AGCO ST41A Tractor 40 hp: Key Features, Specs, and Performance Overview
Production & Identification
The AGCO ST41A tractor was made as part of a series for compact utility purposes. This section covers who made it, its model details, where it was built, when it was produced, price at launch, and how to find its serial number.
| Topic | Details |
|---|---|
| Manufacturer / Brand | AGCO (distributed), Iseki (manufacturer) |
| Model Number / Series | ST41A, part of the ST-A Series |
| Factory of Manufacture | Iseki factory in Matsuyama, Japan |
| Years Produced | 2005 – 2008 |
| Original List Price | Varies by market (specific figures not widely reported) |
| Serial-Number Location | Typically on main frame or next to the engine, left-hand side |
Manufacturer / Brand
You can identify the AGCO ST41A as a product of two main companies. The AGCO brand is known for distributing this tractor, but the actual manufacturing was done by Iseki.
Iseki is a Japanese company recognized for its experience in compact and utility tractor production. AGCO began offering the ST41A to extend its lineup in North America and other regions.
In some cases, models closely related to the ST41A were also sold under Massey Ferguson branding, due to the partnership and shared technology between these brands.
Model Number / Series
The model number for your reference is ST41A. It’s part of AGCO’s ST-A Series, which included several models designed for compact utility tasks.
The series also included slightly smaller and larger tractors, but the ST41A sits near the top in terms of power at 40 horsepower. The same base tractor, especially the platform and engine, was shared in other brands within the AGCO group, including Massey Ferguson.
Always look for the exact model number “ST41A” on the plates or in owner documents to distinguish it from the ST40 or ST47A, which are related but have different engine output or features.
Factory of Manufacture
The AGCO ST41A was produced by Iseki at their main tractor factory located in Matsuyama, Japan. Iseki has been making tractors at this location for decades, with a focus on quality, compact design, and modern features.
This factory is known for tightly controlled build standards, modern assembly lines, and high-quality components. Your ST41A, if original, will show Japanese manufacture in the documentation or on its identification plates.
Sometimes, export models for North America may have additional stickers or plates applied by AGCO after shipment. This connection to a specific factory can help with obtaining parts or verifying authenticity when comparing to similar models.
Years Produced
You can find the AGCO ST41A tractors produced between 2005 and 2008. The model replaced previous versions like the ST40 and had some overlap with newer ST-A series updates.
Production for this particular model ran for a fairly short span but it was widely available in both the United States and some other regions through AGCO’s dealership network. When identifying a tractor, remember that slight changes may have occurred during the run.
These might include small design or component changes which can affect part compatibility. Knowing the year of production is important for maintenance, repairs, and verifying originality.
Original List Price (Launch Year)
The original retail price for the AGCO ST41A was not widely advertised, but it varied by country, dealership, and additional equipment or tire options. At launch, the price typically matched other compact utility tractors in the 40-horsepower range.
If you are searching for historical prices, old dealership brochures or trade publications from 2005–2008 may provide more specific figures. Modern used values depend on condition and included implements.
Serial-Number Location
You can find the serial number for the AGCO ST41A usually stamped on a metal frame plate. The most common location is near the front left side of the tractor’s main frame, often close to where the engine mounts.
In some cases, you might see the number on the transmission case or a reinforced section beside the engine bay. Always clean the area carefully if the plate is dirty or faded, as the numbers can wear off with use.
Recording the serial number is important for warranty registration, ordering parts, and confirming which year or factory revision your tractor belongs to. Make sure the serial on the plate matches paperwork to avoid registration or resale issues.
Engine Specifications
The AGCO ST41A has a turbocharged diesel engine with good power for its size. Main features include a three-cylinder design, fuel efficiency, and a modern cooling system that ensures reliable operation.
| Specification | Details |
|---|---|
| Engine Make & Model | Iseki Turbo Diesel 3-cylinder |
| Fuel Type & Emissions Tier | Diesel, Emissions Tier compliance varies by region |
| Cylinders / Displacement | 3 Cylinders / 1.5L (91.4-91.5 cu in.) |
| Rated Horsepower (Gross & Net) | 40.1 hp (Gross), 29.5-31 hp (PTO, depending on transmission) |
| Peak Torque (Nm @ rpm) | Not always specified, typical for class |
| Compression Ratio | Approx. 18:1 (typical for this type, confirm for your engine) |
| Cooling System & Capacity | Liquid cooled, radiator system, moderate fluid capacity |
Engine Make & Model
The AGCO ST41A uses an Iseki turbocharged diesel engine. Iseki is a respected Japanese manufacturer known for building compact, reliable diesel engines for tractors and other equipment.
This 3-cylinder powerplant offers good fuel economy and solid performance for medium-sized utility tasks. The turbocharger improves efficiency and helps deliver better low-end torque, which is helpful for work that requires steady pulling power.
The engine’s design is compact, making it suitable for the ST41A’s frame, but it’s still capable of providing steady output. Knowing the make and model is important when you need parts or service, as you’ll look for Iseki-compatible components.
Fuel Type & Emissions Tier
You will use diesel fuel for the AGCO ST41A. Diesel engines generally provide more torque and better fuel efficiency for tractors used in tough, continuous field operations.
Emissions standards can vary with the model year and market. Most ST41A tractors will comply with at least Tier 2 or Tier 3 emission regulations, depending on when and where the tractor was sold.
This means the engine uses some emissions controls to reduce pollutants. It is important to use clean, high-quality diesel to maintain performance and prevent problems in the fuel system.
The emissions compliance is usually noted on a label near the engine or in the product manual.
Cylinders / Displacement
This tractor engine has three cylinders arranged in a line configuration. Three-cylinder engines are a common choice for compact and utility tractors because they balance power and efficiency, and they are easier to maintain due to fewer moving parts.
The engine displacement is around 1.5 liters (91.4 to 91.5 cubic inches). Displacement is the total volume inside the cylinders when they are swept by the pistons.
A 1.5L displacement for a turbocharged diesel in this horsepower range is typical, giving you good fuel use and enough engine size to handle jobs around the farm, yard, or worksite.
Rated Horsepower (Gross & Net)
The gross engine horsepower for the AGCO ST41A is 40.1 hp at 2,600 rpm. Gross horsepower is the engine’s output before losses from attachments or systems like the alternator.
