The AGCO AGCOSTAR 8425 is a powerful farm tractor known for its reliability and performance. Built in Coldwater, Ohio, USA, this 4WD tractor was produced from 1991 to 2001. It features a strong engine, offering either a Cummins N14 (14.0 L) or Detroit Diesel (12.7 L) option, making it suitable for heavy-duty farming tasks.
The AGCO AGCOSTAR 8425 comes with a selective gear fixed-ratio transmission, providing 18 forward and 2 reverse gears. This design allows it to handle various farming conditions efficiently. Farmers appreciate its durability, which is apparent from its long production run and continued demand in the used tractor market.
Origins of the AGCO Brand
AGCO Corporation was established in 1990. Its history, though, stretches back much further, with roots in earlier agricultural machinery companies. The initials “AGCO” stand for “Allis-Gleaner Corporation,” showing the company’s connection to Allis-Chalmers, a prominent agricultural equipment manufacturer.
In 1994, AGCO acquired McConnell, a move that led to the creation of the 8425 tractor. This powerful tractor, with its 425 HP engine, quickly became a staple in the farming industry.
Built in Coldwater, Ohio, USA, the AGCO AGCOSTAR 8425 featured Four-Wheel Drive. The tractor’s 4×4 Articulated 4WD design allowed for greater maneuverability and strength on rough terrain.
This specific model was also available in a range of colors including silver, orange, and red, catering to White, Allis, and Massey customers. The AGCO AGCOSTAR 8425 was based on the McConnell 1000, showing the influence of McConnell’s legacy.
For more details, check out the company’s journey on the History of AGCO page.
History of the AGCOSTAR 8425 Model
The AGCOSTAR 8425, a 425 HP tractor, was produced by AGCO in Coldwater, Ohio, USA. This model was built from 1995 to 2001. It was on the market just after AGCO acquired McConnell in 1994, utilizing the base design of the McConnell 1000.
This model is known for its 4×4 articulated 4WD chassis, ensuring superior maneuverability and strength on the field. The AGCOSTAR 8425 was available in three colors: silver, orange, and red, catering to White, Allis-Chalmers, and Massey Ferguson customers.
The tractor came equipped with either a Cummins N14 (14.0 L) engine or a Detroit Diesel engine (12.7 L). Both engines provided robust power and reliability, essential for demanding farming operations.
Notably, the AGCOSTAR 8425 used a selective gear fixed-ratio transmission with 18 forward and 2 reverse gears. This type of transmission allowed precise control over the tractor’s movements, which is crucial for various farming tasks.
AGCO built this model in response to the market’s need for powerful, reliable tractors with four-wheel drive capabilities. It remains a significant part of agricultural machinery history.
Below are some quick facts:
- Manufacturer: AGCO
- Production Years: 1995-2001
- Engine Options: Cummins N14, Detroit Diesel
- Transmission: Selective gear fixed-ratio with 18 forward and 2 reverse gears
- Chassis: 4×4 Articulated 4WD
- Colors: Silver, Orange, Red
The combination of powerful engines, a reliable transmission, and a robust chassis made the AGCOSTAR 8425 a popular tractor during its production run.
Technical Specifications
The AGCO AGCOSTAR 8425 is equipped with a Cummins N14 or Detroit Diesel engine. These are six-cylinder, liquid-cooled, turbocharged diesel engines. The Cummins N14 has a displacement of 14.0 liters (855 cubic inches), while the Detroit Diesel offers 12.7 liters (774 cubic inches).
The tractor features an Eaton Fuller transmission system. It provides 18 forward and 2 reverse gears. This allows for a wide range of speeds suitable for various farm tasks.
Here are the detailed engine specifications:
- Engine Type: Turbocharged, Liquid-Cooled Diesel
- Displacement: Cummins N14 – 855 cu in; Detroit Diesel – 774 cu in
- Bore/Stroke: Cummins N14 – 140 mm (5.51 in)
- Rated RPM: 425 hp
For the hydraulic system, the AGCOSTAR 8425 uses a closed-center hydraulic system. This ensures efficient handling of equipment.
