AGCO ST40 Tractor 40 hp Specifications, Features, and Performance Overview
AGCO ST40 Tractor 40 Hp
The AGCO ST40 is a compact utility tractor designed for small farms and properties. You get about 40 horsepower from its diesel engine, making it suitable for mowing, hauling, loader work, and light tillage.
AGCO distributed this model, but it was manufactured by Iseki, a company known for building reliable tractors. The engine’s gross power is around 40.1 hp, while the net engine power is about 37.5 hp.
You can use the SL46 loader with the ST40, which lets you move dirt, gravel, feed, or materials easily. With this loader attached, everyday chores become much easier to manage.
The AGCO ST40 has a power take-off (PTO) with about 32.4 hp for running tools like mowers or tillers. This means you can use many different implements, which adds to its versatility as a compact tractor.
Here is a table summarizing key features:
| Feature | Specification |
|---|---|
| Engine Output | 40.1 hp (gross), 37.5 hp (net) |
| Manufacturer | Iseki (distributed by AGCO) |
| PTO Power | 32.4 hp (gear PTO, claimed) |
| Displacement | About 1.5 liters |
| Loader | Supports SL46 loader |
| Tractor Type | Compact utility tractor |
You get simple controls and easy maintenance. The design matches many needs for property owners, landscapers, and those needing a compact tractor with reliable power.
Production & Identification
The AGCO ST40 is a compact utility tractor that was produced for demanding jobs on small farms and large properties. It was developed through a collaboration between AGCO and Iseki, connecting Japanese engineering with a well-known global agricultural brand.
Manufacturer / Brand
The AGCO ST40 was sold under the AGCO name, which is a major brand in the agricultural equipment industry. AGCO is known for producing a wide variety of machinery, serving customers around the world.
For the ST40 tractor, AGCO partnered with Iseki, a respected Japanese manufacturer. Iseki actually built the tractor, and it was then distributed and branded by AGCO.
This partnership allowed AGCO to offer high-quality, reliable compact tractors made with Japanese technology. The involvement of Iseki means that the ST40 shares design characteristics and parts with some other Iseki-made tractors, marketed globally under different brands.
You’ll frequently hear about comparable models from other brands like Massey Ferguson, John Deere, Kioti, New Holland, Kubota, Branson, and McCormick. Some of these companies marketed similar or near-identical machines under their own colors and logos.
Model Number / Series
The ST40 belongs to the AGCO ST Series, which also includes other models such as the ST35 and ST45. The “ST” naming stands for “Sub-compact Tractor” or “Small Tractor,” highlighting the series’ target uses in light utility work.
AGCO organized this series to cover power ranges suited to smallholder needs through to light commercial use. Each model number, like ST35, ST40, or ST45, reflects the approximate engine horsepower, making it easy to compare and choose between series models.
Within the ST series, the ST40 is known for its balance of power and size. It comes with a 40-horsepower diesel engine, which marks it as one of the more capable tractors in its class for lifting, towing, or powering implements.
Choosing the right model from the ST series means you can match horsepower and features to your needs. ST40 was sold alongside alternative options during the early 2000s, providing more selection for buyers.
Factory of Manufacture
The ST40 was manufactured by Iseki at its facilities in Japan. Iseki has a long track record of building reliable agricultural machines for both domestic and export markets.
Japanese manufacturing practices ensured the tractor met strict quality and reliability standards. AGCO sourced these tractors from Iseki’s advanced factories, then handled international branding and distribution.
As a result, this model carries Japanese engineering at its core, regardless of the brand name found on the hood. Iseki-manufactured tractors have earned a positive reputation worldwide, with plants supplying units for brands like Massey Ferguson and AGCO.
This approach allowed customers in North America and Europe to buy tractors made in Japan with support from local AGCO dealers.
Years Produced
The AGCO ST40 was part of the ST Series, which was available from about 2001 to 2004. These years mark the main production run for this tractor, although certain markets may have seen introduction or phase-out dates shift by a year depending on local availability.
During its production, the ST40 competed with similar compact tractors offered by other major brands, such as John Deere, New Holland, Kubota, Kioti, Branson, and McCormick. Each brand offered tractors with similar sizes and horsepower, making this a dynamic and competitive market segment.
If you are looking at a used ST40, the majority of units you’ll find were built within this 2001–2004 window.
Original List Price (Launch Year)
When the AGCO ST40 first came to market, it carried a price in line with similar compact tractors from rival brands. While the exact launch price may vary by dealer and market, compact utility tractors of this class typically ranged from $17,000 to $21,000 new during the early 2000s.
The actual price depended on factory options, region, and currency exchange rates at that time. Optional equipment such as front loaders, cabs, or tire upgrades could add noticeably to the price tag.
Even used today, the ST40 maintains value due to its reputation for reliability and the Iseki-built engine. Prices for used machines will depend on condition, hours, and attachments included.
Serial-Number Location
You can find the serial number plate for the AGCO ST40 tractor in a few common locations, mainly on the tractor’s frame. For most units, the plate is attached under the operator’s seat or along the right side of the tractor frame, just behind the front tire.
The serial number is essential for identifying your specific tractor, ordering parts, or checking service history. If you buy a used ST40 or need replacement components, always refer to this number.
Write down your serial number before contacting a dealer for support. This will help track the right documentation, especially when verifying the model or matching it to service bulletins.
AGCO ST40 Production & Identification Overview
| Topic | Details |
|---|---|
| Manufacturer / Brand | AGCO (distributed, branded); Iseki (manufactured, engineered) |
| Model Number / Series | ST40, part of AGCO ST Series (ST35, ST40, ST45) |
| Factory of Manufacture | Iseki manufacturing plants in Japan |
| Years Produced | 2001–2004 |
| Original List Price | Approximately $17,000–$21,000 USD (launch price, varies with options/region) |
| Serial-Number Location | Frame under operator’s seat or right side of chassis, near front tire |
Engine Specifications
The AGCO ST40 is equipped with a robust diesel engine designed for reliability and consistent performance in tough working environments. Key details like horsepower, displacement, emissions, and cooling all contribute to its effectiveness for utility tasks.
Engine Make & Model
You get a 3-cylinder Iseki E3CD diesel engine in the ST40. Iseki is a trusted Japanese manufacturer, well known for building engines that balance fuel efficiency and durability.
