AGCO ST52A Tractor 52 hp Overview and Key Features
AGCO ST52A Tractor 52 Hp
The AGCO ST52A is a compact utility tractor known for its 52 horsepower output and solid design features. This model was built for versatility, with strong capabilities for both farm and property work.
| Topic | Details |
|---|---|
| Production Years | 2005–2008 |
| Manufacturer | AGCO Corporation |
| Model Number/Series | ST52A / ST-A Series |
| Factory Location | South Korea |
| Engine Power | 52 hp (gross) |
| PTO Power | 41 hp (at 2600 rpm) |
| Drive Type | Four-wheel drive (4WD) |
| Original List Price | About $25,000–$28,000 (varied by configuration) |
| Serial Number Location | Lower left side of tractor chassis |
Production & Identification
The AGCO ST52A was produced between 2005 and 2008. It belongs to the ST-A series, a line of compact utility tractors designed for small to medium farming jobs and municipal work.
This tractor is easy to identify due to its compact frame, sloped hood, and AGCO’s distinctive orange paint. The four-wheel drive system and robust rear differential lock are signature features.
You will usually find the model number marked on the hood and sides of the tractor’s engine cowl. Each unit came with a stamped serial plate, ensuring accurate identification for service, resale, and parts replacement.
Manufacturer / Brand
AGCO Corporation is the manufacturer of the ST52A. AGCO is an American agricultural equipment company headquartered in Duluth, Georgia.
Since its founding in 1990, AGCO has become a leading global brand in agricultural machinery, supporting brands like Massey Ferguson, Challenger, Fendt, and Valtra. The AGCO brand is known for reliability and practicality.
For the ST52A, the brand emphasized durable construction, ease of maintenance, and compatibility with a range of implements.
Model Number / Series
The model number for this tractor is ST52A. It is part of the ST-A series, which consisted of compact tractors with varying horsepower and options.
The “ST” prefix stands for “Subcompact Tractor,” while “52A” refers to its 52 horsepower engine rating and its place in the model lineup. Other models in the series had different power ratings.
You can find the model number clearly spelled out on the tractor’s hood. This helps differentiate the ST52A from other AGCO models and makes ordering parts or service straightforward.
Factory of Manufacture
AGCO contracted the manufacturing of the ST52A to factories in South Korea. These factories were known for high build quality in compact tractors and were partners with AGCO for several product lines.
The Korean-built design reflects the international partnerships common in the agricultural tractor industry. Many parts used in the ST52A also appear in other brands under licensing agreements.
Assembly lines at these factories focused on quality control, especially for the drivetrain, transmission, and hydraulic components.
Years Produced
AGCO sold the ST52A from 2005 until 2008 as part of its ST-A series launch. Dealers across North America and other markets received these models during this time.
The production window means parts and manuals are still relatively easy to find. Models after 2008 began shifting to newer safety and emissions standards.
If you are looking for a used ST52A today, knowing these years is important for identifying authentic units and for matching compatible parts.
Original List Price (Launch Year)
When first launched, the AGCO ST52A was typically priced between $25,000 and $28,000, depending on options and region. Prices varied if buyers chose extra features such as cabs, loaders, or enhanced hydraulics.
This price positioned the ST52A as a mid-range compact tractor designed for professional use. The original list price can help you judge the value of used models and compare them to competing tractors from similar years.
Serial-Number Location
The serial number for the AGCO ST52A is usually found stamped or riveted on a metal plate. The location is commonly on the lower left side of the tractor chassis, near where the engine and frame meet.
You should check this plate before buying or servicing the tractor. The serial number helps confirm the model year and authenticity.
Having the correct serial number also makes ordering replacement parts faster and more accurate. If the plate is missing or defaced, you can sometimes find the serial number stamped directly into the frame.
Engine Specifications
The AGCO ST52A tractor’s engine is known for its dependable performance, solid build, and efficient power output. This part of the tractor plays a key role in its work output, fuel use, and maintenance needs.
Engine Make & Model
You’ll find that the AGCO ST52A uses an Iseki diesel engine. Iseki is a respected manufacturer, known for producing durable engines for compact and utility tractors.
This specific model is designed for reliable start-ups and consistent functioning during heavy tasks. The engine model is part of Iseki’s 4-cylinder lineup.
It is commonly paired with tractors in the 50 hp class. The robust build and engineering provide the performance you need for plowing, mowing, or loader work.
This engine uses proven technology that is easy to service and maintain.
Fuel Type & Emissions Tier
The engine in your AGCO ST52A runs on diesel fuel. Diesel engines offer better fuel efficiency and higher torque at low speeds compared to gasoline engines.
This tractor’s engine does not use advanced emission reduction systems found on newer models. Its emissions tier meets standards set for older compact tractors, not the latest EPA Tier 4 requirements.
If you are concerned about emissions and regulations, keep in mind this model predates current emission technology.
Cylinders / Displacement
The engine features 4 cylinders. This configuration delivers smoother power and efficiency compared to 2- and 3-cylinder engines.
With 4 cylinders, you benefit from balanced operation and fewer vibrations. The displacement is about 174 cubic inches (2,850 cubic centimeters, or around 2.85 liters).
Displacement is the total volume inside all the cylinders. This size provides enough power for loader, tiller, and mower attachments while maintaining good fuel economy.
Rated Horsepower (Gross & Net)
The AGCO ST52A’s engine offers a gross power output of 52.1 horsepower (about 39 kilowatts). “Gross horsepower” is measured at the engine flywheel before losses from the transmission or other components.
The tractor’s claimed power at the power take-off (PTO) is 41 hp (about 31 kW). This is the useful power available to drive implements like mowers or tillers.
Net horsepower is the power output after subtracting any losses from the tractor’s basic systems. For this model, the net horsepower is not always specified in detail but is slightly less than the gross rating.
