{"product_id":"dayco-oe-fan-belt-tensioner-volvo-d13-mack-mp8-2018-volvo-21714847-dayco-89935-day89935","title":"Dayco OE Fan Belt Tensioner - Volvo D13 \/ Mack MP8 2018+ - Volvo 21714847 Dayco 89935 DAY89935","description":"\u003cp\u003eRestore proper tension across the front accessory drive with this \u003cstrong\u003eDayco OE Fan Belt Tensioner\u003c\/strong\u003e distributed by FleetPro Parts \u0026amp; Tires. The \u003cstrong\u003eDayco 89935\u003c\/strong\u003e is an OE-quality automatic accessory drive belt tensioner for \u003cstrong\u003eVolvo D13\u003c\/strong\u003e and \u003cstrong\u003eMack MP8\u003c\/strong\u003e engines, and it maintains constant spring tension across the serpentine drive so the belt tracks correctly through the full RPM range. A worn tensioner shows up as belt squeal on cold start, belt flutter or chirp, accelerated belt wear, and a noisy or wobbling pulley. We stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for fleets, diesel repair shops, and owner-operators nationwide.\u003c\/p\u003e\n\n\u003ch2\u003eConstant Spring Tension: The Dayco 89935 Advantage\u003c\/h2\u003e\n\n\u003cp\u003eThis is an \u003cstrong\u003eautomatic spring-loaded tensioner assembly\u003c\/strong\u003e built around a \u003cstrong\u003eflat coil spring\u003c\/strong\u003e, a design specified for reduced bearing load and quieter operation. The \u003cstrong\u003e74 mm pulley\u003c\/strong\u003e is \u003cstrong\u003e46.3 mm wide\u003c\/strong\u003e and turns \u003cstrong\u003ecounter-clockwise\u003c\/strong\u003e, matched to the \u003cstrong\u003e12-rib serpentine (K-section)\u003c\/strong\u003e belt these engines run. Get the pulley width and the rib count right and the belt sits square in the grooves; get them wrong and you shred belt edges.\u003c\/p\u003e\n\n\u003cp\u003eIt installs on the \u003cstrong\u003efront accessory drive\u003c\/strong\u003e, pivoting against the serpentine belt that turns the alternator, water pump and fan hub, which is why a failing tensioner is never just a noise complaint. At FleetPro Parts \u0026amp; Tires, we know a belt that slips at the water pump becomes a cooling problem three miles later. This Dayco unit is a direct replacement for highly searched industry numbers including \u003cstrong\u003eVolvo 21714847\u003c\/strong\u003e, \u003cstrong\u003e21461221\u003c\/strong\u003e, 21417563, 20582557, 20582558 and 20860873.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eVehicle Fitment \u0026amp; Compatibility\u003c\/h3\u003e\n\u003cp\u003eThis OE-quality belt tensioner is intended for the following commercial applications:\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEngine:\u003c\/strong\u003e Volvo D13 and Mack MP8, 2018+\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVolvo:\u003c\/strong\u003e VNL, VNM, VNR and VHD series\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMack:\u003c\/strong\u003e Anthem, Pinnacle, Granite, CHU, CXU and GU series\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Front accessory drive, against the serpentine belt driving the alternator, water pump and fan hub\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComponent Group:\u003c\/strong\u003e Engine Accessory Drive \/ Belts \u0026amp; Tensioners\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eDirect Replacement \u0026amp; Cross-Reference Numbers:\u003c\/h3\u003e\n\u003cp\u003e\u003cem\u003eThis Dayco OE tensioner serves as a direct replacement for the following part numbers:\u003c\/em\u003e\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDayco Interchange:\u003c\/strong\u003e 89935\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eVolvo Interchange:\u003c\/strong\u003e 20582557, 20582558, 20860873, 21417563, 21461221, 21714847\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eAdditional Interchange:\u003c\/strong\u003e 22674901, 24201752\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFleetPro Part #:\u003c\/strong\u003e DAY89935\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Automatic Spring-Loaded Belt Tensioner Assembly\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBelt Design:\u003c\/strong\u003e 12-Rib Serpentine (K-Section)\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePulley Diameter:\u003c\/strong\u003e 74 mm\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePulley Width:\u003c\/strong\u003e 46.3 mm\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRotation:\u003c\/strong\u003e Counter-clockwise\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSpring:\u003c\/strong\u003e Flat coil spring, for reduced bearing load and quieter operation\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGrade:\u003c\/strong\u003e OE\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 1-Year FleetPro Warranty\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eProduct Level:\u003c\/strong\u003e OEM\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Dayco (Distributed by FleetPro Parts \u0026amp; Tires)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Dayco","offers":[{"title":"Default Title","offer_id":43024031842375,"sku":"DAY89935","price":155.76,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/8035\/2583\/files\/image_1920_1184a260-316e-44e4-a719-1c2fe330697d.jpg?v=1785427797","url":"https:\/\/fleetpropt.com\/products\/dayco-oe-fan-belt-tensioner-volvo-d13-mack-mp8-2018-volvo-21714847-dayco-89935-day89935","provider":"FLEETPRO PARTS \u0026 TIRES","version":"1.0","type":"link"}