Allison Transmission and Cummins have teamed up to test and validate the new Cummins X15N 15-liter natural gas engine, which is paired with the Allison 4000 Series™ fully automatic transmission. This collaboration involves extensive field testing, carried out by Sandman, a bulk cement hauling fleet based in San Jose, California. The tests have exceeded 50,000 miles, showcasing significant improvements in both fuel efficiency and overall vehicle performance. The test vehicle, a Peterbilt tractor pulling double trailers loaded with bulk cement, has demonstrated the robust capabilities and productivity of the X15N engine combined with the Allison transmission.
Sandman, known for its fleet of over 100 Allison-equipped natural gas trucks, has been an integral part of this testing phase. The fleet manager, Victor Landaverde, noted the positive impact that the integration of Allison’s fully automatic transmissions had on their operations over two decades ago. The recent tests with the Cummins X15N engine paired with the Allison 4000 Series transmission have further enhanced their operations. The combination has provided excellent fuel efficiency, improved engine braking, and consistent power during shifting, significantly benefiting their daily operations in California’s stop-and-go traffic.
The Allison 4000 Series transmission is specifically designed to deliver both high performance and fuel efficiency. Its torque converter significantly improves startability, drivability, and overall productivity. The X15N engine, which is 500 pounds lighter than its diesel counterpart, when paired with this transmission, offers additional fuel savings and reduced emissions. The transmission used in Sandman’s tests is also equipped with FuelSense® 2.0, a unique set of software and electronic controls that offer up to 6% in fuel savings.
Allison’s fully automatic transmissions are versatile, compatible with multiple energy sources, including diesel, natural gas, electric hybrid, fuel cell, and battery electric. As the industry continues to explore electric vehicle technology, the adoption of alternative fuel engines like the Cummins X15N is expected to rise, helping fleets meet stringent emissions regulations. Rohan Barua, Vice President of North America Sales, Global Channel, and Aftermarket at Allison Transmission, emphasized the company’s commitment to helping fleets reduce their carbon footprint while maintaining productivity and efficiency. The successful testing of the Cummins X15N and Allison transmission pairing is a testament to this effort.