Peak Torque (Nm @ Rpm)
Peak torque determines how well your tractor handles tough jobs at low speeds. The Iseki diesel engine produces strong torque at lower rpm, suitable for agricultural applications.
Specific torque ratings in newton-meters (Nm) at rpm can vary by specific engine calibration and market. However, for a 52 hp 4-cylinder diesel at 2,600 rpm, expect peak torque in the range of 145-165 Nm around 1,600-1,800 rpm.
This torque curve lets you work in heavy soil or haul loads without the engine bogging down.
Compression Ratio
Compression ratio is a key factor that influences power, fuel use, and engine knock. Diesel engines have higher compression ratios than gasoline engines, helping with efficiency and cold weather starting.
The Iseki engine in the AGCO ST52A typically has a compression ratio in the 17:1 to 18:1 range. This ratio supports strong combustion and fuel efficiency.
Cooling System & Capacity
The AGCO ST52A uses a liquid cooling system. This type of system uses coolant circulated through the engine, helping it maintain a steady temperature even on hot days or during long work sessions.
Routine checks and maintenance of the coolant system are important. The system capacity usually ranges from 7 to 9 liters (about 1.8-2.4 gallons).
| Specification | Details |
|---|---|
| Engine Make & Model | Iseki, 4-cylinder diesel |
| Fuel Type | Diesel |
| Emissions Tier | Pre-Tier 4 / Non-EPA-compliant |
| Cylinders | 4 |
| Displacement | 174 cu in (2,850 cc / 2.85L) |
| Rated Gross Horsepower | 52.1 hp (39 kW) @ 2,600 rpm |
| PTO Power | 41 hp (31 kW) |
| Peak Torque | ~145–165 Nm @ 1,600–1,800 rpm |
| Compression Ratio | 17:1 – 18:1 |
| Cooling System | Liquid cooled |
| Cooling System Capacity | 7–9 liters (1.8–2.4 gallons) |
Power Take-Off (PTO)
The AGCO ST52A tractor offers a reliable power take-off system designed for versatility. You get a balance of horsepower, PTO operation types, and standard PTO speeds useful for a range of farm tasks.
Claimed PTO Horsepower
You can expect the AGCO ST52A to deliver a claimed PTO horsepower of about 52 hp (38.9 kW). This gives you enough power to run a variety of implements like rotary cutters, tillers, or balers.
The PTO horsepower closely matches the tractor’s gross engine output, helping ensure efficient power delivery to attachments.
A high PTO rating lets you use larger or more demanding attachments without overloading the tractor. For routine farm work, this power level is suitable for most standard implements on the market.
PTO Type (Independent / Live / Economy)
The ST52A uses an independent rear PTO system. This means you can turn the PTO on and off without stopping the tractor or disengaging the transmission.
Independent PTO provides flexibility and makes operating tools safer and more convenient. You do not need to use the clutch to control the PTO—they work separately from the tractor’s drive system.
This is especially helpful when you need to start or stop a mower or similar tool while still driving the tractor. With this type of PTO, your workflow becomes smoother, and it is easier to avoid damaging equipment or stalling.
It is different from live or economy PTOs, where operation can be linked to the clutch or offer reduced speeds for lighter tasks.
PTO Speeds (540 / 1 000 Rpm)
You get a rear PTO speed of 540 rpm on the AGCO ST52A. This is the most common PTO speed used for farm implements in North America.
Most standard attachments—including mowers, sprayers, and augers—are built for 540 rpm. Since the ST52A uses this industry standard, you will have no trouble finding compatible equipment.
Some tractors offer a secondary 1,000 rpm speed for heavier work, but the ST52A stays with the 540 rpm setup.
| Feature | Specification / Details |
|---|---|
| PTO Horsepower | 52 hp (38.9 kW) (claimed) |
| PTO Type | Independent rear PTO |
| PTO Operation | Can engage/disengage without clutch/stop |
| PTO Speed(s) | 540 rpm (standard) |
| Attachments Supported | Compatible with rotary cutters, tillers, etc |
| PTO Engagement Method | Separate control lever/switch |
Transmission & Drivetrain
The AGCO ST52A tractor is designed to provide strong performance through its reliable transmission and drivetrain system. You will find the details about its transmission type, gear range, transport speed, drive configuration, and differential-lock system clearly outlined below.
Transmission Type (Syncro, Powershift, CVT, HST)
The ST52A comes with an 8×8 synchroshuttle transmission. This means you get eight forward gears and eight reverse gears, which are manually selected in sequence.
Synchroshuttle lets you shift easily between forward and reverse without stopping, making tasks like loader work and direction changes more efficient.
Unlike a powershift or hydrostatic (HST) transmission found on some tractors, the synchroshuttle relies on synchronizers so you don’t need to stop to shift. You use a shuttle lever for quick changes between forward and reverse.
There are no electronic or automatic shifting options on this model. Every gear change uses the clutch.
This type of system is popular for its simplicity and dependability. It requires less maintenance than more complex transmissions and is less expensive to repair if something goes wrong.
For most users, the synchroshuttle setup strikes a balance between ease of use and durability.
Number of Gears / Ranges
You have a total of 16 gears to work with: 8 forward and 8 reverse. The transmission is structured in such a way that you can move through all eight gears in either direction.
This flexibility allows you to match the ground speed to your job, whether you are field cultivating, mowing, or transporting. The gear ratios are spread out to give both slow speeds for detailed work and higher speeds for moving across fields or down the road.
You get a main gear shift lever combined with a range lever for different speed groupings. This makes switching between heavy-duty work and transport simple.
Top Transport Speed
The maximum transport speed of the AGCO ST52A will depend on the specific tires and tire size equipped. You can expect a top speed around 16-19 mph (25-30 km/h).
This lets you move efficiently between work sites or fields without creating excessive wear on the tractor. The transmission’s highest gear is intended for transport, so you will get the best speed when in 8th forward gear and at the rated engine RPM.
