AGCO ST45 Tractor 44 hp Specifications, Features, and Performance Review

AGCO ST45 Tractor 44 Hp

A red AGCO ST45 tractor with 44 horsepower in a green field

The AGCO ST45 tractor is a compact utility tractor known for its reliable 44 horsepower diesel engine and strong build quality. It has been used for a variety of agricultural and landscaping tasks, making it a favorite among small farmers and property owners.

Subtopic	Details
Production & Identification	Produced in the early 2000s, known for compact frame and 44-hp Iseki diesel engine
Manufacturer / Brand	AGCO Corporation; engine by Iseki
Model Number / Series	ST45; part of ST Series
Factory of Manufacture	Built in Japan by Iseki for AGCO
Years Produced	Approximately 2001–2004
Original List Price	Around $18,000–$20,000 (USD) at launch
Serial-Number Location	Stamped on the right side of the tractor frame, near the front axle

Production & Identification

You can identify the AGCO ST45 by its compact body and distinctive orange and gray color scheme. It was produced mainly in the early 2000s.

The model stands out with a 44.2 horsepower four-cylinder Iseki diesel engine. The tractor falls under the utility class, designed for both heavy landscaping and lighter farm duties.

AGCO’s labeling and correct badging are clear on both sides of the hood, making recognition straightforward. The ST45 typically features 4-wheel drive (4WD/MFWD), hydrostatic steering, and a mechanical or hydrostatic transmission option.

The trademark AGCO style and prominent model branding on the hood provide quick identification at a glance.

Manufacturer / Brand

AGCO Corporation, based in Duluth, Georgia, is the company behind the ST45. AGCO is well known for distributing several brands, including AGCO Allis, White, Deutz-Allis, and Valtra.

The ST45 model was manufactured for AGCO by Iseki, a reputable Japanese tractor company. Iseki serves as both the designer and builder of the ST45’s engine and most of its drivetrain.

AGCO imported and marketed the tractor globally, positioning it within their line-up for small to medium-sized operations.

Model Number / Series

The model number for this tractor is ST45. This number follows the ST-series naming scheme used by AGCO for a range of small tractors.

The ST45 sits between other ST models with lower and higher horsepower, such as the ST35 and ST55. This nomenclature allows you to easily compare the ST45 with other models in the same series.

Each number indicates the power output of the model, with the ST45 referring directly to its approximate engine horsepower. ST Series tractors are designed as versatile, compact utilities targeting tasks that larger tractors may be too cumbersome for.

Factory of Manufacture

The AGCO ST45 was built in Japan at Iseki’s main tractor manufacturing facility. Iseki is a well-known Japanese manufacturer recognized for precision and quality in small and mid-size tractors.

Each ST45 unit shipped from Japan is built to AGCO’s specifications, combining Iseki’s technical expertise with AGCO’s global standards. The facilities are known for their strict quality controls and detailed assembly processes.

Japan’s high-production standards contribute to the tractor’s longevity, low breakdown rates, and consistent performance.

Years Produced

The AGCO ST45 was manufactured from around 2001 to 2004. Production began in the early 2000s to meet growing demand for compact tractors in North America and worldwide.

Availability of the ST45 ended when AGCO updated their model line or changed sourcing agreements. If you find a used ST45 today, the production year will usually fall within this 2001–2004 range.

Original List Price (Launch Year)

The original list price of the AGCO ST45, when new in the early 2000s, was between $18,000 and $20,000 USD. The actual amount could change depending on options, transmission type, or front loader attachment.

For its time, the ST45’s price reflected its imported build quality, advanced diesel engine, and standard features. In comparison, this pricing aligns with the premium compact tractor market.

Serial-Number Location

You will find the AGCO ST45’s serial number stamped on the right-hand side of the frame, near the front axle. This location allows easy access for verification, especially during resale or when sourcing parts.

Looking for the serial number is also crucial when registering the tractor or reviewing service records. The number itself helps identify the production year and confirms authenticity.

Always check the condition of the serial number plate to ensure it is intact and not tampered with, as this information is vital for ownership and parts matching.

Table Summary of Key Information:

Feature	Details
Engine	Iseki 4-cylinder diesel, 44.2 hp
Transmission	Mechanical shuttle or hydrostatic
Drive Type	4WD/MFWD
Model Series	ST Series
Year Range	2001–2004
Manufacturer	AGCO by Iseki, Japan
Serial Number Location	Right side of frame, near front axle
List Price (Launch Year)	$18,000–$20,000 (USD)
Main Use	Compact utility, agriculture, landscaping

Engine Specifications

The AGCO ST45 tractor features a robust diesel engine designed for consistent field performance. Its four-cylinder setup delivers strong horsepower and efficiency for your daily farm needs.

Engine Make & Model

The engine found in the AGCO ST45 is built by Iseki, a trusted name in agricultural engines. The specific model for this tractor is an Iseki E4BG1.

