Dayco Serpentine Belt P/N:5120570

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$68.99

MPN: 5120570

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Dayco Serpentine Belt P/N:5120570

$68.99

Description

Silence belt squeal and keep the fan and water pump turning with the Dayco Serpentine Belt (MPN 5120570), a 12-rib, K-Section poly-rib belt that wraps over the accessory pulleys to transfer crankshaft power. It drops in as a direct-fit replacement for the 2020-2021 Kenworth W900 [6-12.9L], 2019-2023 Kenworth W990 [6-12.9L], 2014 Peterbilt 388 [6-12.9L], the 2014-2017 Peterbilt 389 [6-12.9L, All], and the 2020-2022 Peterbilt 389 [6-12.9L]. In the fan, fan-and-water-pump drive position, it routes belt power to keep engine cooling and accessories running.

Construction: aramid-reinforced EPDM, black, with a Straight Rib profile and standard rib depth.
Rib layout: 12 ribs, K-Section cross section, 1.66 in top width, 57.008 in (1448.01 mm) effective length.
Rated range: operates from -45°F to 212°F (-42.7°C to 100°C).
Standards: meets SAE J1459 and SAE J2432. Country of origin: Argentina.

Squealing, chirping, cracking, or fraying ribs are signs the belt may need replacing; if a worn belt is the cause, this replaces it. Diagnose the tensioner and pulleys too, since squeal can come from those as well.

Interchange: K120571HD · 12PK1445 · 12PK1450 · 4120562 · K120571 · 25-120571 · 25120571 · 25-120571HD · 25120571HD · Manufacturer part number 5120570.

Manufacturer's Description

Product Specs

Buyer's Guide

Interchange Part Numbers

This part cross-references / interchanges with the following part numbers:

K120571HD, 12PK1445, 12PK1450, NA, 4120562, K120571, 25-120571, 25-120571HD, D84-1003-121448, D84-1002-121451

Frequently Asked Questions

What does this Dayco belt do?

It's a 12-rib, K-Section poly-rib serpentine belt that wraps over the accessory pulleys to transfer crankshaft power and drive the fan and water pump on the listed trucks.

Which vehicles does it fit?

It's a direct-fit for the 2020-2021 Kenworth W900, 2019-2023 Kenworth W990, 2014 Peterbilt 388, and the 2014-2017 & 2020-2022 Peterbilt 389 (6-12.9L). See the Buyer's Guide tab for the full list.

What is the belt made of?

It uses aramid-reinforced EPDM with a Straight Rib profile, and it meets SAE J1459 and SAE J2432 standards.

What is its temperature rating and size?

It is rated from -45°F to 212°F (-42.7°C to 100°C), with a 1.66 in top width and 57.008 in (1448.01 mm) effective length across 12 ribs.

What numbers does it interchange with?

It replaces K120571HD, 12PK1445, 12PK1450, 4120562, K120571, 25-120571 (25120571), and 25-120571HD (25120571HD).