Able to spray at widths of 18 or 36m, the high-performance spray boom is considerably lighter than steel or aluminium designs. However, the carbon fibre material used in its construction is around 5.5 times stronger than steel and is able to flex, which relieves the boom structure from the stress that can cause fractures in metal booms. The carbon fibre boom is specially designed to withstand the high dynamic loads created at high application speeds of 20 to 30kph, even with very wide booms.
The reduced weight of the carbon fibre boom, at around five times lighter than a steel equivalent, also has benefits for ride performance. The boom’s low inertia greatly reduces the undesirable roll and yaw movement often seen in wide spray booms. In addition automatic boom levelling systems, like John Deere’s own BoomTrac, are able to control the ultra-lightweight boom with greater precision, enabling lower boom heights and higher speeds to be employed.
The R4050i is powered by the same 6.8-litre John Deere PowerTech PSS engine as the smaller machine, producing 235 rated hp (boosted to 255hp with intelligent power management/IPM). This engine meets Stage IV/Final Tier 4 emissions regulations by incorporating selective catalytic reduction (SCR).
The machine’s centrally located, easy to access cab provides a comfortable operating position and offers good visibility both on the road and in the field. The sprayer chassis features dual-strut independent wheel suspension for a smooth, fast ride, and hydraulic track width adjustment as standard. There is also a choice of two-wheel, four-wheel or crab steering to suit different crop and field conditions.
The R4050i is equipped as standard with the John Deere GreenStar 3 2630 touchscreen display with full FieldDoc spray documentation and ISOBUS compatibility. The sprayer comes AutoTrac ready and with a free JDLink Ultimate subscription for one year, which enables a range of additional FarmSight precision farming solutions including new Remote Display Access and Wireless Data Transfer, as well as Service Advisor Remote.
Other standard features include a Hydro Handle multi-functional control lever, Solution Command electronic sprayer control for automatic filling, mixing, spraying and rinsing, and a 50-litre PowrFill inductor for safe transfer of crop protection chemicals into the main tank. Total spray pump capacity is a maximum of 560 litres/min, with a flow of up to 380 litres/min.
John Deere’s established BoomTrac automatic boom levelling system can be upgraded to the new variable geometry BoomTrac Pro option, for increased application accuracy and efficiency. BoomTrac Pro automatically adjusts the height of the individual boom wings independently to match the terrain.
Instant crop or soil coverage to the full working width of the sprayer is provided by the standard pressure circulation system, which keeps the liquid solution moving along the stainless steel spray lines and right up to the nozzles, even when not spraying. Once spraying starts, the system feeds the spray lines from both ends to maintain a constant pressure and application rate.
To reduce input costs by minimising overlaps or skips, John Deere’s automatic Section Control system switches individual boom sections on and off when entering or leaving predefined areas, including headlands, while LED boom lights help to maintain high productivity at night.