{"product_id":"4939472-genuine-cummins®-onan-hose-flexible","title":"4939472 | Genuine Cummins® Onan HOSE,FLEXIBLE","description":"\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e: Onan HOSE,FLEXIBLE\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e: New\u003cbr\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: 4939472\u003cbr\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e: Cummins\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Fitment\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-path-to-node=\"3\"\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003e1. Compatible Engine Families\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\"\u003eThis component is designed to integrate into Cummins and Cummins Onan medium-duty engines and high-capacity power generation systems. It is primarily used on:\u003c\/p\u003e\n\u003cul data-path-to-node=\"5\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,0,0\"\u003e\u003cb data-path-to-node=\"5,0,0\" data-index-in-node=\"0\"\u003eCummins B-Series \/ ISB \/ QSB Series\u003c\/b\u003e (3.9L, 4.5L, 5.9L, and 6.7L industrial and marine diesel engines)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"5,1,0\"\u003e\u003cb data-path-to-node=\"5,1,0\" data-index-in-node=\"0\"\u003eCummins Onan Commercial \u0026amp; Industrial Generator Sets\u003c\/b\u003e (Heavy-duty diesel power generation platforms)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-path-to-node=\"6\"\u003e\u003cb data-path-to-node=\"6\" data-index-in-node=\"0\"\u003e2. Common Applications \u0026amp; Vehicle Types\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003eBecause this flexible hose is built to survive high-vibration commercial environments, it is utilized across various equipment configurations:\u003c\/p\u003e\n\u003cul data-path-to-node=\"8\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,0,0\"\u003e\u003cb data-path-to-node=\"8,0,0\" data-index-in-node=\"0\"\u003eCommercial Mobile \u0026amp; RV Generators:\u003c\/b\u003e High-output Onan diesel generators installed in Class A motorhomes, command centers, and mobile medical vehicles (often acting as a fuel return line or a component of the coolant\/breather bypass system).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,1,0\"\u003e\u003cb data-path-to-node=\"8,1,0\" data-index-in-node=\"0\"\u003eIndustrial \u0026amp; Agricultural Machinery:\u003c\/b\u003e Construction equipment, excavators, air compressors, and agricultural tractors powered by Cummins QSB engines.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"8,2,0\"\u003e\u003cb data-path-to-node=\"8,2,0\" data-index-in-node=\"0\"\u003eMarine Power Systems:\u003c\/b\u003e Auxiliary marine generators and compact marine propulsion engines where flexible, pressure-resistant fluid lines are mandated for safety against hull vibrations.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp data-path-to-node=\"0\"\u003eThe Onan Flexible Hose\u003cb data-path-to-node=\"0\" data-index-in-node=\"4\"\u003e \u003c\/b\u003eis an original equipment manufacturer (OEM) nonmetallic fluid transfer line specifically engineered to carry oil or fuel inside industrial engine layouts.\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-path-to-node=\"3\"\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003e1. What is it?\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\"\u003eThis part is a specialized high-durability rubber or synthetic blend \u003cb data-path-to-node=\"4\" data-index-in-node=\"69\"\u003eFuel\/Oil Tube Hose\u003c\/b\u003e. It features a flexible, reinforced multi-layer construction that allows it to safely carry volatile automotive fluids without cracking, kink-collapse, or chemical degradation over time.\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003e\u003cb data-path-to-node=\"5\" data-index-in-node=\"0\"\u003e2. Core Functions\u003c\/b\u003e\u003c\/p\u003e\n\u003cul data-path-to-node=\"6\"\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,0,0\"\u003e\u003cb data-path-to-node=\"6,0,0\" data-index-in-node=\"0\"\u003eVibration-Isolated Fluid Transport:\u003c\/b\u003e In heavy-duty generator and industrial truck applications, engine blocks vibrate intensely under load. This hose acts as a flexible bridge between shaking engine ports and stationary frames or filters, preventing rigid lines from snapping under stress.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,1,0\"\u003e\u003cb data-path-to-node=\"6,1,0\" data-index-in-node=\"0\"\u003eOil\/Fuel Feed and Return:\u003c\/b\u003e Depending on the exact system diagram, it is cataloged as a high-integrity oil tube or a QSB series fuel line loop. It keeps fluid flowing consistently at targeted operating temperatures and internal pressures.