{"product_id":"a40-4l420","title":"A40\/4L420 HVAC V-Belt — Replaces Lennox 25W62, Greenheck 345041","description":"\u003cstyle\u003e\n.xp{font-family:Arial,Helvetica,sans-serif;color:#1b1b1b;line-height:1.55;max-width:1100px;margin:auto}.xp *{box-sizing:border-box}.xp .hero{position:relative;overflow:hidden;border-radius:12px;padding:22px 28px;margin-bottom:18px;color:#fff;background:#111;isolation:isolate}.xp .hero:before{content:\"\";position:absolute;inset:0;z-index:-2;background:url('https:\/\/cdn.shopify.com\/s\/files\/1\/0897\/7783\/2225\/files\/4444444444444444.png?v=1777040489') center\/cover no-repeat}.xp .hero:after{content:\"\";position:absolute;inset:0;z-index:-1;background:linear-gradient(135deg,rgba(0,0,0,.88) 55%,rgba(0,0,0,.48))}.xp .label{display:inline-block;background:#e60000;color:#fff;font-weight:800;font-size:11px;letter-spacing:.05em;padding:6px 10px;border-radius:20px;margin-bottom:9px}.xp .hero h2{font-size:clamp(22px,3vw,34px);line-height:1.1;margin:0 0 8px;color:#fff!important}.xp .hero p{margin:0;color:#fff!important}.xp .specs{display:flex;flex-wrap:wrap;gap:7px;margin-top:11px}.xp .specs span{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);padding:5px 8px;border-radius:7px;font-size:12px;font-weight:700}.xp h2{font-size:27px;margin:28px 0 10px;color:#111}.xp .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px;margin:16px 0}.xp .card{border:1px solid #ddd;border-radius:10px;padding:16px;background:#fff}.xp .card strong{display:block;color:#e60000;margin-bottom:4px}.xp ul,.xp ol{padding-left:22px}.xp li{margin:6px 0}.xp .fit{border:2px solid #e60000;background:#fff7f7;padding:17px 18px;border-radius:10px;margin:20px 0}.xp .tip{border-left:5px solid #e60000;background:#f6f6f6;padding:16px 18px;border-radius:9px;margin:22px 0}.xp .note{font-size:14px;color:#444;background:#fafafa;border:1px solid #e5e5e5;border-radius:9px;padding:14px}@media(max-width:640px){.xp .hero{padding:19px}.xp .hero h2{font-size:24px}.xp h2{font-size:24px}}\n\u003c\/style\u003e\n\u003cdiv class=\"xp\"\u003e\n\u003csection class=\"hero\"\u003e\n\u003cdiv class=\"label\"\u003eBELT SLIPPING, SQUEALING OR WORN?\u003c\/div\u003e\n\u003ch2\u003eA40\/4L420 HVAC V-Belt — Restores Blower Speed \u0026amp; Airflow\u003c\/h2\u003e\n\u003cp\u003e42-inch outside-length, 1\/2-inch wrapped drive belt with verified OEM and manufacturer cross-reference data.\u003c\/p\u003e\n\u003cdiv class=\"specs\"\u003e\n\u003cspan\u003eA40 \/ 4L420\u003c\/span\u003e\u003cspan\u003e42\" Outside Length\u003c\/span\u003e\u003cspan\u003e1\/2\" Top Width\u003c\/span\u003e\u003cspan\u003e40° Profile\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\n\u003cdiv class=\"fit\"\u003e\n\u003cstrong\u003eEquipment Fitment:\u003c\/strong\u003e No model-level fitment was added because the audited manufacturer pages identify this as a broad blower-belt size without exposing a reliable model list. Match by the complete A40\/4L420 marking, profile and length.\u003c\/div\u003e\n\n\u003ch2\u003eVerified Cross-Reference Information\u003c\/h2\u003e\n\u003cdiv class=\"grid\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eIndustry Numbers\u003c\/strong\u003eA40, 4L420\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eLennox Numbers\u003c\/strong\u003e25W62, 100245-17, 25P09\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eGreenheck\u003c\/strong\u003e345041 (A40), 345069 (4L420)\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eGates Classical\u003c\/strong\u003eA40, 9002-2040\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eGates FHP\u003c\/strong\u003e6842 \/ 4L420K\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEquivalent vs. Alternative Belts\u003c\/h2\u003e\n\u003cdiv class=\"grid\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eDimensional FHP Equivalent\u003c\/strong\u003eGates 6842 \/ 4L420K\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eCogged Performance Alternative\u003c\/strong\u003eAX40 — raw-edge cogged construction; not identical to a wrapped A40\/4L420\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"note\"\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e A belt can share the same nominal size while using a different cover, cord, compound or cogged construction. Match the original duty requirement as well as the section and length.