{"product_id":"sheave-door-cable-roller-large-2-5","title":"2.5\" Door Cable Relating Sheave","description":"\u003cp data-path-to-node=\"1\"\u003eIn the Canadian elevator industry, the \u003cb data-path-to-node=\"1\" data-index-in-node=\"39\"\u003e2.5-inch large door cable roller\u003c\/b\u003e typically refers to the \u003cb data-path-to-node=\"1\" data-index-in-node=\"96\"\u003eRelating Cable Sheave\u003c\/b\u003e found on \u003cb data-path-to-node=\"1\" data-index-in-node=\"127\"\u003eDover\u003c\/b\u003e or \u003cb data-path-to-node=\"1\" data-index-in-node=\"136\"\u003eMAC\u003c\/b\u003e door operators. This part is essential for synchronizing the movement of fast and slow door panels.\u003c\/p\u003e\n\u003cp data-path-to-node=\"2\"\u003eWhile hanger rollers (the wheels the door sits on) are larger, this 2.5-inch aluminum sheave is specifically designed to guide the 1\/8\" or 3\/32\" \u003cb data-path-to-node=\"2\" data-index-in-node=\"145\"\u003erelating cable\u003c\/b\u003e.\u003c\/p\u003e\n\u003cp data-path-to-node=\"3\"\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003eSpecifications\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"4\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,0,0\"\u003e\u003cb data-path-to-node=\"4,0,0\" data-index-in-node=\"0\"\u003eNominal Diameter:\u003c\/b\u003e 2.5\"\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,1,0\"\u003e\u003cb data-path-to-node=\"4,1,0\" data-index-in-node=\"0\"\u003eActual Outside Diameter (OD):\u003c\/b\u003e ~2.875\" (2-7\/8\")\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,2,0\"\u003e\u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"0\"\u003eBore:\u003c\/b\u003e \u003cb data-path-to-node=\"4,2,0\" data-index-in-node=\"6\"\u003e0.6693\" (17mm)\u003c\/b\u003e — Designed to fit the standard 6203-series precision-sealed bearings.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,3,0\"\u003e\u003cb data-path-to-node=\"4,3,0\" data-index-in-node=\"0\"\u003eMaterial:\u003c\/b\u003e Machined Aluminum (High Strength)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,4,0\"\u003e\u003cb data-path-to-node=\"4,4,0\" data-index-in-node=\"0\"\u003eGroove Type:\u003c\/b\u003e Deep \"V\" or \"U\" groove for aircraft-grade relating cables.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"4,5,0\"\u003e\u003cb data-path-to-node=\"4,5,0\" data-index-in-node=\"0\"\u003eOEM Reference:\u003c\/b\u003e Dover \u003cb data-path-to-node=\"4,5,0\" data-index-in-node=\"21\"\u003eDW-13\u003c\/b\u003e or MAC \u003cb data-path-to-node=\"4,5,0\" data-index-in-node=\"34\"\u003eP-31341\u003c\/b\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-path-to-node=\"5\"\u003e\n\u003ch3 data-path-to-node=\"6\"\u003e\u003cb data-path-to-node=\"6\" data-index-in-node=\"0\"\u003eCritical Field Insights\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul data-path-to-node=\"7\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,0,0\"\u003e\u003cb data-path-to-node=\"7,0,0\" data-index-in-node=\"0\"\u003eThe \"Large\" Distinction:\u003c\/b\u003e Most door headers use two sheaves for the relating cable: a \u003cb data-path-to-node=\"7,0,0\" data-index-in-node=\"85\"\u003e2.5\" Large Sheave\u003c\/b\u003e and a smaller 2\" idler. The 2.5\" sheave is the primary guide that handles the most tension and high-speed rotation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,1,0\"\u003e\u003cb data-path-to-node=\"7,1,0\" data-index-in-node=\"0\"\u003eBearing Failure:\u003c\/b\u003e Because this sheave spins at high speeds during every door cycle, the internal bearing is a frequent failure point. Technicians often hear a high-pitched \"squeal\" or \"whine\" when this part begins to fail.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,2,0\"\u003e\u003cb data-path-to-node=\"7,2,0\" data-index-in-node=\"0\"\u003eCable Sawing:\u003c\/b\u003e If the sheave becomes misaligned or the bearing seizes, the steel relating cable will \"saw\" into the aluminum groove. This creates sharp burrs that will eventually shred the cable, leading to a synchronization failure where one door panel moves while the other stays still.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"7,3,0\"\u003e\u003cb data-path-to-node=\"7,3,0\" data-index-in-node=\"0\"\u003eMaterial Upgrade:\u003c\/b\u003e For high-traffic Canadian buildings (like hospitals or transit hubs), these are often replaced with \u003cb data-path-to-node=\"7,3,0\" data-index-in-node=\"118\"\u003eNylatron\u003c\/b\u003e or \u003cb data-path-to-node=\"7,3,0\" data-index-in-node=\"130\"\u003eheavy-duty polyurethane\u003c\/b\u003e versions to reduce noise and extend the life of the relating cable.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-path-to-node=\"8\"\u003e\u003cb data-path-to-node=\"8\" data-index-in-node=\"0\"\u003eField Inspection Tip\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp data-path-to-node=\"9\"\u003eWhen you are replacing this 2.5\" sheave, \u003cb data-path-to-node=\"9\" data-index-in-node=\"41\"\u003ealways check the cable tension\u003c\/b\u003e. A loose cable can jump out of the groove and jam between the sheave and the mounting bracket, which often bends the bracket or snaps the cable.\u003c\/p\u003e","brand":"R.A.M. Parts","offers":[{"title":"Default Title","offer_id":48163028861080,"sku":null,"price":0.0,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/4369\/5000\/files\/rn-image_picker_lib_temp_d4e10b92-35ee-44b4-aa00-ed08820d9a76.jpg?v=1772054819","url":"https:\/\/parts4rem.ca\/products\/sheave-door-cable-roller-large-2-5","provider":"Parts4REM","version":"1.0","type":"link"}