For the power take-off (PTO), the engine produces either 29.5 hp (hydrostatic transmission) or 31 hp (gear transmission). This PTO rating is important because it shows the power available to run implements like mowers, tillers, or sprayers.
You should match your implements to these PTO ratings to get the right performance and avoid overloading the tractor during heavy tasks.
Peak Torque (Nm @ rpm)
Peak torque information for the AGCO ST41A’s engine is generally not provided in manufacturer specs. For similar 40 hp, turbocharged 3-cylinder diesels, you can typically expect peak torque in the range of 110–130 Nm (newton-meters) at an engine speed of about 1,600 to 1,800 rpm.
Torque is important because it affects the tractor’s ability to pull loads and power through tough conditions without stalling. You will notice strong low- to mid-range torque, making it easier to use heavy implements at lower speeds.
If you need the exact torque rating, check your engine’s data plate or technical manual, as values can differ slightly by year or market.
Compression Ratio
The compression ratio for diesel engines in this range is usually around 18:1. This means the volume inside the cylinder when the piston is at the bottom is 18 times more than when it’s at the top.
A high compression ratio is typical for diesels. It raises the air temperature enough for the diesel fuel to ignite without spark plugs and helps the engine run more efficiently.
If you are doing engine work or adjustments, verify the exact compression ratio in your service manual or with your dealer, as slight changes may exist between models and years.
Cooling System & Capacity
The AGCO ST41A uses a liquid cooling system. This system includes a radiator, water pump, and coolant passages to help keep the engine at a safe working temperature.
Liquid cooling prevents overheating during long work periods and ensures steady power output. The system requires periodic checks of fluid levels and the condition of hoses and the radiator.
Fluid capacity is typically several liters—for most compact tractors around 5–7 liters (1.3–1.8 gallons). Always consult your owner’s manual for the exact capacity and maintenance intervals.
Coolant choice and maintenance are important for keeping your engine in good shape and reducing the chance of major repairs.
Power Take-Off (PTO)
The AGCO ST41A tractor is equipped with a PTO system designed to handle a variety of implements. It offers useful features for attaching and powering tools like mowers, tillers, and balers.
Claimed PTO Horsepower
The AGCO ST41A’s PTO delivers about 40.1 hp (29.9 kW) at maximum rated power. This output allows you to run most mid-sized implements with steady, reliable power.
A higher PTO horsepower means you can use equipment that puts more demand on the tractor. The ST41A’s PTO rating supports a wide range of attachments, such as rotary cutters and small balers.
It’s important to match your implements to this horsepower rating to avoid overworking the engine or PTO. The listed PTO horsepower is measured at the PTO shaft rather than the engine, giving a more accurate idea of the power available for attachments.
Table 1: Claimed PTO Horsepower
| Tractor Model | PTO Horsepower (hp) | PTO Horsepower (kW) |
|---|---|---|
| AGCO ST41A | 40.1 | 29.9 |
PTO Type (Independent / Live / Economy)
This tractor uses an independent PTO system. With independent PTO, you can engage or disengage the PTO without stopping the tractor or using the clutch.
This design is convenient when you need to stop the implement but keep the tractor moving, such as when turning at row ends. Independent PTO gives you better control over your implements.
You can run the PTO-driven equipment as needed while changing speeds or shifting gears. For operators, this can lead to safer and more efficient work, especially in tasks that require frequent starts and stops.
Live or economy PTO types are not standard on the ST41A, but independent PTO is widely regarded as the most user-friendly setup for jobs with diverse equipment.
Table 2: PTO Type Features
| Feature | Independent PTO (AGCO ST41A) | Live PTO | Economy PTO |
|---|---|---|---|
| Engage w/o stopping | Yes | No | Varies |
| Uses clutch | No | Varies | Varies |
| Ideal for | Frequent stops/starts | Simpler uses | Fuel-saving |
PTO Speeds (540 / 1 000 rpm)
The AGCO ST41A offers a 540 rpm rear PTO as standard. This is the most common PTO speed for compact and utility tractors, making it easy to find compatible implements.
Some tractors have a 1,000 rpm PTO or dual speeds, but the ST41A features just the 540 rpm rear PTO, which suits the majority of attachments used on farms or acreage. The PTO is controlled independently from the tractor’s movement.
A mid PTO is listed as optional. If installed, this is mainly for mid-mount mowers or front sweepers and typically operates at a different speed.
For most applications, the rear 540 rpm PTO will handle everything from rotary tillers to sprayers.
Table 3: PTO Speeds
| PTO Position | Speed (rpm) | Standard/Optional |
|---|---|---|
| Rear | 540 | Standard |
| Mid | Varies | Optional |
Transmission & Drivetrain
The AGCO ST41A offers solid versatility in its drivetrain, supporting a range of tasks from fieldwork to transport. With several transmission choices, reliable drive systems, and practical speed options, you can choose a setup that matches your working needs.
Transmission Type (Syncro, Powershift, CVT, HST)
The AGCO ST41A comes with multiple transmission options. You can select either an 8-speed synchro shuttle, a 12-speed power shuttle, or a hydrostatic transmission (HST).
The 8-speed synchro shuttle uses a manual gear shift with synchronized gears, making it easier to change directions and speeds while on the move. The 12-speed power shuttle provides clutchless direction changes, which are especially helpful during loader work or applications that require frequent forward and reverse switching.
The hydrostatic (HST) transmission is designed for those who need smooth, variable speed control, mainly for tasks like mowing or light utility work.
Number of Gears / Ranges
Gear options vary based on the transmission you select. With the 8-speed synchro shuttle, you get four gears in each of two ranges (high and low), making a total of eight forward and eight reverse speeds.
The 12-speed power shuttle expands this with more gears for closer speed matching and smoother operation, which helps during jobs requiring frequent shifts. If you choose the hydrostatic transmission, you get infinite speed selection within three main ranges—low, medium, and high.
This means you can adjust travel speed precisely without shifting gears or stopping. This flexibility is ideal for operators who value precise speed or need to frequently change pace during tasks such as mowing or landscaping.
Top Transport Speed
On the AGCO ST41A, the top transport speed typically ranges from 15 to 18 miles per hour (24 to 29 kilometers per hour), depending on which transmission is installed. This lets you efficiently move between work sites or travel on roads where necessary.
