Navistar launches integrated powertrain for vocational sector

International HX Series tractor in vocational application

Navistar has launched the International S13 Integrated Powertrain for the vocational market.

Developed in collaboration with the Traton Group, Navistar says the S13 Integrated Powertrain demonstrates advancements in robustness, reliability and performance and showcases the company's continued commitment to customers by setting the foundation for the next generation of vehicles, technologies and comprehensive ownership solutions.

"The S13 Integrated Powertrain is the most advanced powertrain we've ever produced and the lightest vocational powertrain available on the market," says Mark Stasell, vice president, Vocational Truck Business. "The S13 Integrated will benefit vocational customers by achieving stellar performance, simplicity and serviceability, and superior operating economy."

Navistar says the new powertrain launch expands upon the current S13 Integrated Powertrain customer offering. Navistar first introduced the S13 Integrated Powertrain for the on-highway market in August 2022, available in the International LT and RH Series models.

Developed from a clean sheet design, the S13 Integrated Powertrain consists of three distinct components, an engine, a transmission and an aftertreatment system, all designed and developed concurrently to ensure maximized compatibility and integration between systems.

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Navistar says the 13-liter International S13 engine achieves advanced fuel efficiency and performance through a clean-burn combustion strategy and a reduction of friction and pumping losses. The S13 engine is Navistar's first engine designed with selective catalytic reduction (SCR) technology as the primary emissions reduction technology. The company says the absence of an exhaust gas recirculation (EGR) cooler on this engine allows for nearly 100 percent of exhaust to flow to the fixed geometry turbocharger, equating to more power and improved engine performance.

Additionally, the engine operates on low revolutions and high torque which equates to fewer fuel injections and less fuel consumption, delivering up to 515 horsepower and 1,850 lb.-ft. of torque.

The compact design of the dual stage aftertreatment is purpose built with easy access for serviceability, the company says, as well as significantly improved emissions control and fuel efficiency. To keep temperatures at an optimal range and extend service intervals, the aftertreatment system includes a dual-stage SCR catalyst system in a one-box design. And since an EGR cooler was eliminated from the combustion process, less soot and particulate matter are generated. Navistar says this cleaner combustion cycle allows for extended service intervals and eliminates the need for the diesel oxidation catalyst (DOC) and active regeneration.

Navistar's S13 integrated powertrain

"Vocational trucks often spend quite a bit of time idling on a job site which has historically required more frequent active regens. The aftertreatment system of the S13 Integrated Powertrain, combined with the engine combustion strategy, vastly reduces the need for both active and parked regens," says Stasell.

Coupled with the S13 engine is International's T14 Transmission, a 14-speed automated manual transmission (AMT) that the company says uniquely combines the transmissions low range and six reverse gears through the use of a planetary gear set. The T14 combines two deep crawler gears and a wide 26.7 overall ratio to provide slow-speed maneuverability, exceptional startability and enhanced performance running to and from the job site.

The T14 Transmission features vocational-specific drive modes including off-road mode, manual mode and paver mode. These drive modes combined with other vocationally focused functionalities, such as split-shaft mode and rocking mode, which breaks the truck free when stuck, prove the T14 is ready for any job, Navistar says.

As part of the clean sheet design, shifting logic and integrated software controls maximize efficiency and performance resulting in gear shifting that is perfectly matched to engine revolutions. The T14 also uses an electronic clutch actuator with controls integrated with the engine to deliver faster, smoother shifting, the company says.

Multiple spec'ing options are available for various vocational customer applications including front-engine power take-off (FEPTO), rear-engine power take-off (REPTO) as well as single and dual output transmission PTOs.

All PTO options are factory-installed at Navistar's Integrated Powertrain Plant in Huntsville, Ala., and carry the warranty of the T14 transmission.

The S13 Integrated Powertrain also takes advantage of Navistar's Diamond Logic electrical system to optimize body integration, convenience and safety features. This provides both chassis upfitters and customers maximum flexibility, simplicity, and functionality.

Finally, Navistar says the S13 Integrated Powertrain includes several customer benefits outside of the product itself, including dealer integrated software, built-in service products and repair maintenance contracts.

Navistar's connected solution, OnCommand Connection (OCC), comes standard on all International vehicles including those equipped with the S13 Integrated Powertrain. OCC combined with International 360 provides fleet monitoring and preventive maintenance scheduling to increase uptime and keep customers' businesses operating at maximum efficiency. Customers also many use the OCC Go mobile app to monitor their vehicles in real time.

When spec'd for vocational applications, Navistar says the S13 Engine and Dual Stage Aftertreatment system comes standard with a two-year, unlimited miles and unlimited hours warranty, and the T14 Transmission and factory-installed PTOs feature a three-year, unlimited miles warranty. A selection of additional warranties and extended service contracts are also available. The S13 Integrated Powertrain is backed by North America's largest one-stop dealer network to support any service needs, the company adds.

"The S13 Integrated Powertrain increases efficient traditional propulsion technologies to allow the industry to advance toward a more sustainable future," says Göran Nyberg, executive vice president, Commercial Operations.

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