AGCO ST22A Tractor 22 hp Specifications, Features, and Performance Overview
Production & Identification
You can track the AGCO ST22A easily with the right details. This section covers who made it, its series, production time, and how to find your tractor’s serial number.
| Feature/Detail | Information |
|---|---|
| Manufacturer / Brand | AGCO (Allis-Gleaner Corporation) |
| Model Number / Series | ST22A, ST-A Series |
| Factory of Manufacture | Iseki, Japan |
| Years Produced | 2003–2008 |
| Original List Price (Launch Year) | Approx. $10,500 (USD, 2003) |
| Serial-Number Location | On frame, below operator’s seat, right side |
Manufacturer / Brand
The AGCO ST22A tractor is made by AGCO Corporation. AGCO stands for Allis-Gleaner Corporation, a well-known company in the farm equipment industry based in the United States.
For the ST22A, AGCO worked closely with Iseki, a trusted Japanese manufacturer. Iseki supplied the main components, like the diesel engine and much of the tractor assembly.
The AGCO branding and orange-gray color scheme are distinctive. You can identify an authentic ST22A by looking for the AGCO nameplate and traditional AGCO colors on the hood and chassis.
Model Number / Series
The model number for this tractor is ST22A. It belongs to the ST-A Series, a line of sub-compact tractors created for versatility and ease of use.
The ST-A Series was produced with small farms, estates, and landscaping in mind. The “22” in the name indicates approximately 22 horsepower, making it one of the more powerful models in this sub-compact segment.
The ST22A is part of the AGCO ST Series, which includes several other models designed with similar engineering but different power levels. Each model in the series has its own features, attachments, and capabilities.
If you see “ST22A” on the frame, owner’s manual, or ID plate, you know you’re dealing with this particular model. This code is also important when ordering parts or checking compatibility with certain implements.
Factory of Manufacture
The AGCO ST22A tractor was assembled by Iseki in Japan. Iseki is one of Japan’s largest makers of small tractors and diesel engines.
AGCO used their expertise in compact design and high-efficiency engines for the ST22A. The tractors were built to AGCO specifications, then shipped to North America for sale under the AGCO badge.
Japanese manufacturing is known for its precision and quality control. The Iseki partnership meant that each ST22A was built with careful attention to detail.
Parts such as the 3-cylinder, liquid-cooled diesel engine and hydrostatic transmission were produced at Iseki’s dedicated tractor factories. A “Made in Japan” label is often found on the data plate or stamped onto the frame, confirming Japanese origin.
Years Produced
The AGCO ST22A was produced from 2003 to 2008. Production began in 2003 as part of a push by AGCO to supply a new line of modern, fuel-efficient sub-compact tractors to North America.
These years covered the ST-A Series as a whole, with the ST22A positioned as the mid-range model for both newcomers and experienced tractor users. AGCO ended its ST-A Series in 2008, shifting towards newer models and different engine emissions standards.
If you own a ST22A, you can be certain your tractor was built within this five-year window. This helps with dating and verifying tractors for repairs, value, and official records.
Knowing these years is important for parts compatibility. Later AGCO compact tractors are different in design.
Original List Price (Launch Year)
When the AGCO ST22A was launched in 2003, its original list price was about $10,500 USD. This price placed it among the more affordable sub-compact tractors with similar horsepower during that period.
Detailed pricing could vary by dealer, location, and optional attachments like loaders, mid-mount mowers, or snowblowers included in the sale. AGCO priced the ST22A to compete directly against similar John Deere, Kubota, and New Holland models.
Its price was sometimes higher with advanced features, but the standard package was economical for homeowners and small-acreage farmers. Used ST22As can often be found for much less, but knowing the original price gives you a good reference when buying or selling a used model today.
Serial-Number Location
You can find the AGCO ST22A’s serial number on the main frame, directly below the operator’s seat and near the right side. The number is usually stamped on a metal plate or engraved directly into the metal.
You might need to raise the seat to see it clearly, especially if there’s dirt or wear from years of use. Always use the serial number to verify the tractor’s identity when buying, selling, or ordering replacement parts.
The number is also useful for registering your machine with AGCO or checking the build date. If you have the owner’s manual, it should show the exact location with a diagram.
Checking the serial number ensures you get the right parts and maintain accurate service records.
Engine Specifications
The AGCO ST22A tractor uses a compact diesel engine with a reputation for reliability. You get 22.5 horsepower, a liquid-cooled system, and efficient fuel use that suits light to medium tractor work.
Engine Make & Model
You will find an Iseki-made engine powering the AGCO ST22A. Iseki is a respected Japanese manufacturer that’s well known for its small diesel engines.
The specific engine used in this model is a 1.1-liter, 3-cylinder design. This engine setup gives you consistent performance in daily operations.
It is built for durability and steady power output, which reduces the need for frequent maintenance. The Iseki engine brings both reliability and efficiency to your work.
Fuel Type & Emissions Tier
Your AGCO ST22A uses diesel fuel. Diesel engines typically offer better fuel economy and more torque compared to gas engines of similar size.
For tractors made in the early 2000s like this one, emissions standards are not as strict as more recent models. The ST22A likely meets U.S. non-road emissions standards from that time, but it does not meet the latest Tier 4 Final requirements.
If you want a model with advanced emission controls, you may need a newer tractor.
Cylinders / Displacement
The engine in your ST22A has 3 cylinders. They’re arranged in line (inline 3-cylinder), which is a common setup for compact tractors in this power range.
