{"product_id":"99944200907b-trimmer-head","title":"99944200907B Speed-Feed 400 Trimmer Head - Fits Echo SRM Series \u0026 Straight Shaft Trimmers (SRM-225, SRM-220, SRM-230","description":"\u003ch2\u003e99944200907B Trimmer Head\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePatented \"Speed-Feed\" Reloading:\u003c\/strong\u003e Engineered for maximum efficiency, this head allows you to reload the entire spool in under 30 seconds without disassembling the housing or using any tools.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCommercial-Grade Bump Advance:\u003c\/strong\u003e Features a high-response 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\u003eSplit-Spool Internal Divider:\u003c\/strong\u003e Designed with a specialized internal wall that keeps the two line segments separate, preventing line \"welding\" and overlapping that causes feeding failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReinforced Alloy Eyelets:\u003c\/strong\u003e Equipped with heavy-duty metal line exits that resist friction-induced heat, ensuring the line remains flexible and doesn't snap at the head during thick brush clearing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Straight-Shaft Balance:\u003c\/strong\u003e Specifically balanced to reduce vibration across a wide range of engine displacements, protecting your gear head bearings and reducing hand fatigue.\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\"\u003e99944200907B\u003c\/li\u003e\n\u003cli\u003e99944200907\u003c\/li\u003e\n\u003cli\u003e99944200908\u003c\/li\u003e\n\u003cli\u003eX047000800\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis \"400\" series head is the primary replacement 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 Entry Series:\u003c\/strong\u003e SRM-210, SRM-220, SRM-225, SRM-225i, SRM-230, SRM-231.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEcho Professional Series:\u003c\/strong\u003e SRM-265, SRM-266, SRM-266T, SRM-280.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEcho High-Torque \u0026amp; New Models:\u003c\/strong\u003e SRM-2320T, SRM-2620, SRM-2620T, SRM-3020.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTechnical Specification:\u003c\/strong\u003e Fits all straight-shaft models utilizing the \u003cstrong\u003eM10 x 1.25 LHF\u003c\/strong\u003e (Left Hand Female) arbor thread.\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 Bump Cap:\u003c\/strong\u003e The center knob has ground down from pavement contact to the point where the internal spring is visible or the line release no longer functions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCracked Housing:\u003c\/strong\u003e Visible stress fractures or missing chunks of the black outer shell, which can cause the head to shatter at high RPMs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEyelet Failure:\u003c\/strong\u003e The metal eyelets have fallen out or are deeply grooved, causing the trimmer line to snap off inside the head repeatedly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoading Mechanism Jam:\u003c\/strong\u003e The internal indexing mechanism is seized with dried sap and debris, preventing the arrows from aligning for a reload.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcessive Vibration:\u003c\/strong\u003e The head has become unbalanced due to uneven wear, putting unnecessary stress on the trimmer's gear head and drive shaft.\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 Remember, this head is \u003cstrong\u003eLeft-Hand Threaded\u003c\/strong\u003e. To tighten it onto the trimmer, you must turn it \u003cstrong\u003eCounter-Clockwise\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLock the Gear Head:\u003c\/strong\u003e Use a small screwdriver or the factory locking pin to hold the gear head shaft stationary while you spin the old head off and the new one on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlignment for Reloading:\u003c\/strong\u003e To reload, rotate the top knob until the arrows on the knob align perfectly with the metal eyelets. Push your line through until it is even on both sides, then twist the knob to wind.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoak Your Line:\u003c\/strong\u003e To extend the life of your trimmer line, soak the spool in water for 24 hours. This keeps the nylon hydrated, making it more flexible and resistant to snapping at the eyelet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean the Spring:\u003c\/strong\u003e Every time you reload the line, shake out any dirt or grass trapped around the internal spring to ensure the \"bump\" action stays smooth and responsive.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":45371210039485,"sku":"AZ00207697","price":12.87,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00207697_1_b911a94c-b85b-48bc-966f-bb07fae77d3c.jpg?v=1762246292","url":"https:\/\/bluestarspartstrend.com\/products\/99944200907b-trimmer-head","provider":"BlueStars Parts","version":"1.0","type":"link"}