AGCO 8425 Tractor 425 hp Specifications and Key Features
AGCO 8425 Tractor 425 Hp
The AGCO 8425 tractor is known for its high horsepower and reliable engineering. It stands out for its distinctive design, manufacturing history, and strong field performance.
Production & Identification
The AGCO 8425 tractor is part of the AGCOSTAR line. These tractors were made during the mid-to-late 1990s.
Each unit has a robust frame and articulated body. The prominent cab design offers good visibility.
The AGCO 8425 has a rated engine power of 425 horsepower. This makes it suitable for large-scale farming operations.
AGCO branded these tractors as heavy-duty workhorses. The 8425 was aimed at farmers needing consistent power in wide fields.
Key identifiers include its size, rear dual wheels, and AGCO badging. The specification plate confirms the exact model and year.
Manufacturer / Brand
The AGCO 8425 was designed and marketed by AGCO, a major agricultural equipment manufacturer. AGCO acquired the AGCOSTAR line by purchasing McConnell Tractors in the 1990s.
McConnell originally developed these tractors before AGCO rebranded them. AGCO stands for Allis-Gleaner Corporation, known for merging several major tractor brands.
AGCO provides a wide distribution, service, and parts support network. The 8425 reflects AGCO’s focus on reliability and rugged performance.
The tractor’s legacy also connects to Massey Ferguson, another AGCO-owned brand. Some engineering expertise and components are shared between these brands.
Model Number / Series
The model number 8425 reflects the tractor’s place in the AGCOSTAR lineup and its 425 hp rating. The “8” series indicates a high-horsepower range within AGCO’s offerings.
The AGCOSTAR series included several models, but the 8425 is among the largest. The model number is usually listed on the hood and in technical documents.
Series numbers help you compare specs among tractors. They also show the performance tier you are considering.
Factory Of Manufacture
The AGCO 8425 was manufactured in Coldwater, Ohio. This plant was originally used by McConnell Tractors.
Coldwater specialized in building large, articulated tractors for tough conditions. The location had experience with custom and OEM tractor manufacturing.
These tractors were tailored for North American farming needs. Broad fields and challenging soil types were considered in their design.
The Coldwater plant’s reputation for assembling reliable machines adds value. This helps with the tractor’s long-term serviceability.
Years Produced
The AGCO 8425 was produced from about 1995 through 1998. During these years, AGCO met the demand for high horsepower tractors.
Limited production numbers make this tractor somewhat rare. Production dates help determine the tractor’s age and expected wear.
Knowing these years helps with sourcing compatible parts. It also helps with understanding market availability.
If you find a used AGCO 8425, it will likely have a production year stamped on its plate or documentation.
Original List Price (Launch Year)
When released, the AGCO 8425 carried a premium price. Its powerful engine and advanced features made it more expensive than smaller tractors.
The original list price in the mid-1990s often reached well into six figures in USD. Pricing reflected its high-spec components and intended use on large farms.
Today, the list price helps you compare value versus modern models. It also helps understand depreciation rates over time.
Serial-Number Location
To locate the serial number, look for a metal plate or decal on the tractor’s frame. It is usually on the left side, near or behind the front left wheel or cab step.
The serial number is important for identifying parts and confirming the model. It also helps check service records.
Having this number ensures you get correct technical support or order exact-fit components. It can help track ownership and verify authenticity.
Always check this location when inspecting a used model.
| Topic | Details |
|---|---|
| Production & Identification | Produced mid-1990s; 425 hp; part of AGCOSTAR line; robust, articulated body; AGCO branding |
| Manufacturer / Brand | AGCO (Allis-Gleaner Corporation); based on McConnell Tractors’ designs; links to Massey Ferguson |
| Model Number / Series | 8425; part of AGCOSTAR series; high-horsepower tier; model number on hood and documents |
| Factory Of Manufacture | Coldwater, Ohio; originally McConnell plant; known for large tractors; tailored for US markets |
| Years Produced | 1995-1998; limited production; production year shown on tractor plate |
| Original List Price | Six-figure USD price at launch; premium due to size, engine (Cummins 425 hp), features |
| Serial-Number Location | Metal plate/decal on left side of frame; near front wheel or cab step; key for identification |
Engine Specifications
The AGCO 8425 tractor uses a 14.0-liter Cummins diesel engine. This engine delivers strong performance and reliable power.
It features turbocharging, an inline-6 design, and advanced cooling and fuel systems.
Engine Make & Model
The AGCO 8425 uses a Cummins N14 diesel engine. This engine is known for its durability and high output.
The N14 is an inline 6-cylinder engine with turbocharging and direct injection. It has been widely used in agriculture and trucking.
The Cummins engine offers a worldwide support network. Its reliability makes it a top choice for a high-horsepower tractor like the 8425.
Fuel Type & Emissions Tier
The AGCO 8425 uses diesel fuel only. The Cummins N14 was built for diesel and does not have a gasoline or alternative-fuel variant.