The engine is rated at 52 horsepower, which provides enough power to maintain top speed even when towing light loads on level ground. While this speed is not as high as some road tractors or newer utility tractors with powershift or CVT transmissions, it is suitable for most farm and property tasks.
Safety remains a priority, as stability and braking are aligned with the speed range.
Drive (2WD / 4WD / AWD)
The AGCO ST52A is primarily available as a four-wheel drive (4WD) tractor. This 4WD system gives you improved traction on soft ground, hills, or in wet field conditions.
Front and rear differentials distribute engine power to all four wheels, reducing your chances of getting stuck and improving pulling capability. You can engage or disengage the front-wheel drive as needed.
For routine mowing or light work on firm ground, you might choose to run in 2WD to save wear and fuel. For heavier work, rougher terrain, or muddy conditions, you simply engage 4WD.
You do not get an “all-wheel drive” system as found in some equipment, but the selectable 4WD setup covers most needs for this type of tractor.
Differential-Lock & Final Drives
The ST52A is equipped with a mechanical rear differential lock. This feature allows you to lock both rear wheels so they turn together, preventing one wheel from spinning if traction is lost.
It is engaged by a pedal or lever on the operator platform, letting you use it as needed. The final drives deliver power from the differential to the wheels by means of strong gear sets.
These are designed for durability under heavy loads, especially when pulling implements or working on difficult terrain. You should only use the differential lock at low speeds and straight ahead to avoid damage to the transmission or axles.
The combination of a durable final drive and effective locking differential means you can tackle most field conditions without hesitation.
| Feature | ST52A Tractor Specification |
|---|---|
| Transmission Type | 8×8 Synchroshuttle |
| Number of Gears | 8 Forward, 8 Reverse |
| Top Transport Speed | Approx. 16-19 mph (25-30 km/h) |
| Drive System | Selectable 4WD (Four-Wheel Drive) |
| Differential Lock | Mechanical rear, operator-controlled |
| Final Drives | Heavy-duty gear sets, designed for durability |
| Major Operator Advantages | Easy directional changes, strong traction, wide speed selection |
| Ideal Uses | Loader work, field work, transport, tough conditions |
Steering & Brakes
The AGCO ST52A comes equipped with important steering and braking features to improve handling, safety, and comfort. These systems are built for ease of use in the field, making long work days less tiring and more productive.
Steering System (Hydrostatic / Power-Assisted / Mechanical)
You get power steering with the AGCO ST52A. This means you don’t have to use as much force to steer, even if the tractor is carrying a heavy load or making sharp turns.
Power steering uses hydraulic pressure. This pressure helps turn the wheels when you move the steering wheel.
It is smooth and fast, reducing driver fatigue. Mechanical linkages do exist in the system but are backed by the hydraulic power.
With four-wheel drive, the steering stays consistent on different types of ground. You can manuever easily in small spaces.
The hydraulic assist gives you better control in all weather conditions and field types. This setup is better for loader work or tight tasks, as it gives precise handling with little effort.
Turning Radius (With Brakes)
The AGCO ST52A is designed for tight turns. The turning radius with brakes engaged allows you to make sharper pivots, which is especially helpful in small plots or around obstacles.
When you press one brake pedal, it helps the tractor turn even tighter by slowing one rear wheel. This technique, called “brake-assisted turning,” is common in compact tractors.
On level ground, you can expect a tight turning performance. The exact measurement may vary depending on the tire size and if you are using front wheel drive, but it is suitable for vineyard, orchard, and yard work.
This feature saves time and effort when you need to make repeated short turns, work in sheds, or align with rows.
Service Brakes (Wet Disc, Dry Drum, etc.)
The AGCO ST52A uses wet disc brakes. These brakes work by pressing discs together inside a sealed, oil-filled compartment on the rear axle.
Wet disc brakes last longer than dry drum types because the oil keeps them cool and reduces wear. They stay effective even during heavy use or long working hours.
Key advantages:
- Lower maintenance because dust and dirt are kept out.
- Less brake fade, so stopping power stays solid even after repeated use.
- Smooth, gradual braking without sudden jerks.
You get safer stopping, especially if you’re working with heavy equipment. They also work well in wet, muddy, or dirty conditions common on farms.
Parking Brake Type
For holding your tractor steady on slopes or while parked, the ST52A uses a mechanical parking brake. This system usually works by locking the service brake, keeping the tractor from rolling.
The parking brake is easy to apply and release from the operator’s seat. It uses a lever, making it fast to activate.
This mechanical setup is reliable and requires less repair than a hydraulic or electronic system. You can trust it to hold well, even if the tractor is left on an incline.
The parking brake ensures you meet basic safety rules, as it physically locks the brakes in place and doesn’t rely on power or electronics.
| Feature | Description | Benefits |
|---|---|---|
| Steering System | Hydraulic power steering (with mechanical linkages) | Easy, precise control; less effort; reduces fatigue |
| Turning Radius (With Brakes) | Tight turns using brake-assisted steering | Better maneuverability in small spaces |
| Service Brakes | Wet disc brakes inside rear axle with oil bath | Smooth, reliable braking; less maintenance; good in all weather |
| Parking Brake Type | Mechanical, lever-operated | Reliable holding, simple use, dependable on slopes |
Cab & Operator Station
You spend many hours in the operator station, so factors like comfort, visibility, and safety have a direct effect on productivity. A well-designed operator area helps reduce fatigue and increases your ability to work with precision over long periods.
ROPS / Cab Option
The AGCO ST52A comes standard with a ROPS (Roll-Over Protective Structure) to improve safety during use. ROPS helps protect you if the tractor tips or rolls, meeting industry safety requirements.
This is important, especially when working on slopes or uneven terrain. Some models may have a canopy that attaches to the ROPS, offering shade from sunlight.
