{"product_id":"pto-clutch-539102603","title":"539102603 \/ 102603 PTO Clutch Replacement for Husqvarna ZTH5223A \u0026 ZTH5225A | Warner 5218-5","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThis \u003cstrong\u003e539102603 PTO clutch replacement\u003c\/strong\u003e is an aftermarket electric clutch for select \u003cstrong\u003eHusqvarna ZTH commercial zero-turn mowers\u003c\/strong\u003e, including supported \u003cstrong\u003eZTH5223A\u003c\/strong\u003e and \u003cstrong\u003eZTH5225A\u003c\/strong\u003e applications. It also replaces \u003cstrong\u003e102603\u003c\/strong\u003e, \u003cstrong\u003e539109580\u003c\/strong\u003e, and \u003cstrong\u003e109580\u003c\/strong\u003e on compatible installations.\u003c\/p\u003e\n\u003cp\u003eThe assembly features a \u003cstrong\u003e1-1\/8-inch crankshaft bore\u003c\/strong\u003e, a \u003cstrong\u003esingle-groove pulley measuring approximately 6-1\/8 inches outside diameter\u003c\/strong\u003e, \u003cstrong\u003eclockwise rotation viewed from the pulley side\u003c\/strong\u003e, and a \u003cstrong\u003ereverse-mount configuration\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 select Husqvarna ZTH applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary OEM Reference:\u003c\/strong\u003e Husqvarna 539102603\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditional OEM References:\u003c\/strong\u003e 102603, 539109580, 109580\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrankshaft Bore:\u003c\/strong\u003e 1-1\/8 inches \/ 1.125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMeasured Pulley Outside Diameter:\u003c\/strong\u003e approximately 6-1\/8 inches \/ 6.125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePulley Type:\u003c\/strong\u003e single-groove V-belt pulley\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Width:\u003c\/strong\u003e 5\/8-inch belt on supported applications; use the OEM-specified belt for your mower\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRotation:\u003c\/strong\u003e clockwise (CW), viewed from the pulley side\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e reverse mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector:\u003c\/strong\u003e flat side-by-side at clutch or optional wire harness to extend to T-plug\u003c\/li\u003e\n\u003cli\u003eIntegrated electromagnetic clutch and brake assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eCompatible Husqvarna Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHusqvarna ZTH5223A:\u003c\/strong\u003e select applications specifying one of the OEM clutch numbers listed below\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHusqvarna ZTH5225A:\u003c\/strong\u003e select applications specifying one of the OEM clutch numbers listed below\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFitment varies by product number, serial number, and engine configuration. Confirm the number on your original clutch or consult the Husqvarna parts diagram for your exact mower. Do not order by the ZTH series name alone.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eOEM Part Number References\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHusqvarna:\u003c\/strong\u003e 539102603, 539109580\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShort-form catalog references:\u003c\/strong\u003e 102603, 109580\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eManufacturer Cross-Reference\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarner Electric:\u003c\/strong\u003e 5218-5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarner Electric:\u003c\/strong\u003e 52185\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eBefore You Order\u003c\/h2\u003e\n\u003cp\u003eCompare your original clutch with the product photos and confirm:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe original clutch number matches an application listed above\u003c\/li\u003e\n\u003cli\u003eThe crankshaft requires a \u003cstrong\u003e1-1\/8-inch bore\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe bore and key arrangement match your original assembly\u003c\/li\u003e\n\u003cli\u003eThe mower uses a \u003cstrong\u003esingle-groove, reverse-mount clutch\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eRotation is \u003cstrong\u003eCW when viewed from the pulley side\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eThe belt groove, pulley offset, and mounting height suit your mower\u003c\/li\u003e\n\u003cli\u003eThe wiring connector and anti-rotation connection match the installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNeed help comparing your clutch? Send us your mower model, product number, serial number, original clutch number, and clear photos before ordering.