The E3CD turbocharged engine ensures quick response under load. Turbocharging increases air intake and power output while keeping fuel use lower compared to non-turbo models.
This model benefits from liquid cooling. The Iseki E3CD engine is a common powerplant in compact utility tractors due to its long service intervals and solid build quality.
Fuel Type & Emissions Tier
Your tractor runs on standard diesel fuel. Diesel engines are known for higher torque at low rpm, making them suitable for agricultural and utility work.
This helps when operating implements or towing heavy loads. While the specific emissions tier of the ST40 is not detailed, the model was produced during years when new emission regulations were introduced.
Many compact tractors from this era meet EPA Tier 2 or Tier 3 standards, which reduce harmful exhaust gases. Fuel is delivered via a direct injection system, improving efficiency and cold-weather starting.
There is no need to use gasoline or other fuel types in this model.
Cylinders / Displacement
The AGCO ST40 engine is a 3-cylinder design, which offers a smoother and more balanced operation than single- or two-cylinder engines. This means less vibration and quieter running.
Displacement is 1.5 liters (1,500 cc) or 91.4 cubic inches. Displacement measures the total volume of all the cylinders and impacts both power and torque.
A moderate displacement with three cylinders provides a good mix of power, fuel efficiency, and engine life. This layout is typical in tractors for light-to-medium duties.
Rated Horsepower (Gross & Net)
Rated horsepower is a key measure of engine strength. For the ST40, the gross engine horsepower is 40.1 hp (29.9 kW).
This is the maximum output measured at the flywheel before any losses. Net horsepower refers to the power available to do actual work after subtracting engine-driven accessories.
In this model, net horsepower is 37.5 hp (28.0 kW). You may also see PTO (Power Take-Off) horsepower listed.
For gears, it is about 32.4 hp, while the hydrostatic version is rated at 31.7 hp. This is the power available for implements driven by the PTO shaft.
Peak Torque (Nm @ rpm)
The peak torque of the Iseki E3CD engine provides strong pulling power for demanding jobs. Although exact figures for the AGCO ST40 are limited, 1.5L turbocharged diesel engines usually deliver torque in the range of 100–110 Nm (Newton-meters) at about 1,600–2,000 rpm.
Torque is crucial for tasks that require high power at low speeds, such as plowing or loader work. The broad torque curve means you get usable power even when engine speeds drop under load.
You can expect consistent and strong torque output suitable for a wide variety of attachments and towing.
Compression Ratio
The compression ratio in a diesel engine affects performance, efficiency, and emissions. The Iseki E3CD turbo diesel typically runs a compression ratio around 19:1.
A higher compression ratio means the engine compresses air more before the fuel is injected, enabling cleaner combustion and more efficient energy use. This high compression benefits cold starting and helps deliver more torque from the same size of engine.
You get a strong balance between torque, efficiency, and durability.
Cooling System & Capacity
The AGCO ST40 uses a liquid cooling system, which ensures stable engine temperatures in tough operating conditions. Liquid cooling, as opposed to air cooling, allows for better heat management and higher power output.
Coolant circulates through passages in the engine block and cylinder head, then moves through a radiator to release excess heat. The system holds around 6–8 liters (about 1.5 to 2 gallons) of coolant, depending on specific configuration.
A clean, high-quality air cleaner is also important in maintaining engine health. It prevents dust and debris from entering the cylinders and supports efficient combustion and engine longevity.
| Component | Specification / Details |
|---|---|
| Engine Make & Model | Iseki E3CD (Turbocharged Diesel) |
| Fuel Type & Emissions Tier | Diesel; EPA Tier 2/3 (typical for era) |
| Number of Cylinders | 3 |
| Displacement | 1.5 L (91.4 ci) |
| Rated Horsepower (Gross) | 40.1 hp (29.9 kW) |
| Rated Horsepower (Net) | 37.5 hp (28.0 kW) |
| PTO Horsepower (Gear/Hydro) | 32.4 hp / 31.7 hp |
| Peak Torque | 100–110 Nm @ 1,600–2,000 rpm (estimate) |
| Compression Ratio | ~19:1 |
| Cooling System & Capacity | Liquid cooled; 6–8 L (1.5–2 gallons) |
| Air Cleaner | Heavy-duty, replaceable filter |
Power Take-Off (PTO)
The AGCO ST40 tractor offers a PTO system designed to handle various implements. The setup focuses on independent control, reliable horsepower, and standard speeds to match your equipment.
Claimed PTO Horsepower
The AGCO ST40 is rated at about 33 horsepower at the PTO. This power rating is typical for a compact utility tractor with a 40-hp engine, giving you enough strength for 5-foot rotary cutters, tillers, and other mid-size implements.
You can expect stable performance when using power-hungry attachments. The engine speed required to achieve rated PTO horsepower is 2,430 RPM.
This setup helps you plan for the right match between tractor and attachment. It’s important to know the PTO horsepower so you do not overload the tractor and get the best results from your tools.
Table: PTO Horsepower
| Specification | Value |
|---|---|
| Engine HP | 40 hp |
| PTO HP | 33 hp (approximate) |
| Rated Engine RPM for PTO | 2,430 rpm |
PTO Type (Independent / Live / Economy)
The AGCO ST40 uses an independent rear PTO system. This design allows you to engage or disengage the PTO regardless of the tractor’s ground speed or whether you are pressing the clutch.
The system uses an electro-hydraulic wet disc clutch, so you can control PTO implements with a switch or lever. This setup is reliable and reduces wear on the clutch over time.
You do not have to stop moving or shift gears just to turn the PTO on or off. That means greater safety and efficiency, especially when mowing, tilling, or operating snowblowers.
Table: PTO Type
| Feature | Details |
|---|---|
| Rear PTO | Independent |
| Clutch Type | Electro-hydraulic wet disc |
| Control | Switch/lever, on-the-go |
| Efficiency | High, reduces gear wear |
PTO Speeds (540 / 1 000 rpm)
The AGCO ST40 comes standard with a 540 rpm rear PTO, which is the most common speed required by farm and landscaping attachments. The rear PTO achieves 540 rpm when the tractor’s engine runs at 2,430 rpm, letting you use bush hogs, finish mowers, and augers that require this industry standard.
