Krone BiG X 680

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The intake system  

  • Hydraulic drive: LOC steplessly adjustable from cab
  • 6 pre-compression rollers for a top quality chop
  • Perfect protection from foreign objects which travel a long path

On a precision forage harvester it is also the intake system that has an influence on the quality of chop. The 6 intake rollers on BiG X compress the material consistently at a high pressure so that it is easier and more precisely chopped. The hydraulic drive of the intake system allows operators to choose between setting the LOC manually or automatically.

The chopping assembly 

  • KRONE chopping drums with 20, 28, 36, 40 or 48 blades
  • High inertia: enclosed 660 mm (2'2") diameter drums
  • Bespoke 800 mm (2'7") wide drums for the BiG X 680, 780, 880 and 1180 models
  • Extremely fuel-efficient courtesy of a high inertia and pulling cuts

Matching the drum dimensions to the forager model and choosing the optimum number of blades not only boosts machine power but also makes the forager more flexible to suit more applications. The wide range of OptiMaize drums that are available for BiG X deliver top-quality chops in versatile applications anywhere in the world.

The KRONE OptiMaxx roller conditioners 

  • OptiMaxxroller conditioners with 250 or 305 mm (9" or 1') diameters
  • Slanted teeth for perfect conditioning to combine with OptiMaize S-XL drums
  • The gap between the rollers is conveniently adjusted from the cab
  • A strong spring assembly provides a consistent and high pressure
  • Maximum fracturing from an up to 50 % speed difference (option)
  • BusaCLAD-Special coating technology for maximum service life

Every single kernel must be cracked to achieve an optimal digestibility. These user demands are perfectly met by the new OptiMaxx 250/305 roller conditioners with their slanted teeth, a new KRONE development.


  • Optimaize is a versatile and unique system
  • Gearbox on the chopping drum switches flexibly from short cuts to long cuts
  • Switching the drum speed takes a few minutes
  • No downtime, no machine conversion, no up-front planning

Forming an integral part of the pulley, KRONE VariLOC is a gearbox that alters the speed of the chopping drum. By simply changing the drum speed from 1250 to 800 rpm using a standard open-end wrench, you can increase the chopping drum’s LOC range by up to 53%. This system allows operators to momentarily change from short to long chops and vice versa and meet different customer needs without a major changeover - this is the concept of OptiMaize. In conjunction with the roller conditioner with 105/123 teeth or with the disc conditioner, this technology turns the BiG X into a real all-round forage harvester that offers its owner and user maximum flexibility.


  • Fast changeovers from grass to corn conditioning and vice versa
  • A chain drive lowers the unit conveniently
  • The changeover takes just a few minutes
  • Fast and easy removal of the corn conditioner

VariQuick is the system that allows operators to converse BiG X very quickly from maize to grass. A chain drive (electric option) moves the corn conditioner out of or into the crop flow. If the corn conditioner is not used for longer periods of time, you can lower it and remove it from the machine by pulling it out to the side.


  • Consistently smooth performance despite inconsistent crop flows
  • Extremely smooth running – also in lumpy swaths
  • High throughputs
  • Top quality chop
  • Operator comfort to perfection

KRONE VariStream comprises a spring-loaded floor beneath the chopping drum and a spring-loaded back plate in the crop accelerator housing.The system ensures blockage-free and smooth operation, even in varying volumes of crop. The technology allows operators to utilise the forager to its limit and use less fuel per hour.


  • An adjustable crop throw at the touch of a button from the cab
  • Tight crop stream even with a long crop throw
  • The shorter the crop throw, the less power is needed
  • Fills the trailer accurately without spillage

The crop throw is controlled from the cab by adjusting the door in the backplate on the crop accelerator. This way, operators can adjust the throw quickly to the current filling situation. As the accelerator needs less power to cover a short distance, the Operator can free up engine output and use it for chopping and higher throughputs.