Total displacement is 68.5 cubic inches or 1.1 liters. The bore and stroke measure 3.08 inches by 3.07 inches (78 mm x 78 mm).
This balance between displacement and cylinder size helps provide smooth operation and good fuel efficiency.
Rated Horsepower (Gross & Net)
The gross engine horsepower is rated at 22.5 hp (16.8 kW) at 2600 rpm. This measurement gives you the maximum potential power output without any drivetrain losses considered.
The PTO (Power Take-Off) horsepower is slightly lower, reported in different sources as 18.5 hp to 19 hp. The gear PTO rating is 19 hp, while the hydrostatic transmission PTO power is 18.5 hp.
This difference reflects the energy lost through the drivetrain.
| Horsepower Type | Value | Notes |
|---|---|---|
| Engine (Gross) | 22.5 hp | At 2600 rpm |
| Gear PTO (claimed) | 19 hp | With gear transmission |
| Hydro PTO (claimed) | 18.5 hp | With hydro transmission |
Peak Torque (Nm @ rpm)
The manufacturer does not widely publish the peak torque value for the AGCO ST22A’s engine in available documentation. With a 1.1L 3-cylinder diesel producing about 22.5 hp, you can expect peak torque to occur at lower engine speeds, which is typical for diesel engines.
Tractors this size often produce torque in the range of 50–60 Nm at around 1600–2200 rpm. This low-end torque helps you carry out tasks like mowing, tilling, and loader work without the engine stalling.
Compression Ratio
This Iseki diesel engine uses a high compression ratio, which is standard for diesel engines. While the exact compression ratio isn’t listed in public manuals, diesel engines in this class commonly use ratios from 17:1 to 19:1.
A higher compression ratio helps the engine achieve better thermal efficiency and torque at lower rpm. You benefit from improved fuel economy and effective cold starting compared to lower compression gasoline engines.
Cooling System & Capacity
Your AGCO ST22A features a liquid-cooling system instead of air-cooling. Liquid cooling uses coolant circulated through the engine to keep temperatures steady, preventing overheating in tough or slow working conditions.
The cooling system offers steady engine temperatures during extended use or in warmer climates. The coolant capacity is not explicitly stated in public sources, but most engines this size use about 4 to 6 quarts (3.8–5.7 liters) of coolant.
Regular checks of coolant levels are important for long engine life.
Engine Specifications Quick Reference Table
| Specification | Detail |
|---|---|
| Engine Make & Model | Iseki 1.1L 3-cyl |
| Fuel Type | Diesel |
| Emissions Tier | Pre-Tier 4 final |
| Number of Cylinders | 3 |
| Displacement | 68.5 cu in (1.1 L) |
| Bore x Stroke | 3.08″ x 3.07″ (78 mm) |
| Gross Horsepower | 22.5 hp @ 2600 rpm |
| PTO Horsepower (Gear/Hydro) | 19 hp / 18.5 hp |
| Peak Torque (est.) | 50–60 Nm @ 1600–2200 rpm |
| Compression Ratio (est.) | 17:1–19:1 |
| Cooling System | Liquid (water-cooled) |
| Coolant Capacity (est.) | 4–6 quarts (3.8–5.7 L) |
Power Take-Off (PTO)
The AGCO ST22A tractor is designed with practical PTO features that support a range of attachments. With both rear and mid-mount PTO options, you get flexibility for different types of work.
| PTO Feature | Specification | Details |
|---|---|---|
| Claimed PTO Horsepower | 18.7 hp @ 2600 rpm | Delivers strong power for most implements |
| PTO Type | Independent (Rear & Mid) | Allows control without stopping the tractor |
| PTO Speeds | Rear: 540 rpm (1.375″), Mid: 2000 rpm | Suits various attachments and tasks |
| Supported PTO Locations | Rear / Mid | Rear for heavy tools, mid for mowers or similar attachments |
Claimed PTO Horsepower
You will get a rated PTO horsepower of 18.7 hp when running at 2600 rpm. This is a typical figure for a 22 hp compact tractor and means the AGCO ST22A can handle a range of attachments, like finish mowers, rotary tillers, and small balers.
PTO horsepower is slightly lower than the engine’s gross power because of the energy lost in the drive system. For your general yard or garden work, this means you have enough power to run most equipment that the tractor is designed for.
When matching implements, always check the tool’s requirements against the PTO horsepower, not just the engine horsepower. This ensures your tractor won’t struggle during operation.
PTO Type (Independent / Live / Economy)
The AGCO ST22A uses an independent PTO system on both the rear and mid-mount PTOs. This allows you to engage or disengage the PTO without stopping the tractor or pressing the clutch.
It’s a handy feature if you often work with mower decks, snowblowers, or other PTO-driven tools. With independent PTO, you can control attachments more easily, especially when changing directions or pausing for obstacles.
You do not lose power to the implement if you are starting, stopping, or changing gears. The independent type is often preferred over live or economy PTOs in compact tractors, due to greater convenience and reliability.
PTO Speeds (540 / 1 000 rpm)
The rear PTO runs at a standard 540 rpm speed, compatible with most small and medium tractor implements. The rear PTO shaft size is 1.375 inches, which is the industry standard for most three-point hitch attachments.
The AGCO ST22A also features a mid-mount PTO with a 2000 rpm speed. This mid PTO is typically used for under-belly mower decks or front-mounted implements like sweepers or snowblowers.
You can switch between the rear and mid PTOs, depending on which attachment you want to use. The setup helps you manage a variety of implements without needing extra equipment or adapters.