Important hydraulic details include:
- Pump Flow: 33 gallons per minute
- Valves: 4
- SCV Flow: Not specified
The tractor’s dimensions contribute to its robust design:
- Wheelbase: 142 inches
- Weight: 30,000 lbs
Here are additional specifications related to the electrical system:
- Battery: 12 volts
- Starter Volts: 12 volts
- Battery CCA: Not specified
- Alternator: 140 amps
The AGCO AGCOSTAR 8425 is built for heavy-duty work, making it suitable for large-scale farms. It combines power and efficiency, ensuring excellent performance and reliability.
Engine Details
The AGCO AGCOSTAR 8425 is equipped with a choice of two diesel engines: Cummins and Detroit Diesel.
- Cummins N14:
- Type: Turbocharged aftercooled diesel
- Cylinders: 6
- Displacement: 14.0 L (855 cubic inches)
- Bore/Stroke: 5.50 x 6.00 inches (140 x 152 mm)
- Power: 425 hp (316.9 kW)
- Fuel System: Direct injection
- Air Cleaner: Dual paper elements with aspirator
- Pre-Heating: Coolant heater
- Compression Ratio: 16.5:1
- Rated RPM: 2100
- Torque: 1500 lb-ft (2034 Nm)
- Torque RPM: 1400
- Starter Volts: 12
- Detroit Diesel Series 60:
- Type: Turbocharged diesel
- Cylinders: 6
- Displacement: 12.7 L (774 cubic inches)
- Power: 425 hp (316.9 kW)
- Fuel System: Direct injection
- Pre-Heating: Coolant heater
- Rated RPM: 2100
- Torque: 1500 lb-ft (2034 Nm)
- Torque RPM: 1200
The Cummins N14 engine is known for its robust performance and higher displacement compared to the Detroit Diesel Series 60. Both engines offer substantial horsepower and torque, making the AGCOSTAR 8425 a powerful and reliable tractor for demanding tasks.
Production years for the AGCOSTAR 8425 spanned from 1995 to 1998 for the Detroit Diesel engine, with subsequent models featuring only the Cummins engine.
Key Specifications at a Glance:
| AGCO 8425 Engine Type | Cummins N14 | Detroit Diesel |
| Engine Type | Turbocharged | Turbocharged |
| Cylinders and Valves | 6 cyl / 24 valves | 6 cyl |
| Displacement | 14.0L (855 ci) | 12.7L (774 ci) |
| Bore/Stroke | 5.50 x 6.0 in (140 x 152 mm) | N/A |
| Power | 425 hp | 425 hp |
| Fuel System | Direct Injection | Direct Injection |
| Air Cleaner | Dual Paper Elements with Aspirator | N/A |
| Pre-Heating | Coolant Heater | Coolant Heater |
| Compression Ratio | 16.5:1 | N/A |
| Rated RPM | 2100 RPM | 2100 RPM |
| Torque | 1500 lb-ft | 1500 lb-ft |
| Torque RPM | 1400 RPM | 1200 RPM |
| Starter Volts | 12V | N/A |
Transmission Details
The AGCO AGCOSTAR 8425 features an Eaton Fuller transmission. This transmission is known for its reliability and performance in agricultural operations.
The transmission type is partially synchronized, making it easier for the operator to shift gears.
Transmission Specifications:
| Brand | Type | Gears | Clutch |
| Eaton Fuller | Partially synchronized | 18 forward, 2 reverse | 393.7mm cerametallic disc |
This transmission setup allows the AGCOSTAR 8425 to handle a variety of tasks effectively, providing flexibility and efficiency in the field.
