| Model | 9870 STS |
|---|---|
| Years Produced | (2008-2012) |
| ENGINE† | |
| Horsepower, Rated - hp (kW) | 360 (268) |
| Horsepower, Maximum - hp (kW) | 385 (287) |
| Power Boost - hp (kW) | 25 (19) |
| Engine Make | John Deere 6 cyl 9.0 L |
| Piston Displacement - cu in (L) | 548 (9) |
| Emission Tier Level | Tier 3 |
| Fuel Tank Capacity - gal (L) | 250 (946) |
| Diesel Exhaust Fluid (DEF) Tank Capacity, gal (L) | No DEF |
| FEEDING SYSTEM† | |
| Drive | Fixed or Variable |
| Conveyor | Under-shot slat |
| Width - in (mm) | 55 (1397) |
| Length - in(mm) | 68-in. (1727mm) |
| Fixed Speed | 520 rpm |
| Variable Speed | 520-780 rpm |
| Reverser | Standard |
| Stone / Rock Protection | Stone Trap |
| THRESHING & SEPARATING SYSTEM† | |
| Threshing System Type, Rotary or Conventional Cylinder | Rotary |
| Number of Rotors or Cylinders | 1 Rotor |
| Rotor or Cylinder Description | Conical front, 15 elements, 18 tines |
| Rotor or Cylinder Diameter - in (mm) | 24 (610) |
| Rotor or Cylinder Length - in (mm) | 123 (3124) |
| Rotor or Cylinder Speed Range - rpm | 220 - 1210 |
| Threshing Area Wrap - degrees | np |
| Concave Adjustment | Electro-Mechanical |
| Concave Area | 1705 sq in. (1.1m2) |
| CLEANING SYSTEM | |
| Pre-Cleaner | 2968 (1.74m2) |
| Chaffer/Extension Area | 2934 sq in (1.89 m2) |
| Sieve Area | 2511 sq in (1.62m2) |
| Total Sieve Area - sq in (sq m) | 8143 sq in (5.25 m2) |
| Leveling System Available | Optional |
| Cleaning Fan Description | Centrifugal, 12 Blades |
| Cleaning Fan Speed Range - rpm | 620 - 1200 |
| GRAIN HANDLING SYSTEM | |
| Grain Tank Capacity, Standard - bu (L) | 300 (10572) |
| No optional tank | |
| Unloading Rate - bu/sec. (L/Sec) | 3.3 (116) |
| Unloading Auger Length, Standard - ft-in (m) | 22' 6" (6.86) |
| Optional Auger Length - ft-in (m) | 26' 0" (7.92) |
| Reach from Machine Center, Standard Auger - ft-in (m) | np |
| Reach from Machine Center, Optional Auger - ft-in (m) | np |
| TIRES and TRACKS | |
| Reference Drive Tire Size | 800/65 R32 |
| Steering Tire Size | 480/70 R30 |
| Rubber Tracks Available | No |
| WEIGHTS and DIMENSIONS, without Header | |
| Weight, 2WD - lb (kg) | 36,114 (16381) |
| Wheelbase, 2WD - in (mm) | 138 (3505) |
| Transport Height - ft-in (m) | 14' 9" (4.50) |