Specifications
Combines Category Spec Sheet
Combines are specialized agricultural machines designed to efficiently harvest a variety of grain crops. They combine the functions of reaping, threshing, and winnowing into a single, integrated process. Key specifications often focus on engine power, header width, and grain tank capacity to optimize harvesting efficiency.
AI-updated monthly · Last refresh 7/18/2026
Specifications by system
Engine
Horsepower150-650 hpDetermines power for harvesting and propulsion.
Fuel Tank Capacity100-350 galAllows for extended operation in the field.
Emissions TierTier 3 to Tier 4 FinalCompliance with environmental regulations, impacts older vs newer models.
Harvesting
Header Width15-45 ftWidth of the cutting platform for crop intake.
Grain Tank Capacity200-500 buVolume of threshed grain the combine can hold before unloading.
Threshing SystemRotor or Straw WalkerDifferent technologies for separating grain from straw.
Unloading Auger Speed2.5-4.5 bu/secRate at which grain can be transferred to a grain cart.
Dimensions
Overall Length (no header)25-35 ftLength of the combine body.
Overall Width (no header)10-15 ftWidth of the combine for transport and storage.
Overall Height12-16 ftHeight for transport and shed clearance.
Operating
Operating Weight30,000-60,000 lbsWeight of the machine with standard equipment and no crop.
Ground Speed (harvesting)1-6 mphTypical speed while actively harvesting crops.
Drive System2WD or 4WD HydrostaticType of drive, affects traction and maneuverability.
Cab
Noise Level68-75 dB(A)Internal noise level for operator comfort.
HVAC SystemStandard, Auto Climate ControlHeating, Ventilation, and Air Conditioning for operator comfort.
Weight classes
| Class | Weight range | Typical use |
|---|---|---|
| Small/Entry-Level | under 35,000 lbs | Smaller farms, diverse crops, lower acreage |
| Mid-Range | 35,001 - 50,000 lbs | Medium to large farms, common for corn and soybean |
| Large/High-Capacity | over 50,000 lbs | Large-scale commercial operations, high acreage, custom harvesting |
Common attachments
Grain Header (Platform Type)Corn HeadFlex Draper HeaderPickup HeaderChopping Corn HeadHeader TrailerGrain Tank ExtensionsYield MonitorsAuto Steer/GPS SystemsChaff Spreader
Typical price ranges
Used Older/Small
$30,000 - $150,000Typically 15+ years old, higher hours, smaller capacity models.
Used Mid-Range
$150,000 - $400,0005-15 years old, good condition, mid-capacity models with modern features.
New/Current Models
$400,000 - $800,000+Brand new or very low hours models, featuring the latest technology and highest capacities.
Buyer tip: When purchasing a combine, always verify the header compatibility with the machine and the condition of the threshing system components. Pay close attention to hours on the engine and separator as these are primary indicators of wear.