AGCO Allis 6680 Tractor 79 hp Specifications, Features, and Performance Overview
AGCO Allis 6680 Tractor 79 hp
The AGCO Allis 6680 is a 79-horsepower farm tractor designed for reliable fieldwork and general utility. You get a unit built on proven engineering and backed by a reputable manufacturer in agricultural equipment.
Production & Identification
You can identify the AGCO Allis 6680 by its distinct color scheme and clear labeling on the hood. This model is known for its robust build, designed to handle demanding work on farms and in fields.
The tractor’s 79-hp engine delivers proven performance in tasks such as plowing, planting, and transporting loads. This tractor was produced as part of the AGCO Allis lineup, which combined American and European designs.
Dealers often listed the tractor’s horsepower and series name when selling or servicing these units. Official identification can be verified using the model and serial numbers, which are clearly marked on the tractor frame.
The 6680 is available in two-wheel drive (2WD) and sometimes four-wheel drive configurations. The layout and style make it easily distinguishable from other models.
When checking equipment, always match the serial number and model stickers to ensure you have a genuine AGCO Allis 6680.
| Production Aspect | Details |
|---|---|
| Horsepower | 79 hp |
| Drive Type | 2WD (sometimes 4WD) |
| Engine Type | Diesel |
| Distinguishing Marks | Model/serial stickers, AGCO Allis colors |
Manufacturer / Brand
AGCO, the manufacturer, is recognized for durability and innovation in agricultural machinery. The AGCO Allis brand was used in the early to mid-1990s as AGCO expanded and merged with other well-known companies, including Deutz-Allis and Massey Ferguson.
Your AGCO Allis 6680 reflects a period in the company’s history marked by consolidation in the industry. The parent company, AGCO Corporation, is based in Duluth, Georgia, United States.
AGCO owns several other brands such as Massey Ferguson, Fendt, and Challenger. The AGCO Allis sub-brand represented models made for both American and international farmers.
If you want support or information, AGCO’s broad dealer network can still provide parts and service for these tractors. Branding on the 6680 is clear, with large “AGCO Allis” logos on the bodywork.
This branding represents a bridge between older Allis-Chalmers technology and modern AGCO engineering.
| Manufacturer Aspect | Details |
|---|---|
| Manufacturer | AGCO Corporation |
| Brand Used | AGCO Allis |
| Other AGCO Brands | Massey Ferguson, Fendt, Challenger |
| Country | United States (headquarters) |
| Dealer Support | Yes, through AGCO network |
Model Number / Series
The model number 6680 is part of the AGCO Allis 6000 Series. You can identify this series by the four-digit numbering system, where the first two digits generally correspond to the series, and the last two to engine power or order within the series.
The 6680 sits in the middle of the range, providing a balance of power and size. You will find similar models like the 6690 or 6670, but only the 6680 provides the specific 79-horsepower rating.
When buying attachments or parts, always specify both the model and series to ensure proper fit and compatibility. The 6000 Series combines classic Allis-Chalmers design with features brought in by AGCO.
| Model Info | Description |
|---|---|
| Series | 6000 Series (AGCO Allis) |
| Model Number | 6680 |
| Comparable Models | 6670, 6690 |
| Power class | Mid-range |
| Engine Power | 79 hp (66.8 kW) |
Factory of Manufacture
You will find that the AGCO Allis 6680 was manufactured in a European factory. Most sources link production to facilities in Italy, which supplied tractors not only for North America but also for other markets.
The factory leveraged advanced engineering from European models and customization for American requirements. Tractors built at this plant had to meet strict quality standards.
The plant produced models under the AGCO Allis badge, but similar units may appear under brands such as SAME or Deutz-Fahr in other regions. When checking the origin, you can usually confirm “Made in Italy” on the identification plate or serial number area.
Local dealers often mention the European factory as a point of distinction for this model. They highlight solid construction and imported parts.
| Factory Aspect | Details |
|---|---|
| Location | Italy (main factory) |
| Other Brands Assembled | SAME, Deutz-Fahr equivalents |
| Market Supplied | North America, international |
| Identification Plate | Usually states “Made in Italy” |
| Quality Standards | European and American regulations |
Years Produced
The AGCO Allis 6680 was produced throughout the early and mid-1990s. Production started after the AGCO acquisition of existing brands and continued as part of their updated tractor line.
Most records show 1992 as a common start year, with manufacturing running until about 1997. Checking the year-by-year changes, you will see few major updates, as the model was consistent in design.
The 6680 was popular during its run, often seen in sales literature from the mid-1990s. If you are buying a used 6680 today, it likely comes from this five-year window.
Serial number guides or AGCO dealers can give you precise production dates if you have the full serial number.
| Year | Range |
|---|---|
| Initial Launch | 1992 |
| Final Year | 1997 |
| Production Span | About 5 years |
Original List Price (Launch Year)
When the AGCO Allis 6680 was first introduced, it was positioned as a mid-range tractor. The original list price varied depending on configuration and optional accessories.
In the early 1990s, most new units sold for around $30,000 to $35,000 USD. This range depended on factors like whether you chose two-wheel or four-wheel drive, extra hydraulics, air conditioning, or cab style.
Prices could fluctuate based on the dealer location and currency exchange rates at the time due to European manufacturing. Many farmers compared the price with similar models from Massey Ferguson and other brands.
| Price Aspect | Range/Value |
|---|---|
| Launch Price | $30,000 – $35,000 USD |
| Factors Impacting | Options, drive type, accessories |
| Comparison Brands | Massey Ferguson, Deutz-Fahr |
Serial-Number Location
To find the serial number on your AGCO Allis 6680, look on the right-hand side of the main tractor frame, just below the engine area. The serial number is stamped on a metal plate attached to the frame, which also includes other identification information.
This location makes it easy to reference for parts orders, service, or verifying the history of your machine. When inspecting a used model, always cross-check the serial number against records for proof of model year and authenticity.
Some units may have a second identification or VIN plate inside the cab or on the firewall. Always write down the full number when doing paperwork or contacting an AGCO service center.
| Serial Number Info | Details |
|---|---|
| Location | Right side of the main frame, below engine |
| Plate Material | Metal with stamped numbers |
| Additional Plate | Sometimes in cab or on firewall |
| Use | Model verification, dealer service, parts |
Engine Specifications
The AGCO Allis 6680 tractor uses a robust diesel engine built for efficiency and durability. Important details include the engine’s model, technical specifications, fuel characteristics, and performance measures.