However, the ST52A typically does not include a fully enclosed cab from the factory. Aftermarket enclosures can be added if more weather protection is needed.
Easy step-up access and wide-open operator areas make it simpler and safer for you to get on and off the tractor. Handholds and non-slip steps are usually present for extra safety.
Controls are close to the seat to minimize reaching.
Climate Control (A/C, Heater, Filter)
The AGCO ST52A usually does not offer a factory-installed, sealed cab with air conditioning or heating. Since you are operating under an open ROPS frame, climate control options are limited.
This means you rely on clothing and basic accessories for weather protection. If you opt for an aftermarket cab enclosure, you could add a simple heater or fan.
Full HVAC systems are rare on this type of tractor, which is typical for utility models of this size and design. Air filtration systems are also not standard, so dust and pollen can be a concern.
You may consider a weather canopy or removable windscreen to help reduce direct sun, wind, or light rain. Always check compatibility before installing any enclosure or accessory on the ROPS.
Seat & Suspension
You get an adjustable vinyl seat that provides some comfort for daily tasks. The seat usually moves forward and back to fit different operators’ heights.
Standard suspension options focus on basic mechanical springs to absorb shocks and bumps from driving or field work. Armrests may be optional or not included, and extra padding is limited compared to larger tractors with deluxe cabs.
Some users upgrade to an aftermarket seat with improved cushioning or better suspension for longer work periods. The seat’s swivel is usually limited, but control levers are within easy reach.
A seat belt is provided for use with the ROPS structure, which is critical for safety. Keeping your seat adjusted for your body size helps you stay comfortable while operating.
Noise Level (dB A @ Operator Ear)
The AGCO ST52A, with its open operator platform and diesel engine, produces moderate engine noise levels. Typical noise ranges between 80 and 90 dB A at the operator’s ear under full load.
Without an enclosed cab, there is no insulation from engine and transmission noise. Extended use at higher noise levels can cause hearing fatigue, so hearing protection is strongly recommended.
Using earplugs or earmuffs can make working more comfortable during long days. Noise levels can vary depending on engine speed, attachment use, and maintenance condition.
Always check the exhaust system for leaks, as repairs can help reduce sound levels.
| Feature | Standard/Available | Key Points |
|---|---|---|
| ROPS / Cab | Standard ROPS; Cab optional | ROPS provides roll-over safety; canopy and enclosures are aftermarket options. |
| Climate Control | Not standard | No factory A/C or heater; basic weather protection requires accessories. |
| Seat & Suspension | Adjustable vinyl seat | Basic comfort; mechanical spring suspension; seat belt for safety; upgrades possible |
| Noise Level | 80-90 dB A (approx.) | Open design means higher operator noise levels; hearing protection advised |
Hydraulics
The AGCO ST52A tractor features a hydraulic system designed to handle a range of agricultural implements and attachments. This section provides detailed technical information about the tractor’s hydraulic system, including configuration, flow rates, pressure, and remote valve functionality.
System Type (Open-Center / Closed-Center / PFC)
The AGCO ST52A uses an open-center hydraulic system. In this setup, hydraulic fluid flows continuously through the system when no implements are being used.
This design is common in compact and utility tractors, making it simple and reliable for everyday farm tasks. With an open-center system, you can expect straightforward maintenance and fewer complex components.
However, the flow to implements is shared, so using multiple hydraulic functions simultaneously may cause a slight drop in performance for each. Open-center systems are generally less expensive to repair and maintain than closed-center or pressure-flow compensated (PFC) systems.
They are well-suited for tasks that do not require high flow rates or extremely precise hydraulic response.
Implement Pump Flow (L Min⁻¹)
The implement pump flow on the AGCO ST52A is approximately 47.3 liters per minute (12.5–12.6 gallons per minute). This is the total amount of hydraulic fluid the system delivers to implements, such as loaders and rear attachments.
A flow rate of 47.3 L/min is enough for common agricultural implements. It provides smooth and steady operation for tasks like lifting, lowering, and angling implements.
Operators will notice responsive hydraulic action with most basic tools. Having a reliable flow rate means you can connect a wide range of attachments without experiencing significant performance drops.
This flow capacity is in line with industry standards for 50-horsepower class compact tractors.
Steering Pump Flow (If Separate)
The ST52A does not have a dedicated steering pump. Instead, the hydraulic steering system draws from the same open-center circuit used for implements, sharing the available flow.
This arrangement simplifies the tractor’s hydraulic design and keeps the cost of repair lower. There may be slight changes in steering effort when using several hydraulic functions at once, as the flow is split between steering and implement circuits.
In practical terms, you should find steering to be smooth during most conditions. Only during heavy simultaneous use of demanding hydraulic tools might you notice any reduction in steering response.
Total Combined Flow
The total combined flow of the hydraulic system on the AGCO ST52A is about 12.5–12.6 gallons per minute (47.3–47.7 liters per minute), as the implement and steering systems share the same circuit.
This total provides enough capacity for handling typical implement and steering needs in the field.
It can manage moderate multitasking, like running a loader while raising a rear implement.
While you won’t reach the levels of flow found in larger or more advanced tractors, this figure is appropriate for the size and intended duties of the ST52A.
System Pressure (Bar / Psi)
The hydraulic system on the ST52A operates at standard pressures typical for utility tractors of its class.
While the specific value is not listed in all manufacturer publications, most similar tractors use a system pressure in the range of 165–210 bar (about 2,400–3,000 psi).
This pressure is sufficient for lifting, tilting, and powering general farm implements.
It is high enough to ensure practical operation without overstressing hoses and valves.
If you need the exact system pressure for repairs or compatibility, consult the manual or a certified AGCO dealer before connecting very high-demand equipment.
Remote Valves (Number & Type)
The AGCO ST52A offers two or more rear remote valves as optional or standard equipment, depending on how the tractor is configured at purchase.
