{"product_id":"stihl-wb03-740-5900","title":"STIHL WB03 740 5900 Aluminum Long Shaft Spindle Assembly | OEM RZ Mower","description":"\u003cdiv class=\"product-description stihl-wb03-740-5900-oem-aluminum-long-shaft-spindle-assembly\"\u003e\n\u003ch2\u003eSTIHL WB03 740 5900 OEM Aluminum Long Shaft Spindle Assembly\u003c\/h2\u003e\n\u003cp\u003eThe STIHL WB03 740 5900 Spindle Assembly is a genuine OEM STIHL replacement mower deck spindle assembly for select STIHL RZ zero-turn mower decks. This spindle is listed as SPINDLE ASSM, ALUMINUM, LONG SHAFT and is used in the Mower Deck - Housing, Covers, Spindles and Blades section for compatible 52\" and 60\" STIHL RZ mower deck applications.\u003c\/p\u003e\n\u003cp\u003eThe mower deck spindle supports the blade and allows it to rotate smoothly at high speed during mowing. A worn, damaged, loose, or noisy spindle can cause deck vibration, poor cut quality, blade wobble, belt wear, pulley damage, and bearing noise.\u003c\/p\u003e\n\u003cp\u003eAlways verify your full STIHL mower model, deck size, original spindle part number, spindle position, blade hardware, pulley setup, and parts diagram before ordering. Spindle fitment can vary by mower model, deck size, spindle style, shaft length, and deck configuration.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; border: 1px solid #ddd; padding: 8px;\"\u003eBrand\u003c\/th\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSTIHL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; border: 1px solid #ddd; padding: 8px;\"\u003ePart Number\u003c\/th\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eWB03 740 5900\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; border: 1px solid #ddd; padding: 8px;\"\u003eOEM Description\u003c\/th\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSpindle Assm, Aluminum, Long Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; border: 1px solid #ddd; padding: 8px;\"\u003eProduct Type\u003c\/th\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eMower Deck Spindle Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; border: 1px solid #ddd; padding: 8px;\"\u003eSpindle Style\u003c\/th\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eAluminum long shaft spindle assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; border: 1px solid #ddd; padding: 8px;\"\u003eCompatible Deck Sizes\u003c\/th\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003e52\" and 60\" where specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; border: 1px solid #ddd; padding: 8px;\"\u003eCommon Deck Section\u003c\/th\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eMower Deck - Housing, Covers, Spindles and Blades\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; border: 1px solid #ddd; padding: 8px;\"\u003eCompatible Model Families\u003c\/th\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eSTIHL RZ 552 and RZ 560 models where specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; border: 1px solid #ddd; padding: 8px;\"\u003eOEM \/ Aftermarket\u003c\/th\u003e\n\u003ctd style=\"border: 1px solid #ddd; padding: 8px;\"\u003eGenuine OEM STIHL replacement part\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eCompatible STIHL Model References\u003c\/h2\u003e\n\u003cp\u003eSTIHL WB03 740 5900 is listed for the following mower deck applications:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSTIHL RZ 552.0 - 52\" Mower Deck, Housing, Covers, Spindles and Blades\u003c\/li\u003e\n\u003cli\u003eSTIHL RZ 552.0 K - 52\" Mower Deck, Housing, Covers, Spindles and Blades\u003c\/li\u003e\n\u003cli\u003eSTIHL RZ 560.0 - 60\" Mower Deck, Housing, Covers, Spindles and Blades\u003c\/li\u003e\n\u003cli\u003eSTIHL RZ 560.0 K - 60\" Mower Deck, Housing, Covers, Spindles and Blades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eImportant: Confirm your mower has the correct 52\" or 60\" deck and that your STIHL parts diagram lists WB03 740 5900 before ordering. Do not order by model family or deck size alone.