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Dayco OE Fan Belt Tensioner - Volvo D13 / Mack MP8 2018+ - Volvo 21714847 Dayco 89935 DAY89935
Dayco OE Fan Belt Tensioner - Volvo D13 / Mack MP8 2018+ - Volvo 21714847 Dayco 89935 DAY89935
Dayco

Dayco OE Fan Belt Tensioner - Volvo D13 / Mack MP8 2018+ - Volvo 21714847 Dayco 89935 DAY89935

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SKU: DAY89935
$155.76
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Fitment

Fits these trucks

Volvo D13 and Mack MP8 engines, 2018+Volvo VNL, VNM, VNR and VHD seriesMack Anthem, Pinnacle, Granite, CHU, CXU and GU seriesFront accessory drive - serpentine belt tensioner
Always confirm your year, make & model before ordering.
Part numbers

OEM & interchange numbers

9 cross-refs
Dayco 89935 Volvo 21714847 Volvo 21461221 Volvo 21417563 Volvo 20582558 Volvo 20582557 Volvo 20860873 24201752 22674901
Direct 1-to-1 replacement for every number above. Tap any number to copy.
Overview

Restore proper tension across the front accessory drive with this Dayco OE Fan Belt Tensioner distributed by FleetPro Parts & Tires. The Dayco 89935 is an OE-quality automatic accessory drive belt tensioner for Volvo D13 and Mack MP8 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.

Constant Spring Tension: The Dayco 89935 Advantage

This is an automatic spring-loaded tensioner assembly built around a flat coil spring, a design specified for reduced bearing load and quieter operation. The 74 mm pulley is 46.3 mm wide and turns counter-clockwise, matched to the 12-rib serpentine (K-section) 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.

It installs on the front accessory drive, 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 & 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 Volvo 21714847, 21461221, 21417563, 20582557, 20582558 and 20860873.

Vehicle Fitment & Compatibility

This OE-quality belt tensioner is intended for the following commercial applications:

  • Engine: Volvo D13 and Mack MP8, 2018+
  • Volvo: VNL, VNM, VNR and VHD series
  • Mack: Anthem, Pinnacle, Granite, CHU, CXU and GU series
  • Position: Front accessory drive, against the serpentine belt driving the alternator, water pump and fan hub
  • Component Group: Engine Accessory Drive / Belts & Tensioners

Direct Replacement & Cross-Reference Numbers:

This Dayco OE tensioner serves as a direct replacement for the following part numbers:

  • Dayco Interchange: 89935
  • Volvo Interchange: 20582557, 20582558, 20860873, 21417563, 21461221, 21714847
  • Additional Interchange: 22674901, 24201752
  • FleetPro Part #: DAY89935

Technical Specifications

  • Component Type: Automatic Spring-Loaded Belt Tensioner Assembly
  • Belt Design: 12-Rib Serpentine (K-Section)
  • Pulley Diameter: 74 mm
  • Pulley Width: 46.3 mm
  • Rotation: Counter-clockwise
  • Spring: Flat coil spring, for reduced bearing load and quieter operation
  • Grade: OE
  • Condition: New
  • Warranty: 1-Year FleetPro Warranty
  • Product Level: OEM
  • Brand: Dayco (Distributed by FleetPro Parts & Tires)
Key features
  • Flat Coil Spring Design: The flat coil spring is specified for reduced bearing load and quieter operation.
  • Matched to the 12-Rib Belt: Sized for the 12-rib serpentine (K-section) belt, with a 74 mm pulley 46.3 mm wide turning counter-clockwise.
  • Fixes the Classic Symptoms: Replaces the worn tensioner behind belt squeal on cold start, belt flutter or chirp, accelerated belt wear and a noisy or wobbling pulley.
  • Broad Volvo and Mack Coverage: Fits Volvo D13 and Mack MP8 engines across Volvo VNL, VNM, VNR and VHD and Mack Anthem, Pinnacle, Granite, CHU, CXU and GU series.
  • Six Volvo Numbers in One Part: Direct replacement for Volvo 21714847, 21461221, 21417563, 20582557, 20582558 and 20860873.
Specifications
Component Type
Automatic Spring-Loaded Belt Tensioner Assembly
Belt Design
12-Rib Serpentine (K-Section)
Pulley Diameter
74 mm
Pulley Width
46.3 mm
Rotation
Counter-clockwise
Spring
Flat coil spring, for reduced bearing load and quieter operation
Grade
OE
Condition
New
Warranty
1-Year FleetPro Warranty
UPC
036687956378
Product Level
OEM
Questions
Will this fit my truck?
This part fits Volvo D13 and Mack MP8 engines, 2018+, Volvo VNL, VNM, VNR and VHD series, Mack Anthem, Pinnacle, Granite, CHU, CXU and GU series, Front accessory drive - serpentine belt tensioner. Always confirm your year, make and model before ordering.
What part numbers does it replace?
Yes. It is a direct replacement that interchanges with Dayco 89935, Volvo 21714847, Volvo 21461221, Volvo 21417563, Volvo 20582558, Volvo 20582557, Volvo 20860873, 24201752, 22674901.
How fast does it ship?
In-stock orders placed before 12 PM Central on business days ship the same day from our Hanover Park, IL warehouse, and typically arrive in 2 to 5 business days anywhere in the USA.
What's your return policy?
Unused items in original packaging can be returned within 30 days, backed by our 30-day money-back guarantee. If we ship the wrong part, we cover the return label and send the correct one.