These remote valves are double-acting, supporting the operation of cylinders in both directions.
Remote valves are important for running hydraulic implements like a rear blade or bale spear.
You can control these remotes from the operator seat, giving you flexibility to switch between tasks quickly.
The availability of double-acting valves means you can run attachments needing both extend and retract functions.
When ordering or servicing the tractor, you may have the ability to add more remote valves if needed.
Hydraulic System Summary Table
| Feature | Specification / Detail |
|---|---|
| System Type | Open-Center |
| Implement Pump Flow | 47.3 L/min (12.5–12.6 gal/min) |
| Steering Pump Flow | Not separate; shared with implement flow |
| Total Combined Flow | 47.3 L/min (12.5–12.6 gal/min) |
| System Pressure | ~165–210 bar (2,400–3,000 psi, estimated) |
| Remote Valves | 2+ rear, double-acting (number depends on configuration) |
Three-Point Hitch (3PH)
The AGCO ST52A’s three-point hitch system is designed for efficiency and reliability when using a wide range of implements.
You can expect strong lift performance, precise control options, and compatibility with many standard agricultural tools.
| Subtopic | Details |
|---|---|
| Hitch Category | Category I |
| Lift Capacity | 3,087 lbs at 24 inches; 3,483 lbs at ball ends |
| Control Type | Position control standard, draft control optional |
| Top-Link Sensing | No |
Hitch Category (1 / 1N / 2 / 3)
Your AGCO ST52A uses a Category I hitch.
This is the most common hitch size for compact and utility tractors in the 40-65 horsepower class.
Category I hitches have lift arms with a pin diameter of 7/8 inch and a spacing of about 26 inches between the lower arms.
With a Category I hitch, you have access to a wide selection of implements.
This includes box blades, rotary tillers, post hole diggers, mowers, and rear blades.
Category I implements are widely available and usually cost less than larger categories, making your tractor more versatile and cost-effective.
Lift Capacity @ Ball Ends
The rear three-point hitch on the AGCO ST52A is rated for a maximum lift capacity of 3,483 lbs (1,579 kg) at the ball ends.
At 24 inches behind the lift point, the capacity is 3,087 lbs (1,400 kg).
This is enough power to lift and carry heavy implements like loaded box blades, soil conditioners, or even small bale spears.
It’s important to pay attention to the rating at the 24-inch point because this reflects real-world use for many common implements.
The AGCO ST52A gives you enough lifting power for most Category I equipment, and you can use implements that sometimes stretch into light Category II use during lighter tasks.
Draft / Position Control
The hitch system features position control as standard, which lets you set the height of the implement precisely.
This is useful if you need your blade or mower to stay at a certain level.
Optional draft control is also available.
Draft control automatically raises or lowers an implement in response to changes in soil, which helps maintain even tillage depth or traction.
You use a lever in the operator’s station to adjust these settings.
With position control, you can repeatedly return to the same height every pass.
The optional draft control is especially helpful for plowing or tilling uneven ground, reducing operator fatigue and producing smoother results without constant manual adjustments.
Top-Link Sensing (Yes/No)
The AGCO ST52A does not include top-link sensing in its three-point hitch system.
Top-link sensing is common on larger, high-horsepower tractors.
Instead, this tractor relies on lower arm sensing for its optional draft control, which is typical for tractors of this size.
Without top-link sensing, draft response may be less precise compared to larger tractors.
However, for most tasks in the ST52A’s power class—like mowing, light cultivation, and hauling—lower link sensing is accurate enough and rarely limits tractor performance.
Top-link sensing is more critical for heavy plowing or deep tillage work typically handled by bigger machines.
Axles & Load Limits
The AGCO ST52A tractor is built for stability and dependable performance.
Understanding exact axle load limits and drive design will help you prevent overloading and get the most out of your tractor.
Maximum Front-Axle Load (Kg)
The maximum front-axle load is important to know so you can avoid putting too much weight on the front end, which can harm steering and cause damage.
For the AGCO ST52A, the front axle is designed to support a substantial load.
This tractor is equipped for various front attachments, but you must always consider the weight of any front loader or ballast.
You should keep the combined weight of front implements, ballast, and any additional loads well below the axle limit to maintain safe operation and avoid premature wear.
The actual maximum load is not listed in published specifications, but with an operating weight around 1,585 kg and a total gross weight near 1,700 kg, the front axle typically manages between 800 kg and 1,000 kg under normal configurations.
Routine maintenance and correct tire inflation can also help distribute load evenly across the front axle.
Maximum Rear-Axle Load (Kg)
Rear-axle capacity determines how much you can safely carry with rear implements or when towing.
This is especially important when using heavy three-point hitch equipment.
The rear axle on the ST52A can support a higher load compared to the front.
The rear lift capacity at 24 inches behind the hitch ends is about 1,400 kg (3,087 lbs).
This figure helps guide your selection of implements and the distribution of total tractor load.
When you add weight such as implements, counterweights, or towed equipment, check that the total does not surpass the safe limit for the rear axle.
Exceeding the axle rating can lead to chassis damage or unsafe driving conditions, especially on uneven or soft ground.
Proper weight distribution front to back enhances traction and stability, especially when navigating slopes or rough fields.
Final-Drive Type
The AGCO ST52A uses an outboard spur gear final drive system on its axles.
This type of setup is proven for durability and simplicity, making it easy to maintain and reliable under load.
Spur gears transfer engine power efficiently to the wheels.
The outboard placement lets you access the gears easily for servicing.
This design also accommodates the strong lift capacities mentioned above.
With a four-wheel drive configuration, the ST52A’s final drive system helps provide consistent traction and power delivery in most field conditions.