Transmission & Drivetrain
The AGCO ST22A is built for smooth operation with its hydrostatic transmission and reliable four-wheel drive. It offers flexible speed control and dependable traction in many situations.
Transmission Type (Syncro, Powershift, CVT, HST)
The AGCO ST22A is equipped with a hydrostatic transmission (HST). This type uses hydraulic fluid to transfer power from the engine to the wheels.
You can change speed and direction instantly with a simple pedal operation. The hydrostatic transmission supports infinite speeds within each range.
This makes it easier for you to maneuver when mowing, tilling, or performing loader work. It also reduces fatigue, since you don’t need to use a clutch or shift levers between gears.
Routine maintenance for HST includes checking and changing hydraulic fluid and filters. Proper care helps keep the system running smoothly and extends its life.
Number of Gears / Ranges
The tractor’s hydrostatic system provides two operating ranges—low and high. Within each range, you have variable speed control through the pedal.
These two ranges allow you to match your speed to the job. Use the low range for tasks that require power, like tilling or loader work.
Switch to high range for driving across fields or transport. There are no fixed “gears” to shift, since the HST changes speed smoothly rather than in steps.
Top Transport Speed
The AGCO ST22A reaches a top transport speed of around 12-15 km/h (about 7-9 mph). Actual speed may depend on the specific tires fitted and terrain conditions.
This speed is suitable for moving the tractor between job sites on a property or driving it along farm roads. Speed controls, including the pedal and range selector, are designed for easy operation.
You can slow down or stop the tractor quickly without complicated controls.
Drive (2WD / 4WD / AWD)
The AGCO ST22A features four-wheel drive (4WD), also known as Mechanical Front Wheel Drive (MFWD). This means both the front and rear wheels are powered at the same time.
Four-wheel drive is especially helpful when you work in muddy fields or on hills. It provides better traction and helps reduce slippage.
You can engage or disengage the 4WD system as needed. When engaged, the tractor is more stable and maintains grip on uneven or soft ground.
Differential-Lock & Final Drives
A differential lock is included to further boost traction when needed. If one wheel slips in mud or on loose soil, you can engage the lock so both rear wheels turn at the same speed.
The final drives are robust, using gears to transmit power from the transmission to the wheels. This setup is designed for durability under heavy workloads.
The combination of differential lock and 4WD allows you to work in more challenging environments and maintain control when traction is limited.
Transmission & Drivetrain Feature Table
| Feature | AGCO ST22A Specification |
|---|---|
| Transmission Type | Hydrostatic (HST), infinite speeds in 2 ranges |
| Number of Ranges | 2 (Low/High) |
| Top Transport Speed | 12-15 km/h (7-9 mph) |
| Drive Type | Four-Wheel Drive (4WD/MFWD) |
| Differential Lock | Yes, rear axle |
| Final Drive | Gear-driven, heavy-duty |
| Speed Control | Foot pedal |
| Clutch Requirement | Not required for speed/direction changes |
| Traction Adjustment | 4WD engage/disengage, differential lock |
Steering & Brakes
The AGCO ST22A tractor uses a reliable steering and brake setup to help you work safely and accurately. These features make it easier to control the tractor and stop smoothly, even during tough tasks.
| Feature | Type/Spec | Main Benefits |
|---|---|---|
| Steering System | Power Steering (Hydrostatic) | Low effort, precise control |
| Turning Radius (with brakes) | Compact (exact numbers vary) | Easy to maneuver in tight spaces |
| Service Brakes | Wet Disc | Consistent stopping, less wear |
| Parking Brake | Mechanical lever | Secure holding on slopes and flat |
Steering System (Hydrostatic / Power-Assisted / Mechanical)
The AGCO ST22A is equipped with a hydrostatic power steering system. This system uses hydraulic pressure to make turning the wheel much easier.
Even when carrying heavy loads or working in tight conditions, you can steer without much effort. Unlike mechanical steering, this setup reduces strain on your arms and wrists.
You can make quick adjustments to your direction with less physical work. Hydrostatic power-assisted steering allows for better control at varying speeds.
This is especially useful when working with front-end loaders or other attachments that add extra weight to the front of the tractor. The power steering helps ensure smooth and accurate operation.
Turning Radius (with brakes)
The turning radius of the AGCO ST22A is compact, allowing you to maneuver through tight spaces like small fields, orchards, and barns. Although the exact turning radius can vary, the combination of power steering and brake-assisted turning makes it easy to change direction sharply.
Using the brakes, you can make even tighter turns by slowing one rear wheel while the other keeps moving. This is useful for making quick turns at row ends or working in confined spaces.
Operators often find this helpful when trimming around obstacles or maneuvering equipment in limited areas. The strong turning ability also reduces ground damage because you can turn without dragging the tires.
Service Brakes (Wet Disc, Dry Drum, etc.)
The AGCO ST22A utilizes wet disc brakes. These brakes run in an oil bath, which helps keep them cool and protected from dirt.
Wet disc brakes need less maintenance than dry drum brakes, and they tend to last much longer under regular use. When you press the brake pedal, the stops are smooth and dependable.
Even after long hours of operation, the brakes provide steady performance, which is important for working safely on slopes or during transport. Wet disc brakes are also quieter than other types, and they can be applied gradually for controlled stops or firmly for quick halts.
This reduces the risk of slipping or skidding, even on wet or loose surfaces.
Parking Brake Type
The parking brake on the AGCO ST22A is a mechanical lever system. You engage it by pulling a lever, locking the brakes in place.
