At Bauma 2025 in Munich, John Deere Power Systems laid out its vision for the future of propulsion in off-highway machinery. A future where internal combustion engines—especially diesel—will continue to play a central role, supported by increasingly compact and efficient electrified solutions and batteries
Among the most anticipated innovations unveiled by John Deere at Bauma 2025 was the new “JD4” engine, a four-cylinder designed from the ground up, representing a radical evolution compared to the previous cam-in-block engine that had been in service for over twenty years. The “JD4” is in fact an overhead camshaft engine, equipped with a high-pressure injection system designed to deliver high volumetric and thermal efficiency within an extremely compact architecture.
Developed for OEM machines in the construction and agriculture segments, it stands out for its architectural versatility, conceived with the goal of accommodating technologies that will allow compliance with future emissions regulations without the need to redesign the entire engine block. In development since 2022, the “JD4” is currently undergoing an intensive durability testing campaign across dozens of vehicles, in extreme conditions of temperature, vibration, and load, to ensure the robustness required by heavy-duty applications.
The new power unit is not only more efficient and compact than its predecessor, but also more flexible in terms of energy sources. With the right modifications, it is capable of running on spark-ignition fuels such as gas and hydrogen, enabling adaptation to the regulatory and infrastructural frameworks of different global markets.
John Deere has also significantly increased the number of auxiliary outputs on the engine, from one to three, to meet the growing demand for accessory power in increasingly electrified vehicles. This clearly signals the company’s intent to support hybrid architectures, both mild and full hybrid, where power management can be shared between the engine and the onboard electronics.
Another notable mechanical innovation is the introduction of hydraulic valve lash adjusters, now featured even on compact engines. This technology, borrowed from the automotive sector but adapted to withstand tens of thousands of hours of continuous work, eliminates the need for manual valve train adjustments, thereby reducing maintenance costs.
On the software side, John Deere maintains a vertically integrated approach. It develops both control electronics and ECU software in-house, and even builds the control units internally. This allows over-the-air updates to optimize performance without machine downtime, and enables advanced predictive diagnostics. The “Expert Alerts” system leverages big data collected via telematics to anticipate potential failures and schedule maintenance based on actual usage, even predicting specific events such as the estimated wear of a component at 7,000 operating hours.
In parallel, John Deere also introduced the new Kreisel battery pack “KBE.59.750M,” more compact than the previous “KBP63,” designed to enable full-electric architectures for compact machines, as well as support the company’s range of hybrid solutions in construction and agriculture.
The rapid pace of battery evolution—much faster than that of combustion engines—underpins JDPS’s dual strategy. The company continues to invest heavily both in diesel propulsion for applications with intensive, continuous duty cycles (such as combines or dump trucks) and in electrification for cyclical applications where energy regeneration enables real optimization of hybrid systems.
Title: John Deere Power system Jd4: off-Highway Destination
Translation with ChatGPT