It features a turbocharged system, improving power and efficiency. The engine predates modern Tier 4 standards and meets earlier EPA requirements.
Ultra-low sulfur diesel is recommended for best performance and fewer emissions. The direct injection system provides quick starts and strong torque at low rpm.
Cylinders / Displacement
This tractor features a 6-cylinder, inline engine. Each cylinder is arranged in a single row for a compact and balanced design.
The displacement is 14.0 liters, or 855 cubic inches. This large size helps produce consistent high power and torque.
A bore and stroke of 5.5 inches by 6.0 inches gives a “square” engine profile. This design supports good power across a wide rpm range.
Rated Horsepower (Gross & Net)
The Cummins N14 engine in the AGCO 8425 is rated for 425 gross horsepower (hp), or 316.9 kW. It was one of the highest horsepower tractors of its time.
For drawbar (net) power, it delivers about 347 horsepower (258.5 kW). The difference accounts for power losses in the drivetrain.
Rated engine speed is around 2100 rpm. The engine maintains these output levels thanks to its size and efficient fuel delivery.
Peak Torque (Nm @ Rpm)
Peak torque for the Cummins N14 engine is about 2,000 Nm, or 1,500 lb-ft. This torque is available at lower engine speeds, near 1,300–1,400 rpm.
High torque at low rpm is important for pulling heavy loads. Turbocharging helps provide better torque response as demand rises.
This combination means stable pulling power, even in changing field conditions.
Compression Ratio
The compression ratio for the Cummins N14 engine is about 16:1. This is standard for heavy-duty turbocharged diesel engines.
A higher compression ratio improves fuel efficiency and torque at low engine speeds. Using proper diesel fuel and regular maintenance is important for engine health.
High compression supports smooth starts in cold weather. A coolant heater or block heater helps with winter starts.
Cooling System & Capacity
A liquid-cooled system keeps the Cummins N14 engine at the right temperature. Coolant moves through the engine block and radiator to remove heat.
The cooling system is designed for a high-capacity engine. Coolant capacity is about 13–15 gallons (49–57 liters), but check your manual for the exact figure.
A belt-driven water pump keeps coolant flowing. The large radiator core supports peak output over long days.
Many AGCO 8425 units have a coolant heater for cold starts. Air cleaners keep dust out of the engine, helping it last longer.
Engine Specification Table
| Feature | Specification / Value |
|---|---|
| Engine Make & Model | Cummins N14, Inline 6-cylinder, Turbocharged, Direct Injection |
| Fuel Type & Emissions Tier | Diesel; Pre-Tier 3 (Standard EPA for era, no aftertreatment) |
| Cylinders / Displacement | 6 Cylinders, 14.0 L (855 cu in) |
| Bore x Stroke | 5.5 in x 6.0 in (140 mm x 152 mm) |
| Rated Horsepower (Gross/Net) | 425 hp (317 kW) Gross; 347 hp (259 kW) Drawbar (Net) |
| Rated RPM | 2100 rpm |
| Peak Torque | ~2,000 Nm (1,500 lb-ft) @ 1,300–1,400 rpm |
| Compression Ratio | 16:1 |
| Cooling System & Capacity | Liquid-cooled; 13–15 gal (49–57 L) |
| Air Cleaner | Dry or Centrifugal (depending on configuration) |
| Coolant Heater | Optional for cold climate starting |
Power Take-Off (PTO)
The AGCO 8425 tractor is built for high-power fieldwork. Reliable PTO performance is important for handling heavy-duty jobs.
Claimed PTO Horsepower
The AGCO 8425 features a powerful PTO system. It is rated at about 425 engine horsepower, but PTO horsepower delivered to implements is slightly less.
For most large tractors in this class, PTO horsepower is around 360 to 380 HP. This allows you to run demanding equipment like large grain carts, heavy-duty mowers, and big balers.
High PTO horsepower means the tractor can maintain speed under load. The PTO system is designed for consistent, continuous use in the field.
PTO Type (Independent / Live / Economy)
The AGCO 8425 uses an independent PTO. You can engage or disengage the PTO without stopping the tractor or pressing the clutch.
This feature makes operating large implements more efficient. It also gives you better control in the field.
Independent PTO drives are generally safer and easier to use than live PTO systems. With independent PTO, you can stop or reverse the tractor while the equipment keeps running.
This is important for tasks like unloading or spreading material. The AGCO 8425 does not have an economy (lower RPM) PTO.
The focus is on delivering maximum, reliable power at the standard PTO speed. This is essential for high-performance, large-scale implements.
You don’t have to shift or slow down your working pace to get the best PTO output.
PTO Speeds (540 / 1 000 Rpm)
The AGCO 8425 comes with a 1,000 RPM PTO shaft. This is designed for heavy-duty farm equipment that needs fast, steady power.
There is no 540 RPM PTO option. This tractor is built for large-scale use where high PTO speed is needed.
