DAY89941

Belt Tensioner (D11/D13)
4.5 Ratings
Part # DAY89941
UPC/GTIN# 601961390249
Availability In Stock (8)
Feature Specification
Type Heavy‑duty automatic belt tensioner (accessory drive) ​
Product Application Volvo D11/D13 and Mack MP7/MP8 accessory serpentine belt systems ​
Direction of rotation Counter‑clockwise ​
Belt type Serpentine / multi‑rib ​
Number of pulleys 1 flat pulley ​
Pulley diameter 74 mm ​
Pulley width 38 mm ​
Pulley face Flat (for multi‑rib belt) ​
Construction Cast aluminum housing with flat‑spring, lubricated nylon pivot bushing
  • Automatically maintains correct belt tension and compensates for belt stretch on D11/D13 and MP7/MP8 accessory systems.​
  • Flat‑spring design reduces tension variation and belt chirp while protecting accessory bearings from over‑tension.​
  • Supplied as a complete assembly with pre‑installed flat pulley, ready for bolt‑on replacement.

Fits Volvo / Mack applications

  • Volvo VNL, VNR, VNM, VHD, VAH, VNX with D11/D13 engines (various 2014–2021 model years).​
  • Mack Anthem, Granite, Pinnacle, TerraPro, LR, GU7/GU8/CXU/MRU/LEU with MP7/MP8 engines (approx. 2014–2022).

Cross Reference / Part Interchange

Manufacturer / Brand Part Number(s) Notes
Dayco 89941 ​  
Volvo / Mack 21819687   
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