Yanmar launches four new models in its flagship YT4S/5S tractor series lineup. The new series features common rail diesel engines, ranging from 88 – 114 hp output and Yanmar’s own developed CVT transmission.
The new YT4S/5S Series is designed to meet the needs of large-scale farming. Equipped with high-output engines, the tractors provide stable performance during heavy-duty tillage and towing operations. Models featuring Straight-Line Assist come standard with RTK-GNSS technology, helping reduce operator workload while enabling accurate straight-line operation.
The new series also introduces a redesigned front exterior inspired by Yanmar’s signature “Y” brand motif. Combined with high-intensity LED lighting, the design improves forward visibility and enhances operator comfort and safety.
High-output engine
The YT5114S is powered by an efficient common rail diesel engine, delivering a maximum output of 114 horsepower. The model also features a maximum hydraulic lift capacity of 4,500 kgf, enabling stable operation even when equipped with large, heavy implements commonly used in large-scale farming.
The tractors also feature Yanmar’s proprietary I-HMT (Integrated Hydro Mechanical Transmission), a continuously variable transmission developed in-house. The system automatically enables operators to select the optimal working speed based on field conditions and task requirements, improving efficiency while eliminating shift shock for smoother operation and improved work quality.
RTK Straight-Line Assist (G Specification)
Models equipped with Straight-Line Assist (G specification) utilize an RTK-GNSS-based auto-steering system. By registering reference points A and B in advance, operators can perform fieldwork parallel to the reference line with an accuracy of approximately ± 2–3 centimeters. The system minimizes positional drift over time, making it particularly effective for precision-dependent operations such as seeding.
RTK-GNSS (Real-Time Kinematic Global Navigation Satellite System) determines position using both satellite-based positioning signals and correction data received from fixed base stations or electronic reference points. Use of RTK functionality requires a separate correction service subscription and communications terminal.
To further reduce operator workload, the tractor automatically raises the implement during headland turns when the steering wheel is turned. After completing the turn, lowering the implement automatically reactivates the Straight-Line Assist function, allowing operators to focus on steering.
Enhanced safety features
The YT4S/5S Series is equipped with high-intensity diffused LED work lights that improve visibility during early morning and nighttime operations, supporting safer and more comfortable long-hour use. Large two-stage telescoping mirrors provide improved rearward visibility and a clearer view of attached implements. Additional safety features include a seatbelt reminder system and a PTO interlock mechanism designed to help reduce the risk of serious accidents.
The new tractors are currently only available in Japan.