A 1,000 RPM PTO provides smoother operation and more efficient power transfer for bigger implements. It helps minimize vibration and wear, even during long hours.
Connecting a matching 1,000 RPM implement ensures optimal performance and less stress on the PTO system. This is helpful if you use several types of high-horsepower equipment during the season.
| Feature | AGCO 8425 PTO Details |
|---|---|
| Engine Horsepower | 425 HP |
| Claimed PTO HP | ~360–380 HP |
| PTO Type | Independent |
| Economy PTO | Not available |
| PTO Engagement | Switch or control lever (no need for clutch) |
| Available PTO Speeds | 1,000 RPM only |
| Ideal Implements | Large mowers, balers, grain carts, big augers, etc. |
| Best Use | High-capacity, continuous, heavy-duty fieldwork |
Transmission & Drivetrain
The AGCO 8425 tractor features a heavy-duty transmission built for high-horsepower fieldwork. You get strong drivetrain components and a four-wheel drive system for traction and performance under tough conditions.
Transmission Type (Syncro, Powershift, CVT, HST)
The AGCO 8425 uses an Eaton Fuller transmission that is partially synchronized. Some gears can be shifted while moving, but others require you to stop or match speeds.
This design is made for durability and high torque loads. You do not have powershift, CVT, or hydrostatic (HST) options on the AGCO 8425.
The partially synchronized system is reliable for demanding jobs. It is best for farm work rather than tasks that need frequent gear changes under load.
Number Of Gears / Ranges
You have 18 forward gears and 2 reverse gears. This range gives you many speed options for fieldwork, transport, and slow-speed tasks.
The high number of gears helps you control speed and boost fuel efficiency and productivity. The 18-speed setup is especially useful for heavy loads or large implements.
Switching gears lets you match engine power to soil conditions. This helps prevent the tractor from getting stuck or losing traction on soft ground.
Top Transport Speed
The top transport speed for the AGCO 8425 is about 25 mph (40 km/h), depending on tires and local rules. This speed is enough for farm-to-field moves or road transport.
The transmission and drivetrain are built for steady travel at these speeds without overheating or extra wear. Always check local road laws for speed limits and equipment rules.
Drive (2WD / 4WD / AWD)
The AGCO 8425 is a four-wheel drive (4WD) tractor. All four wheels get power from the engine, not just the rear axle.
Four-wheel drive improves traction and reduces wheel spin, especially in wet or soft fields. With 4WD, you can work in poor field conditions and pull bigger implements without getting stuck.
Four-wheel drive lets you use the full engine power for big jobs like tillage, plowing, or grain cart work. The AGCO 8425 uses large axles and hubs to handle its 425 horsepower.
Differential-Lock & Final Drives
A differential-lock is included for maximum traction in slippery conditions. Locking the differential makes both wheels on the same axle turn together, giving you more grip if one wheel spins.
This is valuable in heavy mud or on hills. The final drives on the AGCO 8425 are built for the stress of 425 horsepower and towing large implements.
Heavy-duty planetary final drives are common in this tractor class. They provide the strength and durability needed for tough work year after year.
Major Transmission & Drivetrain Specifications
| Feature | AGCO 8425 Details |
|---|---|
| Transmission Type | Partially synchronized (Eaton Fuller) |
| Number of Gears | 18 forward, 2 reverse |
| Top Transport Speed | Up to 25 mph (40 km/h) |
| Drive | Four-wheel drive (4WD) |
| Differential-Lock | Yes |
| Final Drives | Heavy-duty planetary |
Steering & Brakes
Safe handling and stopping power are important for large tractors like the AGCO 8425. Reliable steering and brakes help keep this 425 hp machine safe and easy to control, even with heavy loads.
Steering System (Hydrostatic / Power-Assisted / Mechanical)
The AGCO 8425 uses a hydrostatic power steering system. Steering effort is greatly reduced, so you do not have to fight the wheel in tough field conditions.
Hydraulic fluid provides smooth and steady control at all speeds. Hydrostatic power steering is especially helpful when using heavy implements or working on rough ground.
You can make sharp turns or small corrections easily from inside the cab. The combination of articulated steering and hydrostatic assist reduces driver fatigue, even during long days.
This design also makes slow-speed maneuvering easier. There is little kickback through the steering wheel, and you get a predictable response in most situations.
Turning Radius (With Brakes)
The AGCO 8425 features articulated steering, so the front and rear sections of the tractor pivot. This gives you a sharper turning radius than a rigid-frame tractor.
Using the brakes while turning tightens the radius even more. This is helpful in tight field corners or when lining up implements.
For a large tractor, the AGCO 8425 is nimble for its size. Turning with independent braking gives you more flexibility and maneuverability during work.
Service Brakes (Wet Disc, Dry Drum, Etc.)
The AGCO 8425 uses hydraulic dry disc service brakes. These brakes use friction discs to stop the tractor.
Hydraulic operation means brake pressure is even and easy to control. Maintenance for dry discs is simple, but you should check them regularly for safety.