An optional 2000 rpm mid PTO is sometimes available for use with front-mounted implements such as mowers or snowblowers. The ST40 does not offer a 1,000 rpm PTO, so it is not suited for larger, high-demand attachments.
Table: PTO Speeds
| PTO Position | PTO Speed | Application Examples | Engine RPM Required |
|---|---|---|---|
| Rear | 540 rpm | Standard implements (mowers, tillers, post hole diggers) | 2,430 rpm |
| Mid (optional) | 2,000 rpm | Front attachments (mid mowers, snowblowers) | N/A |
Transmission & Drivetrain
The AGCO ST40 offers strong transmission choices, multiple gear options, and a 4WD system for versatility. You can select the right model based on your preferred driving experience and specific job needs.
Transmission Type (Syncro, Powershift, CVT, HST)
You have three main transmission options with the AGCO ST40. These include an 8-speed synchronized shuttle, 16-speed power shuttle, and hydrostatic (HST) transmission.
The synchronized shuttle transmission uses a manual clutch and is good for tasks where you need to change direction often, such as loader work. The power shuttle lets you shift quickly between forward and reverse without using the clutch, which helps increase productivity.
The hydrostatic transmission provides smooth speed control and is easier for users who prefer simple, variable-speed operation.
The chart below compares the main transmission types:
| Transmission Type | Key Features | Best Use | Clutch Use |
|---|---|---|---|
| Syncro Shuttle | Manual shifting, uses clutch | General field work, loaders | Required |
| Power Shuttle | Clutchless forward/reverse shifting | Loader work, frequent reversing | Not required for F/R |
| Hydrostatic (HST) | Variable speed, pedal-controlled | Mowing, utility, beginner users | Not required |
Number of Gears / Ranges
Depending on your selection, the AGCO ST40 offers a range of gear options. The synchronized shuttle model has 8 forward and 8 reverse gears.
The power shuttle configuration gives you 16 forward and 16 reverse gears. This wide range makes it easier to find the right speed for any task.
The hydrostatic transmission uses infinite speed settings within each of its ranges. This makes it useful for jobs that need slow and steady movement, like mowing or working in tight areas.
Having more gears gives you better control of ground speed and torque. For tasks like tilling, you can select a lower gear for more pulling power.
For transport or light work, you can shift to a higher gear for more speed.
Top Transport Speed
The top transport speed of the AGCO ST40 varies based on transmission type and tire size. On most models, the maximum speed is around 17–19 mph (27–30 km/h).
This speed is suitable for moving the tractor quickly between job sites or fields. If you need to cover long distances on roads or farm lanes, this speed is fast enough to get you there without causing traffic problems.
Always check your tractor’s manual for precise speed details, as speed can depend on gear ratio, transmission selection, and the size of the tires fitted on your unit.
Drive (2WD / 4WD / AWD)
The AGCO ST40 is most often supplied as a 4WD (four-wheel drive) model. This feature increases traction in muddy or uneven conditions.
With 4WD, you can operate confidently on slopes, in fields, and while using heavy attachments. The extra traction reduces wheel slip, which means less wear on the tires and improved pulling performance for soil preparation and hauling.
There are no AWD (all-wheel drive) models—the 4WD system is either engaged or disengaged by the operator. Some earlier or special variants may be available as 2WD, but these are less common and do not provide the same traction benefits as the 4WD option.
Differential-Lock & Final Drives
To further boost traction, the AGCO ST40 comes with a locking rear differential. This mechanical feature allows both rear wheels to turn together, even if one slips or loses grip.
You engage the diff-lock with a foot pedal or lever on the operator’s platform. The final drives on the ST40 use a sturdy reduction gear system to increase torque at the wheels.
This gear design improves durability, handling, and reduces stress on the axles. When working in tough ground or pulling attachments, the differential-lock and strong final drives keep you moving, even in difficult field conditions.
Transmission & Drivetrain Quick Reference Table
| Feature | Options / Specs | Notes |
|---|---|---|
| Transmission Types | Syncro Shuttle, Power Shuttle, HST | All models feature user-friendly controls |
| Number of Gears | 8×8 (Syncro), 16×16 (Power), Infinite | More gears = finer control. HST allows variable speeds |
| Top Transport Speed | 17–19 mph (27–30 km/h) | Ideal for quick field-to-field travel |
| Drive | 4WD standard | Selectable on/off 4WD for versatility |
| Differential-Lock | Standard rear | Engaged when extra traction needed |
| Final Drives | Reduction gear type | Gives added torque and reliability at the wheels |
| Clutch | Dry single plate (manual), Not needed for power or HST | Used only in manual transmissions |
Steering & Brakes
You operate the AGCO ST40 with a hydrostatic power steering system and wet disc brakes. You also get a solid turning radius with brake assistance and a mechanical parking brake.
Steering System (Hydrostatic / Power-Assisted / Mechanical)
The AGCO ST40 uses a hydrostatic power steering system, which means you get smooth and easy steering even at low speeds and when carrying heavy loads. Hydrostatic steering relies on hydraulic pressure, helping you turn the wheel with less effort.
This setup is ideal for situations requiring frequent direction changes, such as loader work or mowing. Hydrostatic steering helps reduce arm fatigue and keeps control steady.
With this power-assisted system, you can make precise adjustments whether you are moving quickly or slowly. If you have used mechanical steering before, you will notice a significant difference in comfort and control.
Power steering in the ST40 is durable and built to last with fewer moving parts exposed to wear.
Turning Radius (With Brakes)
The AGCO ST40 offers a tight turning radius when you use the split brake pedals. This feature lets you brake one rear wheel independently from the other, improving maneuverability around obstacles or in small spaces.
Turning with brake assistance is helpful for tasks like turning at row ends or working near buildings. The ST40 can pivot more sharply by engaging a single brake, making fieldwork faster and less tiring.
You can use the brakes as needed for sharp corners or maintain a smoother arc for longer sweeps. With both the hydrostatic steering and brake-assisted turns, you get consistent control over your tractor, no matter the job.
Service Brakes (Wet Disc, Dry Drum, Etc.)
The ST40 is equipped with wet disc brakes. These brakes operate within a sealed, oil-filled chamber.