Engine Make & Model
You will find that the AGCO Allis 6680 is powered by a diesel engine developed by Perkins. This is the Perkins A4.248 engine, which is a reputable model known for its longevity and steady power output.
The Perkins brand is widely recognized in agricultural machinery, offering dependable performance in demanding field conditions. The engine’s design uses direct injection to optimize fuel efficiency and cold-start capability.
When comparing with other tractors in this class, Perkins delivers a good balance between power and maintenance intervals. Parts and service are also commonly available, making upkeep simpler for owners.
Fuel Type & Emissions Tier
The 6680 operates solely on diesel fuel. This fuel type is standard for most agricultural tractors in the 79 hp range due to its high energy density and cost-effectiveness.
Diesel also allows for better fuel consumption rates in long-duration field work. This tractor, produced before the widespread introduction of modern emission regulations, does not include advanced emissions-control systems such as DEF (Diesel Exhaust Fluid) or particulate filters.
You are not required to use ultra-low sulfur diesel, though it may be beneficial for engine longevity. Emissions should be checked locally, as requirements might differ by region, especially if the tractor will be operated in areas with environmental guidelines for off-road equipment.
Cylinders / Displacement
The engine in the AGCO Allis 6680 is a 4-cylinder model. This inline configuration provides a good mix of consistent power and manageable vibration.
Four-cylinder models are common in mid-sized tractors due to their durability and smooth operation. The displacement for this engine is 4.1 liters, or 248 cubic inches.
Displacement refers to the total volume swept by all pistons inside the engine and has a direct effect on power output. The 4.1 L displacement allows the tractor to generate solid torque at low RPMs, which is necessary for field work and heavy-duty applications.
Rated Horsepower (Gross & Net)
You can expect the AGCO Allis 6680’s engine to produce a gross power rating of 79.27 horsepower (hp), or about 59.1 kilowatts (kW) at its rated RPM. Gross horsepower measures the engine’s output without any load from accessories.
PTO (Power Take-Off) horsepower is an important figure for tractor users, as it indicates power available for implements. The tested PTO horsepower is 72.7 hp (54.2 kW).
This is the figure you should use when matching the tractor to equipment or planning on operating attachments that draw engine power. The drawbar-tested horsepower is about 62.1 hp, giving you a sense of what is delivered to the wheels during pulling tasks.
Peak Torque (Nm @ rpm)
Peak torque is the highest twisting force the engine can provide, which is crucial for heavy-duty tasks like tillage or pulling. The engine’s peak torque rating is not always published for this specific tractor, but with a displacement of 4.1 L and the given horsepower, you can estimate it.
Typically, a tractor of this size and engine would deliver peak torque in the ballpark of 270-290 Nm at approximately 1,400 to 1,600 rpm. This strong, low-speed torque makes it easier to handle tough ground conditions and maintain engine stability under varying workloads.
The tractor’s manual or technical documentation may provide a more precise figure, so check with the manufacturer if you need exact torque specifications.
Compression Ratio
The engine in the AGCO Allis 6680 operates with a compression ratio of 17:1. This ratio describes the difference in volume in the cylinder at the bottom of the piston’s stroke compared to the top.
A 17:1 compression ratio is standard for diesel engines, helping maximize fuel efficiency and combustion. Higher compression ratios like this also enable the engine to start reliably in cold weather, as pressure and temperature inside the cylinder rise enough for the diesel fuel to ignite without spark plugs.
Compression affects power, fuel consumption, and engine noise, so this figure is crucial for understanding performance.
Cooling System & Capacity
Effective temperature management is important for agricultural equipment used in continuous operations. The AGCO Allis 6680 uses a liquid-cooled system.
This type of system moves coolant around the engine to transfer heat away from internal parts. The cooling system’s capacity is generally around 13-16 liters (3.4-4.2 US gal) for a tractor of this model, though you should check your owner’s manual for the exact figure.
Adequate cooling reduces engine wear and helps prevent downtime on hot days or during intensive tasks. You should inspect the coolant level regularly and use the recommended mix for your climate to prevent overheating or freezing.
AGCO Allis 6680 Engine Specification Table
| Parameter | Specification |
|---|---|
| Engine Make & Model | Perkins A4.248 |
| Fuel Type | Diesel |
| Emissions Tier | Pre-modern emissions; no DEF/DPF required |
| Number of Cylinders | 4 (inline) |
| Displacement | 4.1 L (248 cu in) |
| Rated Gross Horsepower | 79.27 hp (59.1 kW) |
| PTO Horsepower (Claimed) | 72.7 hp (54.2 kW) |
| Drawbar Horsepower (Tested) | 62.1 hp (46.3 kW) |
| Peak Torque (Estimated) | 270–290 Nm @ 1,400-1,600 rpm |
| Compression Ratio | 17:1 |
| Cooling System | Liquid-cooled |
| Coolant Capacity | 13–16 L (3.4–4.2 US gal) |
Power Take-Off (PTO)
The PTO system on the AGCO Allis 6680 lets you use a range of powered implements. You can connect and run different tools efficiently with its specific features and settings.
Claimed PTO Horsepower
The AGCO Allis 6680 is rated for 79 horsepower at the engine. The PTO horsepower is slightly less because of power loss between the engine and PTO shaft.
You can generally expect about 70–75 PTO horsepower from this model. This means you have enough power to run most medium-sized equipment.
Common tools that match well with this PTO output include hay balers, rotary mowers, grain augers, and tillers. Knowing the PTO horsepower helps you match implements to the tractor’s capabilities.
PTO horsepower is an important factor if you plan to use the tractor for heavy-duty or high-power-demand tasks. Insufficient PTO power can reduce equipment performance.
Be sure to check your implement’s requirements before running them on the 6680.
PTO Type (Independent / Live / Economy)
The AGCO Allis 6680 has an independent rear PTO. This means you can control the PTO separately from the transmission and tractor movement.
You start and stop the PTO with a dedicated control, even if the tractor is not moving. An independent PTO is useful for tasks that require frequent stopping and starting, such as baling or mowing.
The 6680’s design includes a hydraulic wet disc clutch for the PTO. This setup offers smoother operation and helps protect both tractor and implements from sudden power surges.
Independent PTOs are easier to use and safer than earlier live PTOs, which required the clutch to operate. With the independent setup, you get more flexibility and control over how and when you power your implements.