Iseki engines are widely used in compact agricultural machines because of their reliable power delivery and longevity. You can expect parts support and straightforward maintenance procedures, as Iseki engines are well-known for practical design.

The engine’s build quality and manufacturer reputation are both important to keep downtime low and ensure steady operation.

Table: Engine Make & Model

Specification	Details
Engine Manufacturer	Iseki
Engine Model	E4BG1
Country of Origin	Japan

Fuel Type & Emissions Tier

The AGCO ST45 operates on standard diesel fuel. Diesel engines like this give you better torque at lower engine RPM compared to gasoline, improving performance during tough or heavy-duty jobs.

This model was produced before the latest emissions regulations, so it usually does not include complex after-treatment systems like Diesel Particulate Filters (DPF) or Selective Catalytic Reduction (SCR). For many users, this means easier upkeep and lower maintenance costs, although emissions output is higher than on newer Tier 4 models.

Key Points:

Fuel type: Diesel
Emissions Tier: Pre-Tier 4 (some regions may refer to this as Tier 2 or Tier 3)
No DPF or SCR system needed

Cylinders / Displacement

The heart of the tractor’s performance is a four-cylinder engine. Having four cylinders helps with smooth operation and steady power delivery, especially during heavy workloads.

The total engine displacement is 2.2 liters, or roughly 134.1 cubic inches. This size gives a balance between strong pulling power and fuel economy, making it suitable for moderate-to-intensive farm tasks.

Table: Cylinders & Displacement

Specification	Value
Number of Cylinders	4
Total Displacement	2.2 liters (134.1 cubic inches)
Engine Type	Inline, naturally aspirated

Rated Horsepower (Gross & Net)

The AGCO ST45 delivers 44.2 horsepower gross. Gross horsepower is the total engine power measured without accessories.

Net horsepower is measured with the engine as installed in the tractor, so it is slightly lower at 42.4 horsepower. When using the power take-off (PTO), you can expect about 37 horsepower in gear-drive models and 36 horsepower with hydrostatic transmission.

This power rating allows the ST45 to handle a wide range of implements and attachments effectively.

Horsepower Ratings Table

Power Rating	Value
Gross Engine Horsepower	44.2 hp (33.0 kW)
Net Engine Horsepower	42.4 hp (31.6 kW)
PTO Power (Gear)	37 hp (27.6 kW)
PTO Power (Hydrostatic)	36 hp (26.8 kW)

Peak Torque (Nm @ rpm)

Torque measures the twisting force the engine produces, which is important for heavy pulling or tough ground work. The Iseki 2.2L engine in the AGCO ST45 outputs peak torque at a relatively low engine speed.

Exact peak torque specifications in Newton-meters (Nm) are not always published for this model. However, with 44 horsepower at 2,600 RPM and typical diesel engine characteristics, you can expect a peak torque range around 130-140 Nm at 1,600–1,800 RPM.

This means you get good pulling power at moderate engine speeds without stressing the engine.

Summary of Estimated Peak Torque:

Value (Estimated)	Engine RPM
130–140 Nm	~1,600–1,800 RPM

Compression Ratio

Compression ratio affects engine efficiency, fuel economy, and cold weather starting. The Iseki E4BG1 engine used in the AGCO ST45 has a compression ratio typical of naturally aspirated diesel engines.

This ratio is generally in the range of 18:1 to 19:1. Higher compression ratios like this improve combustion efficiency and provide more torque at lower RPM.

Your tractor benefits from this by maintaining good start-up characteristics in cold temperatures and maximizing fuel use in each cycle.

Specification	Value
Compression Ratio	18:1 to 19:1

Cooling System & Capacity

The cooling system on the AGCO ST45 uses liquid coolant circulated by a water pump. This type of system maintains more consistent engine temperatures than air-cooled engines, especially during long workdays or in warm weather.

The cooling capacity for this engine is typically about 6 to 7 liters (1.5 to 1.8 US gallons). Regular checking and filling of the radiator is essential for avoiding overheating.

The radiator, hoses, and pump are all straightforward to access, making maintenance tasks manageable for most users.

Cooling System Details Table

Specification	Value
Cooling System Type	Liquid-cooled (water pump)
Cooling System Capacity	6–7 liters (1.5–1.8 gal)

Comprehensive Engine Specifications Table

Feature	Details
Engine Make	Iseki
Engine Model	E4BG1
Fuel Type	Diesel
Emissions Tier	Pre-Tier 4 (No DPF/SCR)
Cylinders	4
Displacement	2.2L (134.1 cu in)
Gross Horsepower	44.2 hp (33.0 kW)
Net Horsepower	42.4 hp (31.6 kW)
PTO Power (Gear/Hydro)	37 hp / 36 hp
Rated RPM	2,600
Peak Torque (est.)	130–140 Nm @ 1,600–1,800 rpm
Compression Ratio	18:1 – 19:1
Cooling System	Liquid-cooled (water pump)
Cooling Capacity	6–7 liters (1.5–1.8 US gal)

Power Take-Off (PTO)

The AGCO ST45 tractor offers a versatile PTO system for operating a range of implements and attachments. You can take advantage of specific PTO features to match different farming or property tasks.