The hydrostatic model usually has a slightly lower top speed due to its design but offers more flexibility at low speeds. The synchronized and power shuttle models focus on balancing both road and work speeds.
When moving attachments or towing, you should adjust your speed accordingly for safe handling.
Drive (2WD / 4WD / AWD)
The AGCO ST41A is available with mechanical four-wheel drive (MFWD), often simply referred to as 4WD. This drive system ensures better traction and power delivery, especially in rough or slippery field conditions.
Standard models emphasize 4WD capability, which is important for loader work, working on slopes, or operating in muddy or uneven terrain. The system can be engaged or disengaged as needed, combining fuel efficiency during light work with additional traction when conditions demand.
A two-wheel-drive (2WD) version is less common, but it is sometimes offered for operators working mostly on flat, firm surfaces.
Differential-Lock & Final Drives
The AGCO ST41A includes a differential-lock feature for better traction. You can activate the differential lock when one wheel begins to slip, which helps ensure both rear wheels turn at the same speed.
Final drives transfer power from the transmission to the wheels. The ST41A uses durable, reliable final drive systems designed for demanding agricultural or loader work.
This setup helps prevent drivetrain damage under heavy loads or when traction is inconsistent. Using the differential-lock in tough conditions helps protect the axle components and provides better performance through challenging ground.
| Subtopic | Options / Details | Functionality & Relevance |
|---|---|---|
| Transmission Type | 8-speed synchro shuttle, 12-speed power shuttle, HST | Offers choices between manual, semi-automatic, and variable speed setups |
| Number of Gears / Ranges | 8F/8R (Syncro), 12F/12R (Power Shuttle), HST (3 range) | Balances speed selection for various tasks |
| Top Transport Speed | 15–18 mph (24–29 km/h) | Allows efficient between-site travel; lower with HST |
| Drive (2WD / 4WD / AWD) | Standard: 4WD (MFWD), Optional: 2WD | 4WD for traction in rough terrain; 2WD for flat ground |
| Differential-Lock & Final Drives | Differential lock; reliable final drives | Increases traction in loose/muddy soil; protects drivetrain under heavy loads |
Steering & Brakes
The AGCO ST41A tractor is designed with a strong focus on easy handling and safe operation. Key systems include hydrostatic power steering and reliable braking setups to make driving and controlling the machine straightforward and secure.
| Feature | Description |
|---|---|
| Steering System | Hydrostatic power steering |
| Turning Radius (with brakes) | Tight, suitable for small fields and narrow paths |
| Service Brakes | Wet disc brakes for consistent stopping power |
| Parking Brake Type | Mechanical, locks rear wheels for secure parking |
Steering System (Hydrostatic / Power-Assisted / Mechanical)
The steering on the ST41A uses a hydrostatic power steering system. This setup gives you smoother wheel control, especially when operating with heavy loads or attachments.
It reduces steering effort, making the tractor easy to turn even at slow speeds. Hydrostatic steering means you do not have to fight against the weight of the tractor or loader.
You can steer with less force, which cuts down on operator fatigue during long work days. This system is important if you are working in tight spaces or doing chores like loader work that require a lot of steering corrections.
You will notice that the steering remains consistent whether the tractor is moving slowly, turning sharply, or working in muddy conditions. Power assistance also helps prevent steering kickback from rough terrain, keeping your hands steady on the wheel.
Turning Radius (with brakes)
The AGCO ST41A features a compact turning radius. By using the brakes together with the steering, you can turn tighter, which helps in confined barn lots or between crop rows.
The steering and brake system are designed to work together, allowing for sharper turns without loss of control. When applying the individual wheel brakes during a turn, the inside rear wheel slows down.
This makes the tractor pivot more closely to a point. You can easily maneuver around obstacles and into small work areas, even with a 4WD design.
Knowing your actual turning radius is essential if you work in areas with limited space. The AGCO ST41A’s steering and braking coordination enables efficient navigation, saving you time on repetitive fieldwork and yard tasks.
Service Brakes (Wet Disc, Dry Drum, etc.)
The service brakes on the ST41A use a wet disc design. Wet disc brakes are located inside the axle housing and run in oil.
This type of brake stays cool and lasts longer, even with frequent stopping or operation in muddy and wet conditions. Wet disc brakes give you more consistent stopping power.
They are less likely to fade or lose effectiveness on slopes or after repeated use. This is especially valuable when you are carrying loads on rough or hilly ground.
Maintenance is reduced because the oil bath protects the brake surfaces. You will not need to adjust them as often as dry drum brakes, making ownership simpler for busy operators.
Parking Brake Type
The parking brake on the AGCO ST41A is mechanical. It is designed to lock the rear wheels in place when engaged.
This prevents the tractor from rolling, whether it is parked on level ground or a slope. The lever is located where you can reach it from the seat.
To set the brake, you simply pull the lever, and it traps the service brakes mechanically. It stays engaged until you manually release it, giving you peace of mind when leaving the tractor unattended.
A reliable parking brake is important for safety, especially if you need to park and load or attach implements on uneven terrain. The straightforward mechanical setup avoids complicated electronics and is easy to check and repair if needed.
Cab & Operator Station
The AGCO ST41A offers choices in cab and operator features that impact comfort and safety. You can choose which setup best fits your local climate, noise preferences, and daily work needs.
ROPS / Cab Option
The AGCO ST41A comes standard with a ROPS (Roll-Over Protective Structure) to help protect you if the tractor rolls over. ROPS is a common safety feature for tractors in this power range.
It is open, giving you better visibility and airflow, but offers no weather protection. Some models of the ST41A can be ordered with a fully enclosed cab.
With a cab, you are protected from rain, dust, sun, and wind. The cab version also adds doors, glass windows, and windshield wipers, helping you stay comfortable in harsh conditions.
Both ROPS and cab setups have their own seat belt systems for added safety. If you work in areas where weather can quickly change or where there is a lot of dust and debris, the cab model gives you better protection.
Climate Control (A/C, Heater, Filter)
With the cab option on the ST41A, you get heating and air conditioning. This means you can set a comfortable temperature year-round, whether in summer heat or winter cold.
The ventilation system helps move fresh air through the cab, lowering the risk of foggy windows. The air filtration system in the cab uses a replaceable cabin filter.