PTO Speeds (540 / 1 000 rpm)
The AGCO Allis 6680 features a dual-speed rear PTO. You can choose between 540 rpm and 1,000 rpm settings.
This flexibility allows you to operate a wide range of implements. The 540 rpm speed is standard for many small to mid-size implements like mowers and post hole diggers.
The 1,000 rpm speed is suited for larger, more power-hungry tools such as large balers, forage harvesters, or certain pumps. You select the speed via a lever or switch, depending on how your tractor is equipped.
Using the correct PTO speed matches the implement’s needs, prevents damage, and improves efficiency. Running a tool at the wrong rpm can either overwork your equipment or cause poor performance.
| Feature | Specification | Details |
|---|---|---|
| Claimed PTO HP | ~70–75 horsepower | Suited for medium-sized implements |
| PTO Type | Independent (hydraulic wet disc clutch) | Separate control from tractor movement; smoother use |
| PTO Speeds | Dual (540 rpm and 1,000 rpm) | Handles both small and large equipment |
| Common PTO Uses | Rotary mowers, balers, augers, tillers, forage harvesters | Offers flexibility with many implement types |
Transmission & Drivetrain
The AGCO Allis 6680 offers a robust transmission and drivetrain setup that supports heavy farm work and ensures smooth operation in the field and on the road. Key details include a partial power shift transmission, a high number of gear selections, and a dependable 2WD system.
Transmission Type (Syncro, Powershift, CVT, HST)
The AGCO Allis 6680 uses a partial power shift transmission. This type of transmission gives you more flexibility compared to basic manual setups.
With a partial power shift, you can change between certain speeds or gear ranges without pressing the clutch or fully stopping the tractor, saving effort and making shifting smoother. Power shift systems are valuable for jobs that require frequent changes in speed or power, as you often do in fieldwork or while transporting loads.
You will notice this benefit most when moving between fields, starting heavy implements, or driving on uneven ground. This transmission is not a full powershift, which would allow shifting all gears without using the clutch, but it is more convenient than traditional syncro-shift setups.
Full Continuously Variable Transmissions (CVT) and Hydrostatic (HST) systems are not available on this model, focusing instead on durability and ease of repair.
Number of Gears / Ranges
You get a total of 30 forward and 30 reverse gears in the AGCO Allis 6680, giving you a wide range of speeds and power options for every job. The transmission is organized with five gears (1-5) in each of three ranges – Low (L), Medium (M), and High (H).
Each range allows you to select the best speed for your situation, whether you are plowing, planting, or hauling. There is also a high-low power shift, which means that within each gear you have an extra step up or down, providing more choices.
This setup makes it easy for you to match your speed to the job at hand without losing efficiency or increasing wear. Changing between so many gears gives you control when operating on slopes, soft ground, or during precise fieldwork.
The large number of gears also helps you avoid overworking the engine, saving fuel and preventing breakdowns.
Top Transport Speed
The AGCO Allis 6680 is built for solid, steady transport but does not have the very high road speeds of some modern tractors. In typical setup, your top transport speed is about 30 km/h (approximately 18-19 mph).
This allows for efficient travel between fields or back to the farm, especially if you have several miles to cover. While faster road speeds can save a bit of time, most work is done at lower speeds.
This transport speed balances safety with getting you to your destination in reasonable time. With proper tires and careful loading, you will find the ride stable and predictable on regular farm roads.
For farmers with nearby fields or who often tow heavy loads on the road, this speed is generally sufficient. Slower speeds also help reduce risk of wear or damage.
Drive (2WD / 4WD / AWD)
The AGCO Allis 6680 comes with 2-wheel drive (2WD) as the standard option. This means power from the engine is delivered mainly to the rear wheels.
This setup is simple and reliable, making it easier to maintain and less expensive to repair. In dry, level fields or on paved surfaces, 2WD offers good traction.
However, if you often work in muddy or hilly terrain, 4WD is usually preferred. Some versions of the 6680, depending on where you buy or order, may have 4WD (or MFWD), but 2WD is the most common form you will see in the field.
If you need more traction for heavy tillage or for pulling large implements, you should look for a model with 4WD or consider adding rear tire weights or dual wheels to improve grip.
Differential-Lock & Final Drives
The AGCO Allis 6680 includes a differential lock feature. A differential lock enables you to lock both rear wheels together so they turn at the same speed.
This is especially helpful if you get stuck or need extra grip in slippery field conditions. You usually engage the differential lock by foot pedal.
It is simple to use and increases traction without causing extra wear when used properly. You will appreciate this feature when working in wet fields or climbing over loose soil.
Final drives in this tractor are robust and built to handle the power produced by the 79 horsepower engine. They transfer power smoothly to the ground and rarely need major service if you keep up with basic maintenance.
They are designed with strength and reliability in mind, giving you long service life.
Transmission & Drivetrain Summary Table
| Feature | Details |
|---|---|
| Transmission Type | Partial power shift |
| Gear Selection | 30 forward, 30 reverse (5 gears × 3 ranges × hi-lo) |
| Gear Ranges | Low, Medium, High |
| High-Low Range Shift | Yes |
| Top Transport Speed | ~30 km/h (~18-19 mph) |
| Standard Drive | 2WD (some 4WD options possible) |
| Differential Lock | Yes (manual foot pedal) |
| Final Drives | Heavy-duty, built for reliability |
Steering & Brakes
The AGCO Allis 6680 tractor uses a combination of modern and durable steering and braking systems. These components help you control the tractor more safely and comfortably, especially when working in challenging conditions.
Steering System (Hydrostatic / Power-Assisted / Mechanical)
The AGCO Allis 6680 comes equipped with a hydrostatic power steering system, which is also referred to as power-assisted steering. This system makes turning the tractor easier, even at slow speeds or when the front axle is carrying heavy loads.
You do not have to use much physical effort to steer, helping you maneuver in tight spaces or during long hours of operation. The steering column is adjustable, allowing you to set your preferred position for comfort.
With power steering, you can maintain precise control, which is important when aligning implements or operating on uneven ground. The hydrostatic system relies on a hydraulic pump and fluid, making steering movements smooth and consistent in most working situations.
Turning Radius (With Brakes)
The turning radius of the AGCO Allis 6680, especially when using brakes, allows you to make tighter turns in the field or on the farm. With the help of individual rear braking, the turning radius is greatly reduced.