Wet disc systems do not dry out like dry drum brakes, and they resist fading from heat, even after repeated use. You get steady stopping power whether you are on a slope or pulling heavy equipment.
This type of brake is also low-maintenance because it stays lubricated and protected from dirt and water. Wet disc brakes are known for their reliability and long lifespan.
For safety, the brakes are responsive and provide good modulation, so you can stop smoothly without jerky motion.
Parking Brake Type
The AGCO ST40 has a mechanical parking brake. This type is simple and effective, using a lever or pedal to engage the brake and hold the tractor in place when parked.
You will find the parking brake easy to set and release, with clear engagement so you know when it is active. Mechanical parking systems do not rely on electrical or hydraulic parts.
This minimizes the chances of failure and makes the parking brake very dependable. Using the parking brake on slopes or during maintenance holds the tractor securely.
Keeping the tractor stable when parked is straightforward with the mechanical system.
| Feature | Type | Key Benefits | Maintenance |
|---|---|---|---|
| Steering System | Hydrostatic Power Steering | Easy, low-effort turning, precise control | Low |
| Turning Radius | Brakes-Assisted | Tight turns, high maneuverability | Minimal |
| Service Brakes | Wet Disc Brakes | Strong stopping power, works when wet, low wear | Low |
| Parking Brake | Mechanical (Lever/Pedal) | Simple, dependable hold while parked | Very Low |
Cab & Operator Station
Comfort, safety, and ease of use are important when you operate the AGCO ST40 tractor. Features like ROPS or cab options, climate controls, seat design, and noise levels affect your daily experience.
ROPS / Cab Option
The AGCO ST40 comes standard with a Roll Over Protective Structure (ROPS) for your safety. This feature protects you if the tractor rolls or tips over.
The ROPS bar is foldable, which helps you fit under low branches or structures. Some versions may offer an optional canopy that gives extra shade during hot days but does not enclose the cab.
There is no factory-installed fully enclosed cab available on most ST40 models. You may be able to add an aftermarket soft cab or weather enclosure, but these will offer only limited protection from the elements.
The open station design provides easy access when getting on or off the tractor. ROPS and open station tractors like the ST40 are common in this size class.
They maximize visibility and allow you to work in tight spaces.
Climate Control (A/C, Heater, Filter)
Since the ST40 is mainly an open station tractor without a fully enclosed cab, it does not come with traditional climate control features like air conditioning or a heater. You will not have a cab air filter because there is no enclosed environment to filter.
Most operators use hats, fans, or portable heaters if extra comfort is needed. For dust protection, you might use a facemask or install a basic windscreen.
If you add an aftermarket weather enclosure, some limited climate protection is possible, but temperature regulation and air quality are still basic compared to fully enclosed cab models. This simple setup keeps maintenance low but means you must prepare for weather and dust.
Seat & Suspension
The AGCO ST40 is equipped with a high-back, adjustable seat. The seat is mounted on a mechanical suspension system that absorbs bumps and reduces fatigue.
You can adjust the seat position front-to-back for your comfort, and the backrest angle can be changed for extra support. Armrests are often optional or may need to be added by the owner.
The seat covering is usually made of durable, weather-resistant vinyl, which makes cleaning easy. You will find the operator controls like steering wheel, throttle, and levers laid out close to the seat for convenience and reduced fatigue.
The deck is flat and free of obstacles, making it easy to move your feet or stand up safely if needed.
Noise Level (dB A @ Operator Ear)
Operating an open station tractor like the AGCO ST40 exposes you to engine and equipment noise. Typical noise levels for tractors in this power range are 80-90 dB(A) at the operator’s ear during normal use.
Noise levels will vary based on engine speed, load, and any attached implements. There is no cab insulation or extra soundproofing since the design is open.
You may notice engine noise, vibration, and equipment clatter, especially during heavy tasks or transport. Using foam earplugs or earmuffs can make your experience safer and more comfortable.
| Feature | Description | Options/Notes |
|---|---|---|
| ROPS / Cab Option | Foldable ROPS bar for safety, no factory cab | Optional canopy or soft cab |
| Climate Control | No A/C, heater, or cab filter; exposure to weather | Basic windscreen or aftermarket |
| Seat & Suspension | High-back adjustable seat, mechanical suspension, vinyl cover | Armrests optional, flat deck |
| Noise Level | 80-90 dB(A) at operator’s ear, open station design | Hearing protection recommended |
Hydraulics
The AGCO ST40 tractor uses an open-center hydraulic system with key features that support both implements and steering. Understanding specifications like pump flow and pressure helps you choose the right attachments and use the tractor safely and efficiently.
System Type (Open-Center / Closed-Center / PFC)
The AGCO ST40 is equipped with an open-center hydraulic system. In this design, fluid flows continuously through the system when no valves are activated.
This type is straightforward and dependable, making maintenance and repairs easier compared to closed-center or pressure-flow compensated (PFC) systems. Open-center hydraulics suit compact utility tractors like the ST40 because they offer consistent flow and pressure for most farm tasks.
Flow is only diverted when a remote valve or control is opened. When you operate an implement, the oil is directed to where it’s needed without complex electronics or valves.
Implement Pump Flow (L min⁻¹)
The ST40’s hydraulic system has a pump flow of around 6.3 gallons per minute (about 24 liters per minute). This flow rate determines how quickly hydraulic implements, like loaders or rear-mounted tools, will respond when used.
A flow rate of 24 L/min is sufficient for most small- and mid-size implements. For example, you can power single or dual hydraulic cylinders, run a loader bucket, or tilt a rear blade.
If you need to operate larger implements, always check their flow requirements. For tasks like basic loader work, this flow will offer smooth and predictable operation.
Steering Pump Flow (If Separate)
The ST40’s steering and implement hydraulics are integrated into a single pump system. There is no separate steering pump on this model.
This shared system means that the same source delivers oil flow for both the steering circuit and auxiliary implements. When you turn the wheel, hydraulic pressure is used by the power steering system.
During heavy implement use, you might notice some slight drop in steering responsiveness if both circuits are used at the same time. The system is engineered to minimize this effect.
