{"product_id":"pto-clutch-am100979","title":"AM100979 PTO Clutch Replacement for John Deere STX38 Yellow Deck | Replaces AM122969, 5215-35","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eAM100979 PTO clutch replacement\u003c\/strong\u003e is an aftermarket electric PTO clutch for select \u003cstrong\u003eJohn Deere STX38 yellow deck\u003c\/strong\u003e, \u003cstrong\u003eSTX30\u003c\/strong\u003e, and related John Deere lawn tractor applications using the \u003cstrong\u003eAM100979 \/ Warner 5215-35\u003c\/strong\u003e clutch path.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant STX38 fitment warning:\u003c\/strong\u003e This clutch is for select \u003cstrong\u003eJohn Deere STX38 yellow deck\u003c\/strong\u003e applications. It is \u003cstrong\u003enot\u003c\/strong\u003e the correct clutch for STX38 black deck or STX46 black deck models unless your original clutch number matches one of the replacement numbers listed below.\u003c\/p\u003e\n\u003cp\u003eThis clutch replaces \u003cstrong\u003eJohn Deere AM100979\u003c\/strong\u003e, \u003cstrong\u003eAM115090\u003c\/strong\u003e, \u003cstrong\u003eAM118969\u003c\/strong\u003e, and \u003cstrong\u003eAM122969\u003c\/strong\u003e, and cross-references \u003cstrong\u003eWarner 5215-35\u003c\/strong\u003e and \u003cstrong\u003eXtreme X0407\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eBuilt with a \u003cstrong\u003e1-inch crankshaft bore\u003c\/strong\u003e, \u003cstrong\u003e5.50-inch pulley diameter\u003c\/strong\u003e, \u003cstrong\u003ecounter-clockwise rotation\u003c\/strong\u003e, and a \u003cstrong\u003e105 ft-lb torque rating\u003c\/strong\u003e, this clutch is designed to restore reliable mower deck blade engagement when matched to the correct original clutch number, deck color, pulley size, rotation, connector style, and product photos.\u003c\/p\u003e\n\u003cp\u003eIf you are comparing STX deck versions or diagnosing blade engagement problems, see our \u003cstrong\u003e\u003ca href=\"\/blogs\/pto-clutch-guides\/john-deere-stx-pto-clutch-replacement\"\u003eJohn Deere STX PTO clutch replacement guide\u003c\/a\u003e\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAftermarket electric PTO clutch replacement for listed John Deere yellow deck STX applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrankshaft Bore:\u003c\/strong\u003e 1\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulley Diameter:\u003c\/strong\u003e 5.50\" \/ 5-1\/2\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotation:\u003c\/strong\u003e CCW from pulley side\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTorque Rating:\u003c\/strong\u003e 105 ft-lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Width:\u003c\/strong\u003e 1\/2\" or 5\/8\" belt compatibility on supported applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Style:\u003c\/strong\u003e connector style as shown in product photos\u003c\/li\u003e\n\u003cli\u003eEncapsulated electromagnetic coil for reliable blade engagement\u003c\/li\u003e\n\u003cli\u003eFully assembled and ready to install after fitment verification\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eCompatible Brands \u0026amp; Models\u003c\/h2\u003e\n\u003cp\u003eThis PTO clutch fits select \u003cstrong\u003eJohn Deere\u003c\/strong\u003e lawn tractor applications using the \u003cstrong\u003eAM100979 \/ Warner 5215-35\u003c\/strong\u003e clutch path.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere STX38:\u003c\/strong\u003e select yellow deck applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere STX30:\u003c\/strong\u003e select applications using the AM100979 clutch path\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere 108, 111, 112-L, 116, 120, 130, 160, 165, 170, 175:\u003c\/strong\u003e verify original clutch number before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFitment note:\u003c\/strong\u003e If your mower is an \u003cstrong\u003eSTX38 black deck\u003c\/strong\u003e or \u003cstrong\u003eSTX46 black deck\u003c\/strong\u003e, do not rely on the STX model name alone. Black deck STX38 and STX46 tractors commonly use a different clutch path.