These brakes are made to handle heavy loads, like large implements or grain carts. Reliable service brakes reduce stopping distance and add peace of mind, especially during road transport.
Parking Brake Type
The parking brake on the AGCO 8425 is mechanical. When you set it, it locks the wheels and holds the tractor in place, even on slopes.
A mechanical parking brake is simple and reliable. You engage it by hand, and it stays set until you release it.
Regular checks of the parking brake cable and parts are important. Keeping this system in good shape keeps you safe and makes sure the AGCO 8425 stays parked during work or maintenance.
| Feature | Type/Detail | How It Helps the Operator |
|---|---|---|
| Steering System | Hydrostatic, articulated | Smooth, easy control, reduced effort |
| Turning Radius (with brakes) | Tight (articulation + brake assist) | Maneuverable in tight spaces |
| Service Brakes | Hydraulic dry disc | Reliable stopping, easy to maintain |
| Parking Brake | Mechanical | Simple, holds tractor securely when parked |
Cab & Operator Station
The AGCO 8425 has a spacious cab for comfort during long workdays. Controls are easy to reach, and visibility is clear for safe operation.
ROPS / Cab Option
You get a standard cab with Roll-Over Protective Structure (ROPS) on the AGCO 8425. This keeps you protected in case of an accident.
The cab is fully enclosed, keeping out dust and chemicals. Wide doors and steps make it easier to get in and out.
Safety glass is used for windows and doors, giving you clear views and durability. The ROPS is built into the cab frame, so you do not lose headspace or comfort.
If you work in rough conditions, the cab’s solid frame and ROPS help keep you safe.
Climate Control (A/C, Heater, Filter)
Inside the cab, air conditioning and heating are standard. This helps you stay comfortable in hot summers and cold mornings.
The climate control system keeps the cabin at a steady temperature. Air is filtered to block pollen and dust, making it easier to breathe.
Vents are placed to spread air evenly. You can adjust the temperature and fan speed easily, even while driving.
The system is built for reliability, so it keeps working even in harsh weather.
Seat & Suspension
The operator seat in the 8425 is adjustable and has a suspension system. You can set the seat height and distance to fit your body.
The suspension absorbs shocks from bumpy fields. Armrests and lumbar support are standard, reducing strain on your back and legs.
Swivel and tilt adjustments make it easier to turn and check implements behind the tractor. Sometimes a passenger seat is included, which is useful for training or working with others.
The seat fabric is tough and handles dirt or moisture from work gear.
Noise Level (dB A @ Operator Ear)
Noise inside the cab is between 75 and 80 dB(A) at the operator’s ear during normal work. This is quiet enough for normal conversation, but hearing protection is a good idea for long shifts.
The cab uses insulation and seals to reduce noise from the engine and hydraulics. Rubber mounts and weather seals lower sounds and vibrations from the frame.
Lower noise levels help prevent fatigue and hearing loss. Clear communication inside the cab makes your workday less stressful.
| Feature | Specification/Detail | Benefit |
|---|---|---|
| ROPS / Cab | Enclosed cab with ROPS, safety glass, wide access | Safety, protection from elements, easy entry/exit |
| Climate Control | Standard A/C, heater, filtered air, adjustable vents | Comfort in all seasons, reduces dust/pollen exposure |
| Seat & Suspension | Adjustable, suspension, lumbar support, armrests | Reduces fatigue, customizes fit, absorbs shocks from terrain |
| Noise Level (dB A) | 75-80 dB(A), insulated cab, noise-dampening features | Lower fatigue, safer communication, better hearing protection |
Hydraulics
The AGCO 8425 tractor uses a closed-center hydraulic system with strong flow rates and reliable pressure. You can expect high performance for demanding tasks and support for a range of implements.
System Type (Open-Center / Closed-Center / PFC)
The hydraulic system on the AGCO 8425 is a closed-center design. Oil flow stops when it’s not needed, which keeps pressure steady and reduces wasted energy.
This system gives you better control and makes it easier to handle bigger loads or sensitive implements. Closed-center hydraulics also improve smooth operation and consistent performance, especially when using multiple hydraulic tools at once.
There is no Power Beyond Function (PFC) on this model. However, the system supports most heavy-duty attachments.
Implement Pump Flow (L Min⁻¹)
The main hydraulic pump on the AGCO 8425 provides a high flow rate to the implement circuits. This ensures your attachments run efficiently and keeps you productive in the field.
You can expect a pump flow of around 113 liters per minute (about 30 gallons per minute). This output suits large implements like air seeders, planters, and tillage tools.
You get steady operation and smooth reactions, even with demanding equipment.
Steering Pump Flow (If Separate)
The AGCO 8425 features hydrostatic power steering. It uses the main hydraulic circuit for steering assistance.
There is no completely separate pump for steering. The system diverts enough oil to the steering unit as needed, so steering remains smooth and easy even under load or in tight turns.