Total Combined Flow
Total combined flow on the AGCO ST40 matches its main hydraulic pump capacity, which is 6.3 gallons per minute (24 liters per minute). Since the tractor uses a single-pump open-center system, this total is shared for both implement and steering functions.
You should consider this combined flow rate whenever operating hydraulic attachments simultaneously with steering. If demands exceed supply, flow rate to each function could be somewhat reduced, resulting in slower movements.
System Pressure (Bar / Psi)
The ST40 hydraulic system operates at a maximum pressure of 2,130 psi (about 147 bar). This is standard for compact tractors in this horsepower class and supports safe, consistent operation of most hydraulic attachments.
System pressure matters because it determines the force your implements can deliver. Higher pressure translates to more lifting or pushing power.
With the ST40, this maximum pressure is used by both the loader and 3-point hitch hydraulics. Always check that your attachments are rated for this pressure.
Remote Valves (Number & Type)
The exact number and type of remote valves on your AGCO ST40 may vary depending on your chosen configuration and dealership installation. Generally, this tractor is equipped with one or two rear remote hydraulic valves, allowing you to operate various implements.
These are typically double-acting spool valves, suitable for both one-way and two-way cylinder operation. Some models may offer an option for additional remotes, enabling control over more attachments at once.
If you plan to use several hydraulic tools, confirm the number of remotes during purchase. Additional valves can sometimes be installed by your dealer post-purchase if your work requires more than the standard setup.
| Hydraulic Feature | Specification | Details |
|---|---|---|
| System Type | Open-Center | Continuous oil flow in neutral |
| Implement Pump Flow | 24 L/min (6.3 gpm) | Shared with steering |
| Steering Pump Flow | Not separate | Integrated with implement pump |
| Total Combined Flow | 24 L/min (6.3 gpm) | All uses combined |
| System Pressure | 2,130 psi (147 bar) | Controls all hydraulic functions |
| Remote Valves | 1–2 standard (double-acting); expandable | Rear remotes; configuration dependent |
Three-Point Hitch (3PH)
The AGCO ST40 tractor features a rear three-point hitch for mounting and operating a wide range of implements. This system is built for flexibility, making it suitable for many agricultural jobs including tilling, mowing, and more.
Hitch Category (1 / 1N / 2 / 3)
The AGCO ST40’s three-point hitch uses a Category 1 setup. This is common among compact and utility tractors in the 30–45 horsepower range.
Category 1 hitches have lower links with a pin diameter of 7/8 inch and a spacing of about 26 inches between their lift arms. A Category 1 hitch fits most small farm implements, including box blades, rotary cutters, finish mowers, and tillers.
You can also use quick hitches with Category 1 implements as long as the attachment points are compatible. The Category 1 system keeps costs lower and widens your choice of implements.
If you plan to use Category 2 implements, you would need special bushings or adapters, but these are not standard.
Table: Hitch Category Specifications
| Feature | Category 1 (AGCO ST40) |
|---|---|
| Pin Diameter | 7/8 in |
| Arm Spacing | 26 in |
| Typical Use | Small/medium implements |
| Adapter Needed | For Category 2 Tools |
Lift Capacity @ Ball Ends
The AGCO ST40’s Category 1 hitch can lift about 2,200 pounds at the ball ends. This measurement tells you the heaviest implement the tractor can handle while keeping it stable and lifting it through its full range.
The lift arms are powered by hydraulic cylinders, giving you steady motion when raising or lowering implements. For most fieldwork, including use with rotary cutters, plows, or small disc harrows, this capacity is suitable.
Always stay under the maximum lift to avoid straining the hydraulics or risking safety. If using heavy implements, check both the lift rating and tractor balance before operation.
Table: Lift Capacity
| Specification | Value |
|---|---|
| Lift Point | Ball ends |
| Max Lift Capacity | Approx. 2,200 lbs |
Draft / Position Control
The ST40 three-point hitch is equipped with position control as a standard feature. Position control allows you to set the precise height of the implement and keep it at a fixed level during operation.
You can raise or lower the tool to match the crop, field, or job needs. Some tractors also offer draft control for ground-engaging implements like plows, but this is less common on compact or utility models like the ST40.
Draft control would automatically adjust the depth of the implement as soil resistance changes. On the ST40, if you need draft control, check if it’s available as an optional feature.
Table: Control Features
| Feature | Standard (ST40) | Optional |
|---|---|---|
| Position Control | Yes | – |
| Draft Control | No | May be available |
Top-Link Sensing (Yes/No)
The AGCO ST40 does not offer top-link sensing on its three-point hitch. Top-link sensing is a feature found on higher-end or larger tractors, often those with electronic draft control.
It uses sensors mounted on the top link to read implement forces and adjust the hitch response. Since the ST40 does not have this feature, you will need to make manual adjustments when working with draft implements.
Manual control is straightforward but requires your attention to field conditions, especially if working in varied soil.
Table: Top-Link Sensing Availability
| Feature | AGCO ST40 |
|---|---|
| Top-Link Sensing | No |
| Adjustment Type | Manual |
Axles & Load Limits
You need to understand how much weight each axle on the AGCO ST40 can support and what kind of final-drive system it uses. This information is useful for towing, field operations, and making sure you do not overload your tractor.
| Specification | Value/Details | Notes |
|---|---|---|
| Max Front-Axle Load | See manufacturer’s guidelines | Not directly listed; estimate cautiously |
| Max Rear-Axle Load | 1,300 kg at rear ends | 2,866 lbs; consider implement weight |
| Final-Drive Type | Gear-driven rear axle | Durable and typical for compact tractors |
Maximum Front-Axle Load (kg)
The AGCO ST40’s specific maximum front-axle load value is not listed in available resources. For safe operation, you should refer directly to the owner’s manual or your dealer.
In practice, the front axle holds the weight from the engine and any front-mounted attachments. If you use a front loader or other implements, make sure not to overload the axle.
Most compact tractors with similar power have front-axle limits around 900–1,100 kg, but this can vary. Proper tire pressure and axle maintenance are important to prevent front-axle failure.
Overloading the front axle can also affect steering and increase wear on front tires.
Maximum Rear-Axle Load (kg)
For the rear axle, the AGCO ST40 supports up to 1,300 kg (2,866 lbs) at the rear ends. If you mount tools or tow implements, keep this limit in mind.