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShopping for the black deck version?\u003c\/strong\u003e See the \u003ca href=\"\/blogs\/pto-clutch-guides\/john-deere-stx-pto-clutch-replacement\"\u003e\u003cstrong\u003eJohn Deere STX PTO clutch replacement guide\u003c\/strong\u003e\u003c\/a\u003e to compare Yellow Deck, early Black Deck, and later Black Deck clutch paths.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eReplaces OEM Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere:\u003c\/strong\u003e AM100979, AM115090, AM118969, AM122969\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eAftermarket Cross-Reference Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarner:\u003c\/strong\u003e 5215-35, 521535\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eXtreme:\u003c\/strong\u003e X0407\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eComplete electric PTO clutch assembly\u003c\/li\u003e\n\u003cli\u003eFactory-balanced 5.50\" pulley\u003c\/li\u003e\n\u003cli\u003ePre-installed bearing assembly\u003c\/li\u003e\n\u003cli\u003eEncapsulated electromagnetic coil\u003c\/li\u003e\n\u003cli\u003eConnector style as shown in product photos\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Buy From PTO Direct USA?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFast USA shipping\u003c\/li\u003e\n\u003cli\u003e\u003ca title=\"Fitment Guarantee Explained\" href=\"\/pages\/fitment-guarantee\"\u003eFitment Guarantee\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e1-year warranty\u003c\/li\u003e\n\u003cli\u003eFitment-first product support\u003c\/li\u003e\n\u003cli\u003eClear product images for easier clutch identification\u003c\/li\u003e\n\u003cli\u003eTrusted replacement supplier for homeowners, repair shops, and mower service professionals\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eDoes this PTO clutch fit every John Deere STX38?\u003c\/h3\u003e\n\u003cp\u003eNo. The John Deere STX38 has different clutch paths depending on deck color, serial range, and original clutch number. This AM100979 listing is for select \u003cstrong\u003eSTX38 yellow deck\u003c\/strong\u003e applications. Black deck STX38 tractors commonly use a different clutch path.\u003c\/p\u003e\n\u003ch3\u003eIs this the correct clutch for a yellow deck STX38?\u003c\/h3\u003e\n\u003cp\u003eYes, this is the yellow deck STX38 clutch path when your original clutch number matches \u003cstrong\u003eAM100979\u003c\/strong\u003e, \u003cstrong\u003eAM115090\u003c\/strong\u003e, \u003cstrong\u003eAM118969\u003c\/strong\u003e, \u003cstrong\u003eAM122969\u003c\/strong\u003e, or \u003cstrong\u003eWarner 5215-35\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs this the correct clutch for a Black Deck STX38?\u003c\/h3\u003e\n\u003cp\u003eNo. This \u003cstrong\u003eAM100979\u003c\/strong\u003e clutch is for select \u003cstrong\u003eSTX38 Yellow Deck\u003c\/strong\u003e applications. If your STX38 has a \u003cstrong\u003eBlack Deck\u003c\/strong\u003e, use the \u003ca href=\"\/blogs\/pto-clutch-guides\/john-deere-stx-pto-clutch-replacement\"\u003e\u003cstrong\u003eJohn Deere STX PTO clutch replacement guide\u003c\/strong\u003e\u003c\/a\u003e to compare the early Black Deck and later Black Deck clutch paths before ordering.\u003c\/p\u003e\n\u003ch3\u003eIs this the correct clutch for an STX46?