{"product_id":"husqvarna-539101177-5mm-square-key-genuine-oem-replacement-equipment-key","title":"Husqvarna 539101177 5mm Square Key – Genuine OEM Replacement Equipment Key","description":"\u003cdiv class=\"\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--sticky-padding-top)\" dir=\"auto\"\u003e\u003c\/section\u003e\n\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-8 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv dir=\"auto\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 539101177\u003cbr\u003e\u003cstrong\u003eCategory:\u003c\/strong\u003e Lawn Mower, Outdoor Power Equipment \u0026amp; Drivetrain Hardware\u003cbr\u003e\u003cstrong\u003eType:\u003c\/strong\u003e 5mm Square Key – Genuine OEM Replacement Equipment Key\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003eThe \u003cstrong\u003eHusqvarna 539101177 5mm Square Key\u003c\/strong\u003e is a genuine OEM replacement mechanical key designed for select \u003cstrong\u003eHusqvarna lawn mowers and compatible outdoor power equipment\u003c\/strong\u003e. This precision hardware component is designed to fit into the corresponding keyways of a shaft and mating component, helping maintain their rotational connection and alignment.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 539101177\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Husqvarna\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Square Key\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Description:\u003c\/strong\u003e Key, 5mm Square\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternate Description:\u003c\/strong\u003e Shaft Key \/ Drive Key \/ Machine Key \/ Key Stock\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal Size:\u003c\/strong\u003e 5mm Square\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Mechanical Drivetrain \/ Shaft Hardware\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Locks Applicable Shaft-Mounted Components Together for Rotational Power Transfer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Application:\u003c\/strong\u003e Husqvarna Outdoor Power Equipment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Drivetrain \/ Mechanical Assembly – Model Dependent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Brand:\u003c\/strong\u003e Husqvarna\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Location:\u003c\/strong\u003e Shaft Keyway – Application Dependent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssociated Components:\u003c\/strong\u003e Shaft \/ Hub \/ Pulley \/ Gear \/ Coupling – Application Dependent\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement Type:\u003c\/strong\u003e Direct OEM Replacement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Status:\u003c\/strong\u003e Genuine Husqvarna OEM Part\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 Square Key\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number Reference:\u003c\/strong\u003e 539101177\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternate Number Format:\u003c\/strong\u003e 539 10 11-77\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eFeatures \u0026amp; Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Husqvarna OEM replacement component\u003c\/li\u003e\n\u003cli\u003eFactory-specified \u003cstrong\u003e5mm square key\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDesigned for compatible Husqvarna equipment\u003c\/li\u003e\n\u003cli\u003eFits into the applicable machined shaft keyway\u003c\/li\u003e\n\u003cli\u003eHelps maintain rotational engagement between mating components\u003c\/li\u003e\n\u003cli\u003eSupports proper torque transfer\u003c\/li\u003e\n\u003cli\u003eHelps prevent independent rotation between a shaft and attached component\u003c\/li\u003e\n\u003cli\u003eApplication-specific OEM dimensions\u003c\/li\u003e\n\u003cli\u003eCompact, durable mechanical hardware component\u003c\/li\u003e\n\u003cli\u003eDesigned to maintain the original equipment configuration\u003c\/li\u003e\n\u003cli\u003eSuitable for replacing worn, damaged, sheared, or missing keys\u003c\/li\u003e\n\u003cli\u003eDirect replacement for equipment specifying \u003cstrong\u003e539101177\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eGenuine OEM hardware rather than unspecified universal key stock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eSquare Key Function\u003c\/h2\u003e\n\u003cp\u003eA square key is a mechanical component positioned between a shaft and a shaft-mounted component.\u003c\/p\u003e\n\u003cp\u003eThe shaft and mating component typically contain matching slots known as \u003cstrong\u003ekeyways\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eDuring assembly, the square key sits between these keyways and mechanically connects the components.