This filter helps reduce the amount of dust, pollen, and other particles that enter the cab. Your breathing comfort is improved, especially if you work in fields or dusty environments.
ROPS versions do not come with climate control, so you rely on the natural airflow. If you want climate control features, you must have the enclosed cab.
You can also adjust vents and fan speeds to fine-tune airflow.
Seat & Suspension
The AGCO ST41A is equipped with a high-back seat that can be adjusted for your height and weight. The seat has a suspension system that helps absorb bumps and jolts from rough fields.
This reduces body fatigue during long hours of use. On cab models, the seat often comes with fabric covering and may offer armrests for more comfort.
Controls for adjusting the seat position are usually easy to reach, so you can change your setup as needed without leaving your seat. If you spend a lot of time on your tractor every day, the suspension seat can make a significant difference in comfort.
The ROPS and cab versions have similar seat designs, but the cab may reduce vibrations and movement due to the enclosed structure.
Noise Level (dB A @ operator ear)
Noise levels at the operator’s ear can be significant, especially in tractors without a cab. ROPS models are usually louder because you are exposed to engine, transmission, and exterior sounds.
On the ST41A with just ROPS, the noise level is generally in the range of 85–95 dB(A), which is similar to standing next to a running lawnmower. Enclosed cab versions have better sound insulation.
The noise at your ear level drops by 5–10 decibels when you are inside the cab with the doors and windows closed. This makes it easier to have conversations or listen to a radio while operating the tractor.
Ear protection may still be recommended, especially during long workdays or with frequent operation at high RPMs. Lower noise levels help reduce fatigue and support better focus during your work.
| Feature | ROPS (Open) | Enclosed Cab |
|---|---|---|
| Weather Protection | None; exposed to weather | Full protection from rain, wind, dust, sun |
| Climate Control | No A/C or heat | Air conditioning, heater, and cabin filter |
| Seat Type | Suspension seat, adjustable | Suspension seat, adjustable, possible extras |
| Noise Level (dB A) | 85–95 dB(A), louder | 75–90 dB(A), quieter, less operator fatigue |
| Visibility | Excellent, unobstructed | Good, minor obstruction from cab frame |
| Air Quality | Open to outside dust and pollen | Filtered, improved air quality |
| Safety | ROPS structure, seat belt | ROPS included in cab, seat belt |
| Comfort for Long Hours | Basic comfort | Increased comfort, less vibration and noise |
Hydraulics
The AGCO ST41A uses a hydraulic system that supports both its implement and steering functions. Key details include the system type, flow rates, maximum system pressure, and the number and kind of remote valves available.
System Type (Open-Center / Closed-Center / PFC)
The AGCO ST41A is equipped with an open-center hydraulic system. In open-center systems, hydraulic fluid flows continuously through the pump, even when no function is being operated.
This setup is typical for compact and utility tractors in this horsepower range. You do not have the ability to prioritize oil flow to specific components unless you install aftermarket flow dividers.
Open-center hydraulics are generally easier to maintain and are cost-effective. There is no electronic control, automatic pressure compensation, or load sensing in this model.
You operate attached equipment using mechanical levers. Open-center systems are well-suited to basic loader or implement work, with steady flow at all times but less efficiency under varying loads compared to closed-center or pressure-flow compensated (PFC) systems.
Implement Pump Flow (L min⁻¹)
The main hydraulic pump on the AGCO ST41A delivers around 9.1 liters per minute (about 2.4 gallons per minute) of flow to the implement circuits. This flow rate is sufficient for common agricultural applications such as running small hydraulic cylinders, powering a loader, or operating a rear blade.
For higher-demand implements, the flow capacity might be limiting. If you plan to use attachments that require constant or high-volume hydraulic flow, such as hydraulic motors or post drivers, you may find the pump performance on the lower end.
Simple implements will perform well without noticeable lag or power loss.
Steering Pump Flow (if separate)
On the AGCO ST41A, the hydraulic pump for implements is also used for power steering. There is no separate dedicated steering pump.
This means the available flow from the hydraulic pump is shared between the steering system and the implement system. If you operate large implements while steering at the same time, flow to both may be reduced.
In most normal use, you will not notice a delay or stiffness in the steering function. However, heavy use of both systems might create slower implement response or steering effort under load.
Total Combined Flow
The total hydraulic pump output for the AGCO ST41A is about 9.1 liters per minute, which is the combined flow for both the implement and steering circuits. There is no additional or supplementary pump for extra flow.
All hydraulic-powered functions must share this single source of hydraulic oil. If you use multiple hydraulic systems at once, expect some decrease in speed and responsiveness.
System Pressure (bar / psi)
The AGCO ST41A operates its hydraulic system at a maximum pressure of around 160 bar (about 2,320 psi). This pressure level is within the expected range for compact tractors and supports lifting, tilting, and other hydraulic operations.
High-pressure systems usually provide more lifting and breakout force, but the total capability is also limited by hydraulic flow. Routine maintenance is crucial to keep system pressure at peak levels.
A drop in system pressure can impact loader lift, implement function, and steering performance. Make sure to check hydraulic fluid levels and filter condition regularly.
Remote Valves (number & type)
The AGCO ST41A typically comes with one or two rear remote hydraulic valves, depending on configuration and dealer options. These valves are standard dual-action (double-acting), allowing you to extend or retract hydraulic cylinders or operate bi-directional motors.
The controls are mechanically operated from within the cab or operator station. Some users may choose to install additional remotes if more hydraulic functions are needed.
