Mack Engine Drive Belt 20870834

August 4, 2025

Mack Engine Belt 20870834

This belt delivers mechanical power from the crankshaft pulley to key engine components—such as the alternator, water pump, and power steering pump—ensuring they function efficiently.

Engineered to OEM specifications, it offers exceptional resistance to wear, cracking, and stretch, providing dependable performance in demanding heavy-duty environments.

Product Specifications

Type: Serpentine (multi-rib) belt
Rib Count: 6
Effective Length: 82.5 inches
Top Width: 0.82 inches
Outside Circumference: 83.06 inches
Material: EPDM with aramid reinforcement
Cross Reference Part Numbers: 88GB459P825, K080825, 5080825

Back to blog

Search for your Cross Reference

V‑Belt Finder Search Tool

Enter a belt number (e.g., A88, BX70, 5L600, 3VX560) and hit Search.

Tip: Try the kevlar “K” variant too (e.g., 5L600K) if applicable.
As an Amazon Associate, a commission is earned from qualifying purchases.

Disclaimer: Manufacturer names, part numbers, product descriptions, images, and symbols are used strictly for identification and cross-reference purposes. CrossBelts.com is not affiliated with, authorized by, or sponsored by any of the manufacturers listed. All trademarks and brand names are the property of their respective owners. While we make every effort to ensure accuracy, customers are responsible for verifying compatibility and specifications before purchase. Use of any original equipment manufacturer (OEM) name does not imply endorsement or direct replacement unless explicitly stated.

*Please note that as an Amazon Associate, a commission is earned from qualifying purchases. Some links on this page will direct you to Amazon or other affiliate programs.