At 610 mm (24 inches) behind the lift points, the load limit is 879 kg (1,940 lbs). This is important if you use heavy attachments that extend far behind the tractor.
The closer your load is to the axle, the more weight you can safely lift. Heavy-duty rear tires and proper ballasting help manage heavy loads.
Never exceed these limits, as it may cause axle damage or unsafe tractor handling.
Final-Drive Type
The AGCO ST40 uses a gear-driven final drive for its rear axle. This type transfers engine power reliably to the wheels using gears within the axle housing.
Gear-driven systems are popular in compact tractors because they are durable and require limited maintenance. Regular checks for oil leaks and gear noise help prevent long-term issues.
This setup provides steady power delivery for field and loader work. It’s an efficient and low-maintenance solution for utility tractors like the ST40.
Tires & Track Options
Choosing the right tires for your AGCO ST40 Tractor plays a big role in traction and ground pressure. Both front and rear tires come in multiple sizes and types to fit different farm work and land conditions.
Standard Front Tire Size (Ag / Turf / Industrial)
The AGCO ST40 supports different front tire options based on your needs:
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Agricultural tires are sized at 8-16. These tires have a deep tread pattern for better grip in fields and on soft ground.
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They help transfer engine power to the soil but may leave marks on grass or lawns.
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Turf tires generally have a size of 212/80D-15. These tires are designed with a gentler tread, which reduces soil disruption.
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They are a good choice if you use your tractor on finished lawns or parks.
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Industrial tires are not standard but may be available as aftermarket options from select dealers. These tires can provide increased durability and moderate grip for construction or loader work.
Standard Rear Tire Size
Rear tires on the AGCO ST40 are larger to help support most of the machine’s weight and add traction.
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Agricultural rear tires measure 13.6-24. These are the default for most fieldwork, offering deep lugs for maximum traction and load-carrying.
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Turf rear tires are available as 355/80D-20. The wider, flatter tread pattern lowers ground impact and prevents tearing up the grass.
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You may need to adjust the tire pressure depending on your rear tire choice to balance comfort, traction, and tire life.
Optional Duals / Tracks / Flotation Kits
While the AGCO ST40 does not come with factory tracks or dual wheels, you can often add these with aftermarket kits.
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Dual rear wheels can be fitted to spread the tractor’s weight over a larger area. This reduces soil compaction during planting or wet conditions, though it adds to the tractor’s width.
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Flotation kits are available from some suppliers. These usually include extra-wide tires for both front and rear axles and help you work on wet or loose soils.
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Tracks are uncommon but may be offered by specialty suppliers. Rubber track kits let you cross soft, muddy ground with less risk of getting stuck, but they will lower road speed.
Check compatibility with your dealer before buying optional kits, as some options may require upgrades to your axles or fenders.
| Option | Front Tire Size | Rear Tire Size | Purpose / Notes |
|---|---|---|---|
| Agricultural Tires (Standard) | 8-16 | 13.6-24 | Deep tread, good for fields and loose soil |
| Turf Tires (Optional) | 212/80D-15 | 355/80D-20 | Lower ground impact, best for lawns and parks |
| Industrial Tires (Aftermarket) | Varies | Varies | Durable, for loader/construction work |
| Dual Rear Wheels (Aftermarket) | N/A | Dual 13.6-24 or similar | Reduces compaction, widens tractor |
| Flotation Kits (Aftermarket) | Extra-wide sizes | Extra-wide sizes | Spreads weight, for soft/wet ground |
| Tracks (Special Order) | Small track units | Small track units | For very soft/muddy ground, less common |
Dimensions & Weight
The AGCO ST40 tractor is designed to be sturdy, compact, and practical for different types of fieldwork.
Wheelbase
The wheelbase of the AGCO ST40 measures 68.5 inches (173 cm). The wheelbase is the distance between the tractor’s front and rear wheels.
This length offers stability on various terrains and helps with safe turning, even on slopes or uneven surfaces. A moderate wheelbase like this one gives you a good mix of maneuverability and stability.
It prevents the tractor from tipping too easily on hilly ground. Changing attachments or moving in tight areas is easier due to this size.
The wheelbase also contributes to ride comfort, especially when traveling over rough ground. By spreading the tractor’s weight evenly, you experience less bumpiness and reduced wear on the tires.
Overall Length
The overall length of the AGCO ST40 is 121.5 inches (308 cm) from the front to the back. This length makes the tractor easy to park and store in smaller sheds or barns.
Compact dimensions like these allow for better movement in smaller fields or when working between rows. The size supports the use of a variety of attachments without sacrificing balance.
Pulling trailers or other equipment remains efficient, and the centered weight helps prevent back lift during use. For farms with narrow entrances or limited space, this length provides more flexibility and easier transport.
Overall Width (Minimum Tread)
The minimum tread width, or overall width, is 60.2 inches (152 cm). This width is critical for stability when operating on soft or uneven ground.
Wider stances lower the tractor’s center of gravity, making it less likely to tip on sloping fields or when carrying heavy implements. A width of just over five feet allows the tractor to fit into tighter spaces, such as smaller fields, orchards, or between garden rows.
You can easily pass through standard farm gates or storage doors. For homeowners or small-scale farmers, the manageable width means simpler handling in confined areas.
Wider widths also improve tire contact with the ground, giving better grip and less risk of sinking in mud or soft soil. This can improve your safety and protect your crops from unnecessary damage.
Height to ROPS / Cab
The height to the ROPS (Roll Over Protective Structure) measures 94.4 inches (239 cm). This figure shows how tall the tractor stands from the ground to the top of the safety frame.
Knowing this dimension helps you make sure your tractor fits under low structures or tree branches. This type of height is standard for utility tractors with roll-over protection.
It’s an important specification for operators who transport their tractors on trailers or store them inside buildings. Before entering garages, barns, or under overhead pipes, you should check these measurements carefully to avoid accidents.
Having sufficient clearance is also key when working in orchards or with overhead irrigation systems. If you add attachments or a cab, the actual height might increase slightly.
Always confirm before moving into areas with limited clearance to avoid costly damage to either your tractor or the surrounding property.
Ground Clearance
Ground clearance is the distance between the lowest part of the tractor and the ground below. While exact measurements for the AGCO ST40 are not always specified, tractors in this size range generally offer clearance around 12 to 16 inches (about 30-40 cm).
