{"product_id":"deck-pulley-am143737","title":"AM143737 \/ AM136693 Idler Pulley for John Deere Z425 Z435 Z445","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003eAM143737 mower deck idler pulley\u003c\/strong\u003e replaces \u003cstrong\u003eJohn Deere AM136693\u003c\/strong\u003e on select John Deere lawn tractors and EZtrak or ZTrak zero-turn mower decks.\u003c\/p\u003e\n\u003cp\u003eThis flat idler pulley helps guide the mower deck belt and maintain proper belt alignment through the deck-drive system. Common applications include select \u003cstrong\u003eJohn Deere Z425, Z435, and Z445\u003c\/strong\u003e mowers equipped with compatible 48-inch or 54-inch decks.\u003c\/p\u003e\n\u003cp\u003eDo not order by mower model, deck width, or pulley appearance alone. John Deere decks can use multiple pulley sizes and positions within the same belt-routing system.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eAftermarket mower deck drive idler pulley\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Replacement Number:\u003c\/strong\u003e AM143737\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces Earlier John Deere Number:\u003c\/strong\u003e AM136693\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulley Type:\u003c\/strong\u003e flat mower deck idler pulley\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutside Flange Diameter:\u003c\/strong\u003e approximately 5.92 inches – 150.4 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Bore:\u003c\/strong\u003e approximately 0.66 inch – 16.7 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Width:\u003c\/strong\u003e approximately 1.04 inches – 26.47 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEffective Diameter:\u003c\/strong\u003e approximately 5 inches – 127 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt-Contact Width:\u003c\/strong\u003e approximately 0.75 inch – 19 mm\u003c\/li\u003e\n\u003cli\u003eComplete replacement pulley assembly with center bearing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eMeasurement note:\u003c\/strong\u003e The outside flange diameter is larger than the effective belt-contact diameter. Match the \u003cstrong\u003eAM143737 or AM136693\u003c\/strong\u003e part number first rather than comparing only one published pulley measurement.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eCompatible John Deere Models \u0026amp; Deck Paths\u003c\/h2\u003e\n\u003cp\u003eThis idler pulley fits select mower deck configurations within the following John Deere model paths:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eJohn Deere LT190\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eJohn Deere Z225\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eJohn Deere Z235\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eJohn Deere Z245\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eJohn Deere Z255\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere Z355E:\u003c\/strong\u003e select early-production applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere Z425:\u003c\/strong\u003e select 48-inch and 54-inch mower decks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere Z435:\u003c\/strong\u003e select 48-inch and 54-inch mower decks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eJohn Deere Z445:\u003c\/strong\u003e select 48-inch and 54-inch mower decks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFitment note:\u003c\/strong\u003e Not every deck configuration within these model families uses AM143737. Confirm the mower model, serial or PIN range, deck size, and AM143737 pulley callout in the model-specific parts diagram.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eReplaces OEM Part Numbers\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eJohn Deere AM143737\u003c\/li\u003e\n\u003cli\u003eJohn Deere AM136693\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eImportant Fitment Check\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eMatch the original pulley number before ordering.\u003c\/strong\u003e This replacement is intended for mower deck positions calling for \u003cstrong\u003eJohn Deere AM143737 or AM136693\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eDo not treat \u003cstrong\u003eAM143737, AM128118, and AM135526\u003c\/strong\u003e as interchangeable. These are separate pulley paths that can have different diameters, widths, offsets, and deck positions.\u003c\/p\u003e\n\u003cp\u003eCustomers whose original pulley or OEM diagram calls for \u003cstrong\u003eAM128118\u003c\/strong\u003e should use the dedicated \u003ca href=\"\/products\/deck-pulley-am128118\"\u003e\u003cstrong\u003eAM128118 deck pulley replacement\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eBefore Ordering\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm the original pulley or parts diagram calls for \u003cstrong\u003eAM143737 or AM136693\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eVerify the mower model, serial or PIN number, and deck size\u003c\/li\u003e\n\u003cli\u003eConfirm the pulley position in the deck-belt routing diagram\u003c\/li\u003e\n\u003cli\u003eCompare the center bore, pulley width, and outside diameter\u003c\/li\u003e\n\u003cli\u003eInspect the mounting bolt, spacer, washer, and idler arm\u003c\/li\u003e\n\u003cli\u003eCheck the deck belt, tension spring, spindle pulleys, and other idlers for wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eCommon Symptoms of a Worn Idler