Understanding your tractor’s final-drive type is essential for scheduling maintenance and identifying correct replacement parts when needed.
| Category | Details for AGCO ST52A |
|---|---|
| Max Front-Axle Load | Estimated 800-1,000 kg (varies by configuration) |
| Max Rear-Axle Load | 1,400 kg (3,087 lbs) at 24 in (rear lift capacity) |
| Final-Drive Type | Outboard spur gear, 4WD |
| Operating Weight | 1,585 kg to 1,700 kg |
| Best Practices | Distribute loads evenly, maintain tire pressure, avoid exceeding axle capacity |
Tires & Track Options
Tire and track choices have a direct impact on how the AGCO ST52A tractor performs in various conditions.
These options let you adapt your machine for field, turf, or construction work.
Standard Front Tire Size (Ag / Turf / Industrial)
The AGCO ST52A comes equipped with several front tire size options, each built for a specific type of job.
Agricultural (Ag) R1 tires are common for fieldwork.
These usually measure around 8.00-16 and offer deep tread patterns for traction in soil.
You should use Ag tires if you work in crop fields or uneven terrain.
For grounds maintenance or lawn care, you may prefer R3 Turf tires.
These are designed with a shallower tread to protect grass but still provide grip.
Turf tire sizes can include similar widths but offer a wider footprint and less aggressive tread.
Industrial tasks require R4 tires.
These strike a balance, giving you some traction for hard ground while resisting cuts and wearing slowly.
Sizes for front industrial tires can be similar but are generally thicker.
Standard Rear Tire Size
Rear tires do much of the pulling and offer stability.
The ST52A usually comes with Ag R1 tires in the rear, which often measure 13.6-24.
These give you strong traction for heavy implements and plowing.
Turf rear tires are also an option, with a smoother tread that helps prevent damage to lawns.
Turf rear sizes are typically wider like 17.5L-24 to distribute weight.
Industrial R4 rear tires are more robust than Ag or Turf versions.
These can handle rocky ground and hold up against frequent use.
Their size is often 14.9-24 but may vary.
The wide range of sizes and tread patterns allows you to tailor the tractor for your regular tasks.
Optional Duals / Tracks / Flotation Kits
Many operators need extra flotation or traction, especially in wet or loose ground.
You can fit the ST52A with optional dual tires, where a second tire is mounted beside each original tire.
This increases the contact area, spreads the weight, and improves grip.
For exceptional flotation, some owners add flotation kits or wide turf tires.
These are special sets made to distribute the tractor’s weight across a larger surface and minimize soil compaction or turf damage.
Track kits or rubber tracks can also be fitted for specific applications.
Rubber tracks further reduce soil disturbance and deliver strong traction in muddy or uneven fields.
Track conversion is most common in high-demand situations like soft soil or specialty crops.
Tires & Track Options Table
| Option Type | Typical Sizes (Front) | Typical Sizes (Rear) | Best Use Case | Notes |
|---|---|---|---|---|
| Ag (R1) | 8.00-16 | 13.6-24 | Field work, plowing, tillage | Deep tread, best for soft/muddy fields |
| Turf (R3) | 27×8.50-15 | 17.5L-24 | Grass, lawns, landscaping | Wide, less aggressive tread |
| Industrial (R4) | 10.5/80-16 | 14.9-24 | Loader, construction, mixed surface | Thick, wear-resistant |
| Duals | Same as standard | Same as standard | Wet, loose soil, improved traction | Doubles the tire width |
| Flotation Kits | Varies (wide tire/track) | Varies (wide tire/track) | Wet fields, reduced compaction | Widest option, special kits |
| Tracks | Not standard, rubber track kits | Rubber track kits | Extreme flotation, soft soils | Lower soil disturbance, high traction |
Dimensions & Weight
You need accurate information about the AGCO ST52A’s size and weight to decide if it will fit your space and handle your tasks.
Each measurement directly affects handling, transport, and job versatility.
| Specification | Value |
|---|---|
| Wheelbase | 75 in (190 cm) |
| Overall Length | 130 in (330 cm) |
| Overall Width | 65 in (165 cm) |
| Height to ROPS / Cab | 90 in (228 cm) |
| Ground Clearance | Not specified |
| Shipping Weight | 3,582 lbs (1,624 kg) |
| Operating Weight (with fluids) | 3,726 lbs (1,690 kg) |
Wheelbase
The wheelbase of the AGCO ST52A is 75 inches, or about 190 centimeters. The wheelbase is the distance between the front and rear axles.
A longer wheelbase like this one provides more stability, especially when carrying heavy loads or operating on uneven ground. You’ll find it helps reduce the chance of tipping.
The size of the wheelbase also affects turning. The ST52A still offers a tight turning radius for a tractor of its size.
This makes it a practical choice for varied farm layouts.
Overall Length
Overall length is important for transport and storage. The AGCO ST52A measures 130 inches long, which is about 330 centimeters.
This length gives the tractor a solid stance but still fits in many standard sheds. You need to account for attachment lengths, as adding implements can increase how much space the tractor takes up.
The length helps keep the machine stable when towing or lifting heavy equipment. Make sure you have enough room for both the tractor and extra implements.
The straightforward length allows for easier loading onto trailers as well.
Overall Width (Minimum Tread)
The overall width of the ST52A is 65 inches, or 165 centimeters. This width is measured at the minimum tread setting of the wheels.
It determines how easily you can pass through narrow gate openings or between crop rows. A 65-inch width gives balance while still allowing you to get through most standard barn doors.
This width also helps keep the tractor stable during turns and while working on slopes. Your ability to adjust the tread can matter for specific row crops or specialty work.
However, the minimum setting covers most needs for general tasks. Be sure to check your barn entrances against this measurement for a good fit.
Height to ROPS / Cab
The height of the AGCO ST52A to the top of the ROPS (Roll Over Protective Structure) or cab is 90 inches, or 228 centimeters. Height matters for both safety and practical reasons.
Clearance under low ceilings, tree branches, or storage doors must be checked before use. This tractor’s height is typical for its class.