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine OEM STIHL mower deck spindle assembly\u003c\/li\u003e\n\u003cli\u003ePart number WB03 740 5900\u003c\/li\u003e\n\u003cli\u003eOEM description: Spindle Assm, Aluminum, Long Shaft\u003c\/li\u003e\n\u003cli\u003eAluminum long shaft spindle assembly\u003c\/li\u003e\n\u003cli\u003eDesigned for select STIHL RZ 552 and RZ 560 mower deck applications\u003c\/li\u003e\n\u003cli\u003eFits compatible 52\" and 60\" deck applications where specified\u003c\/li\u003e\n\u003cli\u003eUsed in the mower deck housing, covers, spindles, and blades section\u003c\/li\u003e\n\u003cli\u003eHelps restore proper blade support and deck operation\u003c\/li\u003e\n\u003cli\u003eFactory-correct replacement when listed in your STIHL parts diagram\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Choose an OEM STIHL Spindle Assembly?\u003c\/h2\u003e\n\u003cp\u003eThe spindle assembly is a critical mower deck component. It supports the mower blade, maintains blade alignment, and allows the blade to rotate smoothly under load. A worn or incorrect spindle can cause vibration, uneven cutting, bearing noise, blade wobble, and premature belt or pulley wear.\u003c\/p\u003e\n\u003cp\u003eGenuine STIHL spindle assemblies are built to match the correct deck housing, spindle shaft length, pulley setup, blade mounting style, and deck performance requirements. When your parts diagram lists WB03 740 5900, this OEM spindle assembly is the correct replacement for that application.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCorrect OEM fit when specified by STIHL\u003c\/li\u003e\n\u003cli\u003eDesigned for compatible STIHL 52\" and 60\" mower decks\u003c\/li\u003e\n\u003cli\u003eHelps maintain proper blade alignment and deck performance\u003c\/li\u003e\n\u003cli\u003eReduces guesswork compared to universal spindle assemblies\u003c\/li\u003e\n\u003cli\u003eRecommended for maintaining STIHL mower cutting performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhen to Replace a Mower Deck Spindle\u003c\/h2\u003e\n\u003cp\u003eReplace or inspect the spindle assembly if the mower deck has vibration, blade wobble, bearing noise, uneven cutting, or impact damage. A failing spindle can damage belts, pulleys, blades, and deck housings if not repaired.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSpindle bearings are noisy, rough, or loose\u003c\/li\u003e\n\u003cli\u003eBlade has side-to-side movement or wobble\u003c\/li\u003e\n\u003cli\u003eDeck vibration has increased\u003c\/li\u003e\n\u003cli\u003eCut quality is uneven or streaking\u003c\/li\u003e\n\u003cli\u003eSpindle housing is cracked, damaged, or worn\u003c\/li\u003e\n\u003cli\u003eBlade bolt or mounting area is damaged\u003c\/li\u003e\n\u003cli\u003ePulley or belt wear is caused by spindle misalignment\u003c\/li\u003e\n\u003cli\u003eParts diagram lists STIHL WB03 740 5900 for your mower\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eImportant Fitment Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eThis is an aluminum long shaft spindle assembly\u003c\/li\u003e\n\u003cli\u003eFits select STIHL RZ 552 and RZ 560 mower decks where specified\u003c\/li\u003e\n\u003cli\u003eUsed on compatible 52\" and 60\" deck applications\u003c\/li\u003e\n\u003cli\u003eVerify the original spindle part number before ordering\u003c\/li\u003e\n\u003cli\u003eDo not order by deck size alone\u003c\/li\u003e\n\u003cli\u003eConfirm spindle location, pulley setup, blade hardware, shaft length, mounting pattern, and parts diagram\u003c\/li\u003e\n\u003cli\u003eInspect belts, pulleys, idlers, blades, and mounting hardware when replacing spindles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003ePre-Purchase Checklist\u003c\/h2\u003e\n\u003cp\u003eBefore ordering STIHL WB03 740 5900, confirm:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eYour full STIHL mower model number\u003c\/li\u003e\n\u003cli\u003eYour mower deck size\u003c\/li\u003e\n\u003cli\u003eYour original spindle assembly part number\u003c\/li\u003e\n\u003cli\u003eYour spindle position, if applicable\u003c\/li\u003e\n\u003cli\u003eYour parts diagram lists WB03 740 5900\u003c\/li\u003e\n\u003cli\u003eYour mower requires the aluminum long shaft spindle assembly\u003c\/li\u003e\n\u003cli\u003eYour pulley, blade, and mounting hardware match the original setup\u003c\/li\u003e\n\u003cli\u003eYou are ordering the correct spindle quantity for your repair\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eInstallation and Service Notes\u003c\/h2\u003e\n\u003cp\u003eSpindle replacement should be performed with the mower turned off, key removed, parking brake engaged, and all moving parts stopped. Follow the STIHL service instructions and deck diagram for your exact mower.