{"product_id":"2-pcs-99944200903-speedfeed-450-trimmer-head-2pack","title":"99944200903 Speed-Feed 450 Trimmer Head - Fits Echo SRM-266, SRM-266S, SRM-266T, SRM-266U - 2 Pack Ver. 2","description":"\u003ch2\u003e99944200903 Speed-Feed 450 Trimmer Head\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLightning-Fast Reloading:\u003c\/strong\u003e The patented Speed-Feed design allows you to reload the entire head with trimmer line in under 30 seconds without ever disassembling the housing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Capacity Professional Spool:\u003c\/strong\u003e Designed to hold up to 20 feet of 0.095\" diameter line, providing extended run times for commercial landscaping and heavy-duty residential clearing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmooth Bump-Feed Advance:\u003c\/strong\u003e Features a heavy-duty internal spring and balanced centrifugal design for reliable, jam-free line advancement with a light tap on the ground.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility Hardware:\u003c\/strong\u003e Includes multiple arbor adapters (studs and nuts), making it a versatile replacement for most straight-shaft trimmers beyond just Echo models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDebris-Shielded Internal Gears:\u003c\/strong\u003e The internal indexing mechanism is sealed to prevent dirt, sap, and fine grass from entering the head and causing the \"bump\" action to stick.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003e99944200903\u003c\/li\u003e\n\u003cli\u003eX047000940\u003c\/li\u003e\n\u003cli\u003e28820-08000\u003c\/li\u003e\n\u003cli\u003e78890-21001\u003c\/li\u003e\n\u003cli\u003e385-288\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis \"450\" series head is the heavy-duty upgrade for Echo's professional-grade straight-shaft trimmers. Key compatible models include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEcho SRM-266 Series:\u003c\/strong\u003e SRM-266, SRM-266S, SRM-266T (High Torque), SRM-266U (U-Handle).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEcho SRM-280 Series:\u003c\/strong\u003e SRM-280, SRM-280S, SRM-280T, SRM-280U.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEcho High-Capacity Models:\u003c\/strong\u003e SRM-3020, SRM-3020T, SRM-410U.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShindaiwa Models:\u003c\/strong\u003e T260, T261, T270, T272, T282, T344.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Standard fitment is M10 x 1.25 LHF (Left Hand Female). Use the included adapters for other shaft sizes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorn-Through Bottom Cover:\u003c\/strong\u003e The bottom of the head (the bump area) has ground down from contact with pavement or soil, potentially exposing the internal spool.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCracked Outer Shell:\u003c\/strong\u003e Visible stress fractures in the black housing, which can lead to the head shattering or throwing internal parts at high RPM.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLine Won't Load:\u003c\/strong\u003e The internal \"eyelets\" no longer line up or the reloading mechanism is jammed with dried sap and debris.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcessive Vibration:\u003c\/strong\u003e The head has become unbalanced due to uneven wear or missing internal components, leading to potential gear-head failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyelet Failure:\u003c\/strong\u003e The metal line exits have fallen out or are deeply grooved, causing the trimmer line to snap off inside the head repeatedly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLeft-Hand Threads:\u003c\/strong\u003e This head is \u003cstrong\u003eLeft-Hand Threaded\u003c\/strong\u003e. To install, turn the head \u003cstrong\u003eCounter-Clockwise\u003c\/strong\u003e onto the gear head shaft.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Loading Arrow:\u003c\/strong\u003e To reload, rotate the top of the head until the arrows on the knob align with the metal eyelets. Push a single 20ft piece of line through until it comes out the other side evenly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWinding the Line:\u003c\/strong\u003e Once the line is centered, simply twist the top knob. The head will automatically pull the line inside and wind it perfectly on the spool.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGear Head Maintenance:\u003c\/strong\u003e While the head is off, check your gear head for old grass buildup. It is also the perfect time to add \u003cstrong\u003eLithium Grease\u003c\/strong\u003e to the gear-head port to prevent overheating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLocking the Shaft:\u003c\/strong\u003e Use a small hex key or screwdriver to lock the trimmer's gearbox before trying to unscrew your old head. If the old head is stuck, a pair of large channel-lock pliers may be required.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":45860036935869,"sku":"AZ00360156","price":24.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00360156_1_44ed8c0d-8463-496b-9245-e9e58ee4ee02.jpg?v=1762245593","url":"https:\/\/bluestarsparts.com\/products\/2-pcs-99944200903-speedfeed-450-trimmer-head-2pack","provider":"BlueStars Parts","version":"1.0","type":"link"}