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Continental Conti Extreme Poly-V Belt - 12-Rib 64 in, Mack CHU/CXU & Volvo VNL - 4120640X K120640 815.4120640X
Continental Conti Extreme Poly-V Belt - 12-Rib 64 in, Mack CHU/CXU & Volvo VNL - 4120640X K120640 815.4120640X
Continental

Continental Conti Extreme Poly-V Belt - 12-Rib 64 in, Mack CHU/CXU & Volvo VNL - 4120640X K120640 815.4120640X

In stock
SKU: 815.4120640X
$29.86
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Fitment

Fits these trucks

2011-2013 Mack CHU, CXU612 and 613Volvo VNL 660, 670 Gen 2, 730 and 780Serpentine accessory drive - 12-rib poly-V pulleys
Always confirm your year, make & model before ordering.
Part numbers

OEM & interchange numbers

4 cross-refs
Contitech 4120640X Contitech 4120640 Gates K120640 Gates K120640HD
Direct 1-to-1 replacement for every number above. Tap any number to copy.
Overview

Drive every accessory off one loop with this Conti Extreme Poly-V serpentine belt distributed by FleetPro Parts & Tires. It is a 12-rib belt, 64.0 in long and 1.68 in wide, specified for 2011-2013 Mack CHU and CXU tractors and Volvo VNL 660, 670 Gen 2, 730 and 780 applications. A belt this wide is doing serious work, and when it goes glazed or cracked you hear it first as a squeal and feel it next as accessories dropping out one by one. 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.

Twelve Ribs of Bite: The Conti Extreme Poly-V Advantage

Twelve ribs across 1.68 in of belt width is a lot of seating surface, and that is the point. Spreading the drive load across twelve grooves instead of a handful keeps contact pressure per rib low, which is what stops a heavily loaded accessory drive from polishing its own belt smooth and then slipping every time the load steps up. The Conti Extreme construction is built for exactly that duty - the long, hot, high-mileage running that a Class 8 tractor does for a living.

Length is the deciding spec on any serpentine belt. At 64.0 in, this belt is cut for the drives it is listed against, which puts the automatic tensioner in the middle of its travel instead of at the end of its range with nothing left for stretch. The belt weighs 0.6 lbs and ships in a 16 x 6 x 1 in carton, so it is an easy and inexpensive spare to carry.

At FleetPro Parts & Tires, we know a belt failure is never just a belt. This Conti Extreme belt is a direct replacement for highly searched industry numbers including Contitech 4120640X and 4120640, and Gates K120640 and K120640HD. Check the tensioner condition at every belt change, because a fresh belt on a tired tensioner will chirp and wear out on the same schedule as the one you removed.

Vehicle Fitment & Compatibility

This Conti Extreme Poly-V belt is intended for the following commercial applications:

  • Make/Model: 2011-2013 Mack CHU, CXU612 and 613
  • Make/Model: Volvo VNL 660, 670 Gen 2, 730 and 780
  • Belt Path: 12-rib poly-V accessory drive, 64.0 in loop
  • Component Group: Engine / Belts & Tensioners

Direct Replacement & Cross-Reference Numbers:

This Continental serpentine belt serves as a direct replacement for the following part numbers:

  • Contitech Interchange: 4120640X, 4120640
  • Gates Interchange: K120640, K120640HD
  • Automann Distributor #: 815.4120640X

Technical Specifications

  • Component Type: Conti Extreme Poly-V serpentine belt
  • Ribs: 12
  • Length: 64.0 in
  • Width: 1.68 in
  • Weight: 0.6 lbs
  • Package Dims: 16 x 6 x 1 in
  • UPC: 889626420368
  • Warranty: 1-Year FleetPro Warranty
  • Product Level: OEM
  • Brand: Continental (Distributed by FleetPro Parts & Tires)
Key features
  • 12-Rib Load Spreading: Twelve grooves across 1.68 in of width keep contact pressure per rib low, so a heavily loaded drive stops polishing its own belt smooth.
  • Conti Extreme Construction: Built for the long, hot, high-mileage running a Class 8 tractor does for a living rather than light-duty service.
  • Correct 64.0 in Length: Cut for the drives it is listed against, leaving the automatic tensioner mid-travel with range left for belt stretch.
  • Mack CHU/CXU and Volvo VNL Coverage: Listed for 2011-2013 Mack CHU and CXU tractors and Volvo VNL 660, 670 Gen 2, 730 and 780.
  • Direct Contitech and Gates Interchange: Replaces Contitech 4120640X and 4120640, and Gates K120640 and K120640HD.
Specifications
Component Type
Conti Extreme Poly-V serpentine belt
Ribs
12
Length
64.0 in
Width
1.68 in
Fits
2011-2013 Mack CHU, CXU612, 613; Volvo VNL 660, 670 Gen 2, 730, 780
Weight
0.6 lbs
Package Dims
16 x 6 x 1 in
UPC
889626420368
Warranty
1-Year FleetPro Warranty
Product Level
OEM
Questions
Will this fit my truck?
This part fits 2011-2013 Mack CHU, CXU612 and 613, Volvo VNL 660, 670 Gen 2, 730 and 780, Serpentine accessory drive - 12-rib poly-V pulleys. Always confirm your year, make and model before ordering.
What part numbers does it replace?
Yes. It is a direct replacement that interchanges with Contitech 4120640X, Contitech 4120640, Gates K120640, Gates K120640HD.
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.