Keep your semi trucks, big rigs, tractor trailers, and heavy-duty commercial vehicles running efficiently with the FleetRun FR-ENGN126 Belt Tensioner, a direct replacement for Cummins part number 3691282. Designed for Cummins ISX and QSX engines, this premium aftermarket tensioner maintains proper belt tension across critical engine components, including the alternator, water pump, and power steering pump, ensuring reliable operation for cargo trucks and fleet vehicles.
Engineered for durability, the FR-ENGN126 resists wear, heat, and vibration, making it ideal for long-haul trucks, heavy-duty fleets, and commercial tractor trailers. Proper belt tension prevents slippage, reduces engine downtime, and extends the life of your diesel engine systems, which is essential for fleet maintenance, truck repair shops, and owner-operators managing big rigs and commercial trucks.
✅ Direct replacement for Cummins 3691282
✅ Designed for semi trucks, tractor trailers, and heavy-duty commercial vehicles
✅ Maintains proper belt tension for turbo, alternator, and accessory drives
✅ Heavy-duty aftermarket construction for long-haul and fleet applications
✅ Backed by warranty, free shipping, fast delivery, and FleetRun customer service
Keep your commercial vehicles, cargo trucks, and big rigs on the road with confidence. The FleetRun FR-ENGN126 Belt Tensioner delivers durable performance, OEM-level fit, and reliable engine operation, making it the smart choice for heavy-duty truck repair and fleet maintenance.
| FleetRun vs Other Brands | |
|---|---|
| FleetRun | Others |
| ✔ Call Us Anytime 872-240-4144 | ✘ No Search By VIN Options |
| ✔ 6 Month Warranty On All Parts | ✘ Limited Warranty Or None At All |
| ✔ We Pay Shipping On Most Parts | ✘ You Pay Shipping |
| ✔ 0% Interest Payment Plans | ✘ No Financing |
| ✔ Pay For The Part Not The logo | ✘ High Markup |
| ✔ 2-4 Day Shipping | ✘ 4-7 Day Shipping |
| ✔ Same Day Shipping | ✘ 24-48 Hour Order Processing Time |
Product title
$19.99 | $24.99
Product title
$19.99 | $24.99
Product title
$19.99 | $24.99
Product title
$19.99 | $24.99
Nicolas S.
Fits perfectly, fast shipping better than Amazon, thank you
Ray G.
item fit just like the OEM part, works find, price was good, will buy from again
Ivan Dimitrijevic
Rus is one of the best salesman I ever came across. Responding fast, always accurate, delivers superfast. Great pleasure working with him.
JACOB B.
Everything they told me happened. Delivery was a day early. Will use them again
SURINDER
Excellent service fast delivery good price good quality 👍👍👍👍👍
aleksandr r.
VERY FAST DELIVERY THANKS