The headers 

  • Headers are swapped easily
  • Convenient attachment and removal
  • Very short set-up times
  • Compact combination
  • Maximum safety

The multi-coupler system of the BiG X allows operators to couple headers fast, easy and dependably from the seat, reducing changeover times when preparing for road travel or different crops. This way, more time is spent on productive work.

The engines 

  • 8- or 12-cylinder V-engines from Liebherr
  • Compact V design for transverse mounting
  • Final Tier 4 / Stage V compliant
  • 687-1156 hp maximum continuous engine power
  • High efficiency and quiet running

Advanced Common-Rail engine technology from Liebherr suggests superior outputs and fuel economy. The engines stand out for optimum torques, quiet running, superb fuel economy and high efficiencies.

The driveline

  • Simple design
  • An extra-strong poly V-belt transmits engine power to the crop assemblies
  • Long service life
  • Separate drive for the intake rollers and the headers: Rollers and headers are reversible if the chopping
    drum suddenly stops
  • Separate and dependable driveline to the ground drive pump

The transversely mounted engine allows the chopping drum and the crop accelerator to take engine power directly off a powerbelt. The engine also drives the pumps for the intake rollers and the header and also the pump for the ground drive and the assemblies. The power flows through a power take-off gearbox which uses a multiplate clutch to engage the assemblies.

The running gear

  • Front-wheel drive is standard; four-wheel drive is an option
  • Powerful wheel motors from Bosch-Rexroth
  • Traction control with three travel modes
  • High ground clearance powertrain

Wheel motors offer greater productivity and a higher level of automation and operator convenience. At the same time, this type of power train reduces maintenance and frees valuable space to fit a bigger and more powerful chopping assembly and move this further to the rear of the machine.

Super visibility and servicing

  • LED lights for best visibility at night
  • Optimum access to all service points
  • Large storage compartment for tools
  • Auto lubricator for more convenience

In the heat of harvest operators often work into the night. To ensure best visibility BiG X is equipped with a comprehensive light kit that turns night into day. Service and maintenance are made easy too thanks to wide opening side panels, an opening engine compartment cover, removable plastic mudguards and a ladder that swings out of the way to give easy access to all service points.

The multiple tank concept 

  • Seven different tank systems are available for maximum flexibility
  • Customers can opt for more fuel or more silage additives
  • Integral silage additive applicator with small/large dose rates as an option
  • Maximum fill capacities for long working days

A system of several tanks allows customers to specify the reservoirs on the machine to their needs – fuel, silage additive and water tanks can be added and configured in as many as seven different arrangements that meet individual needs around the world.

KRONE LiftCab 

  • Extremely spacious and quiet
  • Maximum seating and operator comfort
  • 360° panoramic view
  • Optimum visibility from the raised LiftCab (option)

It takes a comfortable working place to stay fit and alert during those long working days. The spacious Silent Space cab offers such an ideal environment. Providing generous space to the operator and a passenger, it provides a fully air-conditioning and an absolutely functional working place. The exclusive LiftCab offers an unprecedented panoramic view from a height of up to 70cm.  