This is useful for headland turns or when space is limited. When you apply the brake to only one rear wheel, the tractor pivots more sharply.
This feature helps you save time and avoid extra maneuvers when working on row crops or around obstacles. Precise numbers for the exact turning radius may depend on your tire setup and whether your tractor has two-wheel or four-wheel drive.
However, using the brake-assisted turning function is a key advantage for improving maneuverability.
Service Brakes (Wet Disc, Dry Drum, etc.)
The AGCO Allis 6680 features hydraulic wet disc brakes on the rear wheels. Wet disc brakes operate in a sealed oil bath, which reduces wear and helps keep the braking system cool, even with frequent or heavy use.
This type of brake gives you more consistent stopping power and longer service life compared to dry drum brakes. The brakes are foot-actuated, letting you control each rear wheel individually for tight turns or stopping on slopes.
Wet disc brakes also work well in muddy or wet conditions, as the sealed design keeps dirt and moisture away from the braking surfaces.
Parking Brake Type
For secure parking, the AGCO Allis 6680 is fitted with a mechanical parking brake. This brake is usually a lever you pull inside the cab, which locks the rear wheels and prevents rolling when the tractor is parked.
The system is mechanically linked and operates independently of the main service brakes. You can safely park the tractor on slopes or uneven ground without worrying about accidental movement.
Engaging the parking brake is simple and does not require electrical or hydraulic power. If you leave the tractor for maintenance or loading, the parking brake helps keep everything steady until you are ready to move again.
| Feature | Type/Function | How It Helps You | Main Benefits |
|---|---|---|---|
| Steering System | Hydrostatic (Power-Assisted) | Easier/less effort to steer | Smooth control, less fatigue |
| Turning Radius (With Brakes) | Brake-assisted sharp turns | Tighter turns in limited spaces | Better maneuverability |
| Service Brakes | Hydraulic Wet Disc | Even, reliable stopping; less wear | Safer operation, durability |
| Parking Brake Type | Mechanical lever (independent from service) | Locks rear wheels when parked | Secure parking, simple design |
Cab & Operator Station
Comfort, safety, and control are important when using the AGCO Allis 6680 tractor. Attention to cab features, operator seating, and climate systems support your productivity and reduce fatigue.
ROPS / Cab Option
The AGCO Allis 6680 offers a ROPS (Roll Over Protection Structure) as a standard feature for safety in open-air operation. You can choose a fully enclosed cab version for additional protection from weather and dust.
The cab model provides sturdy doors, glass windows, and a lockable entry. A ROPS frame protects you in case of a rollover and meets farm safety standards.
The cab includes sound insulation, tighter seals, and durable materials for long life and comfort. Wide side mirrors and low-profile window frames improve visibility from the operator’s seat.
Steps and handrails mounted on the tractor body help you enter and exit the station safely. Simple latches and handles let you open the cab doors from inside and outside.
Adjustable steering columns make it easier for you to find a comfortable driving position.
Climate Control (A/C, Heater, Filter)
The enclosed cab models of the AGCO Allis 6680 come with a full climate control system. Air conditioning is available for hot weather, allowing you to cool the cab quickly during summer work.
Adjustable vents deliver cool air throughout the cabin. You can change fan speed and temperature by simple controls.
A factory heater lets you warm the cabin during cold conditions. This helps you stay productive in late fall, winter, or early spring.
The heater system includes controls within arm’s reach so you can experience comfort without distraction. Cab air is filtered to reduce dust, pollen, and crop debris.
The filtration system requires periodic cleaning or replacement to keep airflow strong. With all windows and doors closed, the pressurized cab keeps fine particles out, supporting cleaner air as you work.
Seat & Suspension
The operator seat is fully adjustable to support different body sizes and preferences. Forward and backward sliding allows you to reach pedals and levers with ease.
You can also adjust backrest angle and sometimes lumbar support for better posture during long jobs. Many models feature a mechanical or springs-based suspension seat.
This suspension helps absorb shocks from rough terrain, reducing the impact on your back and legs. Armrests and a swivel function let you turn to monitor implements and make frequent adjustments.
Controls for the seat’s height and distance are manual, but simple to use. Some versions include padded cushions, heavy-duty fabric covers, and replaceable seat covers for extra durability and easy cleaning.
Safety belts are attached to all operator seats.
Noise Level (dB A @ Operator Ear)
The closed cab on the AGCO Allis 6680 has sound insulation in the roof, floor, and door panels. This reduces engine and transmission noise at the operator’s ear.
During full load operation, the sound level inside the cab typically ranges between 75 to 85 dB(A). With the doors and windows closed, you experience a quieter environment compared to open station tractors.
This contributes to less fatigue and better long-term hearing protection during full-day use. If you choose the ROPS-only version, expect a noticeable increase in engine and implement noise.
Hearing protection is not always needed in the insulated cab, but is recommended in open configurations. Regular maintenance like sealing doors and replacing gaskets keeps noise levels down.
| Feature | ROPS/Open Station | Enclosed Cab |
|---|---|---|
| Protection | Basic ROPS frame | ROPS + full enclosure |
| Climate Control | Not Available | A/C, Heater, Filtered Air |
| Seat Adjustment | Manual, sliding | Manual, sliding, suspension |
| Noise Level (dB A) | 85+ | 75–85 |
| Visibility | Open view, mirrors | Glass windows, mirrors |
| Controls | Basic | Ergonomic, within arm’s reach |
| Access | Steps, handrails | Steps, handrails, doors |
Hydraulics
The AGCO Allis 6680 comes with a hydraulic system that supports the operation of its implements and steering. This system affects how well your tractor handles attachments and performs tasks like lifting, hauling, and steering.
System Type (Open-Center / Closed-Center / PFC)
Your AGCO Allis 6680 features an open-center hydraulic system. In this type of system, hydraulic oil flows through the valve back to the reservoir at all times unless a control valve is activated.
Open-center systems are known for being simple and reliable. There are fewer internal restrictions, which means maintenance needs are usually lower.
However, they don’t offer the same fast response as pressure-flow compensated (PFC) or closed-center systems. For most tasks like loader work or running common implements, this open-center setup is effective and straightforward.
When you use the hydraulics, you may notice the pump runs constantly until pressure is needed for an action. This design is common in tractors this size and age, giving you ease of use but not as much efficiency as more advanced systems.
