{"product_id":"castair-replacement-motor-hub-1-3-8-shaft-lx138","title":"Castair Replacement Motor Hub 1 3\/8\" Shaft LX138","description":"\u003cp\u003eThe Castair Replacement Motor Hub with 1-3\/8\" Shaft (LX138) is the motor hub for Cast Air compressor units that use a larger 1-3\/8\" diameter motor shaft. This is the largest shaft size in the standard LX series, typically found on higher-horsepower Cast Air compressor models where a bigger motor — and therefore a larger output shaft — drives the pump assembly. Verify your shaft diameter with calipers before ordering. A 1-3\/8\" shaft measures 1.375\" in decimal — this hub is machined specifically for that size.\u003c\/p\u003e\n\n\u003ch3\u003eWhat the Motor Hub Does\u003c\/h3\u003e\n\u003cp\u003eOn a belt-driven compressor, the motor hub is the component that mounts to the motor shaft and carries the drive sheave (pulley) that transfers power to the compressor pump via V-belt. On direct-drive configurations, it may serve as the coupling interface. Either way, it's a high-stress part — it takes the full torque load every time the motor starts under load. When the hub bore wears loose on the shaft, or the hub itself cracks from fatigue, the symptoms show up as vibration, belt alignment problems, and eventually a compressor that won't run correctly.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e1-3\/8\" Shaft Bore:\u003c\/strong\u003e Fits motor output shafts measuring 1.375\" in diameter — the largest standard size in the LX series\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCast Air OEM Part:\u003c\/strong\u003e Manufactured to Cast Air's specifications for correct fit on compatible compressor models\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecision Machined Bore:\u003c\/strong\u003e Proper tolerance fit prevents shaft slop and keeps the drive assembly running concentric\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect Replacement:\u003c\/strong\u003e No machining or modification required for compatible Cast Air units\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e LX138\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShaft Diameter:\u003c\/strong\u003e 1-3\/8\" (1.375\")\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Replacement Motor Hub\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Cast Air\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrice:\u003c\/strong\u003e $19.25\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Manufacturer's product page was unavailable at time of writing. Confirm compatibility with your specific Cast Air unit before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhen You Need This Part\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMotor hub shows cracking, bore wear, or visible damage\u003c\/li\u003e\n  \u003cli\u003eCompressor produces unusual vibration or noise, particularly at startup under load\u003c\/li\u003e\n  \u003cli\u003eBelt keeps going out of alignment despite correct tension and sheave alignment\u003c\/li\u003e\n  \u003cli\u003eMotor replacement requires a hub matched to the new motor's shaft size\u003c\/li\u003e\n  \u003cli\u003ePreventive maintenance on a high-hour compressor before the hub fails in service\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eLX Series Hub Lineup\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLX58\u003c\/strong\u003e — 5\/8\" shaft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLX78\u003c\/strong\u003e — 7\/8\" shaft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLX100\u003c\/strong\u003e — 1\" shaft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLX118\u003c\/strong\u003e — 1-1\/8\" shaft\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLX138\u003c\/strong\u003e — 1-3\/8\" shaft (this part)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From OEM Diagnostic Tools?\u003c\/h3\u003e\n\u003cp\u003eWe stock the complete Cast Air LX motor hub series. When your compressor goes down, you don't have time to chase parts across three vendors. We've been sourcing Cast Air replacement components for shops and industrial customers since 2016. Free shipping on qualifying orders. Call us with your compressor model and we'll confirm the right hub before you order.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342571364565,"sku":"LX138","price":35.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/CastairReplacementAirCompressorMotorHub.png?v=1772652731","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-replacement-motor-hub-1-3-8-shaft-lx138","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}