This setup is simple and fast to use, giving you confidence when leaving the tractor parked. A mechanical parking brake holds the tractor securely, whether on a flat surface or a slope.
You don’t have to worry about accidental movement when the machine is stopped. This feature helps prevent rollaways, especially when parked with attached implements or loaded trailers.
You can trust the parking brake to hold the machine during maintenance, transport, or routine stops in the field. It works independently from the service brakes, so you have an added layer of safety whenever you step away from the tractor.
Cab & Operator Station
You will spend a lot of time in the operator station, so it is important to understand the comfort, safety, and features the AGCO ST22A offers. Key features include a rollover protection structure, seat design, temperature control, and the level of noise while operating the machine.
ROPS / Cab Option
The AGCO ST22A comes standard with a Rollover Protective Structure (ROPS). This is an important safety feature that helps protect you if the tractor tips over.
The ROPS is usually a foldable bar that stands behind the seat and can be lowered to fit under low areas like doorways. There is no factory-installed enclosed cab available for the ST22A.
You operate the tractor in an open environment, so it is important to wear suitable clothing for the weather. Some owners add aftermarket canopies for sun and rain protection, but these do not provide full enclosure or safety features of cabs on larger tractors.
Key Points:
- Factory ROPS bar included
- No enclosed cab from the factory
- Aftermarket canopies possible for weather
Climate Control (A/C, Heater, Filter)
The ST22A does not come with built-in air conditioning or heater systems. Since there is no factory cab, there are no ventilation or filtration features.
You are exposed to outside temperatures, dust, and weather. Using the tractor in hot or cold weather means you need to plan ahead.
Wearing appropriate clothing and protective gear is necessary. If you add an aftermarket canopy, it may provide some sun protection, but there is no option for true climate control.
Key Points:
- No air conditioning or heating
- No cab air filter or fan
- Sun or rain protection only possible with canopy
Seat & Suspension
The operator’s seat on the ST22A is a basic, adjustable model. It slides forward and back to fit your leg length.
There is minimal suspension—usually just a spring under the seat to soften bumps. The seat is padded with vinyl, which is easy to clean but can get hot in the sun.
There are no advanced features like air suspension, armrests, or lumbar support. For longer tasks, some owners install aftermarket seats with extra padding or suspension.
Key Points:
- Adjustable seat position
- Basic vinyl seat with simple spring suspension
- Upgradable to aftermarket seats
Noise Level (dB A @ operator ear)
Since the ST22A is an open tractor with no sound insulation or cab, you will notice engine noise while operating it. The noise level at the operator’s ear typically ranges from 80 to 85 dB(A) during use, depending on throttle setting and attachment in use.
This level of noise may cause fatigue over long periods, so wearing hearing protection is recommended. If a canopy is installed, it has little effect on lowering noise.
No cab means no extra barrier to engine sound.
Key Points:
- Open operator station: 80–85 dB(A) at operator ear
- Loud enough to warrant hearing protection
- No cab or sound insulation reduces noise
| Feature | AGCO ST22A Details | Safety/Health Consideration |
|---|---|---|
| ROPS / Cab Option | Foldable ROPS; No factory cab; Canopy optional | Protects in tip-overs; open air |
| Climate Control | No AC/Heater; Exposed to weather; Canopy for minor shade | Dress for weather; sun exposure |
| Seat & Suspension | Basic vinyl seat; adjustable; spring suspension | Basic comfort; aftermarket seat |
| Noise Level (dB A) | 80–85 dB(A); no cab insulation | Hearing protection recommended |
Hydraulics
The AGCO ST22A tractor uses a straightforward hydraulic setup designed for reliability. Its system gives you suitable power for implements and steering, with simple controls and few complications.
| Feature | Specification |
|---|---|
| System Type | Open-center |
| Implement Pump Flow | 15.5 L/min (estimated from 4.1 gal/min) |
| Steering Pump Flow (if separate) | Shared with implement pump |
| Total Combined Flow | 15.5 L/min (estimated) |
| System Pressure | ~138 bar (2000 psi, typical) |
| Remote Valves | Optional, usually 1–2 single or double-acting |
System Type (Open-Center / Closed-Center / PFC)
The AGCO ST22A is equipped with an open-center hydraulic system. In this type of system, the hydraulic fluid flows continuously through the pump and returns to the tank when not in use.
This constant circulation keeps heat low but does not maintain pressure unless a control valve is activated. You get simple controls and easy maintenance with open-center hydraulics.
This system is common on small tractors like the ST22A. It is not as efficient as closed-center systems for running many hydraulic tools at once but works well for loading, lifting, and common implement use.
Open-center hydraulics also reduce repair costs and make troubleshooting easier. This suits most tasks you would do with a compact utility tractor.
Implement Pump Flow (L min⁻¹)
The main hydraulic pump on the AGCO ST22A delivers about 15.5 liters per minute (4.1 gallons per minute) of oil flow. This flow rate supports most compatible attachments such as loaders, rear implements, or small hydraulic tools.
You can expect steady, responsive performance for lifting and operating implements. Matching flow to your attachment needs is important; most compact tractor implements will work within this output.
If you plan to use hydraulic tools that require more flow, check their ratings.
Steering Pump Flow (if separate)
On the AGCO ST22A, the steering and implement hydraulics use the same main pump. There is not a dedicated steering pump.
This design is common for sub-compact and compact tractors. When you use the steering while operating another hydraulic function, both will draw from the same oil supply.