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eWear gloves when handling mower blades\u003c\/li\u003e\n\u003cli\u003eInspect the blade, pulley, belt, and mounting hardware during service\u003c\/li\u003e\n\u003cli\u003eReplace damaged blade bolts, spindle hardware, or pulleys as needed\u003c\/li\u003e\n\u003cli\u003eFollow the correct torque specifications from the service manual\u003c\/li\u003e\n\u003cli\u003eVerify blade orientation and pulley alignment after installation\u003c\/li\u003e\n\u003cli\u003eRun and recheck the deck for vibration, noise, and proper belt tracking\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003ePart Number \/ Search Terms\u003c\/h2\u003e\n\u003cp\u003eSTIHL WB03 740 5900 may also be searched as:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSTIHL WB03 740 5900\u003c\/li\u003e\n\u003cli\u003eWB03 740 5900 spindle assembly\u003c\/li\u003e\n\u003cli\u003eSTIHL WB03 740 5900 spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL aluminum spindle assembly\u003c\/li\u003e\n\u003cli\u003eSTIHL long shaft spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL aluminum long shaft spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL RZ 552 spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL RZ 552.0 spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL RZ 552.0 K spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL RZ 560 spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL RZ 560.0 spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL RZ 560.0 K spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL 52\" deck spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL 60\" deck spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL mower deck spindle\u003c\/li\u003e\n\u003cli\u003eSTIHL OEM spindle assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is STIHL WB03 740 5900?\u003c\/summary\u003e\n\u003cp\u003eSTIHL WB03 740 5900 is a genuine OEM aluminum long shaft mower deck spindle assembly used on select STIHL RZ mower deck applications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat models does this spindle fit?\u003c\/summary\u003e\n\u003cp\u003eThis spindle is listed for select STIHL RZ 552 and RZ 560 models with compatible 52\" and 60\" mower decks where specified in the parts diagram.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this fit 52\" and 60\" decks?\u003c\/summary\u003e\n\u003cp\u003eYes, this spindle is listed for select 52\" RZ 552 mower decks and select 60\" RZ 560 mower decks where specified.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this an aluminum long shaft spindle?\u003c\/summary\u003e\n\u003cp\u003eYes. This part is listed as an aluminum long shaft spindle assembly.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I know if this spindle fits my mower?\u003c\/summary\u003e\n\u003cp\u003eVerify your full mower model number, deck size, original spindle part number, spindle position, shaft length, pulley setup, mounting pattern, and STIHL parts diagram before ordering.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs this an OEM STIHL spindle?\u003c\/summary\u003e\n\u003cp\u003eYes. This listing is for a genuine OEM STIHL replacement spindle assembly.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cp\u003eP\u0026amp;P Small Engines stocks genuine STIHL spindle assemblies, mower belts, blades, pulleys, idlers, filters, oils, accessories, and OEM replacement parts for homeowners and professionals.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Stihl","offers":[{"title":"Default Title","offer_id":50390637740225,"sku":"WB03 740 5900","price":292.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2803\/7330\/files\/Screenshot2026-07-09085613.png?v=1783605383","url":"https:\/\/pandpsmallengines.com\/products\/stihl-wb03-740-5900","provider":"P \u0026 P Small Engines","version":"1.0","type":"link"}