Feature	Details
Claimed PTO Horsepower	37 hp (27.6 kW)
PTO Type	Independent; Electro-hydraulic wet disc clutch
PTO Speeds	540 rpm (rear), 2000 rpm (mid)

Claimed PTO Horsepower

The PTO horsepower is a critical value because it indicates how much power is available at the power take-off shaft for running equipment. The AGCO ST45 tractor is rated at 37 PTO horsepower.

This rating is slightly lower than the engine horsepower, since some power is lost through the transmission. Your implements, such as mowers, tillers, or balers, rely directly on this PTO power.

When selecting implements, always check their required PTO horsepower and match them against the tractor’s 37 hp rating. Choosing attachments within this power range prevents engine strain and reduces wear.

PTO Type (Independent / Live / Economy)

The AGCO ST45 features an independent PTO system. This means that the PTO can be engaged or disengaged regardless of the tractor’s movement or forward gear.

You control the PTO operation using an electro-hydraulic wet disc clutch. This type of clutch is designed for durability and smooth operation.

An independent PTO increases safety and convenience. You can start or stop attached implements while the tractor stays still or in motion.

There is no economy (low rpm) PTO option on this tractor. All PTO operations run at standard speeds for most typical implements.

PTO Speeds (540 / 1 000 rpm)

This tractor has two PTO speed selections. The rear PTO operates at 540 rpm, which is the most common speed for many implements like rotary mowers, tillers, and post hole diggers.

Additionally, the ST45 offers a mid PTO running at 2000 rpm. The mid PTO is often used for equipment like mid-mount mowers or front-mounted snowblowers.

You can switch between the rear and mid PTO depending on the attachment location and the desired function. All PTO operations are managed by controls that are easy to access from the operator’s seat.

Transmission & Drivetrain

The AGCO ST45 has a mechanical shuttle transmission and a strong drivetrain setup. It’s designed for good control, flexibility, and ease of operation in the field or on the road.

Feature	Details
Transmission Type	Mechanical shuttle
Number of Gears/Ranges	16 forward, 16 reverse
Clutch Size	260 mm dry disc
Top Transport Speed	Typically around 18-20 mph (29-32 km/h)
Drive Type	2WD or 4WD (depending on model)
Differential Lock	Standard, manual engagement
Final Drives	Durable gear final drives

Transmission Type (Syncro, Powershift, CVT, HST)

You get a mechanical shuttle transmission with the AGCO ST45. This setup uses a dry disc clutch that you operate with your foot and a hand lever to shift directions.

Shuttle transmissions like this allow you to quickly switch from forward to reverse without stopping. It’s especially helpful when doing loader work or any job that needs a lot of back-and-forth movement.

A mechanical shuttle is simple and less expensive to service compared to powershift or hydrostatic systems. There’s no high-tech electronics; it’s all mechanical.

Number of Gears / Ranges

This tractor gives you 16 forward and 16 reverse gears. That means you have a lot of choices for matching speed to your job, whether you’re plowing, grading, or driving on roads.

The gears are arranged in multiple ranges, often with 4 gears in 4 ranges. This layout makes each gear change predictable and easy.

More gears help you pick the right speed to get work done efficiently. They also make it easier to save fuel by not over-revving the engine.

Top Transport Speed

The AGCO ST45 can reach about 18 to 20 miles per hour (29-32 km/h) on roads. This top speed is typical for compact utility tractors in this power range.

At maximum speed, you can move between fields or job sites quickly. However, always follow road safety guidelines when transporting equipment.

You can expect smooth gear changes even when going fast, thanks to the mechanical shuttle design and well-matched gear ratios.

Drive (2WD / 4WD / AWD)

You can find the ST45 in both 2-wheel drive and 4-wheel drive versions. The 2WD option gives you a simpler and lighter tractor if you only work on dry, flat ground.

The 4WD model adds front axle drive for better grip and pulling power. It really makes a difference in muddy, hilly, or soft conditions.

If you need more traction for loader work or rough terrain, the 4WD version is the best choice. Switching between modes is usually done with a lever on the operator’s platform.

Differential-Lock & Final Drives

The differential lock on the ST45 is manual. With this feature, you can lock the rear wheels together for extra traction if one wheel starts spinning.

You engage the lock using a foot pedal or lever. This is important for getting out of tough spots like mud or soft ground.

The final drives are strong gear drives that send power from the transmission to the wheels. These are built to last and handle heavy loads.

Steering & Brakes

The AGCO ST45 tractor features a dedicated power steering system and reliable wet disc brakes. Its turning radius and parking brake design help you handle the tractor safely in tight or sloped working areas.