Implement Pump Flow (L min⁻¹)
The implement pump flow for the AGCO Allis 6680 is about 57.5 liters per minute (L/min), based on the system’s total hydraulic capacity. This flow rate determines how quickly your implements operate, such as raising a loader bucket or moving a hydraulic cylinder on attachments.
A flow of around 57.5 L/min offers steady performance for most common farm activities. It is suitable for jobs like baling, spreading, or working with smaller front-end loaders.
If your implements require more rapid or heavy-duty hydraulic action, knowing the pump flow helps ensure you have the capacity needed. Tractors with higher flow rates generally operate larger cylinders faster, but for most standard implements, the 6680’s pump flow is adequate.
Steering Pump Flow (If Separate)
On the AGCO Allis 6680, the steering may be served by the same open-center system or could have a separate pump depending on the exact configuration. Many tractors in this class share a single hydraulic circuit for both implement and steering functions.
If it uses a separate steering pump, the flow rate is usually lower than the implement pump, often around 20 to 30 L/min. This is enough to give you smooth, easy steering in the yard and field.
When the system is shared, high demand from implements can momentarily slow steering, so be mindful if running large hydraulic loads. Routine maintenance like checking filters and fluid can help keep steering performance reliable.
Total Combined Flow
The total combined hydraulic flow brings together the output of all hydraulic pumps—implement and steering. For the AGCO Allis 6680, total flow typically matches the listed implement pump capacity, as some units use a single main pump for both functions, estimated at around 57.5 L/min.
Having one flow figure simplifies maintenance and makes it clear how much hydraulic power is available overall. This combined output sets the upper limit for running all your hydraulic functions at once.
If you’re using multiple hydraulic functions, the system divides the flow between them. While you may not notice issues with small attachments, running several high-demand tools at once could slow each function.
System Pressure (bar / psi)
Hydraulic system pressure in the AGCO Allis 6680 typically ranges around 180 bar (about 2,600 psi). This pressure level tells you how much force the hydraulic system can deliver.
Higher pressure allows the tractor to lift heavier loads or operate tough implements. Knowing your system pressure helps when selecting attachments that list a minimum required hydraulic pressure.
Staying below the maximum rated pressure is important for safety and longevity. If you’re experiencing weak hydraulic performance, checking pressure may help diagnose issues like worn pumps, high-resistance hoses, or faulty valves.
Regularly checking hydraulic fluid condition also helps maintain system pressure.
Remote Valves (Number & Type)
Your AGCO Allis 6680 is generally equipped with two rear remote valves. These valves let you connect hydraulic hoses from implements such as loaders, mowers, or bale wrappers.
Having multiple remotes gives you flexibility with attachments that have more than one hydraulic function. The remotes are usually double-acting valves, which means oil can be sent either way through the attached hoses.
This setup is ideal for cylinders that need to extend and retract. Some models offer more hydraulic remotes as optional equipment, which can be useful if you often run multi-function tools.
The type and number of remotes help determine which implements you can use at the same time.
Hydraulics System Summary Table
| Feature | Value / Description |
|---|---|
| Hydraulic System | Open-center |
| Implement Pump Flow | ~57.5 L/min |
| Steering Pump Flow | Typically shared or separate, ~20–30 L/min (if split) |
| Total Combined Flow | ~57.5 L/min |
| System Pressure | 180 bar / 2,600 psi |
| Remote Valves | 2 double-acting rear remotes (typical) |
Three-Point Hitch (3PH)
You can expect solid performance from the AGCO Allis 6680’s three-point hitch system. This tractor provides farm operators with reliable hitch features that make attaching and using a wide range of implements straightforward.
| Feature | Specification |
|---|---|
| Hitch Category | Category II / I |
| Lift Capacity (at ball ends) | 6,790 lbs (3,079 kg) |
| Draft/Position Control | Position and draft control, lower-link sensing |
| Top-Link Sensing | No |
Hitch Category (1 / 1N / 2 / 3)
The AGCO Allis 6680 tractor comes with a Category II three-point hitch as its main standard. Category II hitches use pin diameters of 1 inch (lower link) and 0.875 inch (top link), which are common for medium-sized row crop tractors in this horsepower range.
You can also use Category I implements with the right bushings or adapters, giving you more flexibility. Most implements snap on easily, making it simple to switch attachments for different jobs.
The spacing between the lower link arms fits a wide array of farm tools, including plows, harrows, and seeders. Category II hitches are designed for heavier-duty applications than Category I, so you can safely handle larger implements.
This makes the AGCO Allis 6680 suitable for tasks such as tillage, haying, and planting.
Lift Capacity @ Ball Ends
The three-point hitch on your AGCO Allis 6680 provides a maximum lift capacity of 6,790 lbs (3,079 kg) at the ball ends. This strong rating means that you can manage a variety of implements—heavy or light—without overloading the tractor.
This capacity includes the weight of the implement and any materials attached to it. You can use larger plows, cultivators, or mowers without sacrificing control or safety.
The lift system uses hydraulic power, which gives smooth and reliable operation when raising or lowering implements. It’s important to stay within the limit to avoid putting stress on the hitch or hydraulics.
Always check the implement’s weight before attaching it and use the lift arms correctly to keep the tractor balanced.
Draft / Position Control
Your AGCO Allis 6680 is equipped with both position control and draft control using lower-link sensing.
Position control allows you to lift and lower implements to a set height, which is useful for jobs like grading or mowing where consistency is important. You move the lever to the height you want, and the tractor holds it steady.
Draft control measures the resistance faced by an implement in the soil. If the plow or tiller meets more resistance (like hitting a tough patch), the system automatically raises the implement slightly to avoid bogging down.
Once resistance drops, the implement returns to its original depth. Lower-link sensing means the hitch uses feedback from the lower lift arms to adjust implement position.
This results in smoother field work and less manual adjustment, especially in changing soil conditions.
Top-Link Sensing (Yes/No)
Top-link sensing is not available on the AGCO Allis 6680. Instead, hitch sensing is done at the lower lift arms.
Top-link sensing adjusts implement depth by feeling the force at the top link, but this tractor relies on lower-link feedback. For most operations, lower-link sensing offers accurate results, especially with plows, tillers, and similar soil working implements.
If you need extreme precision for specialized implements that require top-link sensing, you may want to look at tractors with that option. Using only lower-link sensing is common for tractors in this size and power range.
It is suitable for a wide range of agricultural tasks and matches up with the needs of typical row-crop and mixed-use farms.