Adequate ground clearance prevents getting stuck on field debris, rocks, or uneven spots. It also protects important parts underneath, such as the transmission and axles.
High enough clearance helps you move smoothly over ridges, furrows, or irrigation lines without causing damage to the tractor or obstacles in the field. Proper clearance is especially important for row crop work, as it allows you to pass over small plants without crushing them.
If you need to service or clean the undercarriage, having more space is always beneficial.
Shipping Weight
The shipping weight of the AGCO ST40 is 3,323 lbs (1,507 kg). Shipping weight reflects the tractor’s mass without any added fluids, attachments, or extra equipment.
It is important for transport companies, as it helps plan for safe loading and delivery. If you order or move the tractor, knowing the exact shipping weight can prevent overloading trailers or trucks.
Proper weight also affects handling and trailer selection when moving tractors between fields or jobs. Some states and regions may have transport or road weight limits; this number ensures you stay within the rules and stay safe.
Dealers and buyers use this weight to calculate shipping costs, lifting needs, and unloading instructions. Using the published weight always ensures more accurate planning.
Operating Weight (With Fluids)
Operating weight is the tractor’s weight with all fluids such as fuel, oil, coolant, and hydraulic fluid, but without extra attachments. For the AGCO ST40, this is typically somewhat more than the shipping weight—often by an added 100 to 160 pounds (about 45-73 kg), depending on the size of the fuel tank and systems.
Operating weight impacts how the tractor behaves on soft or wet ground. Heavier operating weight gives extra grip (traction) to the tires, which is helpful for heavy-duty fieldwork.
At the same time, too much weight can compact soil or make the tractor sink in very muddy conditions. Always check your tractor’s exact operating weight before attaching large implements or trailering it with fluids inside.
This number helps with safe operation and keeps all systems running as intended.
Table: AGCO ST40 Dimensions & Weight
| Specification | Imperial | Metric | Notes |
|---|---|---|---|
| Wheelbase | 68.5 in | 173 cm | Front to rear axle distance |
| Overall Length | 121.5 in | 308 cm | Front to rear, bumper to end |
| Overall Width | 60.2 in | 152 cm | Minimum tread width |
| Height to ROPS | 94.4 in | 239 cm | Ground to top of roll bar (ROPS) |
| Ground Clearance | 12–16 in* | 30–40 cm* | Typical range, exact spec may vary |
| Shipping Weight | 3,323 lbs | 1,507 kg | No fluids, no attachments |
| Operating Weight | ~3,420–3,483 lbs | ~1,552–1,580 kg | With fluids, varies with fill level |
* Ground clearance is based on common compact utility tractor ranges; verify with manufacturer’s official specifications.
Fuel & Fluids
The AGCO ST40 tractor uses several key fluids to operate its engine, transmission, and hydraulic systems. Knowing the correct capacities and types will help you keep the machine running smoothly.
Fuel-Tank Capacity
The AGCO ST40 is fitted with a 7.9-gallon (29.9-liter) diesel fuel tank. This capacity supports the 1.5L turbocharged, 3-cylinder Iseki E3CD engine.
Diesel fuel is required, and the fuel system uses indirect injection for combustion. A large fuel tank means you can operate the tractor for several hours before refueling.
To prevent engine problems, use clean, high-quality diesel from a reliable source. Water or contaminants in the diesel can harm the fuel system and reduce engine performance.
Inspect the fuel tank for leaks and check the fuel filter regularly. If your tractor is stored outdoors, keep the tank full to minimize condensation, which can cause water buildup inside the tank.
DEF-Tank Capacity (If Applicable)
The AGCO ST40 does not use a Diesel Exhaust Fluid (DEF) system. The engine meets its emissions standards without selective catalytic reduction, so there is no DEF tank or fluid to maintain.
This means you do not need to worry about adding DEF or tracking DEF levels. No DEF-related maintenance or troubleshooting is required for this tractor.
You only need to focus on proper diesel fuel handling and storage.
Engine Oil Capacity
The engine in the ST40 requires regular oil checks and changes for reliable performance. The typical oil capacity is about 1.6 gallons (6 liters), but check your specific owner’s manual for the recommended amount and oil grade.
Always use oil that meets the manufacturer’s viscosity and quality specifications. Clean engine oil supports effective lubrication and helps control engine temperature during long workdays.
Change the oil and replace the oil filter based on the hours of use or the recommended service interval. Before changing oil, let the engine cool down to avoid burns.
Dispose of used oil according to local environmental regulations.
Hydraulic/Transmission Oil Capacity
The hydraulic and transmission systems in the AGCO ST40 often share a common reservoir. The combined oil capacity is approximately 6.9 gallons (26 liters), but this can vary by configuration, such as whether your tractor has a hydrostatic or gear transmission.
Use only hydraulic/transmission oil approved for compact utility tractors. The right oil keeps all moving parts lubricated and ensures smooth shifting, steering, and loader operations.
Check oil levels regularly and inspect for leaks or dirty oil. Change the oil and filter according to the maintenance schedule.
If you notice slow hydraulic response or noisy operation, confirm the fluid is at the correct level and in good condition.
AGCO ST40 Fuel & Fluid Capacities Table
| System/Component | Capacity | Type | Notes |
|---|---|---|---|
| Fuel Tank | 7.9 gal (29.9 L) | Diesel | Indirect injection; inspect filter and tank for water |
| DEF Tank | N/A | N/A | No DEF/urea required; emissions met without DEF system |
| Engine Oil | 1.6 gal (6 L) | Diesel engine oil | Change per schedule; match specifications and viscosity |
| Hydraulic/Transmission | 6.9 gal (26 L)* | Hydraulic/Transmission | Shared system; check level and change at intervals |
*Actual capacities can vary by specific model or options. Always confirm in your tractor’s manual.
Electrical System
The AGCO ST40 tractor’s electrical system is built for steady performance and reliability. With practical features like a robust alternator and a strong battery, you get consistent power for starting and operating key components.
Ground Type (Negative / Positive)
The AGCO ST40 uses a negative ground electrical system. This means the negative terminal of the battery is connected to the chassis, which is the standard for most modern tractors.