Feature	Type/Detail	Key Benefit
Steering System	Power-assisted (hydrostatic)	Easier, smoother steering control
Turning Radius	Compact, enhanced with brakes	Better maneuverability in small areas
Service Brakes	Wet disc	Consistent performance, low wear
Parking Brake	Mechanical lever (often built into pedals)	Secures tractor when parked

Steering System (Hydrostatic / Power-Assisted / Mechanical)

You get power steering on the AGCO ST45, which is often hydraulic or hydrostatic in design. This system makes turning the wheel almost effortless, even with heavy implements attached or during slow maneuvering.

You won’t have to fight the wheel or deal with jerky movements, which lowers fatigue over long work days. Power-assisted steering also provides more precision.

The wheel responds smoothly, making it easier to keep straight lines in the field or to back up wagons in tight spaces. The system requires regular checks for hydraulic fluid levels, but it needs less maintenance than older mechanical steering options.

Many owners notice improved comfort, especially when driving in rough terrain. If you are used to manual steering, you will find the AGCO ST45 much easier to handle.

Turning Radius (with brakes)

The turning radius is a key spec for working in small plots or barns. With its four-wheel drive and power steering, the AGCO ST45 achieves a tight turning angle.

Engaging the brakes helps you turn even sharper, allowing for precise maneuvers. This feature is helpful when working in orchards, livestock areas, or during loader work.

You can swing the tractor in and out of rows with less backing and filling. Using the brake on the inside wheel (differential braking) reduces the circle size you need to turn.

This setup is easy to learn and important for productivity. A small turning radius also makes transport in trailers and movement around storage areas safer.

Service Brakes (Wet Disc, Dry Drum, etc.)

The service brakes on the AGCO ST45 use a wet disc design. These brakes are sealed and operate in an oil bath, which reduces wear and protects from dust and moisture.

Compared to dry drum brakes, wet disc brakes give you smoother stopping action and longer life. You get reliable brake engagement in all weather, even after working in muddy or wet fields.

The pedal force is light, so you won’t tire out your legs during repeated stops. Consistent braking also improves safety on slopes or carrying heavy loads.

Wet disc brakes require less frequent adjustment and typically last longer than drum or shoe types. Regular checks of brake fluid and the system as a whole ensure reliable stopping every time you use the tractor.

Parking Brake Type

The parking brake on the AGCO ST45 is mechanical and usually engaged by pulling a lever or using a dedicated section of the foot pedals. This locks the brakes in place and stops the tractor from rolling on hills or during extended stops.

You can rely on the parking brake to hold when loading or unloading implements. The mechanism is simple, with minimal parts to fail, and easy to inspect for wear.

There is often an indicator or latch, so you know the brake is fully engaged before leaving your seat. Engage the parking brake whenever you stop on uneven ground or while servicing attachments underneath the tractor.

This system requires occasional adjustment to keep it holding firmly. Always check the parking brake function as part of your regular maintenance routine.

Cab & Operator Station

You interact with the AGCO ST45 Tractor through a practical operator station that focuses on safety, comfort, and usability. Key features include ROPS safety, optional climate systems, a supportive seat, and user-friendly controls.

ROPS / Cab Option

The AGCO ST45 comes standard with a foldable ROPS (Roll-Over Protective Structure), giving you essential rollover protection while operating on uneven or sloped land. The ROPS is designed to meet safety regulations and can be folded down if you need to work in a low-clearance area.

Fully enclosed cab options may not come standard on most models. Instead, most ST45s are open station configurations intended for simplicity and visibility.

Aftermarket cabs or weather canopies are sometimes available, mostly for protection against sun or rain. You get wide, slip-resistant steps and a handrail to make climbing on and off safe.

The platform is flat and open with no obstructive levers near your feet.

Climate Control (A/C, Heater, Filter)

Since the ST45 is usually configured as an open station, standard air conditioning and heating aren’t included. You may be able to add a weather canopy or an aftermarket cab, but these mostly give shade rather than full climate control.

If you install an aftermarket cab, some do offer simple heater units, running off the tractor’s coolant system, for cold weather work. Factory-installed air conditioning is not listed as a typical feature.

Air filtration is basic, relying on open airflow rather than dedicated HVAC filters. For dusty or extremely hot climates, you should look at additional kits or custom cab solutions for better comfort and dust protection.

Seat & Suspension

The standard seat on the AGCO ST45 is a high-back, adjustable suspension seat. It provides lumbar support and can move forwards or backwards to fit different operators.

The seat includes a safety belt for your protection. Seat suspension uses springs or a basic mechanical suspension system, smoothing out the bumps from rough fields.

Swiveling is not a standard feature, but armrests may be included on some models or available as an option. Upholstery is vinyl, designed for easy cleaning.

The seat position gives you clear views of controls and implements.

Noise Level (dB A @ operator ear)

The AGCO ST45’s open station exposes you directly to engine and hydraulic noises. Without an enclosed cab, you can expect typical noise levels between 85–90 dB(A) at the operator’s ear during heavy work.

Using hearing protection is recommended if you operate the machine for long periods, especially at high RPMs. If you install an aftermarket cab, noise can be reduced somewhat but not eliminated entirely.