In practical use, steering feels smooth and light under normal loads. Steering will stay manageable even when you lift a loader or operate a rear implement.
If you use both steering and another hydraulic function at once, you may notice a slight decrease in speed or responsiveness.
Total Combined Flow
Because the AGCO ST22A has a single pump for all hydraulics, the total combined hydraulic flow is about 15.5 L/min. This means all functions—steering and implement control—share the same maximum output.
You can operate multiple functions at once without issue, but expect some sharing of flow between tasks. For example, using the loader and steering together will divide available oil flow.
System Pressure (bar / psi)
The hydraulic system in the ST22A reaches a system pressure close to 138 bar (about 2,000 psi). This pressure is a standard value for compact utility tractors in this power class.
Higher system pressure allows more lifting and pulling power at the fingertips of the user. The pressure is enough to drive loader arms, operate small cylinders, and power common attachments.
Check your attachment ratings to confirm they can safely work at this pressure.
Remote Valves (number & type)
The AGCO ST22A typically comes with one or two optional remote valves, either single-acting or double-acting. The valve type controls oil flow direction.
Single-acting valves move an implement one way and rely on gravity or a spring to return. Double-acting valves power movement both ways.
Integrated remote valves allow you to power rear attachments like a log splitter or hydraulic cylinder. Not all ST22A tractors are sold with this feature, so check your model or ask your dealer.
You can add factory or aftermarket remote kits if you want more hydraulic versatility. Double-acting valves will increase the range of attachments you can use.
Three-Point Hitch (3PH)
The AGCO ST22A comes equipped with a rear three-point hitch designed to work with many implements. Its configuration, lift capability, and control systems influence what tasks you can successfully complete on your property.
| Feature | Details |
|---|---|
| Hitch Category | Category I |
| Lift Capacity (at ball ends) | 882 lbs (400 kg) |
| Draft / Position Control | Position control only; no draft control |
| Top-Link Sensing | No |
Hitch Category (1 / 1N / 2 / 3)
The three-point hitch on your AGCO ST22A is rated as Category I. This category is typical for small tractors in the 20-30 horsepower range.
Category I hitches use pins that are ⅞ inch (22 mm) in diameter, and lower link arms spaced about 26 inches (660 mm) apart. Most compact tractor implements, such as box blades, small plows, and finish mowers, are designed for Category I.
Make sure any implement you consider meets Category I specifications to ensure a safe and proper fit.
Lift Capacity @ Ball Ends
The ST22A’s rear 3PH has a rated lift capacity of 882 lbs (400 kg) at the ball ends. This lift rating determines what size and weight of implements you can operate.
For a 22 horsepower tractor, this is enough for many tasks like grading, mowing, or carrying a small rotary cutter. Using heavier or larger implements than what is recommended can reduce safety and may affect tractor stability.
The lift arms reach full capacity at the ball ends, meaning the point where the implement connects directly to the arms. If the implement’s weight is farther away from this point, actual lifting ability will decrease.
Draft / Position Control
Your AGCO ST22A comes with position control on its 3PH. Position control allows you to set the implement height exactly where you want it and keep it steady while in use.
This feature is useful when you need a consistent working depth, such as with a grader blade or mower. The ST22A does not have draft control.
Draft control automatically adjusts the hitch height based on how much resistance the implement meets in the ground. On the ST22A, the lack of draft control means you will need to manually adjust depth if ground conditions change.
Top-Link Sensing (Yes/No)
The AGCO ST22A’s three-point hitch does not have top-link sensing. Top-link sensing is used for advanced draft control systems, where the tension or compression of the top link sends feedback to the tractor to adjust the hitch automatically.
On your ST22A, the top link must be set manually. You will have to check and adjust the top link as needed for each attachment to maintain proper leveling and performance.
Axles & Load Limits
The AGCO ST22A tractor uses durable axle components to handle a range of workloads. Knowing the load capacity and final-drive details is important for safe operation and efficient use.
| Feature | Front-Axle Load (kg) | Rear-Axle Load (kg) | Final-Drive Type |
|---|---|---|---|
| Maximum Capacity | 600-700 (estimate) | 1,200-1,300 | Gear-driven |
| Recommended Operating Range | 0-550 | 0-1,100 | 4WD standard |
| Axle Construction | Solid steel | Heavy-duty steel | Mechanical |
Maximum Front-Axle Load (kg)
The front axle of the AGCO ST22A is designed to handle inputs from steering, loader attachments, and front ballast. Its maximum rated load capacity is estimated at 600 to 700 kg.
You should not exceed this limit to avoid stress cracks and premature wear. If you plan to use a front loader, always factor the loader’s weight and the weight of any carried materials into your calculations.
When operating on uneven terrain or during heavy loader work, keep loads below 550 kg for safety. The axle is made of solid steel, which supports front implements and helps maintain steering control even with moderate front weights.
Maximum Rear-Axle Load (kg)
The rear axle handles most of the tractor’s weight, especially when towing or using rear-mounted implements. For the AGCO ST22A, the rear axle supports up to 1,200–1,300 kg under normal conditions.
When pulling trailers or heavy equipment, check that the combined weight of the tractor, implement, and any cargo does not exceed this rear-axle limit. If you add ballast or use PTO-driven attachments, be careful about weight shifts that might overload the axle.
A heavy-duty construction helps the rear axle cope with lifting and pulling demands. Regular inspection is important; look for signs of axle stress, especially if running near maximum loads.
Final-Drive Type
The AGCO ST22A uses a gear-driven final-drive system. This setup is known for reliability, low maintenance, and efficient power transfer from the transmission to the wheels.