Pulley\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGrinding, squealing, rattling, or chirping from the mower deck\u003c\/li\u003e\n\u003cli\u003eDeck belt repeatedly coming off the pulleys\u003c\/li\u003e\n\u003cli\u003eVisible pulley wobble or looseness at the bearing\u003c\/li\u003e\n\u003cli\u003ePulley that does not rotate smoothly by hand\u003c\/li\u003e\n\u003cli\u003eUneven wear, fraying, or glazing along the deck belt\u003c\/li\u003e\n\u003cli\u003eExcessive heat around the pulley bearing\u003c\/li\u003e\n\u003cli\u003eReduced blade speed caused by poor belt tracking\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA worn belt, weak tension spring, bent idler arm, seized spindle, or damaged mounting hardware can quickly damage a replacement pulley. Inspect the complete deck-drive system before installation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 aftermarket AM143737 mower deck idler pulley assembly\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\u003eFitment-first replacement-parts descriptions\u003c\/li\u003e\n\u003cli\u003eClear OEM part-number and supersession routing\u003c\/li\u003e\n\u003cli\u003eRelated mower deck belts, blades, spindles, and pulleys available\u003c\/li\u003e\n\u003cli\u003eSupport for homeowners, repair shops, and landscape crews\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eNeed Help Confirming Fitment?\u003c\/h2\u003e\n\u003cp\u003eStill not sure which deck pulley fits your mower? \u003ca href=\"\/pages\/contact\"\u003e\u003cstrong\u003eContact us for fitment help\u003c\/strong\u003e\u003c\/a\u003e and send a clear picture of the mower identification tag or the original pulley part number.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eWhat does AM143737 replace?\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eJohn Deere AM143737 replaces the earlier AM136693 mower deck idler pulley\u003c\/strong\u003e on compatible applications.\u003c\/p\u003e\n\u003ch3\u003eWhat are the approximate AM143737 pulley dimensions?\u003c\/h3\u003e\n\u003cp\u003eThis aftermarket replacement has an outside flange diameter of approximately \u003cstrong\u003e5.92 inches\u003c\/strong\u003e, a center bore of approximately \u003cstrong\u003e0.66 inch\u003c\/strong\u003e, and an overall width of approximately \u003cstrong\u003e1.04 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eWhy does John Deere list a 5-inch diameter?\u003c\/h3\u003e\n\u003cp\u003eJohn Deere publishes an approximately \u003cstrong\u003e5-inch effective diameter\u003c\/strong\u003e, which refers to the belt-contact area. The approximately 5.92-inch replacement measurement is taken across the outer pulley flanges.\u003c\/p\u003e\n\u003ch3\u003eDoes AM143737 fit the John Deere Z425?\u003c\/h3\u003e\n\u003cp\u003eYes. AM143737 is used in select John Deere Z425 48-inch and 54-inch mower deck configurations. Confirm the exact pulley callout because the deck can use several different idler positions.\u003c\/p\u003e\n\u003ch3\u003eDoes AM143737 fit the John Deere Z435 and Z445?\u003c\/h3\u003e\n\u003cp\u003eYes. AM143737 is used on select Z435 and Z445 48-inch and 54-inch mower deck paths. Match the mower serial or PIN range and deck diagram before ordering.\u003c\/p\u003e\n\u003ch3\u003eIs AM143737 the same as AM128118?\u003c\/h3\u003e\n\u003cp\u003eNo. \u003cstrong\u003eAM143737 and AM128118 are separate mower deck pulley paths\u003c\/strong\u003e with different physical dimensions and deck positions. See the \u003ca href=\"\/products\/deck-pulley-am128118\"\u003e\u003cstrong\u003eAM128118 deck pulley listing\u003c\/strong\u003e\u003c\/a\u003e when that number appears in the original diagram.\u003c\/p\u003e\n\u003ch3\u003eIs AM143737 the same as AM135526?\u003c\/h3\u003e\n\u003cp\u003eNo. AM143737 and AM135526 are separate pulley numbers. Do not substitute them based on appearance or mower model alone.\u003c\/p\u003e\n\u003ch3\u003eCan I order this pulley by deck width?\u003c\/h3\u003e\n\u003cp\u003eNo. A 48-inch or 54-inch John Deere deck can contain multiple idler pulleys. Match the exact OEM number and diagram position before ordering.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eRelated John Deere Parts \u0026amp; Guides\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/deck-pulley-am128118\"\u003e\u003cstrong\u003eJohn Deere AM128118 deck pulley replacement\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/deck-belt-m158130\"\u003e\u003cstrong\u003eJohn Deere M158130 mower deck belt replacement\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/deck-belt-m158131\"\u003e\u003cstrong\u003eJohn Deere M158131 \/ M154296 mower deck belt replacement\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/john-deere-quick-reference\/john-deere-z425\"\u003e\u003cstrong\u003eJohn Deere Z425 PTO clutch and deck parts quick reference\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/john-deere-quick-reference\"\u003e\u003cstrong\u003eJohn Deere Model Reference Quick Lookup Library\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/pulleys\"\u003e\u003cstrong\u003eBrowse mower deck pulleys and idlers\u003c\/strong\u003e\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PTO Direct USA","offers":[{"title":"Default Title","offer_id":53224653390191,"sku":"CAL-275905327662","price":34.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0957\/5058\/6735\/files\/AM143737-pulley.jpg?v=1784432464","url":"https:\/\/ptodirectusa.com\/products\/deck-pulley-am143737","provider":"PTO Direct USA","version":"1.0","type":"link"}