The engine is designed to run smoothly, but vibration and sound are still noticeable compared to larger tractors with premium cabs.

Operator Station & Cab Features Table

Feature	Standard (Open)	Optional/Aftermarket	Details
ROPS	Foldable ROPS	–	Meets safety standards, folds for clearance
Enclosed Cab	Not standard	Weather canopy, Aftermarket	Aftermarket cabs improve comfort, not factory-built
Climate Control	Not included	Heater possible (aftermarket)	Basic heating only; no factory A/C
Air Filtration	Ambient air	Basic dust screens possible	No full HVAC filtration
Seat	Suspension, high-back	Armrests (option)	Adjustable, easy-clean vinyl, seat belt
Noise Level	85–90 dB(A)	Lower w/ insulated cab	Ear protection recommended for open station

Hydraulics

The AGCO ST45 uses an open-center hydraulic system with reliable pressure and flow to support a range of implements. You get strong, consistent power for loader work and other hydraulic tasks.

System Type (Open-Center / Closed-Center / PFC)

The AGCO ST45 features an open-center hydraulic system. In this setup, hydraulic fluid flows continuously through the system when valves are in the neutral position.

This means you get a simple design that is easy to operate and maintain. Open-center systems like this do not store pressurized oil, but send it freely back to the tank until a control valve is moved.

This makes it cost-effective and reliable for utility tractor needs. Unlike closed-center or pressure-flow compensated (PFC) systems, open-center is less complex and better suited for work that does not require multiple high-demand hydraulic functions at once.

Most jobs such as operating a loader, 3-point hitch, or running simple attachments fit within this system’s limits.

Implement Pump Flow (L min⁻¹)

Implement pump flow measures how much hydraulic fluid the pump can move per minute. The AGCO ST45 comes with a pump that delivers enough flow for medium-sized implements.

While the exact value in liters per minute (L/min) can vary by configuration, you should expect a typical figure in the 30-40 L/min range. This allows for steady operation of hydraulic tools and attachments like loaders, backhoes, or rear-mounted equipment.

You can lift and operate implements without lag or stalling. For most tasks you will not notice any shortage of hydraulic power.

If using multiple hydraulic attachments at once, flow can be split between them, so you may see a slight drop in speed during simultaneous operations.

Steering Pump Flow (if separate)

In some tractors, the steering system uses a completely separate pump from the main implement hydraulics. On the AGCO ST45, both the steering and main hydraulic systems often share the same pump, but may have flow prioritized for steering.

This setup guarantees that steering remains responsive, even when the implement system is under heavy load. You should not experience difficulty steering, even if you are lifting heavy implements or running hydraulics at the same time.

If a separate pump is present in your model, the steering pump typically delivers around 10-15 L/min. This amount is enough for smooth, light steering action in most situations.

Total Combined Flow

Total combined flow is the total output from all hydraulic pumps working together. On the AGCO ST45, the combined flow for both implement and steering hydraulics generally ranges from 30 to 40 L/min.

This total allows you to run implements and steer at the same time without reduced performance. You can use the loader, raise or lower an attachment, and steer the tractor in a tight spot without waiting for the hydraulic system to catch up.

If you add extra remote valves or attachments, the combined flow figure is important for determining if the system can handle your workload.

System Pressure (bar / psi)

System pressure shows how powerful the hydraulic system is. The AGCO ST45 operates at a system pressure of 2275 psi (about 157 bar).

This is a solid figure for a tractor of this size and horsepower. It means you have enough hydraulic force for heavy lifting with loaders, digging with backhoes, or driving powerful hydraulic attachments.

The system is designed to keep pressure at this level to protect hoses, seals, and valves from damage. You should not exceed this maximum pressure or install attachments that require higher pressures than the system provides.

Remote Valves (number & type)

Remote hydraulic valves let you control implements or accessories that need hydraulic power. The AGCO ST45 typically comes with one or two rear remote valves, but the exact number can vary with the tractor’s configuration.

These are usually single-acting or double-acting spool valves. Double-acting valves let you use both directions of cylinder travel, making them versatile for many attachments like loaders, mowers, or tilt cylinders.

If you want to use more hydraulic accessories, you can add extra remotes using aftermarket kits. Check how many hydraulic outlets your model has before planning to use several hydraulic-powered implements at the same time.

Hydraulic Feature	Specification / Details
System Type	Open-Center
Implement Pump Flow	30-40 L/min (varies by configuration)
Steering Pump Flow	~10-15 L/min (if separate)
Total Combined Flow	30-40 L/min
System Pressure	2275 psi (157 bar)
Remote Valves	1-2 rear valves (single/double-acting); expandable

Three-Point Hitch (3PH)

The AGCO ST45 tractor is designed with a rear 3-point hitch that adds a lot of flexibility for common farming jobs. You can attach various tools and equipment for tasks like tilling, mowing, and hauling.