\u003c\/p\u003e\n\u003cp\u003eDepending on the equipment configuration, the mating component may be a:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePulley\u003c\/li\u003e\n\u003cli\u003eGear\u003c\/li\u003e\n\u003cli\u003eHub\u003c\/li\u003e\n\u003cli\u003eCoupling\u003c\/li\u003e\n\u003cli\u003eSprocket\u003c\/li\u003e\n\u003cli\u003eDrive component\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe key helps ensure that rotation of the shaft is transmitted to the attached component.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e5mm Square Design\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e539101177\u003c\/strong\u003e is identified as a \u003cstrong\u003e5mm square key\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe square dimensions are important because the key must properly fit the corresponding keyway.\u003c\/p\u003e\n\u003cp\u003eAn incorrectly sized key can result in:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eExcessive clearance\u003c\/li\u003e\n\u003cli\u003eLoose component fit\u003c\/li\u003e\n\u003cli\u003ePoor torque transfer\u003c\/li\u003e\n\u003cli\u003eKeyway damage\u003c\/li\u003e\n\u003cli\u003ePremature key wear\u003c\/li\u003e\n\u003cli\u003eDifficulty during assembly\u003c\/li\u003e\n\u003cli\u003eBinding\u003c\/li\u003e\n\u003cli\u003eComponent misalignment\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor compatible applications, use \u003cstrong\u003e539101177\u003c\/strong\u003e as the primary replacement reference rather than selecting generic key stock based solely on approximate dimensions.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eMechanical Power Transfer\u003c\/h2\u003e\n\u003cp\u003eShaft keys are commonly used where rotational force must pass from one mechanical component to another.\u003c\/p\u003e\n\u003cp\u003eA typical keyed connection consists of:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShaft → Square Key → Hub \/ Pulley \/ Gear\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eWhen the shaft rotates, the key bears against the sides of the corresponding keyways, allowing rotational force to be transferred to the attached component.\u003c\/p\u003e\n\u003cp\u003eA damaged key can interrupt or reduce this mechanical connection.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eSquare Key vs. Woodruff Key\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003e539101177\u003c\/strong\u003e should not be confused with a Woodruff key.\u003c\/p\u003e\n\u003cp\u003eA \u003cstrong\u003esquare key\u003c\/strong\u003e generally has a straight rectangular or square profile.\u003c\/p\u003e\n\u003cp\u003eA \u003cstrong\u003eWoodruff key\u003c\/strong\u003e typically has a semicircular profile and installs into a curved keyway machined into the shaft.\u003c\/p\u003e\n\u003cp\u003eThese designs are not automatically interchangeable.\u003c\/p\u003e\n\u003cp\u003eUse the exact OEM part number specified for the equipment.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eNot an Ignition Key\u003c\/h2\u003e\n\u003cp\u003eThe term \u003cstrong\u003e“key”\u003c\/strong\u003e can refer to several very different parts on outdoor power equipment.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003e539101177 is a mechanical 5mm square key\u003c\/strong\u003e, not:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAn ignition key\u003c\/li\u003e\n\u003cli\u003eStarter key\u003c\/li\u003e\n\u003cli\u003eSafety key\u003c\/li\u003e\n\u003cli\u003eSwitch key\u003c\/li\u003e\n\u003cli\u003eKey switch component\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIts purpose is mechanical engagement within a keyed shaft assembly.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eCommon Reasons for Replacement\u003c\/h2\u003e\n\u003cp\u003eReplacement of the \u003cstrong\u003e539101177 5mm Square Key\u003c\/strong\u003e may be appropriate if the original key has:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSheared\u003c\/li\u003e\n\u003cli\u003eCracked\u003c\/li\u003e\n\u003cli\u003eBroken\u003c\/li\u003e\n\u003cli\u003eBecome rounded\u003c\/li\u003e\n\u003cli\u003eDeveloped excessive wear\u003c\/li\u003e\n\u003cli\u003eBecome deformed\u003c\/li\u003e\n\u003cli\u003eSustained impact damage\u003c\/li\u003e\n\u003cli\u003eDeveloped corrosion\u003c\/li\u003e\n\u003cli\u003eBecome loose within the keyway\u003c\/li\u003e\n\u003cli\u003eBeen damaged during component removal\u003c\/li\u003e\n\u003cli\u003eBeen lost during equipment disassembly\u003c\/li\u003e\n\u003cli\u003eBecome unsuitable for reuse\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA sheared or damaged key may also indicate another mechanical problem within the equipment.