The John Deere 1990 CCS™ (Central Commodity System) features metering gates at each individual metering wheel. This allows the operator to set the seed gate based on the seed size and population rate, to allow for even greater control of the population rates. The meter gate can also be used to shut off seed flow to an individual seed meter if desired. The JD 1990 CCS Air Drill features 3 optional meter rollers:
- The narrow black roller is recommended for low application rate crops such as sorghum.
- The medium-rate black roller is used for application rates of up to 89.7 kg/ha (80 lb/acre).
- The white high-rate roller is used for larger seeds and for high application rates. The white high-rate roller is also used for crops such as barley, oats and rice on 1990 CCS dual-rank models.
The metering rolls are interchangeable as well. Available metering bundles allow the operator to change over the complete meter assembly when changing crops from a high-rate crop to a lower population rate crop.
Dimensions
| Number of Sections | 3 |
| Transport Height | 11′ 11″ (3.63 m); 14′ 7″ (4.45 m); 14′ 11″ (4.55 m); 15′ 10″ (4.85 m) |
| Transport Width | 14′ 4″ (4.37 m); 18′ 4″ (5.59 m) |
| Road Clearance | 8.5 in (21.59 cm) |
| Overall Length | 24′ 7″ (7.49 m) |
| Centerframe Width | 11′ 5″ (3.48 m); 15′ 2″ (4.62 m) |
| Frame, Cross Members | 4 x 6 in (102 x 152 mm) |
| Frame, End Tubes | 2 x 6 in (51 x 152 mm) |
| Frame, Hitch | 3 x 6 in (76 x 152 mm) |
| Clearance from Rank to Rank | 52.8 in (134.11 cm) |
Operating Weight
| 7.5″ Spacing Weight | 18800 lb (8528 kg); 22300 lb (10115 kg); 24700 lb (11203 kg); 25700 lb (11657 kg) |
| 10″ Spacing Weight | 16700 lb (7575 kg); 19900 lb (9026 kg); 21900 lb (9934 kg); 22600 lb (10251 kg) |
Tires
| Mainframe (Standard Tire Size) | 8x 11L-15, 12 PR |
| Wings (Standard Tire Size) | 4x 11L-15, 8 PR |
Openers
| Style | Single disc no-till |
| Rank Lock-up | Front optional |
| Disk, Diameter | 18 in (45.72 cm) |
| Disk, Angle | 7 degree |
| Down Pressure, Style | Active hydraulic downforce |
| Down Pressure (10 in spacing) | 165 to 450 lb / opener (74.8 to 204.1 kg / opener) 165 to 400 lb / opener (74.8 to 181.4 kg / opener) |
| Depth Control, Description | Depth gauging wheel |
| Depth Control, Gauge wheel size | 4.5 x 16 in (11.43 x 40.64 cm) |
| Depth Control, Range | 0.5 – 3.5 in (1.27 – 8.89 cm) |
| Depth Control, Increments | 0.25 in (0.64 cm) |
| In-Furrow Press Wheel, Material | Semi-pneumatic rubber |
| In-Furrow Press Wheel, Packing force | 5 – 45 lb / 1 x 10 in (2.3 – 20.4 kg / 2.54 x 25.40 cm) |
| Furrow Closing, Description | 15 degree closing wheel |
| Furrow Closing, Size | 1 x 12 in (2.54 x 30.48 cm) |
| Furrow Closing, Material | Cast iron |
| Furrow Closing, Down force | 26-43 lb (11.8 – 19.5 kg) |