Feature	Detail
Hitch Category	Category 1
Lift Capacity @ Ball Ends	Around 2,200 lbs (varies by year/option)
Draft / Position Control	Position Control (Draft may not be included)
Top-Link Sensing	No

Hitch Category (1 / 1N / 2 / 3)

The AGCO ST45 uses a Category 1 3-point hitch.

This is the most common type for compact tractors in this horsepower range. The hitch fits implements with a pin diameter of 7/8 inch for the lower links and 3/4 inch for the top link.

Many standard Category 1 implements—like rotary cutters, post hole diggers, and box blades—fit without modification. There are some tractors with Category 1N (narrow) hitches, but the ST45 uses the standard width.

Category 1 is often preferred because it is simple, affordable, and most compact tractor implements at stores like Tractor Supply or Agri Supply are designed for this category. You won’t have trouble finding hitch-mounted tools that work with your ST45.

Lift Capacity @ Ball Ends

The lift capacity at the ball ends determines what size and weight implements you can safely use.

On the AGCO ST45, this figure is typically around 2,200 pounds (1,000 kg). This allows you to pick up a 6-foot rotary cutter, box blade, rear blade, or even heavier tools with confidence.

Make sure you check the exact rating in your operator’s manual since small differences may exist by year or options. You can safely operate soil plows, food plot seeders, or sprayers that are within this weight range.

The full lift height of the 3PH lets you raise implements high enough for transport over rough ground.

Draft / Position Control

Your 3-point hitch comes with position control as standard. Position control allows you to set the implement at a consistent height when working, so you get uniform tilling or grading.

The ST45 does not always include draft control. Draft control automatically adjusts the hitch height based on soil resistance but is more common on larger tractors.

With position control, you manually set the operating height, and it stays fixed unless changed. This is suitable for most common jobs like mowing or light tillage.

Top-Link Sensing (Yes/No)

The AGCO ST45 does not have top-link sensing.

Top-link sensing is a feature found mainly on larger or premium tractors. It helps the draft control system adjust the hitch position based on the force sensed through the top link when pulling soil-working implements.

Since the ST45 mainly uses position control, this feature is not included. You can use manual adjustments for your top link to control implement tilt.

Attachments that require complex height changes while working—like some heavy plows—may work better on larger tractors that do include top-link sensing. For most routine jobs, manual top link adjustment is simple, direct, and effective.

Axles & Load Limits

Understanding axle ratings and load limits is key to maintaining the performance and safety of your AGCO ST45 tractor. These factors also affect the tractor’s capability for lifting, towing, and working on difficult terrain.

Subtopic	Specification	Details / Notes
Maximum Front-Axle Load	Not officially specified	Check your operator’s manual for best guidance.
Maximum Rear-Axle Load	Not officially specified	Key to safe implement use and towing.
Final-Drive Type	4×4 MFWD (4WD)	Supports traction and power delivery.

Maximum Front-Axle Load (kg)

The AGCO ST45 is built on a 4×4 MFWD chassis, which means both front and rear axles carry significant loads during operation. There is no officially listed maximum front-axle load published in public manuals or databases.

It is important to avoid overloading the front axle, especially if using front-end loaders or heavy front implements. The weight distribution changes with attachments, and too much weight up front can reduce steering control and increase wear.

For best performance and safety, you should consult the operator’s manual for up-to-date information regarding front-axle capacity. If you operate the tractor with substantial front-mounted equipment, you should also consider using ballast weights for improved stability.

Maximum Rear-Axle Load (kg)

The rear axle of your ST45 handles most of the towing and lifting, especially when using implements hooked to the three-point hitch. Like the front, there is no specific rear-axle load figure available in public sources.

The rear lift at the ends is rated up to 3086 lbs (about 1399 kg), which is a critical number if lifting implements or materials. Overloading beyond this point can damage the axle or lift systems and may void warranties.

Proper weight distribution and hitching are necessary to prevent excessive stress on the axle. When using large implements or trailers, always distribute the weight as evenly as possible and keep within rated lift capacities to protect your equipment.

Final-Drive Type

The ST45 uses a 4WD system known as 4×4 MFWD (Mechanical Front-Wheel Drive). This type of final drive provides power to both the front and rear axles, improving traction in the field or on rough terrain.

A 4WD setup is particularly helpful for tasks such as plowing, tilling, or working in mud and snow. Power is delivered mechanically, which means you get reliable traction and less wheel slip compared to older two-wheel-drive systems.

Routine maintenance, including fluid checks and keeping the driveline clean, will help ensure long service life and consistent performance.

Tires & Track Options

The AGCO ST45 tractor offers flexibility in tire and mobility setups for various conditions and specific farm needs. Your choices will directly affect traction, flotation, and the ability to work on different terrains.

Standard Front Tire Size (Ag / Turf / Industrial)

You can choose between three main front tire types for the AGCO ST45: Agricultural (Ag), Turf, and Industrial tires.

Agricultural tires are designed with deep treads for extra grip in fields and soft soils.
Turf tires have a shallower tread, reducing ground disturbance and making them suitable for lawns and golf courses.
Industrial tires offer a sturdy tread for mixed surfaces and light construction use.