\u003c\/h3\u003e\n\u003cp\u003eNo. This \u003cstrong\u003eAM100979\u003c\/strong\u003e clutch is not intended for typical \u003cstrong\u003eSTX46 Black Deck\u003c\/strong\u003e applications. STX46 fitment can vary by serial range and original clutch number. Use the \u003ca href=\"\/blogs\/pto-clutch-guides\/john-deere-stx-pto-clutch-replacement\"\u003e\u003cstrong\u003eJohn Deere STX PTO clutch replacement guide\u003c\/strong\u003e\u003c\/a\u003e before ordering if you are comparing STX46 fitment.\u003c\/p\u003e\n\u003ch3\u003eWhat bore size does this clutch use?\u003c\/h3\u003e\n\u003cp\u003eThis clutch uses a \u003cstrong\u003e1-inch bore\u003c\/strong\u003e. Confirm your crankshaft size before ordering.\u003c\/p\u003e\n\u003ch3\u003eWhat pulley diameter does this clutch use?\u003c\/h3\u003e\n\u003cp\u003eThis clutch uses a \u003cstrong\u003e5.50-inch pulley diameter\u003c\/strong\u003e, also commonly described as \u003cstrong\u003e5-1\/2 inches\u003c\/strong\u003e. Do not substitute a smaller 5.31-inch pulley clutch unless your original part number confirms that separate path.\u003c\/p\u003e\n\u003ch3\u003eWhat rotation does this clutch use?\u003c\/h3\u003e\n\u003cp\u003eThis clutch uses \u003cstrong\u003ecounter-clockwise rotation\u003c\/strong\u003e, commonly written as \u003cstrong\u003eCCW\u003c\/strong\u003e. Match rotation to your original clutch before installing a replacement.\u003c\/p\u003e\n\u003ch3\u003eWhy does deck color matter on the STX38?\u003c\/h3\u003e\n\u003cp\u003eJohn Deere STX38 yellow deck and black deck tractors can use different PTO clutch paths. The deck color is an important fitment clue, but the original clutch number is still the most reliable way to confirm the correct replacement.\u003c\/p\u003e\n\u003ch3\u003eCan PTO Direct USA help me confirm STX38 fitment?\u003c\/h3\u003e\n\u003cp\u003eYes. Email \u003cstrong\u003esupport@ptodirectusa.com\u003c\/strong\u003e with your mower model number, serial number, deck color, original clutch number, and clear photos of the old clutch. For STX38 tractors, include a photo showing whether the mower has a yellow deck or black deck.\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003eFor model-specific fitment help, see the \u003cstrong\u003e\u003ca href=\"\/pages\/john-deere-stx38-pto-clutch-replacement\"\u003eSTX38 PTO clutch replacement page\u003c\/a\u003e\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eNeed help checking crankshaft size? Read the \u003ca href=\"\/blogs\/pto-clutch-fitment-guides\/pto-clutch-bore-size-guide\"\u003e\u003cstrong\u003ePTO clutch bore size guide\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eNeed help with rotation? Read the \u003ca href=\"\/blogs\/pto-clutch-fitment-guides\/pto-clutch-rotation-guide\"\u003e\u003cstrong\u003ePTO clutch rotation guide\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eIf your old clutch will not come off the crankshaft, read the \u003ca href=\"\/blogs\/troubleshooting\/pto-clutch-stuck-on-crankshaft\"\u003e\u003cstrong\u003ePTO clutch stuck on crankshaft guide\u003c\/strong\u003e\u003c\/a\u003e before prying or hammering.\u003c\/p\u003e\n\u003cp\u003eNeed a different John Deere clutch? Browse the \u003ca href=\"\/collections\/john-deere-pto-clutches\"\u003e\u003cstrong\u003eJohn Deere PTO clutch collection\u003c\/strong\u003e\u003c\/a\u003e or the full \u003ca href=\"\/collections\/pto-clutches\"\u003e\u003cstrong\u003eelectric PTO clutch catalog\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e","brand":"PTO Direct USA","offers":[{"title":"Default Title","offer_id":52941773635951,"sku":"PTO-AM100979","price":144.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0957\/5058\/6735\/files\/am100979-pto-clutch-replacement-main.jpg?v=1778553836","url":"https:\/\/ptodirectusa.com\/products\/pto-clutch-am100979","provider":"PTO Direct USA","version":"1.0","type":"link"}