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp data-path-to-node=\"6,2,0\"\u003e\u003cb data-path-to-node=\"6,2,0\" data-index-in-node=\"0\"\u003eLong-Term Heat Resistance:\u003c\/b\u003e Formulated from specialized elastomers, it resists the extreme under-hood baking temperatures common to enclosed silent-series RV and commercial utility generators.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSigns of Faulty\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-path-to-node=\"3\"\u003e\u003cb data-path-to-node=\"3\" data-index-in-node=\"0\"\u003e1. External Fluid Wetness or Visible Leaks\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"4\"\u003eThe most immediate sign is wetness or active dripping along the body of the hose or at its connection fittings. If used as an oil supply line, you will notice dark residue; if used as a fuel loop, you will see a damp sheen accompanied by a strong diesel odor.\u003c\/p\u003e\n\u003cp data-path-to-node=\"5\"\u003e\u003cb data-path-to-node=\"5\" data-index-in-node=\"0\"\u003e2. Surface Cracking, Dry Rot, or Brittleness\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"6\"\u003eOver time, constant thermal cycles dry out the rubber compound. During a physical inspection, if you bend the hose slightly and see microscopic \"alligator\" cracks, or if the material feels rock-hard and brittle rather than pliable, the structural integrity is compromised and it is on the verge of bursting.\u003c\/p\u003e\n\u003cp data-path-to-node=\"7\"\u003e\u003cb data-path-to-node=\"7\" data-index-in-node=\"0\"\u003e3. Bulging, Swelling, or Blistering\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"8\"\u003eIf the inner lining fails, fluid under pressure can bypass the reinforcement layers and push outward against the outer rubber jacket. This creates an uncharacteristic \"pouch,\" bulge, or blister. A swollen hose is a ticking time bomb that can rupture at any moment.\u003c\/p\u003e\n\u003cp data-path-to-node=\"9\"\u003e\u003cb data-path-to-node=\"9\" data-index-in-node=\"0\"\u003e4. Fuel System Air Intrusion (If used as a Fuel Line)\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"10\"\u003eIf the hose develops a pinhole leak or loses its airtight seal at the crimps, it may not leak fluid outward when the engine is off, but it will suck air \u003ci data-path-to-node=\"10\" data-index-in-node=\"153\"\u003einward\u003c\/i\u003e while the engine runs. This introduces air bubbles into the high-pressure fuel system, causing engine stuttering, rough idle, or hard starting.\u003c\/p\u003e\n\u003cp data-path-to-node=\"11\"\u003e\u003cb data-path-to-node=\"11\" data-index-in-node=\"0\"\u003e5. Low Fluid Pressure Alerts\u003c\/b\u003e\u003c\/p\u003e\n\u003cp data-path-to-node=\"12\"\u003eA severely leaking or collapsed flexible hose can restrict the required volume of fluid reaching its destination. This can trip low fuel pressure warnings or engine oil pressure drops on the generator\/vehicle control panel.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer information\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eCummins®\u003c\/strong\u003e is a worldwide leader in the production of engines, agricultural components, and other power-generating devices for various industries, including medium and heavy duty trucks, light commercial vehicles, buses, agriculture, and construction. Founded in 1919, this company stays true to its mission of making people's lives better by continuously improving its product line-up and introducing new solutions for a more prosperous world. Its core values—integrity, diversity and inclusion, excellence, caring, and teamwork—are what make it a successful company today—a worldwide leader with a network of more than 600 company-owned and independent distributors and almost 6,000 dealers in approximately 190 countries.\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003eFirst Truck Parts offers a \u003cstrong\u003e365-days\u003c\/strong\u003e \u003cstrong\u003ewarranty\u003c\/strong\u003e for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.\u003c\/p\u003e","brand":"Cummins®","offers":[{"title":"Default Title","offer_id":48834229797108,"sku":"4939472","price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/1479\/5764\/files\/Hc33dbc70f57741ff9c0836ceee963ad6Q.jpg?v=1783541001","url":"https:\/\/firsttruckparts.com\/products\/4939472-genuine-cummins%c2%ae-onan-hose-flexible","provider":"First Truck Parts","version":"1.0","type":"link"}