Typical front tire sizes for this model are:

Ag: 8.00-16
Turf: 27×8.50-15
Industrial: 10-16.5

These sizes are chosen for weight distribution and to prevent slipping in tough working conditions. Tire ratings are important—always check the ply rating to ensure enough durability, especially if using a front loader or other attachments frequently.

Standard Rear Tire Size

Rear tire size influences both traction and ride comfort. For the AGCO ST45, the most common rear tire types are the standard agricultural, turf, and industrial, just like the front, to match the front tire design.

Ag tires: 13.6-24
Turf tires: 44×18.00-20
Industrial tires: 16.9-24

Larger, deeper-tread Ag tires provide optimal pull for fieldwork. Turf rears minimize turf damage and work well on delicate grounds.

Industrial rears are rugged for heavier duty and mixed-use environments. Exact tire pressure will depend on the load and use type—follow manufacturer guidance for best results.

Optional Duals / Tracks / Flotation Kits

For added traction or reduced ground compaction, you have several upgrade options for the AGCO ST45. Dual wheels can be installed on the rear axle, doubling the ground contact for tricky soil.

Track kits are occasionally available, replacing the standard wheels with rubber tracks for increased flotation and stability in wet or loose soil. Flotation kits, which often include wide tires or tracks, help reduce soil compaction and are useful for working on sandy or wet terrain.

These options may require additional hardware, such as spacers or mounting brackets, and will impact turning radius and weight distribution. Consider the type of fieldwork you do most often before choosing any upgrades, as these options may not be necessary for lighter or lawn-based tasks.

Tire/Track Type	Front Size Options	Rear Size Options	Best Use	Notes
Agricultural (Ag)	8.00-16	13.6-24	Field/crop work	Deep tread for best traction
Turf	27×8.50-15	44×18.00-20	Lawns, golf courses	Low tread to protect grass
Industrial	10-16.5	16.9-24	Mixed surface/work	Durable, moderate tread
Dual Rear Wheels	–	Adds second tire	Muddy/soft soil	Requires extra spacers/hardware
Tracks/Flotation Kits	Track kit replaces tire	Track kit replaces tire	Wet/sandy fields	Maximum flotation, less compaction

Dimensions & Weight

The AGCO ST45 tractor is designed for stability, strength, and ease of use. Its layout and structure allow for effective performance in different farming conditions, supporting both power and maneuverability.

Specification	Value/Range	Notes
Wheelbase	78.9 in (200 cm)	Provides stability
Overall Length	~12 ft	Includes front weights, if equipped
Overall Width	~5.75 ft (min tread)	Varies with adjustment
Height to ROPS	~8 ft	With Roll-Over Protection System
Ground Clearance	~15 in	Clear under most conditions
Shipping Weight	4,448 lbs (2,018 kg)	Without fluids, fuel, or attachments
Operating Weight	4,448 lbs (2,018 kg)	With standard fluids, no implements

Wheelbase

The AGCO ST45 features a wheelbase of 78.9 inches (200 cm). This measurement is the distance between the front and rear axle centers.

A longer wheelbase provides better stability when you’re operating on uneven ground. With this size, the tractor is less likely to tip forward during heavy front-loader use.

The wheelbase also helps with smoother rides, reducing bounce, especially when traveling at higher speeds. This distance supports strong traction and balance.

It enables you to handle implements more securely, even when pulling or carrying heavier loads.

Overall Length

The AGCO ST45 has an overall length of about 12 feet, including standard front weights but not specialty attachments. This modest size allows easy navigation through tight farm roads and smaller gateways.

A shorter tractor fits into storage spaces more easily but still maintains usability for most field tasks. If you install a loader or other front-mount equipment, you should expect the length to increase.

Accurate length measurements can vary with the specific tires and attachments chosen.

Overall Width (minimum tread)

The minimum outside width of the AGCO ST45, set at the narrowest tread, is about 5.75 feet. This allows you to work in fields planted with narrower rows or navigate between buildings without difficulty.

You can adjust the tread depending on your needs and tire choice, which lets you optimize between stability and narrow access. Minimum tread widths are ideal for row crops or orchard work where spacing is limited.

If you need even more stability on sloped terrain, consider increasing the tread width per your operator’s manual instructions.

Height to ROPS / Cab

The height to the top of the Roll-Over Protection Structure (ROPS) is approximately 8 feet. This height ensures good head clearance in most barn entrances and machinery sheds.

For working under low-hanging branches or tight enclosed spaces, you can often fold the ROPS system down, but always check the operator’s guide before making changes. With a cab installed, the height can increase slightly, so always measure before storing your tractor indoors or transporting on trailers.

Ground Clearance

Ground clearance on the AGCO ST45 is roughly 15 inches. This lets you navigate rough terrain, tall grass, and small obstacles without dragging or causing undercarriage damage.

Higher clearance is important for working in fields with crop residue, uneven soil, or minor ditches. You lose some ground clearance if you use larger implements, which can lower the tractor’s profile.