Each remote valve adds more flexibility for using implements like rear blades, grapples, or log splitters. Check your tractor’s specification plate or consult your dealer for the exact number of installed remote valves.
| Feature | Specification/Description |
|---|---|
| System Type | Open-center hydraulic system, shared flow for implement and steering functions |
| Implement Pump Flow | Approx. 9.1 L/min (2.4 gpm) |
| Steering Pump Flow | Shared with implement pump, no separate pump |
| Total Combined Flow | 9.1 L/min (applies to both implement and steering systems) |
| System Pressure | Approx. 160 bar (2,320 psi) |
| Remote Valves | 1–2 rear remotes, double-acting, mechanically actuated |
| Additional Notes | Ideal for basic tractor applications, can be limiting for high-demand or simultaneous operations |
Three-Point Hitch (3PH)
The AGCO ST41A comes with a rear three-point hitch, which is a central feature for attaching a wide range of implements. Key factors include the hitch category, lifting strength at the ends, how you control hitch arms, and if it offers top-link sensing features.
| Feature | AGCO ST41A 3PH Details |
|---|---|
| Hitch Category | Category I/N |
| Lift Capacity @ Ball Ends | Around 2,646 lb (1,200 kg) |
| Draft / Position Control | Position Control Standard |
| Top-Link Sensing | No |
Hitch Category (1 / 1N / 2 / 3)
The AGCO ST41A uses a Category I/N three-point hitch. This means the hitch is designed to fit implements that require a Category I or narrow (1N) setup.
Category I hitches are standard for compact and utility tractors with 40 hp like this one. You have hitch pin diameters of 7/8 inch for the lower links and 3/4 inch for the top link.
This sizing supports a wide variety of common implements, such as mowers, tillers, and blade attachments. Compatibility with both Cat. I and Cat. I-Narrow lets you use a wider range of equipment.
Some equipment made for larger tracts (Category II or higher) will not fit this tractor’s hitch without adapters.
Lift Capacity @ Ball Ends
The lift capacity at the ball ends is a key spec for knowing how heavy an implement you can raise or lower. The ST41A has a lift capacity at 24 inches behind the ball ends of about 2,646 lb (1,200 kg).
This allows you to use medium-weight implements like rotary cutters, box blades, and small plows with comfort. Heavier, commercial-grade implements may exceed the safe capacity of this tractor’s hitch.
Since the rated value is measured at 24 inches behind the ball ends, actual capacity at the ends is a little higher. However, it is safest to stay within the rated limits to avoid strain or risk of breakdown.
Draft / Position Control
The AGCO ST41A supports standard position control. With this system, you set the height of the attached implement, and the lift maintains that position as you work.
The tractor does not usually have automatic draft control, which is more common on larger tractors. Position control is simple to use and works well for most general farm jobs.
You use a lever in the cab to set the position of implements like grader blades, sprayers, or mowers. This gives you steady and repeatable performance as you work on different terrain or crop types.
Top-Link Sensing (Yes/No)
Top-link sensing is not included on the AGCO ST41A. Top-link sensing is a feature that helps with draft control by automatically adjusting the lift arms based on the top link’s feedback.
Without top-link sensing, you control the implement height by manually adjusting the position lever. This setup is simpler and reduces cost and maintenance.
While larger tractors sometimes use top-link sensing for heavy tillage or plowing, most basic fieldwork with the ST41A is effective without it. For typical mowing, grading, or light tillage work, you will not need top-link sensitivity.
Axles & Load Limits
You need to know the load limits and axle types to safely use the AGCO ST41A Tractor. The right information ensures you stay within safe working conditions for different tasks.
Maximum Front-Axle Load (kg)
The front axle of the AGCO ST41A is designed to handle a variety of implements and heavy front attachments. To avoid overloading and potential axle damage, you have to respect its specific load rating.
Although the exact maximum front-axle load is not widely documented, typical tractors in this power class have a front axle load limit close to 1,000 – 1,200 kg. Always check your owner’s manual or manufacturer guidelines for the exact rating because adding attachments like front-end loaders or heavyweights can put more stress on the front axle.
If you work on uneven ground, the load should be distributed evenly across the front tires. It’s essential to check the tire pressure and condition regularly.
Using weights or larger implements without considering the front axle limit may lead to steering issues, excessive tire wear, or even component failure. Keeping within recommended specifications allows you to use the tractor safely and prevent damage.
Maximum Rear-Axle Load (kg)
The rear axle carries much of the load, especially when you use heavy three-point hitch implements. For the AGCO ST41A, the rear axle can safely handle more weight than the front.
The typical maximum rear lift capacity at 24 inches behind the ball ends is around 1,150 kg (2,535 lbs), which gives you a strong baseline for safe operation. Many users load ballast or attach heavy equipment, so it’s important not to exceed the manufacturer’s recommended rear axle weight.
Staying within the limit maintains stability, especially when operating on slopes or transporting heavy loads. Regular inspection for leaks, worn bearings, or unusual noises in the rear axle is important.
Adhering to the specified load limits extends the service life and reliability of your tractor.
Final-Drive Type
The AGCO ST41A uses an outboard spur gear final drive system. This design is common for tractors in this class because it offers efficient power transfer and is relatively easy to maintain.
Outboard systems place the final reduction gears at the ends of the axle, outside the main transmission. This configuration provides several advantages for you as an operator:
- Better Weight Distribution: Outboard drives help spread the weight more evenly across the wheels.
- Easier Maintenance: Access to gears is simpler than with inboard designs.
- Ruggedness: Spur gears are robust and designed for the demands of farm work, handling repeated heavy loads and shocks.
Maintain the right lubrication and check for any unusual wear to avoid downtime. If you notice loud gear noise or leaking oil, inspect the final drive to prevent bigger problems.
| Feature | Specification or Note | Importance for You |
|---|---|---|
| Maximum Front-Axle Load (kg) | ~1,000–1,200* | Keep under limit to avoid axle and steering issues |
| Maximum Rear-Axle Load (kg) | 1,150 kg (2,535 lbs) at 24 in. lift point | Supports heavy implements; don’t overload |
| Final-Drive Type | Outboard spur gear | Durable, easy to maintain, even weight transfer |
| Maintenance Tips | Inspect for leaks, check tire pressures, lubrication | Extends lifespan, prevents breakdowns |
*Actual limits should be confirmed in the owner’s manual or by contacting your dealership.
Tires & Track Options
The AGCO ST41A tractor gives you various choices for tires and track equipment, so you can match the machine to different jobs and conditions. You can also add flotation kits or select from different attachments to help with grip and soil protection.
Standard Front Tire Size (Ag / Turf / Industrial)
You can choose from agriculture (Ag), turf, or industrial tires for the front wheels. The standard Ag tire for the front is typically sized to maximize traction in fieldwork, especially when using attachments like loaders or mowers.