Axles & Load Limits
Understanding the axle limits and drive systems of the AGCO Allis 6680 helps you ensure safe operation, maintain tractor integrity, and avoid mechanical issues. You can plan heavy tasks and equipment transport better by knowing these specifics.
| Feature | Specification | Details |
|---|---|---|
| Maximum Front-Axle Load | ~3,300 kg (estimate) | Supports loader and equipment weight |
| Maximum Rear-Axle Load | 5,200 kg | Handles heaviest implement weight |
| Rear Axle Design | Flange | For stability and support |
| Final-Drive Type | Outboard planetary, open center | For strong, reliable power transfer |
Maximum Front-Axle Load (kg)
The AGCO Allis 6680’s front axle must support engine weight, front implements, and added ballast. While an exact number is not specified by all sources, it’s reasonable to estimate the maximum load near 3,300 kg.
This is based on the tractor’s shipping weight and the typical load supported by tractors in this class. If you use a loader or heavy front-mounted attachments, always check the weight of your equipment plus any ballast.
Exceeding the maximum front-axle limit can lead to poor steering, increased tire wear, and risk of axle failure. It’s also important to distribute the weight evenly if you are adding front ballast.
Always consult your manual or dealer to confirm allowed front axle loads for your specific setup.
Maximum Rear-Axle Load (kg)
The rear axle of the AGCO Allis 6680 has a maximum capacity of 5,200 kg. This figure includes the weight of the tractor, operator, any fluids in the tires, and any equipment or loads carried by the rear.
You should never exceed this limit when towing implements or mounting heavy attachments. The rear axle is built to withstand heavy use and is designed for large tools such as plows, planters, or trailers.
Be sure to check the weight of what you attach and include any extra cargo or gear.
Final-Drive Type
The final-drive system on the AGCO Allis 6680 uses an outboard planetary setup. This design delivers power to the wheels efficiently and is preferred for its durability under heavy agricultural workloads.
The outboard planetary reduction gears are mounted outside the axle housing, letting them handle greater torque without adding bulk to the inboard workings. A flange-type rear axle increases stability by securing the wheel directly to the axle flange.
This makes changing wheels easier and improves the ability to manage heavy implements. The hydraulic power is delivered via an open-center system, which is typical for this size of tractor and provides constant oil flow for smooth steering and implement operation.
Regular maintenance and using the tractor within specified load limits keeps the final-drive components in good condition.
Tires & Track Options
You can set up the AGCO Allis 6680 tractor with different tire sizes based on your specific needs. This includes changing the front and rear tires for better traction or flotation, and adding duals or flotation kits for extra stability in different field conditions.
Standard Front Tire Size (Ag / Turf / Industrial)
The standard front tire size for the AGCO Allis 6680 depends on whether your tractor is 2WD or 4WD. For the 2WD model, you usually get 7.50-18 agricultural tires.
These are designed for good grip in fields and dirt roads. If you have the 4WD version, the front tires are larger: 14.9R24.
This wider size gives you better traction, especially in wet or uneven ground. Both standard sizes are aimed mainly at agriculture, so you may need different tires for turf or industrial work.
Turf tires reduce ground damage on lawns and sports fields, while industrial tires provide stronger sidewalls for heavy work. Here’s a summary:
| Drive Type | Ag Tire Size | Turf Tire Options | Industrial Tire Options |
|---|---|---|---|
| 2WD | 7.50-18 | Available | Available |
| 4WD | 14.9R24 | Available | Available |
You can switch to turf or industrial types by contacting your dealer. This helps you set up the tractor right for whatever work you plan to do.
Standard Rear Tire Size
The AGCO Allis 6680 uses 16.9R34 rear tires as the standard for both 2WD and 4WD models. These tires give you steady performance and a good balance between flotation and traction.
Most agricultural setups use this size because it works well for most types of field work. You might choose a different rear tire tread, such as turf or industrial, if you plan to use the tractor off the field or on paved surfaces.
Turf tires are gentler on grass and fine soil. Industrial treads, on the other hand, are more durable for hard surfaces or loader use.
Size adaptations should always follow manufacturer recommendations to avoid stability problems. Here’s a quick look:
| Model | Standard Rear Tire Size | Turf Options | Industrial Options |
|---|---|---|---|
| AGCO Allis 6680 | 16.9R34 | Available | Available |
Using the correct rear tire size is important for maintaining proper clearance, balance, and pulling power.
Optional Duals / Tracks / Flotation Kits
You have some choices if you want to boost traction, reduce soil compaction, or improve performance in muddy conditions. Dual rear wheels are a common option.
These add a second tire beside the original on each rear axle. Duals give you more grip and stability, especially when pulling heavy loads or working on soft ground.
Tracks and flotation kits are sometimes available for special fieldwork. Flotation kits use extra-wide tires to spread out the tractor’s weight, so you don’t dig into soft soils.
Tracks, while not as common as tires on this model, are an aftermarket option for some users. They can provide impressive traction and lower ground pressure but may require axle or frame changes.
Here’s a comparison:
| Option | Description | Pros | Cons |
|---|---|---|---|
| Dual Rear Wheels | Two wheels per rear axle | Better grip, more stability | Adds width, harder turning |
| Flotation Kits | Extra-wide tires, often with low pressure | Lower soil compaction | More expensive, less common |
| Tracks (Aftermarket) | Replaces tires with rubber tracks | Best in mud, very stable | High cost, complex to install |
These upgrades help you handle tough soil, slopes, or heavy implements, but you must make sure your tractor’s axle and frame can handle the extra load. Always check with your dealer to see which options fit your specific machine and needs.
Dimensions & Weight
The AGCO Allis 6680 tractor is designed with a practical balance of size and weight to fit the needs of fieldwork and farm transport. Specific measurements play a key role in how the tractor performs in tight spaces, on the road, and in various field conditions.
Wheelbase
The wheelbase is crucial for stability, comfort, and maneuverability. On the AGCO Allis 6680, the 2WD version comes with a wheelbase of 96.4 inches (244 cm), while the 4WD model has a slightly shorter wheelbase of 92.8 inches (235 cm).
A longer wheelbase on the 2WD model improves stability at higher speeds. The 4WD’s slightly reduced wheelbase offers better maneuverability for tasks that require sharper turning.
This difference helps you pick the model that best fits your field and working style. The wheelbase directly affects how smoothly the tractor rides over uneven ground.