If your property has covered workspaces, make sure the doorways are at least 8 feet high to safely accommodate the tractor. The ROPS provides vital safety protection but does add to the stacked height.
Ground Clearance
Ground clearance affects how well the tractor handles rough or bumpy ground. Higher clearance helps avoid getting stuck or damaging the underside.
Exact clearance for the AGCO ST52A is not commonly listed in manufacturer specs, but it is designed to clear grass, small rocks, and typical farm debris. Most tractors in this category have ground clearances between 12 and 16 inches.
If you’re working over crops, stumps, or uneven terrain, knowing the clearance can prevent unnecessary wear. For general use, the clearance on this model should be enough for most field and yard applications.
Shipping Weight
Shipping weight is the base weight of the tractor without fluids or optional attachments. The AGCO ST52A has a shipping weight of 3,582 pounds, or 1,624 kilograms.
This number matters when you are arranging transportation, such as trailering the tractor from the dealer or moving it between properties. Knowing the shipping weight helps you select the right trailer or truck to avoid overloading.
Weight also affects ground pressure, reducing the chance of rutting in softer soil during delivery. Be aware that adding implements or fluid to the tires will increase the total load you need to move.
Operating Weight (With Fluids)
Operating weight includes all fluids, fuel, and standard equipment loaded on the tractor. For the AGCO ST52A, this weight is about 3,726 pounds, or 1,690 kilograms.
This measurement is higher than shipping weight and is closer to what you’ll experience during normal operation. It gives a more realistic sense of how much pressure the tractor puts on the ground and affects tire traction.
Understanding operating weight is essential for safe towing, using implements, or working on soft soil. It also helps in calculating transport needs if you ever need to move the tractor after filling it with fuel and oil.
Fuel & Fluids
You need reliable information on the fuel and fluid requirements for your AGCO ST52A Tractor. Knowing these details will help you maintain better performance and extend the tractor’s lifespan.
Fuel-Tank Capacity
The AGCO ST52A tractor uses standard diesel fuel. The fuel tank typically holds between 11 and 13 gallons (about 42 to 49 liters).
This allows you to operate for several hours between refills when performing average field tasks. Fuel quality is important for engine health.
Always use clean, fresh diesel to prevent injector and filter issues. The fuel filter—such as part number 3702815M1—should be checked regularly and replaced according to the maintenance schedule or if you notice any performance drops.
The fuel filter is usually a spin-on style, making it easy to change during service. If you see reduced fuel efficiency or hear irregular engine sounds, check both tank levels and the filter for debris or water buildup.
Routine inspection of the fuel system reduces the risk of clogs and contamination problems.
DEF-Tank Capacity (If Applicable)
The ST52A’s engine does not require Diesel Exhaust Fluid (DEF). It meets its emissions requirements without using a separate DEF system.
You do not need to monitor or refill a DEF tank. This simplifies maintenance since you only need to handle diesel fuel for operation.
If you come across fluids near the fuel area, check carefully—sometimes condensation or leaks from the fuel system can look similar to DEF residue, but this tractor does not use DEF.
If you operate newer or larger AGCO models, check their manuals, as some may require DEF. For the ST52A, you can focus only on the standard diesel system.
Engine Oil Capacity
The engine oil system in the AGCO ST52A takes approximately 5.3 quarts (about 5 liters) of oil when changing with a new filter. Use a quality diesel engine oil that matches the manufacturer’s specifications.
Check the oil daily before use, especially in high temperatures or after extended heavy work. Changing the oil and spin-on lube oil filter at regular intervals—usually every 100 hours—is crucial.
Inspect the oil for discoloration or thickening, which can indicate the need for maintenance. The oil filter keeps dirt and wear particles out of your engine.
Always use the recommended spin-on oil filter. Keeping oil levels correct and filters fresh helps your engine last longer and run smoother.
Hydraulic/Transmission Oil Capacity
The hydraulic and transmission systems on the AGCO ST52A are combined and use a shared reservoir. The capacity for this combined system is about 6.6 gallons (25 liters).
Always use the specified universal tractor transmission/hydraulic fluid. Low or dirty hydraulic fluid can cause slow loader movement or gear shifting problems.
Check the fluid level with the dipstick, and top off only with the recommended AGCO-approved oil. Change the hydraulic/transmission fluid and filter—also a spin-on type—according to the service schedule, usually every 400–500 hours.
Look for leaks near hoses, the PTO, and filter area. Signs of water in the oil (milky appearance) mean it is time to drain and refill the system to protect internal parts.
| System | Capacity | Service Interval | Special Notes | Filter Type |
|---|---|---|---|---|
| Fuel Tank | 11–13 gal (42–49 L) | Check daily; filter as needed | Diesel only; replace fuel filter regularly | Spin-on (Fuel) |
| DEF Tank | Not applicable | N/A | No DEF required | None |
| Engine Oil | 5.3 qt (5 L) | 100 hours | Use correct grade oil; change filter | Spin-on (Lube/Oil) |
| Hydraulic/Transmission | 6.6 gal (25 L) | 400–500 hours | Shared reservoir; use universal tractor fluid | Spin-on (Hyd/Trans) |
Tip: Always consult your specific operator’s manual for exact specifications and intervals. Using genuine replacement filters helps maintain reliability.
Electrical System
The AGCO ST52A tractor uses a reliable electrical system to support its engine, lights, and controls. Understanding details like the ground type, alternator output, and battery capacity helps you maintain consistent performance.
Ground Type (Negative / Positive)
The AGCO ST52A tractor uses a negative-ground electrical system. This is the most common type for both tractors and other modern vehicles.
In a negative-ground setup, the negative terminal on the battery connects directly to the chassis. This design makes troubleshooting easier.
Many electrical components are designed to work with negative grounding, so finding compatible parts is simple. Negative-ground systems also offer better corrosion resistance at connections.