Model   BiG X 680
Model number   Liebherr D 9508
No. of cylinders   8
Engine capacity Litres 16.16
Sustained engine power kW/hp 505 / 687
*** Max. continuous chopping output ()(-Power) kW/hp 487 /662
sustained Eco Power chopping output kW/hp 368 / 500
Tank capacity Litres 1,100 / 1. 500 as an option
SCR tank capacity Litres 150
Silage additive tank (small dose rate) Litres 275 / 505 option / 2 x13
Traction drive    
Model   infinitely variable hydrostatic drive with wheel motors for up to 40km/h
Sped in field mode km/h 0 - 25 (0 15.5)
Speedin road mode km/h 0 - 40 (0 - 24.9 mph)
Selectable anti slip control   Standard
4WD   Option
Steering angle on rear axle Degrees 50
Rear axle suspension   Hydraulic
Header   Infinitely variable
Pre-compression rollers   Infinitely variable
Pre-compression rollers    
Pre-compression roller throat volume   Funnel shaped
Serviceposition   Quick attach system (also with header attached)
No. of rollers/metal detector/no. of magnet coils   6 /Series/ 6
Metal detector counterblade distance mm 820 (2’8”)
Chop length adjustment   steplessly from cab (0.5 mm increments)
Chopping drum    
Drum width/diameter mm 800 / 660 (2'7" / 2'2 ")
Arrangement of blades   chevron style, at 11° to counterblade
No. of blades   20, 28, 36, 40, 48
LOC range mm 5-31 / 4-22 / 3-17 / 2.5-15 / 2-12
Cuts per minute   12,500 / 17,500 / 22,500 / 25,000 / 30,000
Stepless drum floor adjustment spring-loaded drum floor   Standard
Corn conditioner    
105/123 slanted teeth (optional HD, BusaCLAD   Option
123/144 slanted teeth (optional HD, BusaCLAD   Option
Speed differential % 30 / Optional 40/50
Roller diameter/clearance mm 250 / 0.5 - 7.0 (10" /0” - 0.3")
OptiMaxx 305    
125/150 slanted teeth (optional HD, BusaCLAD   Option
150/175 slanted teeth (optional HD, BusaCLAD   Option
Speed differential % 30/ optional 40
Roller diameter/clearance mm 305 / 0.5 - 7.0 (12" / 0" - 0.3")
Roller conditioners    
166 teeth: Sawtooth profile   Option
Roller diameter/clearance mm 250 / 0.5 - 7.0 (10" / 0" - 0.3")>
Roller width of all corn conditioners mm 710 (2'4")
Distance control from the cab in combination with automatic lubrication   Standard
Discharge accelerator    
Rotor diameter/width/no. of paddles   560 (22") / 710 (28") / 8
Paddle arrangement    arranged chevron-style
Speed   2,280
Stepless adjustment of the backplate / spring-loaded backplate   Standard
Angle of rotation Degrees 210°
Unloading Height m 6.00 (19'8")
Cross-section dimensions cm 34 X 23 (1'1" X 9")
Automatic mirror function/parking position   Standard
Rotary drive system   Gearboxes
Spout lined with wear plates throughout   Standard
Service & maintenance    
Auto lubricator with compressor   Standard
Self-diagnosing system via operator terminal   Standard
Air seat and buddy seat   Standard
Comfort air seat and buddyseat   Option
Climate control / with mobilecool box   Standard/ Option
Windscreen wipers on front and sides/ rear wiper / 3 side wipers   Standard/ Option
Length/width*/height* m 7.50 - 8.25 / 3.20 - 3.50 / 3.90- 3.98 (24'7" -27'1" / 10'6" - 11'6" / 12'9" -13'1")
Base machine weight (without header)** Approx. t 16.70
Weight distribution with EasyFlow 300 pick-up FIR% 57 / 43
Weight distribution with EasyCollect 750-3 (7.50 m ww) F /R % 60 / 40
Front axle       Standard****
680 / 85 R32
710 /75 R42
710 /70 R42
800 / 65 R32
800 / 70 R38
900 / 60 R32
900 / 60 R42
Rear axle Standard***
540 / 65 R30
620 / 70 R30
710 / 60 R30
EasyFlow pick-up: m 3.00 - 3.80 (9'10" – 12’6")
EasyCollect variable row width header m 4.50 / 6.00 / 7.50 / 9.00 / 10.50 (14'9" / 19'8" / 24'7" / 29'6" / 34' 5")
EasyCollect variable row width header m 6.00 / 7.50 / 9.00 (19'8" / 24'7" / 29'6")
Autopilot and active ground contouring for EasyCollect m Option
XDisc: the direct cut head m 6.20 (20'4")