It also impacts how much weight can be carried before losing balance. When working on sloped or rough fields, these details make a noticeable difference.
Overall Length
The total overall length of the AGCO Allis 6680 is 161 inches (408 cm). This measurement matters when storing the tractor or moving it through gates and barns.
The sizable length provides better balance for heavy implements attached to the rear. For transport, knowing the length helps you plan loading logistics and ensures the tractor fits on most trailers.
It also gives you an idea of how much room you’ll need in the shed or parking lot. This length strikes a reasonable balance for a tractor in its power category.
Overall Width (Minimum Tread)
The overall width with the minimum tread setting is about 82.4 inches (209 cm). This is measured across the outer edges of the tires.
The width plays a role in field performance, especially when navigating between crop rows. Wider tread settings add to stability when operating on slopes or hauling heavy loads.
The minimum width allows the tractor to pass through tighter paths and narrow gates, which is important in small-scale or diversified farms. Most users can adjust wheel spacing for row cropping, but knowing the minimum width lets you plan for tight work areas.
Be sure to measure your sheds and roadways to avoid getting stuck.
Height to ROPS / Cab
The height to the top of the ROPS (Rollover Protective Structure) or cab measures 111.2 inches (282 cm). This height is a critical number if you need to store or move the tractor indoors or transport it under low bridges and barn doors.
Tractors with a cab are typically a bit taller due to the structure and roof. If you have low structures on your farm, check this height before moving the tractor inside.
For hauling on a trailer, you also need this measurement to ensure clearance under bridges and wires. A higher cab increases your field of view, but it does mean you must watch out for low-hanging obstacles.
Ground Clearance
The ground clearance for the AGCO Allis 6680 falls within typical mid-sized tractor ranges, providing enough space to work over taller crops and uneven fields without snagging on stumps or debris.
Adequate ground clearance means you won’t frequently bottom out on ruts or clumps. It helps prevent crop and soil damage when working in muddy or uneven conditions.
If you plan to work in rough terrain, higher ground clearance makes a difference in reducing wear on the undercarriage and axles. You should check the exact clearance based on your specific wheel and tire setup, as different tires will slightly affect this number.
Shipping Weight
The shipping weight of the AGCO Allis 6680 is 6,724 pounds (3050 kg) for the 2WD version and 7,385 pounds (3350 kg) for the 4WD version. This is the weight of the tractor in a basic, dry state without fluids, operators, or attachments.
This weight affects what kind of trailer and towing vehicle you need to move the tractor. For most users, a standard heavy-duty flatbed will suffice.
Heavier machines are typically more stable in rough ground but may require larger equipment to move safely. The difference in weight between the 2WD and 4WD models means you need to check transport limits, especially for long hauls or when moving the machine between properties.
Operating Weight (With Fluids)
When you fill the tractor with all needed fluids, including oil, coolant, and a full fuel tank, the operating weight increases from the shipping weight. The operating weight is also sometimes called curb weight.
Fluid levels add several hundred pounds depending on the size of tanks and coolant systems. If you run the tractor with ballast, loaded tires, or extra attachments, the total weight increases further.
Knowing your operating weight is important for safe hauling and field performance. It impacts tire pressure settings, transport permits, and the risk of compaction in wet soils.
Always measure and record fully loaded weights before moving the tractor on public roads.
Dimensions & Weight Table
| Feature | 2WD Value | 4WD Value | Notes |
|---|---|---|---|
| Wheelbase | 96.4 in / 244 cm | 92.8 in / 235 cm | Longer on 2WD for stability |
| Overall Length | 161 in / 408 cm | 161 in / 408 cm | Same for both types |
| Overall Width (Min Tread) | 82.4 in / 209 cm | 82.4 in / 209 cm | May vary with tire settings |
| Height to ROPS / Cab | 111.2 in / 282 cm | 111.2 in / 282 cm | Important for storage and transport |
| Ground Clearance | Standard mid-range | Standard mid-range | Dependent on tires installed |
| Shipping Weight | 6,724 lbs / 3,050 kg | 7,385 lbs / 3,350 kg | Dry weight without fluids or attachments |
| Operating Weight (Fluids) | Add several hundred lbs | Add several hundred lbs | Includes all operational fluids (oil, fuel, etc.) |
Fuel & Fluids
The AGCO Allis 6680 tractor uses several types of fluids that you need to check and fill regularly. Each main system has a specific capacity and recommended type of fluid.
Fuel-Tank Capacity
The fuel tank of the AGCO Allis 6680 holds about 28.27 gallons (107.0 liters) of diesel. This capacity lets you run the tractor for long periods between fill-ups, which is important during busy farm tasks.
The tank is designed to handle the needs of a 79-horsepower engine working under heavy loads. Using clean, high-quality diesel fuel is important.
Make sure to check the fuel level before starting each day to avoid running out during work. Drain any water or sediment from the fuel system as recommended by the manufacturer.
A full tank should last many hours in typical field conditions. If you use the PTO heavily or carry out tasks at high engine speeds, you may need to refuel more often.
DEF-Tank Capacity (If Applicable)
The AGCO Allis 6680 does not use a DEF (Diesel Exhaust Fluid) system. DEF is only found on newer tractors with advanced emissions controls.
The 6680’s engine design predates the requirement for DEF, which makes refueling simpler. You do not need to maintain or fill a DEF tank on this tractor.
All emission controls are handled by the engine itself without needing extra fluids. Always check your specific tractor manual to confirm, but as of current information, DEF is not required.
Engine Oil Capacity
The engine oil capacity for the AGCO Allis 6680 is around 2.1 gallons (8 liters). Always check the manual for the exact figure, as it may vary slightly by model year.
Use only the oil type recommended by AGCO: usually a high-quality diesel engine oil meeting the required specifications. Change the oil regularly as scheduled, and always replace the oil filter at the same time.
Check the oil level before operation and add oil if needed. Running the engine with too little or old oil causes increased wear and possible engine damage.
Hydraulic/Transmission Oil Capacity
The hydraulic and transmission systems in the AGCO Allis 6680 share a combined oil system with a total capacity of about 15.2 gallons (57.5 liters). These oils provide power to the hydraulics, PTO, and transmission.
It is vital to keep the fluid at recommended levels. Check the oil regularly for the correct level and for contamination.
Only use oil that meets AGCO’s specifications for hydraulic and transmission systems. Replace the filter during oil changes, and follow the maintenance table provided in your owner’s manual.