Gears and Speeds:
The AGCOSTAR 8425 supports 18 forward speeds and 2 reverse speeds, covering a wide range of operational needs. Here’s a simplified overview of the gear speeds in both miles per hour and kilometers per hour:
Shift Pattern:
The transmission’s shift pattern is designed to be straightforward, reducing driver fatigue and increasing operational efficiency.
The partially synchronized Eaton Fuller transmission in the AGCOSTAR 8425 is a key feature that helps this tractor meet the demanding needs of modern farming.
Power and Tractor Test Details
The AGCO AGCOSTAR 8425 tractor is equipped with a powerful Cummins N14 diesel engine. It operates with 425 hp (316.9 kW) engine power. This makes the AGCOSTAR 8425 suitable for heavy-duty tasks.
A notable test of the AGCO AGCOSTAR 8425 took place from October 1 to 22, 1996, recorded as the OCED Tractor Test 1721.
The performance test showed that this tractor has impressive capabilities. The maximum power achieved during the test was 346.61 hp (258.5 kW). The fuel usage was noted to be 22.1 gallons per hour (83.6 liters per hour).
| Test Detail | Measurement |
| Max Power | 346.61 hp (258.5 kW) |
| Fuel Usage | 22.1 gal/hour (83.6 l/hour) |
| Gear Used for Power Test | 5L |
| Max Pull | 35,497 lbs (16,101 kg) |
| Gear Used for Pull Test | 2H |
The gear 5L was used during the power test, and the gear 2H was used for the pull test. The tractor demonstrated a maximum pull capacity of 35,497 pounds (16,101 kg).
These detailed performance metrics highlight the AGCO AGCOSTAR 8425’s ability to handle demanding agricultural tasks effectively.
Mechanical Details
The AGCO AGCOSTAR 8425 is a sturdy four-wheel drive (4WD) tractor designed for demanding farm work. Built by AGCO between 1995 and 2001, it features articulated power steering and outboard planetary final drives.
Mechanical Features:
- Chassis Type: Four-wheel drive
- Steering Type: Articulated power
- Brakes Type: Hydraulic dry disc
- Cab Type: Standard with air conditioning
Hydraulic System:
| Type | Pressure (psi/bar) | Valves | Pump Flow (gpm/lpm) | SCV Flow (gpm/lpm) |
| Closed center | 2500 / 172.4 | 4 or 5 | 35 / 132.5 | 27 / 102.2 |
Electrical Info:
| Ground Type | Charging System | Charging Amps | Batteries | Battery CCA | Battery Volts |
| Negative | Alternator | 130 | 3 | 600 (Detroit) | 12 |
| 700 (Cummins) |
The tractor is available with either the Cummins N14 or Detroit Diesel engine, both turbocharged and offering robust performance.
Dimensions:
- Wheelbase: 137.1 inches (348 cm)
- Weight: 28,300 lbs (12,836 kg)
- Tires: Front and rear – 20.8R42
Dimensions
The AGCO AGCOSTAR 8425 features notable dimensions that contribute to its solid presence and performance on the field.
Overall Dimensions
| Feature | Measurement (inches) | Measurement (cm) |
| Wheelbase | 137.1 | 348 |
| Length | 272.4 | 691 |
| Width | 152.9* | 388 |
| Ground Clearance | 20.5 | 52 |
| Drawbar Clearance | 23 | 58 |
*Width over duals
Weight
| Weight Type | Measurement (lbs) | Measurement (kg) |
| Shipping Weight | 28300 | 12836 |
| Ballasted Weight | 40375 | 18314 |
| Max Capacity Weight | 42500 | 19278 |
The weight measurements show the tractor can handle substantial loads while providing stability.
Height
| Height Feature | Measurement (inches) | Measurement (cm) |
| Hood Height | 94.6 | 240 |
| Cab Height | 133.2 | 338 |
| Exhaust Height | 138.9 | 352 |
These height features make the AGCO AGCOSTAR 8425 a formidable machine with a strong field presence.
Variants and Models
The AGCO AGCOSTAR 8425 was available with various specifications to meet different needs.