Total Combined Flow
The total hydraulic flow on the AGCO 8425 covers both implements and steering. With a main pump flow of about 113 L/min, the system supports multi-function use.
When you use more than one hydraulic function at the same time, the closed-center system keeps implements and steering responsive.
System Pressure (Bar / Psi)
The maximum system pressure for the AGCO 8425’s hydraulics is about 2500 psi (approximately 172 bar). This pressure lets you run high-demand implements and ensures consistent lifting and operation.
Strong system pressure reduces the chance of hydraulics stalling under load. It also improves lifting ability and matches modern attachments that need steady force.
Remote Valves (Number & Type)
The AGCO 8425 typically comes with up to 4 remote hydraulic valves (or SCVs—selective control valves). These double-acting valves give you control over a range of hydraulic functions.
You can operate different tools, such as planters, seeders, or hydraulic motors, all from the cab controls. The design lets you adjust settings depending on your implement’s needs for flexible and precise operation.
Table: AGCO 8425 Tractor Hydraulic System
| Feature | Details |
|---|---|
| System Type | Closed-Center |
| Implement Pump Flow | ~113 L/min (30 GPM) |
| Steering Pump Flow | Uses main hydraulic circuit, not separate |
| Total Combined Flow | ~113 L/min (includes steering/implements) |
| System Pressure | 2500 psi (172 bar) |
| Remote Valves | Up to 4, double-acting |
| Valve Function | Single and double-acting implement control |
Three-Point Hitch (3PH)
The AGCO 8425 is equipped with a robust three-point hitch. This system lets you attach many heavy-duty implements and manage large loads for a range of field tasks.
| Feature | Specification/Detail |
|---|---|
| Hitch Category | Category 3 |
| Lift Capacity @ Ball Ends | Approximately 15,000+ lbs (varies by setup) |
| Draft / Position Control | Both Available |
| Top-Link Sensing | Yes |
Hitch Category (1 / 1N / 2 / 3)
The AGCO 8425 features a Category 3 three-point hitch. Category 3 hitches have larger pins and wider spacing compared to Category 1 or 2, allowing them to handle more weight and accept larger implements.
This type of hitch matches the tractor’s high horsepower and weight, letting you run heavy, commercial-sized equipment. It is not interchangeable with smaller categories without adapters.
Verify that your implements are compatible with Category 3 to avoid damage or fit problems. Category 3 hitches are common on tractors above 100 hp and support heavy cultivating, planting, and tillage tasks.
Lift Capacity @ Ball Ends
The AGCO 8425 offers a lift capacity at the ball ends of roughly 15,000 pounds or more. This allows you to raise large, fully-loaded implements such as wide disc harrows, planters, or heavy plows.
Lift capacity can vary depending on setup or supplemental hydraulics. Check your operator’s manual for the exact rating on your machine.
If you work with heavy tools, the high lift rating lets you operate with fewer restrictions. This helps ensure efficient operation and less wear on hitch components.
Draft / Position Control
Both draft and position control are available on the AGCO 8425’s hitch system. Position control lets you set the implement height for tasks that require consistent depth, like seeding or spraying.
Draft control automatically adjusts the hitch height as soil conditions change. This keeps your tool at a steady working depth and prevents overload in tough soil.
Having both controls lets you adapt the tractor for a wide range of tasks. You get better efficiency and consistency with large implements.
Top-Link Sensing (Yes/No)
Top-link sensing is present on the AGCO 8425. This feature measures forces through the upper link of the hitch during work.
When the implement encounters resistance, the system can adjust the lift automatically to maintain steady working depth. Top-link sensing is especially useful with large plows or cultivators and improves traction while reducing wheel slip.
By using top-link sensing, you get better field results and help protect both the tractor and attached tools. This feature is standard on most high-power row crop tractors like the 8425.
Axles & Load Limits
Managing axle loads and drive types is essential for safe operation. Pay attention to specific figures for both front and rear axle loads and the type of final drive to make informed decisions about fieldwork and transportation.
Maximum Front-Axle Load (Kg)
The AGCO 8425 is built for heavy work and strong field performance. The front axle must support substantial weight from the tractor’s structure, the engine, and any front-mounted attachments.
Typical front-axle load capacity for a large tractor in this class is between 7,000 and 10,000 kg. This allows you to handle heavy implements without risking axle failure.
Using front duals or wider tires can help distribute weight and maintain safe load limits. Always check your tire ratings and follow manufacturer recommendations.
Overloading the front axle can cause premature wear or steering issues.
Maximum Rear-Axle Load (Kg)
The rear axle on the AGCO 8425 handles most of the machine’s operational stress. This includes carrying the bulk of mounted equipment, providing main traction, and holding counterweights.
Typical maximum rear-axle loads for tractors in this range are between 10,000 and 13,000 kg. This ensures you can safely use larger implements or tow heavy trailers without excessive strain.
Consider load transfers when going up hills or during stops. Always distribute weight as evenly as possible and stay within manufacturer guidelines.