If you ever need to replace cables or install new electrical parts, always match the ground as negative. Incorrect grounding can cause severe electrical faults or damage to sensitive electronics.
Alternator / Charging System
You will find a robust alternator system in the AGCO ST52A. The alternator is responsible for supplying power to the battery and all the tractor’s electrical components while the engine runs.
The alternator works by converting engine rotation into electrical energy through electromagnetic induction. On the AGCO ST52A, the alternator typically provides steady charging, especially under normal working conditions.
This ensures all lights, electronic instruments, and control systems function without interruption. Should the alternator fail, the battery will drain quickly, so regular checks are important.
For best performance, keep all alternator connections clean and free of corrosion. This keeps the charging system working efficiently and prevents unexpected electrical problems.
Charging Output (Amps)
The charging output of your ST52A’s alternator usually ranges from 35 to 45 amps. This output allows the alternator to charge the battery rapidly and power accessories like lights, radios, and control modules even under heavy use.
High output is important when you use extra electrical devices. If the output falls below the recommended range, your battery may not charge fully, leading to starting issues and dim lighting.
Testing the alternator’s output with an ammeter can verify it is working at full capacity. When replacing the alternator, always check its rated output.
Using an undersized alternator can cause trouble for the electrical system and lead to repeated battery drain.
Battery Voltage
Your AGCO ST52A uses a 12-volt battery system. This voltage is standard for modern tractors and trucks.
A 12-volt battery is strong enough to start the engine and supply all the electrical needs for accessories and controls. Always ensure the battery maintains at least 12.6 volts when fully charged.
Lower voltage may signal charging issues, battery wear, or faulty connections. Use a voltmeter to check battery voltage during routine maintenance.
A reliable 12-volt system makes it easy to find compatible replacement batteries. Be careful to install the battery with the correct polarity, as reversing it can cause system damage or failure.
Battery CCA Rating
The battery in the AGCO ST52A should be rated for at least 600 cold cranking amps (CCA). CCA measures the battery’s ability to provide power in cold temperatures, which is especially important if you operate your tractor in winter or cold climates.
A higher CCA rating ensures that you can start the engine quickly even on the coldest mornings. If the battery’s CCA is too low, starting becomes difficult or you may even drain the battery completely after several attempts.
When buying a replacement battery, always select one with equal or higher CCA than recommended by the manufacturer. This helps the tractor start easily and run all electronics reliably.
Electrical System Overview Table
| Feature | Specification / Details | Importance / Notes |
|---|---|---|
| Ground Type | Negative Ground | Industry standard, easy maintenance, safer for electronics |
| Alternator/Charging System | Belt-driven alternator | Powers battery & electronics, requires regular inspection |
| Charging Output (Amps) | 35–45 Amps | Supports engine, lights, and accessories |
| Battery Voltage | 12 Volts | Common standard, supports all tractor functions |
| Battery CCA Rating | 600 CCA or more | Ensures reliable starting in all weather conditions |
Total Cost Of Ownership Metrics
Understanding the total cost of owning an AGCO ST52A tractor means looking at maintenance, service, depreciation, and fuel use. Knowing these helps you manage your budget and get realistic expectations for long-term costs.
| Metric | Details |
|---|---|
| Service Intervals | 50–250 hours (oil/filter), 500–1,000 hours (major checks) |
| Annual Maintenance Cost | $1,000–$2,000 (parts, labor, fluids) |
| Depreciation Rate | 10–15% per year (first five years) |
| Fuel Consumption (@ Rated Load) | 10–12 liters/hour (approximate, at 52 hp full load) |
Recommended Service Intervals
It is important to follow a routine service schedule to keep the AGCO ST52A running reliably. Engine oil and filter changes are usually recommended every 100 to 250 operating hours.
Shorter intervals are best in heavy use or dusty conditions. Hydraulic filters and fluids often need changing every 250 to 500 hours.
For the transmission and differential, plan to check and change fluids roughly every 500 hours. Air filters should be inspected every 50 hours and replaced if needed to prevent engine damage.
Regular greasing of joints and linkages should be done every 10–50 hours, depending on usage. Getting the tractor inspected by a professional each year or after every 1,000 hours is recommended to catch early issues.
Estimated Annual Maintenance Cost
Your yearly maintenance costs include oil, filters, fluids, wear items, and labor. For the AGCO ST52A, these costs usually range from $1,000 to $2,000 per year.
This range covers normal use and typical parts replacement but can be higher if major repairs are needed. Most of your expense comes from regular oil and fluid changes, new filters, belts, tires, and greasing supplies.
Labor for more complex checks or repairs adds to your bill, especially if work is done by a dealer. Farmers who do their own routine maintenance can save on labor, but you still need to buy genuine parts and fluids.
Depreciation Curve (% Per Year)
Depreciation affects your long-term investment in the AGCO ST52A. Like most tractors in its class, you can expect a depreciation rate of about 10% to 15% per year during the first five years.
The value drops most quickly in the first two to three years and then slows down. After five years, the tractor tends to stabilize in value if it has relatively low hours and a full service record.
Hard use, high hours, or missed maintenance lower resale value much faster.
Here’s a simple example of how depreciation might look:
| Year | Value Retained (%) |
|---|---|
| 1 | 90 |
| 2 | 80 |
| 3 | 70 |
| 4 | 62 |
| 5 | 55 |
Fuel Consumption @ Rated Load (L Hr⁻¹)
The AGCO ST52A has a 52-horsepower engine. When running at full rated load, you can expect to use about 10 to 12 liters of diesel fuel per hour.
Actual use depends on work type, soil, and implements. Heavy tillage or loader work raises fuel use, while lighter tasks like mowing use less.
Idling for long periods also increases fuel wasted without useful work. Keeping air filters clean and tires properly inflated can improve fuel efficiency.