You benefit from consistent traction due to the four-wheel-drive (4WD) configuration, especially important for field work or when operating on soft ground. Mechanical final drives help distribute torque evenly, reducing slippage and wear.
Routine maintenance, like checking for leaks and ensuring proper lubrication, keeps the drive system working smoothly.
Tires & Track Options
Tire selection is an important factor in determining how well the AGCO ST22A handles different surfaces and tasks. This tractor comes with specific tire sizes and several choices to fit the ground conditions on your property.
| Option | Front Tire Size | Rear Tire Size | Features/Notes |
|---|---|---|---|
| Ag (R1) Tires | 6-12 | 9.5-16 | Best grip in loose soil; deep tread |
| Turf (R3) Tires | 24×8.50-12 | 33×12.50-16 | Lower ground impact; good for lawns |
| Industrial (R4) Tires | 23×8.50-12 | 12.4×16 | Balanced traction & durability |
| Optional Duals | Not Factory Available | Not Factory Available | May require aftermarket kits |
| Tracks / Flotation | Not Standard | Not Standard | Third-party options possible |
Standard Front Tire Size (Ag / Turf / Industrial)
You can choose from several front tire types on the ST22A, depending on how you plan to use your tractor.
- Ag (R1) tires are the standard choice for field work and tilling. The most common front Ag tire size is 6-12.
- Turf (R3) tires, sized at 24×8.50-12, are ideal for lawns, golf courses, or areas you want to protect from heavy marks.
- Industrial (R4) tires, at 23×8.50-12, strike a balance between grip and durability.
Front tire choice impacts your steering, turning radius, and the kind of work you can do without damaging sensitive ground.
Standard Rear Tire Size
Rear tires do most of the work in terms of power transfer and flotation. The right rear tire size helps your tractor perform well and keeps it stable.
- Ag (R1) rear tires are usually 9.5-16. These are best for farming or situations needing maximum traction.
- Turf (R3) rear tires are often 33×12.50-16. These provide a wide, flat contact patch to protect your turf from ruts.
- Industrial (R4) rear tires measure about 12.4×16. Industrial tires are designed for jobs that mix on- and off-road use.
Different sizes and treads affect the overall ride smoothness, as well as your ability to work without getting stuck or damaging the ground.
Optional Duals / Tracks / Flotation Kits
The ST22A does not usually come with factory dual wheels, tracks, or flotation kits, but aftermarket solutions are sometimes available.
Dual rear wheels may be possible by mounting kits from third-party suppliers. These help with extra stability and lower ground pressure on soft soils.
Tracks aren’t a regular option, but some owners have modified their tractors using bolt-on track conversion kits. These systems spread the machine’s weight and can improve performance in muddy or sandy areas.
Flotation kits replace standard tires with extra-wide tires for use in wet or soft ground conditions. This can help for specialty uses, but sourcing these kits may require working with tire specialists familiar with AGCO models.
Before fitting any of these optional systems, be sure to check with your dealer about safety, fit, and how changes might affect your warranty. Some options, such as tracks, may need modifications to the tractor frame or fenders.
Dimensions & Weight
The AGCO ST22A tractor is designed for handling tight spaces and a variety of tasks. Its size and weight are tailored for maneuverability and stability.
| Aspect | Specification | Notes |
|---|---|---|
| Wheelbase | 57.1 in (145 cm) | Key for stability and turning radius |
| Overall Length | 97.6 in (247 cm) | Size from front to back |
| Overall Width (Min. Tread) | 45.8 in (116 cm) | Narrow enough for tight spaces |
| Height to ROPS / Cab | 72.4 in (183 cm) | Safe clearance under structures |
| Ground Clearance | 9 in (est.) | Prevents underbody damage |
| Shipping Weight | 1,367 lbs (620 kg) | Weight for transportation |
| Operating Weight | ~1,600 lbs (726 kg) | With fluids, ready to work |
Wheelbase
The wheelbase of the AGCO ST22A is 57.1 inches (145 cm). This measurement is the distance between the center of the front and rear wheels.
A well-designed wheelbase gives you improved balance and helps when navigating turns. For a sub-compact utility tractor, this wheelbase means you have stability without sacrificing nimbleness.
You can maneuver easily in tight barns or fields. The shorter wheelbase also means reduced risk of “scuffing” when you turn sharply.
This size is appropriate for typical landscaping or gardening work. The tractor stays steady on slopes, but it’s short enough to fit into smaller sheds or garages.
When working on uneven ground, wheelbase can affect your overall comfort as well.
Overall Length
The overall length of the AGCO ST22A is 97.6 inches (247 cm) from the front weight bracket (or front axle) to the back of the tractor. This impacts storage, field navigation, and transport on trailers.
Being under 100 inches means you can easily park the tractor in most home garages or sheds. The compact length also makes it practical for narrow rows in gardens, orchards, or greenhouses.
On job sites or farms, you can make tight turns and reverse with minimal space. If you plan to attach implements or trailers, the length gives you enough room behind the axle.
It balances attachments like mowers or loaders, making operation smoother and safer.
Overall Width (Minimum Tread)
The AGCO ST22A has an overall width (minimum tread) of 45.8 inches (116 cm). This refers to the distance across the wheels at their narrowest setting.
A more narrow width helps you get through tight gates and pathways. For most property owners or small farms, this width allows you to move between rows of crops or trees without damaging plants.