Final-Drive Type
The AGCO 8425 uses robust final-drive systems designed for high-horsepower demands. The final drive transfers engine torque to the wheels for reliable field traction and durability.
This tractor uses heavy-duty planetary final drives, a common choice for large four-wheel-drive machines. Planetary gears provide high load capacity and distribute forces evenly, reducing wear under heavy loads.
Inspect final-drive oil levels regularly and perform maintenance as recommended. Always use the correct lubricants and follow service intervals in your manual.
| Axle/Drive Part | Typical Load/Type | Importance | Maintenance Tip |
|---|---|---|---|
| Front Axle | 7,000–10,000 kg | Handles engine and front implements | Check tire pressure regularly |
| Rear Axle | 10,000–13,000 kg | Supports equipment and main traction | Inspect for even tire wear |
| Final Drive | Heavy-duty planetary gear system | Provides torque distribution and durability | Replace oil at recommended times |
Tires & Track Options
The AGCO 8425 Tractor focuses on traction and stability with its tire and track options. These choices help you handle different field conditions and meet specific farming needs.
Standard Front Tire Size (Ag / Turf / Industrial)
The AGCO 8425 often comes with large agricultural tires for heavy fieldwork. The standard front tire size is 20.8R42.
These radial tires are suited for pulling large implements and carrying heavy weight. Turf or industrial options are not usually standard for the 8425, as its main use is row crop and broadacre farming.
The deep tread on ag tires helps you move through thick soil and mud. The size marking “20.8R42” means 20.8 inches wide, radial construction, and 42-inch rim diameter.
This combination provides strong grip and good load-carrying ability.
Standard Rear Tire Size
The standard rear tires are also 20.8R42. Having the same size for both front and rear makes it easier to rotate tires and maintain balance with large equipment.
Dual configurations are possible when you need extra grip. The aggressive tread pattern gives steady traction even on soft or uneven ground.
For most uses, the 20.8R42 setup meets typical farming needs. Using the same size front and rear also simplifies replacement and parts inventory.
Optional Duals / Tracks / Flotation Kits
You can upgrade your AGCO 8425 with dual rear tires, adding extra wheels for better traction and stability in tough conditions. Duals help reduce soil compaction and improve performance with wider implements.
Flotation kits use wider tires to lower ground pressure and minimize crop damage in soft or wet soils. These are practical if you often work in delicate or newly planted areas.
Factory track options are not usually standard on the 8425, but after-market track kits are available. Tracks provide better traction and less ground pressure than wide flotation tires, though they can increase costs and require special installation.
| Feature | Standard Front | Standard Rear | Optional Upgrades |
|---|---|---|---|
| Tire Size | 20.8R42 | 20.8R42 | Duals, Flotation Kits, After-market Tracks |
| Tire Type | Agricultural Radial | Agricultural Radial | Flotation (wide), Track kits |
| Main Use | Traction & Stability | Heavy Load Carrying | Reduced Compaction, Traction in Wet Fields |
| Upgrade Purpose | — | — | Handles tough, soft, or sensitive soils |
| Tread Type | Deep Ag Tread | Deep Ag Tread | Flotation/Track specialized patterns |
Dimensions & Weight
The AGCO 8425 tractor is a large, heavy-duty machine designed for demanding agricultural tasks. Its size and weight reflect its ability to handle tough jobs and rugged conditions.
Wheelbase
The wheelbase of the AGCO 8425 is 137.1 inches (348 cm). This long distance between the front and rear wheels provides stability and better traction.
A longer wheelbase supports heavy loads and pulling tasks. It also improves ride comfort and helps distribute the tractor’s weight more evenly.
Having a solid wheelbase helps prevent tipping and improves performance during field work.
Overall Length
The overall length of the AGCO 8425 is about 23 feet. This measurement shows how much room the tractor will need for storage or transport.
A longer tractor body offers added stability by spreading the weight over a larger area. When planning to use or park this tractor, consider the length for equipment sheds and trailers.
The size also affects how you navigate tight spaces around the farm, so make sure you have enough maneuvering room.
Overall Width (Minimum Tread)
The overall width at the minimum tread is about 13 feet. This measurement is important for several reasons.
It tells you how much space is needed when operating between rows or moving equipment. Wide tractors may require special permits or escorts on public roads.
In the field, the width improves stability, especially on uneven terrain or slopes. Always check your building access and field entry points to avoid clearance issues.
Height To ROPS / Cab
The height to ROPS (Roll-Over Protective Structure) or cab is around 11 feet for the AGCO 8425. This tall profile is typical for high-powered, four-wheel-drive tractors.
Knowing the total height is important for passing under door frames, utility lines, and overhangs. The high cab gives you better visibility, but it also raises the center of gravity.
When working near low structures, always measure openings before driving the tractor through them.
Ground Clearance
Ground clearance is the space between the lowest part of the tractor and the ground. The AGCO 8425 has significant clearance, which helps avoid obstacles like rocks, roots, and crop stubble.
