. All that changes when the string trimmer’s throttle trigger is pulled and the trimmer head begins to rotate. In fact, there’s no need to wear protective gloves when replacing string trimmer line since the line has no sharp edges. However it’s still much more productive when the trimmer is operated left-handed.Unlike the blade on a lawn mower, the oscillating teeth on a hedge trimmer, or the cutting chain on a chainsaw, the thin pieces of plastic line extending out of a string trimmer’s head don’t seem very threatening. Even experienced operators can “follow the edge”, even if they continue to edge and trim right-handed. This method substantially reduces fatigue.Īnd if you train new operators this way from the beginning, it’s easy. This allows the operator to walk straight ahead (instead of sideways or backwards) with his right shoulder closest to the wall and holding the trimmer across his waist with his arms fully extended. This forces most right handed operators to either twist their upper body toward the wall or walk sideways or backwards while trimming clockwise around a building.Ģ) The more efficient and safer way to trim from right to left is to trim left handed. As a result, when these trimmers are used to trim against a wall, they cut through the grass much more cleanly and efficiently when moved along said wall from right to left. The following are some procedures and observations on what we believe to be the best methods of handling straight shaft trimmers.ġ) Most straight shaft trimmers spin their string counter clockwise.
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