Turf tires are wider and have a less aggressive tread, protecting the grass and reducing soil disturbance on lawns or golf courses. Industrial tires, while less common, are used for jobs on hard surfaces or construction areas.
| Tire Type | Typical Size | Best For |
|---|---|---|
| Ag (R1) | 8.00-16 to 9.5-16 | Row crops, general fieldwork |
| Turf (R3) | 27×8.50-15 | Lawns, parks, grounds |
| Industrial | 10.5/80-18 | Construction, rough or mixed surfaces |
Switching to different front tires is straightforward and gives you flexibility if your work changes throughout the year. Always check compatibility if adding attachments such as front loaders, as tire footprint and clearance may vary.
Standard Rear Tire Size
For the rear wheels, Ag tires generally come standard for the ST41A. These offer the deepest tread, providing solid traction when pulling implements or working in loose soils.
Common Ag rear tires sizes include 13.6-24 or similar, balancing grip and ride comfort. Turf rear tires are available and are recommended if your tasks involve minimal soil damage, such as sports fields or sensitive landscaping.
| Tire Type | Typical Size | Best For |
|---|---|---|
| Ag (R1) | 13.6-24 | Tillage, heavy pulling, wet ground |
| Turf (R3) | 41×14.00-20 | Grass, turf, parks |
| Industrial | 16.9-24 | Hard ground, utility, loader work |
You can install rear wheel weights or add fluid ballast for extra stability, especially if you’re running heavy attachments on hilly ground or soft soil.
Optional Duals / Tracks / Flotation Kits
The ST41A can be fitted with extra options to help in specific conditions. Dual rear wheels are possible, increasing the contact area for better grip in mud or soft soil and reducing soil compaction.
Track kits are less common but may be adapted from aftermarket suppliers. They improve flotation and traction in wet fields.
Flotation tires offer a wider profile and lower ground pressure. This makes them ideal for row crop work where crop roots or delicate terrain need protection.
Available flotation kits and duals mounting systems might require specific hubs or spacers. Check with your dealer for recommended hardware.
You should also review how these options affect tire clearances, fender space, and local transport laws.
| Option | Use/Benefit | Notes/Compatibility |
|---|---|---|
| Dual Rear Wheels | Traction, less compaction | Requires hub adapters |
| Track Conversion | Maximum flotation, wet fields | Less common, aftermarket |
| Flotation Tires | Wide footprint, crop protection | May need fender adjustment |
Upgrading to these options lets you adapt the tractor to heavier loads, muddy sites, or fragile grounds with less risk of getting stuck or causing ruts. Attachments like loaders or rear implements may also perform better with the right tire or track setup.
| Feature/Option | Front Tire Choices | Rear Tire Choices | Optional Upgrades | Best For |
|---|---|---|---|---|
| Ag (R1) | 8.00-16, 9.5-16 | 13.6-24 | Duals, Ballast Weights | Field, row crop, wet soil |
| Turf (R3) | 27×8.50-15 | 41×14.00-20 | Flotation Kits | Turf, lawns, grounds |
| Industrial | 10.5/80-18 | 16.9-24 | Loader Attachments | Construction, rough surfaces |
| Tracks | N/A | Aftermarket available | Track Conversion Kits | Maximum flotation, muddy fields |
| Flotation | Wide turf/Ag available | Wide turf/Ag available | Flotation tire packages | Low compaction, crop safety |
Dimensions & Weight
The AGCO ST41A is a compact utility tractor designed with well-balanced proportions. Key design considerations include its overall length, height, width, and weight, all of which make it easier to operate and transport for a variety of farm and landscaping jobs.
Wheelbase
The wheelbase of the AGCO ST41A is 70 inches (177 cm). This distance, measured from the center of the front axle to the center of the rear axle, plays a big part in stability and maneuverability.
A 70-inch wheelbase ensures a steady ride across uneven ground and provides reliable traction during heavy-duty tasks. A longer wheelbase usually means a smoother ride, while a compact wheelbase, like the one on the ST41A, offers sharper turns.
This wheelbase makes it easier to navigate tight spaces such as barns, orchards, and fields with obstacles. The design aims to balance turning radius with stability, which is important if you work on varying terrain.
You’ll find that this compact utility tractor performs well at both low and moderate speeds, especially when handling substantial implements or attachments. Even with heavy loads, the 70-inch wheelbase helps maintain even weight distribution.
Overall Length
The AGCO ST41A has a total length of 121 inches (307 cm). Overall length influences storage requirements, transport convenience, and field maneuverability.
With a length of just over 10 feet, this tractor can fit in standard garages or sheds, making it easier to store in smaller spaces. Its length also supports stability when using rear-mounted implements.
Attachments like mowers, backhoes, or tillers typically require some extra clearance behind the tractor, and the ST41A’s size gives enough room for most standard equipment. For transportation, both on a trailer or by truck, the length keeps loading and unloading simple.
Despite being a compact tractor, the AGCO ST41A’s frame does not feel cramped. There is enough distance between the operator’s platform and the working end of implements to reduce crowding, helping provide a more comfortable user experience.
Overall Width (Minimum Tread)
The overall width of the AGCO ST41A is 62 inches (157 cm). This is the measurement at the tractor’s widest point, which typically corresponds to the minimum tread width for the rear tires.
For a compact utility tractor, this width is ideal for fitting into tight crop rows or negotiating narrow paths. A 62-inch width strikes a balance between stability and accessibility, allowing use on sloped land or in confined spots.
Wider tractors can offer better resistance to tipping, but for most general work, this width provides sufficient safety without limiting access. If you need to pass through gates or down garden rows, the design keeps this tractor versatile.
You may adjust tread settings or tire spacing depending on your specific needs, but for most work, the 62-inch minimum tread ensures that maneuvering and safety are top priorities.
Height to ROPS / Cab
The height of the AGCO ST41A to the top of the ROPS (Roll-Over Protective Structure) is 81 inches (205 cm). This is also referred to as the cab height in models equipped with an enclosed cab.
The height is important for two reasons: operator safety and the ability to fit under low clearances. An 81-inch height means most operators can clear barn doors, tree branches, and low-hanging features, especially if you do not have an enclosed cab.
This keeps the tractor practical for work both indoors and outdoors. The ROPS is a life-saving safety feature, so the height also ensures you get substantial protection without making the tractor impractically tall.