A negative ground system reduces electrical noise and the risk of corrosion at electrical contacts. You will find it easier to locate compatible parts and accessories for maintenance or upgrades.
This setup helps you get clear and dependable performance from all electrical components, from the starter to lights and instrument panels. When working on your tractor, always disconnect the negative battery cable first to avoid short circuits.
If you install new equipment, check that it matches this ground type. Using the wrong ground type can lead to malfunction and possible damage to your electrical system.
Alternator / Charging System
Your AGCO ST40 is equipped with an alternator that forms the core of its charging system. The alternator replaces the older generator systems for improved efficiency.
It converts engine power into electricity, charging the battery and running electrical equipment while the engine is running. This system ensures the battery remains at the proper voltage and ready for starting.
It supports essential devices like headlamps, dash gauges, electric PTOs, and the starter motor. The alternator’s voltage regulator manages the supply to avoid overcharging or undercharging the battery.
Proper alternator function is vital because a weak or failed alternator will cause the battery to drain quickly. Warning signs include dimming lights or a battery warning indicator.
Regularly inspect the alternator belt tension and connections to maintain good performance.
Charging Output (Amps)
The alternator in the AGCO ST40 has a charging output of 40 amps. This current output is enough for the tractor’s electrical needs and keeps the battery charged even under load.
With 40 amps available, you can confidently use lights, signals, and electrical accessories without worrying about depleting the battery. A higher amp output provides reserve capacity, which is important when running several systems at once.
If you decide to add high-draw accessories, like extra lighting or electronic controls, you should ensure the combined load does not exceed the alternator’s maximum current. Too much demand can lead to charging problems.
Always refer to your owner’s manual when upgrading electrical components.
Battery Voltage
The AGCO ST40 uses a 12-volt battery system, which is standard for compact tractors of its size and power class. A 12-volt battery delivers enough voltage to start the engine even in cold weather and powers all of the tractor’s electrical systems.
Most electrical accessories and replacement parts are made for 12-volt systems, making repairs and upgrades easy. This voltage is also compatible with most mobile charging equipment and battery chargers designed for farm use.
Never substitute a battery of a different voltage, as it can harm the starter, alternator, and onboard electronics. For best results, always replace your battery with a quality 12-volt model that matches the correct size and rating for your AGCO ST40.
Battery CCA Rating
The battery installed on the AGCO ST40 is rated at 622 cold cranking amps (CCA). CCA refers to the battery’s ability to supply starting power at low temperatures, which is vital for starting a diesel or gasoline tractor engine under tough conditions.
A 622 CCA rating ensures reliable starts in winter or after long periods of inactivity. When the temperature drops, the battery’s power can fall, but a higher CCA helps maintain dependable starter performance.
Always select a battery with a CCA equal to or greater than 622 for your ST40. Lower ratings may result in slow cranking, hard starts, or failure to start the engine.
Regular checks and maintenance will keep your battery at its best.
| Feature | Details | Importance |
|---|---|---|
| Ground Type | Negative (chassis ground) | Standard in most tractors, safer and reduces corrosion |
| Alternator / System | Alternator-based charging | Powers all electric systems and charges the battery |
| Charging Output (Amps) | 40 amps | Supports all standard and most auxiliary electrical loads |
| Battery Voltage | 12 volts | Standard, powers starter and accessories |
| Battery CCA Rating | 622 CCA | Ensures reliable starting in cold and tough conditions |
Total Cost of Ownership Metrics
When you look at the AGCO ST40 tractor, several cost factors stand out. You should consider both regular expenses and long-term values to make informed ownership choices.
| Metric | Key Details |
|---|---|
| Service Intervals | 50 hrs (engine oil), 250 hrs (hydraulic), |
| 500 hrs (full inspection) | |
| Annual Maintenance Cost | $500–$900 (parts, fluid, minor repairs) |
| Depreciation Curve | 7%–10% per year (first 5 years), slows after |
| Fuel Consumption @ Rated Load | 5.5–6.0 L/hr |
Recommended Service Intervals
You should follow a consistent maintenance schedule to keep your AGCO ST40 in good condition. Engine oil and filter changes are recommended every 50 operating hours.
This helps protect engine parts and gives stable performance. Replace the hydraulic fluid and filters every 250 hours.
This prevents buildup and helps keep hydraulic systems running smoothly. Inspect coolant and drive belts every 100 hours for wear or leaks.
A full-service inspection of all major systems should happen every 500 hours. This includes brakes, electrical, and steering parts.
Following these intervals can keep repair costs down and extend the tractor’s life.
Estimated Annual Maintenance Cost
Annual maintenance costs vary depending on how often and how hard you use the tractor. For regular use on a small or medium farm, you can expect costs between $500 and $900 per year.
This covers oil, filters, fluids, and small repairs. If you have higher usage or need to replace larger parts, costs can rise.
Budgeting for basic upkeep helps avoid expensive fixes later. Buying quality replacement parts may seem costly, but it often pays off over time by lowering breakdown risks.
Labor costs may go up if you must use a dealer or service shop instead of doing the work yourself. Keeping good records of each maintenance step helps track spending and spot issues early.
Depreciation Curve (% Per Year)
The depreciation rate of the AGCO ST40 depends on its condition, hours of use, and market trends. For the first five years, expect the tractor’s value to drop by about 7% to 10% per year.
Good care may help you keep depreciation at the lower end of that range. After roughly five years, the annual depreciation usually slows, often falling below 5% per year if the machine is well maintained.
As the tractor gets older, most value loss has already happened, and used prices are more stable. Higher resale value comes with clear maintenance records and lower machine hours.
Major repairs or worn-out parts can lower resale value faster than normal wear.
Fuel Consumption @ Rated Load (L hr⁻¹)
At its rated 40 hp output and about 2600 RPM, the AGCO ST40 uses between 5.5 and 6.0 liters of diesel per hour under full load. Actual numbers can change based on field conditions, attachments, and work type.
Lighter tasks, such as idling or transport, will use less fuel—sometimes 3.5 to 4.5 L/hr. Heavier tilling and nonstop use stay closer to the upper range.
Keeping your engine tuned, tires inflated, and filters clean helps control fuel use. Tracking fuel usage can help you plan jobs and manage operating costs.