The 2020 Freightliner B2 has 15 belt drive parts with verified fitment on this page — 2 part types and 4 brands, covering all 4 engine options (5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged and 8.0L V8 Turbocharged). Each part includes a manufacturer part number and application notes.
The belt drive system on the 2020 Freightliner B2 spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. All 15 listed parts are Belt (12 parts) and Belt Tensioner (3 parts).
The 2020 Freightliner B2 was sold with 4 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2020 Freightliner B2 belt drive parts are GATES (8 parts), ACDELCO (3 parts) and DAYCO (3 parts), plus 1 more brand. Quality grades include Standard Replacement, Heavy Duty and 100-149" Length.
4 parts on this 2020 Freightliner B2 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including GATES K081074 (Belt) and GATES K080708HD (Belt). Click any part number to see every vehicle that part fits.
Belt
100-149" Length
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular Fits: 5.1L L4 DIESEL Turbocharged | K081074 | 🇺🇸 US 🇨🇦 CA | Micro-V | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular Fits: 5.1L L4 DIESEL Turbocharged | K080708HD | 🇺🇸 US 🇨🇦 CA | Fleet Runner Heavy Duty Micro-V | View on Amazon |
| GATES Popular Fits: 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged | 9447HD | 🇺🇸 US 🇨🇦 CA | Fleet Runner High Capacity V-Belt (Heavy-Duty) | View on Amazon |
| ACDELCO Fits: 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged | K080962HD | 🇺🇸 US 🇨🇦 CA | Professional / GoldHeavy Duty | View on Amazon |
| GATES Fits: 5.1L L4 DIESEL Turbocharged | K081074HD | 🇺🇸 US 🇨🇦 CA | Fleet Runner Heavy Duty Micro-V | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged | K080962HD | 🇺🇸 US 🇨🇦 CA | Fleet Runner Heavy Duty Micro-V | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular Fits: 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged | 9447 | 🇺🇸 US 🇨🇦 CA | XL High Capacity V-Belt | View on Amazon |
| ACDELCO Fits: 5.1L L4 DIESEL Turbocharged | 8K708 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| ACDELCO Fits: 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged | 17447 | 🇺🇸 US 🇨🇦 CA | Professional / Gold | View on Amazon |
| DAYCO Fits: 5.1L L4 DIESEL Turbocharged | 5080710 | 🇺🇸 US 🇨🇦 CA | SerpentineGold Label Industrial Poly-Ribbed Belt | View on Amazon |
| DAYCO Fits: 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged | 5080962 | 🇺🇸 US 🇨🇦 CA | SerpentineGold Label Industrial Poly-Ribbed Belt | View on Amazon |
| GATES Fits: 5.1L L4 DIESEL Turbocharged | K080708 | 🇺🇸 US 🇨🇦 CA | Micro-V | View on Amazon |
This table covers the serpentine and accessory belts that drive the front accessories. Typical signs include squeal on cold start, cracks across the ribs, or glazing on the back of the belt. A new belt on a worn tensioner will squeal within weeks — spin the idlers by hand while the belt is off.
12 Belt parts are listed for the 2020 Freightliner B2, from GATES, ACDELCO and DAYCO. GATES K081074 carries the "Popular" badge.
In the 100-149" Length grade, GATES supplies 1 part: grouped under the catalog's "100-149" Length" designation — the notes column spells out what sets them apart. A representative part number is GATES K081074.
The Heavy Duty section lists 5 options from GATES and ACDELCO — rated for severe service. GATES K080708HD is listed in this group.
The Standard Replacement section lists 6 options from GATES, ACDELCO and DAYCO — built to original-equipment specification. GATES 9447 is listed in this group.
Belt Tensioner
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CLOYES Fits: 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged | B20352 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DAYCO Fits: 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged | 89475 | 🇺🇸 US 🇨🇦 CA | Accessory Drive | View on Amazon |
| GATES Fits: 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged | 38766 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the automatic tensioners that hold belt tension. Typical signs include belt flutter, a chirp that returns after a new belt, or a damper that no longer holds the arm. Replace the tensioner with the belt at higher mileage; the labor overlaps almost entirely.
3 Belt Tensioner parts for the 2020 Freightliner B2 come from 3 brands — CLOYES, DAYCO and GATES.
Listed part numbers: CLOYES B20352, DAYCO 89475 and GATES 38766.
Buying Belt Drive Parts for a 2020 Freightliner B2
On this vehicle, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys.
- Match the engine first. Every belt drive part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the tensioner and idler pulleys with any belt at higher mileage — the labor overlaps almost entirely.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Belt and Belt Tensioner .
Frequently Asked Questions
How many belt drive parts fit the 2020 Freightliner B2?
Our catalog currently lists 15 belt drive parts for the 2020 Freightliner B2 across 2 subcategories and 4 brands, covering all 4 engine options (5.1L L4 DIESEL Turbocharged, 6.7L L6 DIESEL Turbocharged, 6.7L L6 Turbocharged and 8.0L V8 Turbocharged). Each part is matched to the engine(s) it fits.
Do belt drive parts differ between 2020 Freightliner B2 engines?
Yes. Every belt drive part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of belt drive problems on a 2020 Freightliner B2?
Common symptoms include squealing on cold start, a belt that shows cracking or glazing, or an accessory that slows under load. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the tensioner and idler pulleys with any belt at higher mileage — the labor overlaps almost entirely.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2020 Freightliner B2 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2020 Freightliner B2?
First match the engine — each row shows which engine(s) the part fits. Then a new belt on a worn tensioner will squeal within weeks — check tensioner damping and idler bearings while the belt is off. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2020 Freightliner B2
Belt Drive Parts for Other Freightliner B2 Years
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