For operators who need to transport the tractor between job sites, the modest height fits onto most trailers and under standard bridge clearances. Whether you are storing the tractor or working in spaces with roof restrictions, this height delivers solid usability.
Ground Clearance
The ground clearance of the AGCO ST41A is 13 inches (33 cm). This measurement is the distance from the ground to the lowest fixed point of the tractor, aside from the wheels.
Higher ground clearance helps prevent snagging on rocks, debris, or uneven ground, which is especially helpful for field, orchard, and garden work. Thirteen inches of ground clearance enables you to drive over rough land without worrying much about damaging the undercarriage.
It also helps during seasonal work, such as plowing snow or moving through muddy fields, where extra clearance is needed. This clearance means the tractor is not only at home on manicured turf but can also handle jobs on less maintained or more rugged terrain.
Shipping Weight
The AGCO ST41A has a shipping weight of 2,888 pounds (1,309 kg). Shipping weight refers to the weight of the tractor as delivered from the factory, without fluids, implements, or extra ballast.
This factor affects transportation, handling, and delivery options. A shipping weight under 3,000 pounds means you can usually move this compact utility tractor with a standard dual-axle trailer and a mid-sized truck.
It lowers the risk of exceeding trailer limits and makes handling with forklifts or other loading equipment easier. This moderate weight gives you more flexibility for hauling and makes positioning the tractor for long-term storage or display simple.
You are less likely to need special permits or heavy-duty equipment for standard transport jobs due to the manageable weight.
Operating Weight (With Fluids)
The operating weight of the AGCO ST41A, with all fluids on board (fuel, oils, and coolants), typically matches the shipping weight closely, but may increase slightly depending on specific setup and installed equipment. With full fluids, you can expect the total to remain just under 2,900 pounds (about 1,310 kg), not including extra ballast or heavy tools.
Operating weight has a direct impact on traction, stability, and how the tractor handles, especially in hilly terrain or when using heavy attachments. The weight gives the machine a solid feel on the ground, minimizing slippage when towing or pushing loads.
When considering what equipment you’ll add, always factor in the little weight increase from fluids and attachments, so you keep the tractor within safe operating conditions.
| Specification | Imperial | Metric | Notes |
|---|---|---|---|
| Wheelbase | 70 inches | 177 cm | Stability & turning radius |
| Overall Length | 121 inches | 307 cm | Affects storage and transport |
| Overall Width (Min) | 62 inches | 157 cm | Minimum tread at widest point |
| Height to ROPS/Cab | 81 inches | 205 cm | Top of ROPS, clearance needs |
| Ground Clearance | 13 inches | 33 cm | Room under tractor for obstacles |
| Shipping Weight | 2,888 lbs | 1,309 kg | No fluids, basic units only |
| Operating Weight | ~2,900 lbs (approx.) | ~1,310 kg | With fluids, not including ballast |
Fuel & Fluids
Proper fluids are essential for the performance and reliability of your AGCO ST41A tractor. The right capacities and types help protect engine and hydraulic components and support efficient operation during demanding tasks.
Fuel-Tank Capacity
The AGCO ST41A uses diesel fuel and is equipped with a standard fuel tank designed for extended use. The tank holds approximately 7.9 gallons (30 liters), allowing for several hours of fieldwork without refueling.
A clean fuel system is crucial. This model typically uses a Baldwin PF937 fuel filter or similar type, which helps remove particulates and water.
The fuel filter promotes smoother performance and protects the fuel injectors from contamination. Regular replacements of fuel filters, including following the manufacturer’s guidance or every 200 hours, help prevent starting and running issues.
Some versions may use filters that cross-reference to the Yanmar 104500-55710 or those with similar thread sizes compatible with AGCO systems. Using high-quality filters made with cellulose media can trap contaminants more effectively.
Checking for proper thread size when replacing filters ensures a secure fit and prevents leaks.
DEF-Tank Capacity (If Applicable)
The AGCO ST41A tractor does not use a DEF (Diesel Exhaust Fluid) system. DEF tanks are commonly found on larger tractors that meet certain emissions standards, but are not present on the ST41A.
You do not need to refill or monitor a DEF tank on this machine, which simplifies routine maintenance. This means you only need to focus on standard diesel fuel for operation and don’t have to budget or plan for DEF fluid use or storage.
No sensor checks, refill schedules, or level warnings for DEF apply to this tractor.
Engine Oil Capacity
Engine lubrication is vital to the AGCO ST41A’s performance. The tractor’s 3-cylinder, turbocharged diesel engine has an engine oil capacity of approximately 4.2 quarts (4 liters).
Check the oil with the dipstick and stay within the safe range. You should use high-quality diesel engine oil that meets the manufacturer’s viscosity and performance specifications.
Replace the engine oil filter along with every oil change. OEM or compatible options, like the Ford SBA130366040, should be used for proper filtration and fit.
Check filters for proper thread size to avoid leaks or fit issues. Ensure the oil filter media, like cellulose, captures contaminants that could damage engine components.
Keeping to a regular maintenance schedule, such as every 100-150 hours, will help the engine last longer.
Hydraulic/Transmission Oil Capacity
The AGCO ST41A shares oil between its hydraulic and transmission systems. This combined hydraulic/transmission oil reservoir holds around 5.8 gallons (22 liters), depending on configuration.
You should use the recommended universal tractor fluid or hydraulic/transmission oil specified by AGCO. Regular fluid checks are important as even small leaks can impact system pressure and smooth shifting.
The hydraulic system operates lift arms, the loader (if equipped), and other implements, so using clean oil helps prevent damage and maintain consistent power. Replace hydraulic/transmission oil filters at the intervals set by the manufacturer.
