Gates 38730 belt tensioner for the 2023 Peterbilt 520 6-cylinder 10.8L and other vehicles holds the accessory drive belt at working tension. A patented damping mechanism limits vibration and helps extend belt life.
- Gates FleetRunner heavy-duty automatic belt drive tensioner
- Patented design for belt alignment and tension
- Patented labyrinth seal that keeps contamination out of the internal parts
- Steel pulleys with dust shields that protect the internal bearings
- Double-row bearings for higher load capacity
- Round chrome-silicone torsion spring for less flex-fatigue
Quick facts
- Part: Gates 38730 belt tensioner
- Also called: serpentine belt tensioner
- Fits: 2023 Peterbilt 520 6-cylinder 10.8L and other vehicles
- Position: air conditioning, fan, fan and water pump
- Material: Steel
- Condition: New
Belt squeal, a fluttering belt or a rumble from the pulley area can mean the tensioner is wearing out. Before you replace this serpentine belt tensioner, rule out a worn belt or a failing accessory, because noises like these have more than one source.
Fits
This tensioner is listed for a wide range of Peterbilt and Kenworth models, including the 2023 Peterbilt 520 6-cylinder 10.8L, the 2020 Kenworth T680 6-cylinder 12.9L and the 2016 Peterbilt 389 6-cylinder 12.9L. The 2020 Kenworth T680 6-cylinder 12.9L takes one. If your truck is not one of these, look up its year and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Position: air conditioning, fan, fan and water pump
- Quantity per vehicle: 1
- Pulley outside diameter: 75 mm (2.95 in), both pulleys
- Pulley width: 46.5 mm (1.83 in), both pulleys
- Bearing bore inside diameter: 55 mm (2.17 in)
- Mounting holes: 3
Build and materials
- Type: automatic belt tensioner, 2 pulleys, not flanged
- Belt type: V-ribbed
- Contact surface: smooth/backside
- Material: Steel
- Condition: New
- Country of origin: Canada
In the box
One belt tensioner assembly with its bracket and mounting bolt.
Interchange: 89949 · 910140A · 1787112 · 1787112PE · 1853657 · 1853657PE · 1918442 · 1918442PE · 1943947 · 1943947PE · 910140
This part cross-references / interchanges with the following part numbers:
38730, 89949, 910140A, 1787112, 1787112PE, 1853657, 1853657PE, 1918442, 1918442PE, 1943947, 1943947PE, 910140
Frequently Asked Questions
Is this Gates belt tensioner right for the 2020 Kenworth T680 6-cylinder 12.9L?
Yes. Gates 38730 is listed for the 2020 Kenworth T680 6-cylinder 12.9L, which takes one. For another truck, find its year and engine in the "Vehicles it fits" section.
Does the Gates drive belt tensioner come with a bracket and bolt?
Yes. The Gates 38730 comes as the tensioner assembly with its bracket and one mounting bolt.
What size are the pulleys and bearing bore on the 38730 tensioner?
On the Gates 38730, each of the two steel pulleys is 75 mm (2.95 in) in outside diameter and 46.5 mm (1.83 in) wide. The bearing bore is 55 mm (2.17 in).
Why is my accessory belt squealing, and could the tensioner be involved?
Squeal, belt flutter or a rumbling pulley can mean a worn tensioner, but a worn belt or a failing accessory can make similar noise. A shop can test the tensioner while the engine runs.
Does the Gates 38730 replace part number 1787112?
Yes. 1787112 is on the interchange list for Gates 38730, along with 1853657, 1918442 and 1943947.