Ample ground clearance lets you work in rough fields or muddy spots with less risk of getting stuck or damaging parts. This is important for tasks like plowing and cultivating.
Shipping Weight
The shipping weight of the AGCO 8425 is about 28,300 pounds (12,836 kg). This is the weight of the tractor as delivered from the factory, without fuel, fluids, or extra implements.
Knowing the shipping weight helps you plan for safe trailering and meets road regulations. Heavy tractors like this need strong trailers and may require permits for road travel.
Operating Weight (With Fluids)
The operating weight includes all necessary fluids—fuel, oil, coolant, and sometimes the operator. For the AGCO 8425, this weight can approach or exceed 30,000 pounds, depending on fuel, ballast, and attachments.
Operating weight matters for field traction, tire pressure, and soil compaction. Always check the operating weight to set up proper tires, ballasting, and hitching.
| Specification | Measurement | Notes |
|---|---|---|
| Wheelbase | 137.1 in (348 cm) | Enhances stability and ride comfort |
| Overall Length | ~23 ft | Important for storage and maneuvering |
| Overall Width (Min Tread) | ~13 ft | Key for transport, in-field stability, and building access |
| Height to ROPS/Cab | ~11 ft | Affects clearance under structures and visibility |
| Ground Clearance | High | Helps avoid field obstacles and improves off-road performance |
| Shipping Weight | 28,300 lbs (12,836 kg) | Factory weight without fluids or equipment |
| Operating Weight | ~30,000 lbs+ | With fluids, driver, ballast, and implements |
Fuel & Fluids
Knowing the details about fuel and fluid systems is important for keeping your AGCO 8425 running well. Proper care and knowledge of these capacities helps prevent breakdowns and makes maintenance easier.
Fuel-Tank Capacity
The AGCO 8425 tractor comes with a large fuel tank built for heavy-duty work.
You can expect a fuel capacity of 230 gallons (about 870 liters).
This large tank allows for long periods of operation between refills. The tank supports both the Cummins and Detroit Diesel engine options.
Always use the correct grade of diesel fuel, as stated in your owner’s manual.
Table 1: Fuel-Tank Capacity
| Tank Type | Capacity | Units |
|---|---|---|
| Fuel | 230 | Gallons (870 L) |
DEF-Tank Capacity (If Applicable)
The AGCO 8425 was built before DEF (Diesel Exhaust Fluid) systems became standard in agricultural equipment. This tractor does not use DEF.
There is no DEF tank to fill, monitor, or maintain on this tractor.
Table 2: DEF-Tank Capacity
| DEF System Present? | DEF Tank Capacity | Notes |
|---|---|---|
| No | Not Applicable | No DEF used on this model |
Engine Oil Capacity
Engine oil is vital for engine performance and longevity. The AGCO 8425 has a 6-cylinder turbocharged diesel engine (either Cummins or Detroit Diesel).
Engine oil capacity is typically around 42 quarts (10.5 gallons or about 40 liters). When changing the oil, use the viscosity and specification listed in your tractor’s manual.
Always check the oil level after filling. Replace the oil filter with each oil change.
Table 3: Engine Oil Capacity
| Engine Type | Oil Capacity | Units | Recommended Oil Type |
|---|---|---|---|
| Cummins/Detroit | 42 | Quarts | Check manual for specifications |
Hydraulic/Transmission Oil Capacity
The hydraulic and transmission systems are important for powering attachments and smooth gear shifts. The AGCO 8425 uses a shared hydraulic/transmission oil reservoir.
Total hydraulic and transmission oil capacity is about 65 gallons (approx. 246 liters). Use only high-quality oil, as recommended by AGCO.
Regularly check fluid level and condition. Replace filters on schedule, and watch for leaks around hoses or connections.
Table 4: Hydraulic/Transmission Oil Capacity
| System | Capacity | Units | Notes |
|---|---|---|---|
| Hydraulic/Transmission | 65 | Gallons | Shared system, check often |
All Fuel & Fluid Capacities for AGCO 8425
| Component | Capacity | Unit | Notes |
|---|---|---|---|
| Fuel Tank | 230 | Gallons | Diesel fuel only |
| DEF Tank | Not applicable | – | No DEF system on this tractor |
| Engine Oil | 42 | Quarts | Always use recommended grade |
| Hydraulic/Transmission Oil | 65 | Gallons | Use AGCO-approved hydraulic oil |
Electrical System
The AGCO 8425 tractor uses a robust electrical setup designed for reliable performance. Key parts include a negative ground system, a high-output alternator, and strong batteries.
| Component | Specification | Details |
|---|---|---|
| Ground Type | Negative | Standard for modern tractors |
| Alternator | 130 amps alternator | Efficient charging system |
| Charging Output | 130 amps | High output to support large batteries |
| Battery Voltage | 12 volts (x3 batteries) | Connected to deliver reliable power |
| Battery CCA Rating | 600 CCA per battery | Provides cold start capability |
| Starter Volts | 12 volts | Matches battery system |
Ground Type (Negative / Positive)
The AGCO 8425 tractor operates with a negative ground electrical system. This is typical for modern agricultural equipment.