Always match filter sizes and thread size before installation. Using filters with high-quality cellulose media is beneficial for capturing debris and keeping oil clean, which helps protect pumps and control valves.
| Feature | Capacity/Type | Filter(s) / Notes | Media | Thread Size |
|---|---|---|---|---|
| Fuel Tank | 7.9 gal (30 L) | Baldwin PF937, Yanmar 104500-55710 | Cellulose | Match to system (check manual) |
| DEF Tank | N/A (Not applicable) | None | N/A | N/A |
| Engine Oil | 4.2 qt (4 L) | Ford SBA130366040, OEM match | Cellulose | Match to engine (check manual) |
| Hydraulic/Transmission Oil | 5.8 gal (22 L) | OEM or aftermarket (spec matches) | Cellulose | Match to reservoir/system |
Electrical System
The AGCO ST41A tractor uses a reliable electrical system that supports its operation in the field and everyday use. Details like charging capability, ground type, and battery ratings matter for reliability, starting performance, and maintenance needs.
| Feature | Specification / Details |
|---|---|
| Ground Type | Negative |
| Alternator Type | 12-volt alternator, internal regulator |
| Alternator Output | Typically 40 – 50 amps |
| Battery Voltage | 12 volts |
| Battery CCA Rating | 600 – 800 CCA (Common Range for 40 hp tractors) |
Ground Type (Negative / Positive)
The AGCO ST41A tractor uses a negative ground electrical system. This setup is very common for utility tractors.
The negative terminal of the battery is connected directly to the chassis or frame of the tractor. Most farm equipment built after the 1960s uses this method.
Negative ground systems help prevent rust caused by electrolysis and are generally safer for operating electronic accessories. For maintenance or jumper cables, always connect the negative cable to a clean, unpainted spot on the chassis.
This helps avoid sparks near the battery and keeps the electrical system more reliable.
Alternator / Charging System
The charging system of the AGCO ST41A is centered around a 12-volt alternator. The alternator keeps the battery charged while the engine runs and supports all electrical needs, such as lights, starting motor, and dashboard displays.
Your tractor’s alternator most likely has an internal voltage regulator for steady voltage output. This regulation protects sensitive electronics and keeps your battery from overcharging.
If you notice your battery struggles to keep a charge, checking the alternator and its connections should be your first step. Most alternators on utility tractors like the ST41A are made to be durable and require minimal maintenance apart from occasional belt or wiring checks.
Charging Output (Amps)
The alternator on an AGCO ST41A typically has a rated output between 40 and 50 amps. This is enough to meet the demands of frequent engine starts, power the lights, and operate any auxiliary equipment that draws from the electrical system.
On cold days or when running extra accessories, this amperage keeps batteries at full strength. If you add aftermarket lights or accessories, confirm their power draw is appropriate for the alternator’s output.
Upgrading to a higher-output alternator is an option if you frequently use demanding attachments or operate at night.
Battery Voltage
The ST41A tractor uses a 12-volt battery system, compatible with most modern agricultural equipment. This allows you to replace the battery easily and use standard charging tools.
A 12-volt system is ideal for starting the diesel engine, running electrical controls, and supporting external connections for implements. Always check battery voltage before winter or periods of heavy use, as undercharging can lead to starting problems or damage to electronics.
If the battery drops under 12.4 volts when off, it may be time for maintenance or replacement.
Battery CCA Rating
Cold Cranking Amps (CCA) are critical for reliable starting, especially in low temperatures. For a 40-horsepower tractor like the AGCO ST41A, you should select a battery with a CCA rating between 600 and 800 amps.
This range ensures the battery can turn over the diesel engine in cold weather without sluggishness or failure. A battery with a CCA rating too low may cause hard starts, especially after sitting idle.
Always match the replacement battery to at least the minimum CCA recommended by the manufacturer. Regularly test your battery’s CCA if you notice slow starts or dim lights during operation.
Total Cost of Ownership Metrics
Understanding your AGCO ST41A’s total cost of ownership means looking at maintenance cycles, how much you might pay for yearly upkeep, how quickly the tractor loses value, and how much fuel it needs under regular use. Warranty coverage is another critical part that can lower your risk and costs.
| Metric | Details |
|---|---|
| Service Interval | 50-500 hours (varies by system and part) |
| Annual Maintenance Cost | $700–$1,200 per year |
| Depreciation (Year 1-5) | 15% first year, 10% following years (average) |
| Fuel Use @ Rated Load | 7.0–8.5 L/hr (diesel engine, 40 hp class) |
| Typical Warranty | 2-year limited warranty |
Recommended Service Intervals
For the AGCO ST41A, you will need to check and replace fluids, filters, and wear items regularly. The engine oil and filter are usually changed every 100 hours.
Transmission and hydraulic oil should be inspected every 250 hours and replaced at 500 hours. Air filters and fuel filters may need service every 200-250 hours, depending on working conditions.
Tire pressure, battery, and electrical systems should get checked before each use.
Example of Key Intervals:
- Engine oil: 100 hours
- Hydraulic oil: 250-500 hours
- Fuel filter: 200 hours
Estimated Annual Maintenance Cost
Maintenance for the AGCO ST41A 40 hp tractor typically costs between $700 and $1,200 each year. This covers filters, fluids, belts, minor parts, and regular inspections.
Labor costs can add up if you use a dealer for service instead of doing it yourself. More intensive repairs or component replacements, like hydraulic pumps or electrical parts, can push your annual cost higher.
Warranty coverage might pay for major repairs the first two years, often lowering your costs if issues come up early in the tractor’s life. Keeping service records is wise, especially if you plan to sell or trade in your tractor before its value drops significantly.
Depreciation Curve (% Per Year)
A new AGCO ST41A loses about 15% of its value in the first year. Over the next four years, expect depreciation of about 10% per year.
By year five, most 40 hp tractors keep roughly 50-55% of their original value, depending on hours, condition, and service history. After the warranty expires, retained value may drop faster.
Tractors used for light-duty work with low hours tend to hold value better. Documenting all service and repairs also boosts resale value.
| Year of Ownership | Depreciation (%) | Value Retained (%) |
|---|---|---|
| 1 | 15 | 85 |
| 2 | 10 | 75 |
| 3 | 10 | 65 |
| 4 | 10 | 55 |
| 5 | 10 | 50 |
Fuel Consumption @ Rated Load (L hr⁻¹)
Your AGCO ST41A will use between 7.0 and 8.5 liters of diesel per hour at full rated load. Real-world fuel use varies with the implement, soil conditions, and driving habits.
Light to moderate loads can lower fuel use to about 4.5–6 liters per hour. Clean air filters, proper tire inflation, and routine engine maintenance help maintain optimal fuel efficiency.
You can expect higher fuel costs when running heavy PTO-driven equipment or working in tough field conditions for extended periods. Monitoring and logging your actual fuel use can help you plan operating budgets more accurately.