\u003c\/p\u003e\n\n\u003ch2\u003eSize \u0026amp; Application Data\u003c\/h2\u003e\n\u003cdiv class=\"grid\"\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eOutside Length\u003c\/strong\u003e42\" \/ 1067 mm\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eTop Width\u003c\/strong\u003e1\/2\" \/ 12.7 mm\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eNominal Height\u003c\/strong\u003eApproximately 5\/16\" to 11\/32\", depending on manufacturer specification\u003c\/div\u003e\n\u003cdiv class=\"card\"\u003e\n\u003cstrong\u003eTypical Uses\u003c\/strong\u003eHVAC blowers, rooftop units, ventilation fans, air handlers, pumps and industrial drives\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eCommon Problems This Belt May Correct\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eStartup squeal, chirp or belt slip\u003c\/li\u003e\n\u003cli\u003eWeak airflow or a blower running below normal speed\u003c\/li\u003e\n\u003cli\u003eBlack belt dust around the sheaves\u003c\/li\u003e\n\u003cli\u003eA cracked, glazed, stretched, frayed or hardened belt\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCheck Before Ordering\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRead the complete number printed on the old belt whenever possible.\u003c\/li\u003e\n\u003cli\u003eConfirm the 1\/2-inch A\/4L profile and 42-inch outside-length designation.\u003c\/li\u003e\n\u003cli\u003eInspect both sheaves for worn, widened, polished or damaged grooves.\u003c\/li\u003e\n\u003cli\u003eCheck shaft alignment, bearing drag and the tensioning system.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"tip\"\u003e\n\u003cstrong\u003ePro Tip:\u003c\/strong\u003e A new belt will not permanently stop noise caused by worn sheaves, misalignment or failing bearings. Correct the drive problem first, then set final tension to the equipment specification.\u003c\/div\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003eDisconnect and lock out electrical power.\u003c\/li\u003e\n\u003cli\u003eRelease belt tension according to the service instructions.\u003c\/li\u003e\n\u003cli\u003eDo not pry the belt over a pulley; create enough slack.\u003c\/li\u003e\n\u003cli\u003eClean and align the sheaves, then set specified tension.\u003c\/li\u003e\n\u003cli\u003eRotate by hand, reinstall guards, restore power and test.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre A40 and 4L420 interchangeable?\u003c\/strong\u003e\u003cbr\u003eThey are commonly paired as the same nominal 1\/2-inch, 42-inch size. Construction and duty rating can still differ by product line.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan AX40 replace this belt?\u003c\/strong\u003e\u003cbr\u003eAX40 is a related cogged performance alternative, not identical wrapped construction. Verify the equipment permits the change.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003e✓ Model-Specific Repair Pages\u003c\/h2\u003e\n\u003cdiv class=\"model-link-grid\"\u003e\n  \u003ca href=\"\/en-us\/pages\/about-us\" style=\"display:inline-block;border:1px solid #cc0000;border-radius:20px;padding:5px 14px;font-size:13px;color:#cc0000;text-decoration:none;margin:4px;\"\u003eFrigidaire 1 Dishwasher Parts \u0026amp; Repair Guide\u003c\/a\u003e\n\u003c\/div\u003e","brand":"XPart Supply","offers":[{"title":"OEM Genuine","offer_id":51222587769121,"sku":"A40-4L420","price":33.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0897\/7783\/2225\/files\/drive_belts.png?v=1785290132","url":"https:\/\/xpartsupply.com\/en-us\/products\/a40-4l420","provider":"XPart Supply Ltd.","version":"1.0","type":"link"}