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003ePossible Signs of a Damaged Shaft Key\u003c\/h2\u003e\n\u003cp\u003eDepending on its installation location, a damaged square key may contribute to:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eShaft rotating without properly driving the attached component\u003c\/li\u003e\n\u003cli\u003ePulley not rotating correctly\u003c\/li\u003e\n\u003cli\u003eGear not rotating with the shaft\u003c\/li\u003e\n\u003cli\u003eIntermittent mechanical engagement\u003c\/li\u003e\n\u003cli\u003eSlipping under load\u003c\/li\u003e\n\u003cli\u003eExcessive mechanical play\u003c\/li\u003e\n\u003cli\u003eRattling\u003c\/li\u003e\n\u003cli\u003eAbnormal vibration\u003c\/li\u003e\n\u003cli\u003eLoss of drivetrain function\u003c\/li\u003e\n\u003cli\u003eVisible movement between the shaft and hub\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese symptoms can also result from damaged shafts, pulleys, gears, bearings, hubs, or other drivetrain components.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKeyway Inspection\u003c\/h2\u003e\n\u003cp\u003eWhenever replacing \u003cstrong\u003e539101177\u003c\/strong\u003e, inspect both corresponding keyways.\u003c\/p\u003e\n\u003cp\u003eCheck the shaft keyway for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRounding\u003c\/li\u003e\n\u003cli\u003eBurrs\u003c\/li\u003e\n\u003cli\u003eCracks\u003c\/li\u003e\n\u003cli\u003eDistortion\u003c\/li\u003e\n\u003cli\u003eCorrosion\u003c\/li\u003e\n\u003cli\u003eExcessive wear\u003c\/li\u003e\n\u003cli\u003eImpact damage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlso inspect the mating component's keyway for the same conditions.\u003c\/p\u003e\n\u003cp\u003eInstalling a new key into a severely damaged keyway may not restore a secure mechanical connection.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eShaft Inspection\u003c\/h2\u003e\n\u003cp\u003eInspect the applicable shaft for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBending\u003c\/li\u003e\n\u003cli\u003eCracks\u003c\/li\u003e\n\u003cli\u003eScoring\u003c\/li\u003e\n\u003cli\u003eWorn mounting surfaces\u003c\/li\u003e\n\u003cli\u003eDamaged threads\u003c\/li\u003e\n\u003cli\u003eExcessive corrosion\u003c\/li\u003e\n\u003cli\u003eKeyway deformation\u003c\/li\u003e\n\u003cli\u003eExcessive mechanical play\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA damaged shaft should be repaired or replaced as appropriate before installing the new square key.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003ePulley, Gear or Hub Inspection\u003c\/h2\u003e\n\u003cp\u003eIf the key is used with a pulley, gear, hub, or similar component, inspect that part for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCracks\u003c\/li\u003e\n\u003cli\u003eWorn bore\u003c\/li\u003e\n\u003cli\u003eDamaged keyway\u003c\/li\u003e\n\u003cli\u003eDistortion\u003c\/li\u003e\n\u003cli\u003eExcessive play\u003c\/li\u003e\n\u003cli\u003eCorrosion\u003c\/li\u003e\n\u003cli\u003eHeat damage\u003c\/li\u003e\n\u003cli\u003eLoose fit on the shaft\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eA worn hub can repeatedly damage replacement keys.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eSheared Key Diagnosis\u003c\/h2\u003e\n\u003cp\u003eIf the original key has sheared, determine why before simply installing another one.\u003c\/p\u003e\n\u003cp\u003ePossible contributing factors can include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSudden impact\u003c\/li\u003e\n\u003cli\u003eSeized driven component\u003c\/li\u003e\n\u003cli\u003eDamaged bearing\u003c\/li\u003e\n\u003cli\u003eMisalignment\u003c\/li\u003e\n\u003cli\u003eLoose shaft-mounted component\u003c\/li\u003e\n\u003cli\u003eExcessive drivetrain load\u003c\/li\u003e\n\u003cli\u003eDamaged keyway\u003c\/li\u003e\n\u003cli\u003eIncorrect previous replacement key\u003c\/li\u003e\n\u003cli\u003eImproper assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCorrecting the underlying problem can help prevent premature failure of the replacement key.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eInstallation Considerations\u003c\/h2\u003e\n\u003cp\u003eBefore replacing \u003cstrong\u003e539101177\u003c\/strong\u003e:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eShut down the equipment completely.\u003c\/li\u003e\n\u003cli\u003eRemove the ignition key where applicable.\u003c\/li\u003e\n\u003cli\u003eDisconnect the spark plug or battery as appropriate.\u003c\/li\u003e\n\u003cli\u003eAllow moving and hot components to stop and cool.\u003c\/li\u003e\n\u003cli\u003eAccess the applicable shaft assembly.\u003c\/li\u003e\n\u003cli\u003eRemove the shaft-mounted component as required.\u003c\/li\u003e\n\u003cli\u003eRemove any remaining pieces of the original key.\u003c\/li\u003e\n\u003cli\u003eClean the shaft and keyways.\u003c\/li\u003e\n\u003cli\u003eInspect both keyways for damage.\u003c\/li\u003e\n\u003cli\u003ePosition the new \u003cstrong\u003e539101177 5mm Square Key\u003c\/strong\u003e correctly.\u003c\/li\u003e\n\u003cli\u003eAlign the mating component's keyway with the key.