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eComplete aftermarket electric PTO clutch assembly\u003c\/li\u003e\n\u003cli\u003eIntegrated single-groove pulley\u003c\/li\u003e\n\u003cli\u003ePre-installed bearing assembly\u003c\/li\u003e\n\u003cli\u003eElectromagnetic coil and brake assembly\u003c\/li\u003e\n\u003cli\u003eFlat side-by-side clutch connector\u003c\/li\u003e\n\u003cli\u003eOptional wire harness extension\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 href=\"\/pages\/fitment-guarantee\"\u003eFitment Guarantee\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eFitment support before and after purchase\u003c\/li\u003e\n\u003cli\u003eClear product photos for easier clutch identification\u003c\/li\u003e\n\u003cli\u003eSupport for homeowners, commercial operators, and mower repair professionals\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eDoes this PTO clutch replace Husqvarna 539102603?\u003c\/h3\u003e\n\u003cp\u003eYes. This aftermarket clutch is offered as a replacement for \u003cstrong\u003eHusqvarna 539102603\u003c\/strong\u003e on supported applications. Match your original clutch number and physical configuration before ordering.\u003c\/p\u003e\n\u003ch3\u003eAre 102603, 539109580, and 109580 covered by this listing?\u003c\/h3\u003e\n\u003cp\u003eYes. These references are included in this replacement’s Husqvarna application family. Check the original clutch number, connector, and mounting configuration against your mower before purchasing.\u003c\/p\u003e\n\u003ch3\u003eDoes this fit every Husqvarna ZTH mower?\u003c\/h3\u003e\n\u003cp\u003eNo. This listing covers select \u003cstrong\u003eZTH5223A\u003c\/strong\u003e and \u003cstrong\u003eZTH5225A\u003c\/strong\u003e applications using the listed clutch numbers. Other ZTH models and configurations may require a different clutch.\u003c\/p\u003e\n\u003ch3\u003eWhy do some reference specifications list a 6.3-inch pulley?\u003c\/h3\u003e\n\u003cp\u003eWarner lists a \u003cstrong\u003e6.31-inch outside diameter\u003c\/strong\u003e for its \u003cstrong\u003e5218-5\u003c\/strong\u003e clutch. The aftermarket unit offered here has a measured outside diameter of approximately \u003cstrong\u003e6.125 inches\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eOutside diameter and the working diameter where the belt rides are different measurements. For belt speed, the critical measurement is that working diameter—not the outer flange edge. This aftermarket clutch is designed to replace the OEM and manufacturer part numbers listed here.\u003c\/p\u003e\n\u003ch3\u003eWhat bore size does this clutch use?\u003c\/h3\u003e\n\u003cp\u003eThis clutch has a \u003cstrong\u003e1-1\/8-inch crankshaft bore\u003c\/strong\u003e, also written as \u003cstrong\u003e1.125 inches\u003c\/strong\u003e. Match the bore and key arrangement to your original clutch.\u003c\/p\u003e\n\u003ch3\u003eIs this a reverse-mount clutch?\u003c\/h3\u003e\n\u003cp\u003eYes. This replacement uses a \u003cstrong\u003ereverse-mount configuration\u003c\/strong\u003e. Follow the mounting orientation and spacer arrangement specified for your mower. Product-photo orientation is not an installation diagram.\u003c\/p\u003e\n\u003ch3\u003eWhat connector does this clutch use?\u003c\/h3\u003e\n\u003cp\u003eThe clutch has a \u003cstrong\u003eflat side-by-side connector\u003c\/strong\u003e. An optional wire harness extends the connection to a \u003cstrong\u003eT-plug\u003c\/strong\u003e. Compare your mower’s wiring connection before choosing the configuration.\u003c\/p\u003e\n\u003ch3\u003eWhat belt should I use?\u003c\/h3\u003e\n\u003cp\u003eUse the \u003cstrong\u003eOEM-specified belt for your exact mower and deck configuration\u003c\/strong\u003e. Belt width, length, and profile must suit the complete drive system.\u003c\/p\u003e\n\u003ch3\u003eCan PTO Direct USA help confirm fitment?\u003c\/h3\u003e\n\u003cp\u003eYes. We provide fitment support before and after purchase. Email \u003cstrong\u003esupport@ptodirectusa.com\u003c\/strong\u003e with your mower model, product number, serial number, engine information, and original clutch number. Include photos of the clutch label, bore, pulley, connector, and anti-rotation connection.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eFitment Help \u0026amp; Resources\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/pages\/pto-clutch-fitment-guide\"\u003ePTO Clutch Fitment Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/pto-clutch-fitment-guides\/pto-clutch-bore-size-guide\"\u003ePTO Clutch Bore Size Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/pto-clutch-fitment-guides\/pto-clutch-rotation-guide\"\u003ePTO Clutch Rotation Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/troubleshooting\/pto-clutch-stuck-on-crankshaft\"\u003ePTO Clutch Stuck on Crankshaft Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/collections\/pto-clutches\"\u003eBrowse the Full Electric PTO Clutch Catalog\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PTO Direct USA","offers":[{"title":"Default Title","offer_id":53404092465519,"sku":"PTO-539102603-ECP-102397","price":178.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0957\/5058\/6735\/files\/539102603-pto-clutch-hero.jpg?v=1788141803","url":"https:\/\/ptodirectusa.com\/products\/pto-clutch-539102603","provider":"PTO Direct USA","version":"1.0","type":"link"}