{"product_id":"castair-replacement-industrial-v-type-belt-section-b-length-77-3-b77","title":"Castair Replacement Industrial V-Type Belt Section B Length 77\" 3-B77","description":"\u003cp\u003eThe Castair 3-B77 is a Section B, 77-inch industrial V-type drive belt — the specified replacement belt for Cast Air compressor systems that use this length. Belt-drive compressors are only as reliable as the belt transmitting power from the motor to the pump head. When that belt wears out, you want the right replacement ready to go.\u003c\/p\u003e\u003ch2\u003eWhat This Belt Is\u003c\/h2\u003e\u003cp\u003eThe B section is the industry-standard mid-width V-belt profile (21\/32\" wide x 13\/32\" deep cross-section). At 77 inches outside circumference, this belt fits Cast Air compressor configurations with the center-distance and pulley sizes that match this length. Using an incorrect length — even 2 inches off — can prevent proper tensioning or cause premature belt walk and failure.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSection B profile:\u003c\/strong\u003e Fits all standard B-groove sheaves and compressor pulleys\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e77-inch outside circumference:\u003c\/strong\u003e OEM-specified length for applicable Cast Air compressor models\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContinuous-duty construction:\u003c\/strong\u003e Handles the repeated load cycles of industrial compressor operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eV-groove wedge action:\u003c\/strong\u003e Positive drive engagement — belt seats deeper under load for reliable power transfer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCastair OEM part:\u003c\/strong\u003e Engineered to the original specification, not an aftermarket approximation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt section:\u003c\/strong\u003e B\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal outside circumference:\u003c\/strong\u003e 77 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-section width:\u003c\/strong\u003e 21\/32 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCross-section height:\u003c\/strong\u003e 13\/32 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt type:\u003c\/strong\u003e Classical V-belt (non-cogged)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Cast Air \/ Castair\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e 3-B77\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInspection and Replacement Intervals\u003c\/h2\u003e\u003cp\u003eInspect your compressor drive belt every 500 operating hours or at each scheduled maintenance interval. Look for cracking along the outer surface, glazing on the sidewalls, fraying at the edges, or any visible separation between cord layers. A belt that has stretched to the limit of tensioner adjustment is also due for replacement — do not try to get more life out of it by shimming the motor or adding spacers.\u003c\/p\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCast Air \/ Castair compressors requiring a Section B 77-inch replacement drive belt\u003c\/li\u003e\n\u003cli\u003eIndustrial belt-drive systems with B-groove pulley configurations\u003c\/li\u003e\n\u003cli\u003eAutomotive service shops, fleet maintenance, manufacturing, and industrial facilities\u003c\/li\u003e\n\u003cli\u003ePreventive maintenance stock — avoid unplanned downtime by keeping a spare on hand\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhy Buy From OEM Diagnostic Tools?\u003c\/h2\u003e\u003cp\u003eWe have been serving shops and industrial buyers with compressor parts and equipment since 2016. Our focus is getting you the right part — not a close substitute. Cast Air replacement belts are stocked and ready to ship. Free shipping on qualifying orders. Call us and we will verify the correct belt for your Castair model before your order ships.\u003c\/p\u003e\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":53342506287317,"sku":"3-B77","price":42.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/beltb_fa3be71b-be2c-4a2b-9454-7037ddc8aae3.jpg?v=1772652505","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-replacement-industrial-v-type-belt-section-b-length-77-3-b77","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}