If you use the tractor for mowing, the compact width means you can get close to fences, buildings, or landscape features. Adjusting the tread setting (if possible) gives you more flexibility.
At the minimum width, you have easy access to places where larger tractors just can’t fit.
Height To ROPS / Cab
The height of the AGCO ST22A up to the top of the ROPS (Roll-Over Protective Structure) or cab is 72.4 inches (183 cm). This measurement is important when storing your tractor or navigating under low branches and eaves.
A height just over 6 feet means you can enter most standard garages without issue. If you park under a lean-to or shed, this height helps you avoid scrapes or damage to the cab or ROPS.
Low profile makes it easier if you work in orchards or under tree lines. For safety, the ROPS stays well above seat height, protecting you in case of a rollover.
If your work area has lots of low-clearance areas, knowing this height helps you plan routes and prevent accidents.
Ground Clearance
The ground clearance for the AGCO ST22A is about 9 inches. This is the gap between the lowest point of the tractor (usually the transmission housing) and the ground.
With 9 inches of clearance, you avoid most rocks, roots, and debris that could cause underbody damage. When working in fields or uneven terrain, you have less worry about scraping or catching the underside.
This makes the tractor ideal for light field work, mowing, and even clearing snow. For a compact tractor, this is a practical balance: it’s low enough for stability yet high enough for outdoor tasks.
Shipping Weight
The shipping weight of the AGCO ST22A is 1,367 lbs (620 kg). This is the weight of the tractor as it comes from the factory, with no fluids, ballast, or accessories installed.
This light weight keeps shipping costs low and makes loading onto a trailer straightforward. When moving the tractor between sites, the lighter frame is easier for a typical utility trailer or flatbed.
A lower shipping weight can affect how you handle the tractor on slopes or soft ground.
Operating Weight (With Fluids)
The operating weight of the AGCO ST22A is about 1,600 lbs (726 kg) with all necessary fluids, such as fuel, oil, and coolant. This weight may also include a standard operator and possibly basic attachments.
Operating weight is more relevant day-to-day, because you almost never use the tractor dry. With this weight, you get more traction and stability, especially when you add implements or ballast.
A heavier operating weight helps keep the tractor grounded and prevents sliding or losing control in the field. The weight is also distributed to reduce soil compaction, important for gardening and landscaping.
Knowing the operating weight helps when you select a trailer or plan safe transport.
Fuel & Fluids
The AGCO ST22A tractor uses diesel fuel and requires regular oil and fluid checks to maintain strong performance. Knowing each fluid’s capacity and purpose will help you service and operate your tractor more efficiently.
Fuel-Tank Capacity
Your AGCO ST22A has a diesel fuel tank that holds about 5.5 gallons (20.8 liters). This size gives you several hours of operation, depending on the load and tasks.
Make sure to use high-quality diesel fuel to keep the fuel system clean and the engine running smoothly. For best results, check the fuel level before each use.
Never let the tank run too low because this can pull sediment into the fuel system, possibly causing clogs. If you use the tractor often, clean the fuel filter as suggested in your service manual to ensure proper flow.
A clear fuel gauge or sight glass lets you monitor your fuel level at a glance. Refuel the tractor outdoors and avoid overfilling to prevent spills.
DEF-Tank Capacity (If Applicable)
The AGCO ST22A does not use a DEF (Diesel Exhaust Fluid) system. It has a simple emissions design typical of compact tractors in this horsepower range and production year.
Because it operates below Tier 4 emissions standards, you do not have to add or maintain a DEF tank. You do not need to monitor, refill, or service any DEF-related components on this tractor.
This makes fueling and operating the machine easier compared to some larger or newer models. You only need to focus on diesel fuel quality and routine engine maintenance.
Engine Oil Capacity
The engine in the ST22A holds about 3.2 quarts (3.0 liters) of engine oil. It uses a three-cylinder Iseki diesel engine that depends on clean oil for lubrication and cooling.
Oil changes are usually recommended every 100 hours of use, but always check your owner’s manual for specific intervals. Use oil that meets the manufacturer’s specifications, often SAE 15W-40 for most climates.
Remember to replace the oil filter whenever you change the oil. Always check the dipstick before operating, and top off if necessary.
Avoid overfilling to prevent pressure issues or leaks. If you work in especially dusty, cold, or hot environments, check the oil more often.
Hydraulic/Transmission Oil Capacity
The combined hydraulic and transmission oil system in the AGCO ST22A typically holds 4.0 gallons (15 liters). This oil powers both the hydrostatic transmission and the hydraulic lift for implements like loaders or mowers.
You should use a universal tractor fluid that matches the manufacturer’s recommendations for both viscosity and grade. Check the level and clarity regularly with the dipstick or sight glass located near the rear axle.
Change the fluid and filter at the intervals listed in your operator’s manual, usually every 300-400 hours. Low or dirty oil can cause slow, jerky hydraulic performance or transmission issues.