Paint Colors:
- Silver
- Orange
- Red
The different colors were aimed at White, Allis, and Massey customers. These colors allowed buyers to choose a tractor that matched their brand preference.
Engine Options
- Cummins N14: 14.0 L displacement, 855 cubic inches, six-cylinder, turbocharged diesel.
- Detroit Diesel: 12.7 L displacement, 774 cubic inches, six-cylinder, turbocharged diesel.
These engines provided strong power necessary for demanding farming tasks.
Transmission:
- Selective gear fixed-ratio transmission with 18 forward and 2 reverse gears.
This transmission type allowed for smoother shifting and better control in various farming conditions.
Model Years:
- Manufacturing Period: 1995 to 2001.
- Built in Coldwater, Ohio.
Related Models:
- AGCO 8360: Similar to the AGCOSTAR 8425 but with less horsepower.
The AGCOSTAR 8425 is based on the McConnell 1000 model, which AGCO acquired in 1994.
Applications:
- Heavy-duty work on large-scale farms.
- Suitable for various farm tasks due to its robust build and powerful engine options.
These variants and models make the AGCOSTAR 8425 a versatile and reliable choice for large farm operations.
AGCO 8425 Reviews
The AGCO 8425 tractor, launched by AGCO and inspired by the McConnell 1000 series, offers both performance and reliability. This model is appreciated for its diverse color options and robust engine types.
Owner Reviews
Owners of the AGCO 8425 often highlight its impressive power and versatility. With the availability of a Cummins N14 (14.0 L) or Detroit Diesel (12.7 L) engine, the tractor ensures efficient and smooth performance.
Users also appreciate the tractor’s durability, frequently commenting on how it has maintained its integrity over years of use. Hydraulics performance, with 27 to 35 gpm PFC, is another point of satisfaction, particularly noted with the N14 pump design.
Common Issues and Troubleshooting
Despite its strong reputation, the AGCO 8425 is not without issues. One recurring problem is axle seal leaks, often due to debris like twine wrapping around the axle. Owners have to be diligent in maintaining the seals to prevent leaks.
The Detroit Diesel models sometimes require the use of a “double” pulley on the crank for the pump, an adaptation found necessary for smooth operation. Additionally, some users have reported the need for regular maintenance on the hydraulic systems, especially the PFC hydraulics.
Another minor problem cited is with the transmission, as the tractor offers 18 forward and 2 reverse gears, which might need occasional adjustments. Despite these issues, the tractor’s overall reliability seems unaffected, as most problems are easily fixable.
Frequently Asked Questions
The AGCO AGCOSTAR 8425 is known for its reliable performance and ease of maintenance. People often inquire about its availability, average performance based on reviews, and potential issues.
Where can I find an AGCOSTAR 8425 available for sale?
The AGCOSTAR 8425 is typically available through various online marketplaces and auction sites. These include platforms like NewAgTalk, where users sometimes list used agricultural equipment.
How does the AGCOSTAR 8425 perform based on user reviews?
Owners report that the AGCOSTAR 8425 is a robust tractor suitable for heavy-duty work. With engines like the Cummins N14 or Detroit Diesel options, reviews highlight its reliable performance and ease of maintenance over extended hours of operation.
What common problems do owners report with the AGCOSTAR 8425?
Common issues include axle seal problems due to foreign objects like twine and occasional concerns with hydraulic systems. For example, some users mentioned issues resolved by minor repairs, such as replacing seals or addressing hydraulic pump concerns.
What is the approximate price range for an AGCOSTAR 8425?
The price range for a used AGCOSTAR 8425 can vary based on its condition, hours of use, and location, but prices seem to range between $40,000 and $50,000 for a used AGCOSTAR 8425. For example, we found a 2024 listing for an AGCO 8425 with 5,665 hours for $45,000, and a 2019 listing for an AGCO 8425 with a Cummins N14 with 2,038 hours for $48,500.