{"product_id":"pto-clutch-am121972","title":"AM121972 PTO Clutch Replacement for John Deere STX38, STX46 Black Deck | Serial 270001+","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003eAM121972 PTO clutch replacement\u003c\/strong\u003e is an aftermarket electric PTO clutch for select \u003cstrong\u003eJohn Deere STX38 and STX46 black deck lawn tractor applications\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant STX38 fitment warning:\u003c\/strong\u003e John Deere STX38 clutch fitment can vary by \u003cstrong\u003edeck color, serial range, and original clutch number\u003c\/strong\u003e. This AM121972 listing is for the \u003cstrong\u003eblack deck STX38 \/ STX46 clutch path\u003c\/strong\u003e, commonly associated with \u003cstrong\u003eserial number 270001 and higher\u003c\/strong\u003e. Do not order this clutch for a yellow deck STX38 unless your original clutch number matches \u003cstrong\u003eAM121972\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis clutch replaces \u003cstrong\u003eJohn Deere AM121972\u003c\/strong\u003e and cross-references \u003cstrong\u003eWarner 5217-8\u003c\/strong\u003e, \u003cstrong\u003e5217-20\u003c\/strong\u003e, \u003cstrong\u003e5217-36\u003c\/strong\u003e, \u003cstrong\u003e5217-38\u003c\/strong\u003e, \u003cstrong\u003eOregon 84-003\u003c\/strong\u003e, and \u003cstrong\u003eStens 255-141\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eBuilt with a \u003cstrong\u003e1-inch crankshaft bore\u003c\/strong\u003e, \u003cstrong\u003e5.20-inch pulley diameter\u003c\/strong\u003e, and \u003cstrong\u003ecounter-clockwise rotation\u003c\/strong\u003e, this clutch is designed to restore reliable mower deck blade engagement when matched to the correct original clutch number and physical specs.\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 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 5.20\"\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\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\u003eSealed bearing assembly for mower deck operating conditions\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 STX Series\u003c\/strong\u003e lawn tractors using the \u003cstrong\u003eAM121972\u003c\/strong\u003e clutch path. Fitment depends on deck color, serial range, original clutch number, bore size, pulley diameter, rotation, connector style, and overall clutch height.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere STX38:\u003c\/strong\u003e select black deck applications, commonly serial number 270001 and higher\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere STX46:\u003c\/strong\u003e select black deck applications using AM121972\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFitment note:\u003c\/strong\u003e If your mower is an \u003cstrong\u003eSTX38 yellow deck\u003c\/strong\u003e, do not rely on the STX38 model name alone. Match the original clutch number before ordering. Yellow deck and black deck STX38 tractors can use different PTO clutch paths.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHave a yellow deck STX38?\u003c\/strong\u003e See the \u003ca href=\"\/products\/pto-clutch-am100979\"\u003e\u003cstrong\u003eAM100979 PTO clutch replacement for John Deere STX38 yellow deck\u003c\/strong\u003e\u003c\/a\u003e. This AM121972 page is for the black deck STX38 \/ STX46 clutch path, so match your original clutch number before ordering.\u003c\/p\u003e\n\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 AM121972\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAdditional part-number references:\u003c\/strong\u003e Cross-reference data also lists \u003cstrong\u003eHonda 80186-VK1-003\u003c\/strong\u003e and \u003cstrong\u003eSolo 183990600\u003c\/strong\u003e. This product page is written for the \u003cstrong\u003eJohn Deere AM121972 STX black deck fitment path\u003c\/strong\u003e, however this clutch is confirmed as a valid replacement for those part numbers as well.\u003c\/p\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 5217-8, 5217-20, 5217-36, 5217-38\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOregon:\u003c\/strong\u003e 84-003\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStens:\u003c\/strong\u003e 255-141\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 5.20\" 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 AM121972 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 AM121972 listing is for select \u003cstrong\u003eblack deck STX38 and STX46\u003c\/strong\u003e applications, commonly serial number \u003cstrong\u003e270001 and higher\u003c\/strong\u003e. If you have a yellow deck STX38, verify the original clutch number before ordering.\u003c\/p\u003e\n\u003ch3\u003eIs this the correct clutch for a yellow deck STX38?\u003c\/h3\u003e\n\u003cp\u003eNo. If your John Deere STX38 has a yellow deck, see the \u003ca href=\"\/products\/pto-clutch-am100979\"\u003e\u003cstrong\u003eAM100979 PTO clutch replacement\u003c\/strong\u003e\u003c\/a\u003e instead. This AM121972 listing is for select black deck STX38 \/ STX46 applications, commonly associated with serial number 270001 and higher.\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\u003e5.20-inch pulley diameter\u003c\/strong\u003e. Compare your original clutch and product photos before ordering.\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\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 black deck or yellow 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 and \u003cstrong\u003e\u003ca href=\"\/pages\/john-deere-stx46-pto-clutch-replacement\"\u003eSTX46 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":52758223978863,"sku":"PTO-AM121972","price":144.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0957\/5058\/6735\/files\/am121972-pto-clutch-real.jpg?v=1780043065","url":"https:\/\/ptodirectusa.com\/products\/pto-clutch-am121972","provider":"PTO Direct USA","version":"1.0","type":"link"}