A leak or low fluid can lead to hydraulic failure and may harm transmission and PTO components.
| Fluid/System | Capacity | Type/Notes | Maintenance Tips |
|---|---|---|---|
| Fuel Tank | 28.27 gal (107.0 L) | Diesel only | Use clean diesel; drain sediment as needed |
| DEF Tank | Not applicable | – | No DEF required for AGCO Allis 6680 |
| Engine Oil | ~2.1 gal (~8 L) | Diesel engine oil per specs | Change oil and filter on schedule |
| Hydraulic/Transmission | 15.2 gal (57.5 L) | AGCO spec hydraulic/transmission oil | Check/fill regularly; inspect for leaks |
Electrical System
The AGCO Allis 6680 tractor uses a 12-volt negative ground electrical setup. It includes an alternator-based charging system that delivers enough power for operation and accessories.
The battery and charging components are built to handle regular agricultural demands.
Ground Type (Negative / Positive)
Your AGCO Allis 6680 tractor uses a negative ground electrical system. This means the negative terminal of the battery is connected to the chassis, which serves as the common return path for electrical current.
A negative ground system is the standard for most modern tractors. It provides safer operation and reduces the risk of short circuits and electrical problems.
Many accessories and replacement parts are designed to work with negative ground setups, making it easier when repairs are needed. Always confirm the ground type before you install new electrical components.
Connecting parts designed for the wrong ground system could damage your equipment or create a safety hazard.
Alternator / Charging System
The tractor uses an alternator as its main charging component. The alternator keeps the battery charged while supplying power to lights, gauges, controls, and any electronic accessories.
Alternators are more efficient than older generators because they produce a steady voltage even at lower engine speeds. This reliability means you can run your headlights, work lights, or cab electronics without worrying about draining the battery too quickly.
On the AGCO Allis 6680, regular checks on alternator belts and wiring help avoid issues. If the alternator fails, your warning lights may come on or systems may not work as expected.
Charging Output (Amps)
The charging output for the AGCO Allis 6680 alternator is rated at 55 amps. This rating means the alternator can provide up to 55 amperes of current at maximum output, which covers all basic and moderate extra electrical needs of the tractor.
A consistent charging output keeps the battery fully powered while operating lights, PTO switches, and safety devices. If extra accessories are added, like work lamps or GPS units, the alternator still delivers enough current without overwhelming the battery.
If your tractor starts to show dimming lights or slow cranking, it may indicate a problem with output.
Battery Voltage
Your tractor operates with a 12-volt battery system. This standard voltage supports starting the engine and running all factory-installed electrical components.
A 12-volt battery allows easy connections with modern farm equipment, jumper cables, and chargers. It also means that most replacement batteries and electrical parts are widely available.
If the battery drops significantly below 12 volts, it could mean a charging issue, dead cell, or corroded connections.
Battery CCA Rating
The Cold Cranking Amps (CCA) rating refers to the battery’s ability to start the engine in low temperatures. For the AGCO Allis 6680, you should use a battery with a CCA rating matched to its diesel engine and climate needs, generally around 700-900 CCA.
A higher CCA helps in colder areas, giving enough power to turn the engine over when oil thickens due to the cold. If you work in a warm climate, a moderate CCA is usually enough, but having a higher rating provides extra reliability.
When choosing a new battery, always match or surpass the minimum recommended CCA rating. This prevents slow cranking or starting failures, especially during winter.
| Topic | AGCO Allis 6680 Specification | Details |
|---|---|---|
| Ground Type | Negative | Chassis grounded; safer, standardized system |
| Alternator/Charging System | Alternator | Maintains charge, runs accessories |
| Charging Output (Amps) | 55 amps | Supports standard and extra electrical loads |
| Battery Voltage | 12 volts | Standard voltage for modern tractors |
| Battery CCA Rating | 700-900 CCA (recommended) | Reliable cold starts; match local climate needs |
Total Cost of Ownership Metrics
Understanding the cost of owning an AGCO Allis 6680 tractor helps you plan for long-term use. Expenses include regular maintenance, fuel, how the tractor loses value over time, and the price for parts.
| Metric | Details |
|---|---|
| Recommended Service Intervals | Oil change every 150 hrs, air/fuel filters every 300 hrs, coolant yearly |
| Estimated Annual Maintenance Cost | $1,200–$1,800 annually, including parts and labor |
| Depreciation Curve (% Per Year) | 6–10% value loss yearly; higher in early years |
| Fuel Consumption @ Rated Load (L hr⁻¹) | 10–12 liters per hour of operation |
Recommended Service Intervals
You need to follow the maintenance schedule closely to keep the AGCO Allis 6680 running well. Oil changes are needed every 150 operating hours.
Air and fuel filters should be changed about every 300 hours. Check the coolant level and change it once per year to avoid overheating.
The hydraulic system filter is changed every 500 hours. Grease all moving joints and pivot points at least once a month during active use.
Belt and hose inspections should happen each season. Replace them if they show wear.
Tire pressure checks should be done monthly. If you use the tractor in harsh conditions, perform checks more often.
Estimated Annual Maintenance Cost
You can expect to spend between $1,200 and $1,800 each year for maintenance on the AGCO Allis 6680. This range covers oil, filters, coolant, grease, and common wear items like belts or hoses.
Labor costs depend on your area but make up a big part of the yearly expense if you use a dealership. If you do your own work, costs are lower, but you may need special tools or manuals.
Parts like hydraulic filters and batteries can add to yearly costs if they need replacing. Occasional repairs, such as replacing a water pump or clutch, can raise the total for that year.
Depreciation Curve (% Per Year)
Right after purchase, your AGCO Allis 6680 will lose about 10% of its value each year for the first five years. After that, the decrease slows to about 6–8% per year, depending on use and condition.
Well-kept tractors with all service records hold value better. High hours or poor maintenance can speed up depreciation.
Rare models or those with extra features such as air conditioning or special tires can keep their value better. Market conditions and demand in your area also matter.
Fuel Consumption @ Rated Load (L hr⁻¹)
At rated load, the AGCO Allis 6680 uses about 10–12 liters of diesel per hour. This number can change based on the job, operator habits, and soil or field conditions.
Lower loads or lighter work reduce fuel use. Keeping filters and injectors clean improves fuel efficiency.
Monitor your fuel system and fix leaks quickly to avoid waste. Using the tractor just below its maximum power often saves some fuel without losing performance.