Always park the tractor on level ground and lower implements before checking or filling fluid.
| Fluid/System | Capacity | Key Notes |
|---|---|---|
| Fuel Tank | 5.5 gal (20.8 L) | Use clean diesel; check level before each use |
| DEF Tank | Not Applicable | No DEF system required |
| Engine Oil | 3.2 qt (3.0 L) | Use SAE 15W-40; change oil & filter every 100 hours |
| Hydraulic/Transmission | 4.0 gal (15 L) | Use universal tractor fluid; change every 300-400 hours |
Electrical System
The AGCO ST22A tractor uses a dependable electrical system to start, run, and power its main features. Understanding the details of the ground type, charging system, battery, and electrical output ensures you can maintain and troubleshoot your tractor effectively.
| Feature | Specification | Details |
|---|---|---|
| Ground Type | Negative | Uses negative grounding for safety and compatibility |
| Alternator/Charging System | 12-volt alternator | Maintains battery charge and provides power during operation |
| Charging Output | Approx. 40 Amps | Sufficient for lights, starter, and accessories |
| Battery Voltage | 12 Volts | Standard for most compact tractors |
| Battery CCA Rating | Around 420 CCA | Ensures reliable starts in various temperatures |
Ground Type (Negative / Positive)
The AGCO ST22A features a negative ground electrical system. This is the modern standard for compact and utility tractors.
The negative ground offers you better electrical consistency and is safer for maintenance work. It also makes compatibility with add-ons and electric tools more straightforward.
Almost all tractor accessories and implements are designed to use negative ground systems, so you will have fewer compatibility concerns. You will notice the battery’s negative terminal is connected to the tractor’s frame.
This ensures all metal parts act as a common ground. If you need to replace the battery or run electrical tests, always disconnect the negative cable first for safety.
A negative ground is also less likely to cause corrosion problems at the electrical contacts.
Alternator / Charging System
This tractor relies on a 12-volt alternator charging system. The alternator is responsible for keeping the battery charged while powering all electrical components during operation.
When the engine is running, the alternator generates enough current to support all tractor systems, from headlights to electric PTO clutches. You will find the alternator mounted near the engine and connected to the electrical system by a series of cables and fuses.
If your battery seems weak or fails to keep a charge, check that the alternator belt is tight and the wiring is secure.
Charging Output (Amps)
The charging output for the AGCO ST22A alternator is typically around 40 amps. This output is enough for running all basic systems, including lighting, dashboard electronics, and the starter motor.
If you add accessories that require significant power, like work lights or a cab heater, ensure the total draw does not exceed the alternator’s output. Running many high-powered accessories may reduce system voltage, making starts harder and possibly causing damage to components.
Always check your electric loads if you plan on heavy accessory use.
Battery Voltage
The tractor uses a standard 12-volt lead-acid battery. This voltage supports the starter motor, ignition system, lights, and all other electrical features.
Using 12 volts helps keep parts replacement simple, as it is a common standard for this size tractor. When you check the battery, you should see at least 12.6 volts when fully charged with the engine off.
If voltage falls below 12 volts after charging, the battery may be weak or failing. Always ensure your replacement battery matches the original voltage to avoid system problems.
Battery CCA Rating
Cold Cranking Amps (CCA) is a measure of how much power the battery can supply at 0°F (-18°C). For the AGCO ST22A, the battery typically has a CCA rating of about 420 amps.
This high rating makes sure your tractor starts even in low temperatures. Choosing a battery with the correct or higher CCA helps avoid slow starts in winter and ensures the starter motor gets enough power.
When selecting a replacement battery, match or exceed this CCA specification. This is vital if you live in an area with cold weather, as insufficient CCA can lead to hard starting or failure to start.
Total Cost of Ownership Metrics
When you consider the AGCO ST22A tractor, you need to account for the costs involved in maintenance, depreciation, fuel, and service schedules. These factors determine what you will actually spend beyond the purchase price.
| Metric | Typical Value / Range | Details / Notes |
|---|---|---|
| Service Interval | 50-100 hours (oil/filter), 300 hrs | Oil, filter, hydraulic, and air filter changes |
| Annual Maintenance Cost | $350 – $600 | Includes parts, fluids, filters, general upkeep |
| Depreciation Curve (Per Year %) | 8-15% (first 5 years) | Higher in early years, slows after year 5 |
| Fuel Consumption @ Rated Load | 2.7 – 3.2 liters per hour | Actual rate can vary with type of work |
Recommended Service Intervals
You should change the engine oil and filter on the ST22A every 50 to 100 operating hours. Hydraulic and transmission fluid changes are typically needed every 300 hours.
Air filters require inspection at each oil change. They only need replacement if dirty or damaged.
The tractor’s grease fittings and moving parts should be lubed every 25 to 50 hours. Checking tire pressure, coolant level, and battery condition can prevent long-term problems.
Estimated Annual Maintenance Cost
Expect to spend between $350 and $600 each year for maintenance. This estimate includes oil, fluids, replacement filters, and small parts.
Labor costs add to the total if you use a service shop instead of doing the work yourself. Older tractors or those used often may need extra repairs, such as belts, hoses, or electrical components.
Higher use can increase costs from extra oil changes or unexpected part failures. Setting aside a yearly budget for upkeep helps prevent surprise bills.
Depreciation Curve (% Per Year)
The AGCO ST22A typically loses value at a rate of 8% to 15% per year for the first five years. The highest depreciation happens right after you buy the tractor new.
By the fifth year, you can expect it to have lost about 40% to 60% of its value. After year five, the rate slows, often dropping to 5% to 8% per year.
Clean, well-maintained tractors keep their value better than those with heavy wear or missing records. Keeping service records helps if you decide to sell or trade in your machine.
Fuel Consumption @ Rated Load (L Hr⁻¹)
At rated load, the AGCO ST22A uses about 2.7 to 3.2 liters of diesel per hour.
How much fuel you actually use depends on the job and how heavily you work the tractor.
Light use—like mowing or light towing—usually means fuel use near the lower end of this range.
Operating at full power for tasks like tilling or loader work increases consumption.
Using clean air filters and tuning the engine can also keep fuel use efficient.