Precision for robust yields
Engineered for tough conditions and maximum area performance, the 740A pneumatic drill for minimum tillage and the all-round 750A pneumatic drill from John Deere impress with the highest precision standards. Conventional, minimum or no till – these high performance machines deliver outstanding advantages whatever the system.
The ProSeries Opener was designed with two goals in mind: lower overall maintenance and increased accuracy. In conditions ranging from reduced tillage to conservation tillage and to the demanding conditions of no-till, the ProSeries Opener places each seed with precision at a specific depth, ensuring excellent seed-to-soil contact for even germination. Each opener is individually suspended to follow the ground contours and variations of the soil.
Each ProSeries Opener features individual adjustments for:
- Depth gauge wheel – for setting seeding depth
- Press wheel – for pressing the seed gently into the furrow
- Furrow closing wheel – for covering the seed and closing the see trench
The ProSeries Opener offers a number of improvements compared to the previous 90 Series Opener, including overall better seed trench closure with the serrated closing wheel and improved seed-to-soil contact through the narrower press wheel and seed boot. Along with updated sealed bushings to minimise corrosion and dust buildup, there are also reduced grease points with the remaining single greaser, requiring service only once per season. Additionally, the ProSeries Opener offers easier depth adjustment and extended service life of the ground-engaging parts.
The ProSeries Opener allows operators to get into the field earlier and keeps them seeding longer with improved accuracy.
Active Hydraulic Downforce
An active hydraulic down pressure system is used to provide penetration. Down pressure is easily adjusted with the pressure valve and gauge located at the front of the mainframe. The operator can easily adjust the down pressure as operating conditions change.
In hard-to-penetrate conditions, additional ballast can be added by placing tractor suitcase weights on the drill frame. Up to 10 45-kg (99.2-lb) weights can be added to obtain maximum down pressure per opener.
The John Deere ProSeries™ Openers feature 50 mm (2 in.) of free travel in each opener before pressure starts to be applied by down pressure coil springs. This allows the individual openers to adapt to the terrain while minimizing the possibility of the gauge wheels bulldozing in soft soil conditions.
The opener coil spring in turn allows a maximum travel of 200 mm (7.9 in.) upwards or 150 mm (5.9 in.) downwards before the hydraulic down pressure reacts to the uneven conditions.
Finally, the hydraulic down pressure cylinders allow the openers an additional 400 mm (15.7 in.) of travel with active hydraulic down pressure to follow the ground precisely. The hydraulics provide additional pressure on the openers when needed for maximum penetration. A relief valve is provided to protect against over pressure.
Metering System Overview
The 750A Drill utilises a pneumatic metering system, which allows for seed rates from 1.1 to 412 kg/ha (2.4 to 908.3lb/ha). The metering device typically operates to 7-10 percent coefficient of variation. Differences in metering accuracy are +/- 1 percent for diagonal and length-wise inclination (F.A.T. CH – University of Switzerland).
Due to the conical hopper design, it is possible to continue seeding until a residual quantity of only 500 g (1.1lb) is left in the seed hopper.
The metering system of the 750A is capable of seeding a wide range of crops at either low rates or high rates because of the accurate metering system.
The metering system can be adjusted between normal seed settings (e.g., cereals) and fine seed settings (e.g., rape) quickly and easily without the need for tools. In addition, large seeds like peas and beans can be metered without special inserts.
3-m (9.8-ft) and 4-m (13.1-ft) models feature a single metering device, and the 6-m (19.7-ft) model is fitted with two.
Greenstar / ISOBUS option
The GreenStar/ISOBUS option includes electric drives for the seed metering devices, offering more convenient calibration and the ability to save multiple calibrations for future use. It is also possible to increase or decrease the seed rate on the go – the electric seed meter simply changes speed to adjust the rate.
To utilise Section Control with the 750A Drill, a StarFire™ differential global positioning system (DGPS) receiver and an additional GreenStar Section Control activation is needed. With 3-m (9.8-ft) and 4-m (13.1-ft) 750A Drills, Section Control can switch off the full drilling width. For 6-m (19.7-ft) drills, Section Control can switch off either the left or right side of the drill or the full width.