A negative ground means the chassis or frame is directly connected to the battery’s negative terminal. This setup allows easier compatibility with most electrical accessories.
It also makes troubleshooting and maintenance more straightforward. A negative ground system improves safety, especially when connecting and disconnecting the battery.
Alternator / Charging System
The alternator on the AGCO 8425 delivers a strong, steady output. It is designed to keep up with the electrical demands of a 425 hp tractor.
This system uses an alternator rated at 130 amps. The high output ensures continuous power for lights, monitoring systems, and control panels.
The alternator’s design helps keep voltage levels within safe limits. If you add new attachments, there is usually enough extra charging power.
Charging Output (Amps)
The charging system’s output is important for a machine this powerful. The AGCO 8425 charges at 130 amps, which is higher than smaller tractors.
With 130 amps, the tractor can run multiple electrical components at the same time. Strong charging output also means the batteries are recharged quickly after use.
High charging capacity supports reliable starting, especially in cold conditions.
Battery Voltage
This tractor uses a 12-volt electrical system and is equipped with three heavy-duty batteries. Together, they provide enough power for starting the engine and running accessories.
The three 12-volt batteries are often connected in parallel to maintain voltage while increasing available current. This setup supports both starting and running loads.
A 12-volt system allows you to use standard replacement parts and battery chargers.
Battery CCA Rating
Each battery in the AGCO 8425 is rated at 600 cold cranking amps (CCA). CCA tells you how much power the battery delivers at low temperatures.
With 600 CCA per battery, the system delivers strong cranking power during cold weather starts. If you need to replace the batteries, use new ones with the same or better CCA rating.
Total Cost Of Ownership Metrics
The AGCO 8425 tractor’s total cost includes regular service, yearly upkeep, value drop, and fuel use. Understanding these points helps you plan your budget.
| Metric | Details | Key Considerations |
|---|---|---|
| Service Intervals | Every 250–500 hours for most components | Oil changes, filters, and major inspections |
| Annual Maintenance Cost | $4,000–$7,000 per year | OEM vs aftermarket parts, labor rates, attachments |
| Depreciation Curve | 7–13% value loss per year (first 5 years higher) | Usage hours, condition, resale market demand |
| Fuel Consumption @ Rated Load | 60–70 liters per hour (L/hr) | Duty cycle, field conditions, attachments, engine performance |
Recommended Service Intervals
Plan regular service for the AGCO 8425 every 250 to 500 engine hours. This includes changing engine oil, hydraulic fluid, and transmission fluid at about 250-hour intervals, and replacing fuel and air filters.
Major systems such as cooling and electrical should be inspected every 500 hours. For tractors using attachments, check and service these parts due to extra wear.
OEM (original equipment manufacturer) parts last longer but cost more, while aftermarket parts offer lower up-front costs. Always keep step kits, ram mounts, and generators inspected for safety.
Estimated Annual Maintenance Cost
The typical yearly maintenance expense for the AGCO 8425 ranges from $4,000 to $7,000. Costs depend on whether you use OEM or aftermarket parts and the number of hours the machine is used.
Routine service items include engine oil, hydraulic fluid, transmission oil, and filters. Larger repairs, like servicing generators or replacing belts, can increase costs.
Labor rates in your area and the condition of high-wear attachments also affect overall costs. If you use complex technology, expect extra yearly costs for calibrations and part replacements.
Depreciation Curve (% Per Year)
The depreciation of an AGCO 8425 tractor is usually about 7–13% per year over the first five years. The largest value drop happens in the first two to three years.
Intense use or high engine hours can cause the tractor to lose value faster. Tractors with more attachments, like straw choppers or step kits, tend to hold value better if these items are well-maintained.
Using many aftermarket parts may slightly lower resale value compared to tractors with mostly OEM parts. The used farm equipment market also affects depreciation.
Higher demand for midsize high-power tractors helps them retain value. Keeping maintenance records and ensuring all parts work properly can help slow down depreciation.
Fuel Consumption @ Rated Load (L Hr⁻¹)
At full power, the AGCO 8425’s 14.0 L, 6-cylinder Cummins diesel engine uses about 60 to 70 liters per hour. Actual fuel use changes based on the job.
Heavy tillage equipment or running a large generator will keep the tractor near its maximum fuel rate. Using ag sprayers or straw choppers at lower power settings can drop consumption below 60 L/hr.
Light fieldwork uses less fuel. Adding mud hog 4WD kits or running heavy flex draper belts increases load and raises fuel needs.
Proper maintenance, like changing air filters and using clean fuel, helps keep fuel efficiency high. Checking tire pressure and inspecting attachments for smooth function can also help avoid unnecessary fuel waste.