\u003c\/li\u003e\n\u003cli\u003eCarefully reinstall the pulley, gear, hub, or other component.\u003c\/li\u003e\n\u003cli\u003eReinstall applicable washers, spacers, retainers, and fasteners.\u003c\/li\u003e\n\u003cli\u003eTighten mounting hardware according to the equipment's service requirements.\u003c\/li\u003e\n\u003cli\u003eVerify proper component alignment.\u003c\/li\u003e\n\u003cli\u003eConfirm the assembly rotates or operates correctly before returning the equipment to service.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003chr\u003e\n\u003ch2\u003eInstallation Tips\u003c\/h2\u003e\n\u003cp\u003eDuring installation:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eKeep the key and keyway clean\u003c\/li\u003e\n\u003cli\u003eRemove dirt and debris before assembly\u003c\/li\u003e\n\u003cli\u003eMake sure the key sits correctly in the shaft keyway\u003c\/li\u003e\n\u003cli\u003eAlign the mating keyway before installing the component\u003c\/li\u003e\n\u003cli\u003eDo not force a misaligned component over the key\u003c\/li\u003e\n\u003cli\u003eDo not grind down the replacement key to make it fit\u003c\/li\u003e\n\u003cli\u003eDo not hammer excessively on the key\u003c\/li\u003e\n\u003cli\u003eDo not substitute undersized key stock\u003c\/li\u003e\n\u003cli\u003eInspect all retaining hardware before reassembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe shaft-mounted component should install correctly without damaging or displacing the key.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify compatibility with your exact equipment model, product number, serial number, and production revision before ordering.\u003c\/li\u003e\n\u003cli\u003eMatch \u003cstrong\u003epart number 539101177\u003c\/strong\u003e directly with the applicable Husqvarna OEM illustrated parts documentation.\u003c\/li\u003e\n\u003cli\u003eThe component is a \u003cstrong\u003e5mm square mechanical key\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThis is \u003cstrong\u003enot an ignition or starter key\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eThe exact installation location of \u003cstrong\u003e539101177 is equipment-model dependent\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eDo not assume every Husqvarna shaft assembly using a square key requires the same size.\u003c\/li\u003e\n\u003cli\u003eSquare keys can vary in width, height, length, material, and application.\u003c\/li\u003e\n\u003cli\u003eUse \u003cstrong\u003e539101177\u003c\/strong\u003e as the primary fitment reference.\u003c\/li\u003e\n\u003cli\u003eDo not substitute a Woodruff key.\u003c\/li\u003e\n\u003cli\u003eDo not select replacement key stock solely by visual similarity.\u003c\/li\u003e\n\u003cli\u003eDo not grind, file, shorten, or otherwise modify the key unless specifically required by an authorized service procedure.\u003c\/li\u003e\n\u003cli\u003eInspect the shaft keyway whenever replacing a damaged key.\u003c\/li\u003e\n\u003cli\u003eInspect the mating component's keyway for wear or distortion.\u003c\/li\u003e\n\u003cli\u003eA damaged keyway can cause premature failure of the replacement key.\u003c\/li\u003e\n\u003cli\u003eDetermine the cause if the original key has sheared.\u003c\/li\u003e\n\u003cli\u003eInspect associated bearings and drivetrain components for binding.\u003c\/li\u003e\n\u003cli\u003eVerify that the shaft-mounted component fits securely.\u003c\/li\u003e\n\u003cli\u003eReinstall all washers, spacers, retainers, and mounting hardware in their proper positions.\u003c\/li\u003e\n\u003cli\u003eMake sure all rotating components are correctly aligned before operation.\u003c\/li\u003e\n\u003cli\u003eShut off the engine and disconnect the spark plug or battery before servicing drivetrain components.\u003c\/li\u003e\n\u003cli\u003eKeep hands and tools clear of rotating components.\u003c\/li\u003e\n\u003cli\u003eReinstall all guards and covers before returning the equipment to operation.\u003c\/li\u003e\n\u003cli\u003eThis listing is for \u003cstrong\u003eone Husqvarna 539101177 5mm Square Key only\u003c\/strong\u003e unless otherwise specified. Shaft, pulley, gear, hub, bearings, washers, retainers, and other drivetrain components are sold separately unless explicitly included.\u003c\/li\u003e\n\u003cli\u003eMatch \u003cstrong\u003eHusqvarna 539101177\u003c\/strong\u003e with your equipment's OEM parts documentation before ordering to ensure proper fitment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Husqvarna","offers":[{"title":"Default Title","offer_id":53753349669227,"sku":"539101177","price":8.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0917\/9201\/5723\/files\/539101177.jpg?v=1787322377","url":"https:\/\/generalsprayers.com\/products\/husqvarna-539101177-5mm-square-key-genuine-oem-replacement-equipment-key","provider":"GeneralSprayers","version":"1.0","type":"link"}