{"product_id":"1a646025810-transmission-drive-pulley-4-25-od-for-tuff-torq-k46-k57-husqvarna","title":"1A646025810 Transmission Drive Pulley 4.25 OD for Tuff Torq K46 K57 Husqvarna","description":"\u003cstrong\u003eThis Transmission Drive Pulley is a replacement pulley compatible with Tuff Torq K46 and K57 transaxles and matches OEM Part# 1A646025810.\u003c\/strong\u003e \u003ch2\u003eProduct Overview\u003c\/h2\u003e The Transmission Drive Pulley (1A646025810) is engineered to replace a worn or damaged input pulley on Tuff Torq K46 and K57 hydrostatic transaxles. This 4.25\" OD drive pulley restores positive belt grip, eliminating slip and maintaining consistent ground speed on Husqvarna mowers and tractors equipped with those transmissions. A rugged direct bolt-on solution that gets the transmission drive system back to factory spec. \u003ch3\u003eKey Features \u0026amp; Performance\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eReplaces OEM part number 1A646025810 with exact 4.25-inch outer diameter\u003c\/li\u003e \u003cli\u003ePrecision-machined bore and keyway for a secure press-on fit\u003c\/li\u003e \u003cli\u003eEngineered to handle high-torque loads generated by K46\/K57 transaxles\u003c\/li\u003e \u003cli\u003eRestores correct belt alignment and tension to maximize belt life\u003c\/li\u003e \u003cli\u003eHeavy-duty construction resists deformation and cracking under heat\u003c\/li\u003e \u003cli\u003eSwift installation without special tools—designed as a direct drop-in replacement\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eTuff Torq K46 transaxle models\u003c\/li\u003e \u003cli\u003eTuff Torq K57 transaxle models\u003c\/li\u003e \u003cli\u003eHusqvarna lawn tractors and zero-turns equipped with Tuff Torq K46 or K57 (verify serial number break)\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eCommon Uses\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eReplacing a damaged or worn transmission input pulley on K46\/K57 hydrostatic transaxles\u003c\/li\u003e \u003cli\u003eRestoring proper belt grip to eliminate slipping under load or on inclines\u003c\/li\u003e \u003cli\u003eTransmission service repairs on Husqvarna riding mowers\u003c\/li\u003e \u003cli\u003ePreventative upgrade when moving from a plastic factory pulley to a durable steel pulley\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number(s):\u003c\/strong\u003e 1A646025810\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 4.25 inches\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatible Transaxle Models:\u003c\/strong\u003e Tuff Torq K46, K57\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e What is the significance of the 4.25-inch OD?\u003cstrong\u003e A:\u003c\/strong\u003e The outer diameter matches the factory specification to ensure correct belt speed and tension on Tuff Torq K46 and K57 transmissions, preventing slippage and inconsistent drive performance.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this pulley fit any Husqvarna with a K46 transmission?\u003cstrong\u003e A:\u003c\/strong\u003e Yes, it is designed for Tuff Torq K46 and K57 transaxles commonly used in numerous Husqvarna models. Always confirm your original part number (1A646025810) and transaxle tag before ordering.\u003c\/p\u003e \u003cp\u003e\u003cem\u003eProduct appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.\u003c\/em\u003e\u003c\/p\u003e","brand":"DURAFORCE","offers":[{"title":"Default Title","offer_id":53679682715921,"sku":"ZZ3A00290","price":63.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0250\/2446\/2929\/files\/57_ae6f264e-ed21-4ea0-9a4e-28a3e3465d7d.jpg?v=1781652924","url":"https:\/\/www.duraforce.com\/products\/1a646025810-transmission-drive-pulley-4-25-od-for-tuff-torq-k46-k57-husqvarna","provider":"DURAFORCE","version":"1.0","type":"link"}