Shipping Weight

The shipping weight of the ST45 is 4,448 pounds (2,018 kilograms). This refers to the tractor’s base weight without extra fluids, fuel, or loader attachments.

You should use the shipping weight when arranging transport with a trailer or flatbed truck. It lets you calculate safe trailer capacity, tie-down points, and legal limits for road transport.

If you add heavy implements or optional weights, the total weight will increase. Always check your equipment’s maximum load before transporting.

Operating Weight (with fluids)

Operating weight is the mass of the tractor fully assembled with all standard fluids (engine oil, coolant, and a full fuel tank), but without extra attachments. For the AGCO ST45, this is also roughly 4,448 pounds, as specs often list shipping and operating weight the same for base models.

You may increase this weight if you add optional items like front-end loaders, cabs, or extra weights. The operating weight affects fuel use, traction, and how much you can pull or lift safely.

It’s important to know this number when planning for storage, field tasks, or if you’re matching implements and trailers to your tractor.

Fuel & Fluids

Managing your AGCO ST45’s fuel and fluids is essential for reliable operation. Knowing the right capacities and types ensures strong performance and reduces maintenance needs.

Fuel-Tank Capacity

The AGCO ST45 uses diesel fuel, which is standard for tractors in this class. The fuel tank is large enough to give many hours of continuous work between refills.

Generally, the fuel tank on the AGCO ST45 holds about 10.6 gallons (40 liters). This size lets you run the tractor for a whole workday under light to medium usage.

For heavier tasks, fuel consumption goes up, so you may need to refuel more often. Always use clean, high-quality diesel to help the engine run well and last longer.

Keep an eye on the fuel gauge and top up the tank before beginning large jobs. This prevents interruptions and keeps water or dirt from getting into the tank, which could cause engine trouble.

DEF-Tank Capacity (if applicable)

The AGCO ST45 does not use a Diesel Exhaust Fluid (DEF) system. This tractor was designed before DEF became standard on many newer models to help meet emissions rules.

There is no DEF tank or DEF requirement.

Engine Oil Capacity

Engine oil is vital for lubricating moving parts and protecting your engine from wear. For the AGCO ST45, the recommended engine oil capacity is 8.4 quarts (7.9 liters).

Always check your owner’s manual for the correct oil type and change intervals. Use high-quality lube oil that matches manufacturer specs, such as a premium 15W-40 or as listed in your manual.

Change the oil and filter regularly, typically every 100-150 hours of use or as needed under heavy work. Check the dipstick often and top up as needed.

Be sure not to overfill, as this can harm the engine. Also, replace the oil filter at every oil change to keep dirt and debris out of the engine.

Hydraulic/Transmission Oil Capacity

The hydraulic and transmission systems share fluid in many compact tractors like the AGCO ST45. Proper lube is needed to ensure smooth shifting, efficient operation, and reliable hydraulic power for implements.

The AGCO ST45 typically uses about 8.7 gallons (33 liters) of hydraulic/transmission oil. Use a high-quality universal tractor fluid or a type recommended by the manufacturer to prevent wear and protect seals.

Change hydraulic/transmission fluid and filters at regular intervals—check your manual for exact hours, but 300-500 hours is common. Keep an eye out for leaks or low fluid, as this can cause system failures or poor performance when using hydraulic attachments.

Fluid Type	Capacity	Notes
Fuel (Diesel)	10.6 gallons (40 liters)	Use only clean diesel; refill before long jobs.
DEF	Not Applicable	ST45 does not require DEF.
Engine Oil (Lube)	8.4 quarts (7.9 liters)	Use proper spec lube oil, change every 100-150 hours, always change oil filter with oil.
Hydraulic/Transmission	8.7 gallons (33 liters)	Use universal tractor fluid or manufacturer-recommended oil, check and change at listed intervals.

Electrical System

The AGCO ST45 tractor has a reliable electrical system, supporting starting, charging, and operation for field work. Key features include a negative ground setup, a 12-volt battery, a strong alternator, and detailed battery ratings.

Ground Type (Negative / Positive)

The AGCO ST45 uses a negative ground electrical system. Negative ground means that the tractor’s metal frame connects to the negative terminal of the battery.

This is the most common grounding choice in modern tractors and vehicles. A negative ground system helps prevent electrical shorts and corrosion.

It also matches standard equipment and electrical components found in today’s agricultural machinery. For most electrical repairs or when installing new accessories, this simplifies connections.

Alternator / Charging System

The tractor is equipped with an alternator for charging the battery and running electrical systems during operation. An alternator replaces the older generator systems and provides steady power output for the needs of the tractor.

The alternator keeps the battery charged while the engine is running. It also supports the operation of lights, monitoring instruments, and any extra accessories you may use.

Alternators are more efficient than generators and last longer. Regular checks of the drive belt and connections help maintain system reliability.

Charging Output (Amps)

The alternator on the AGCO ST45 provides a charging output of 40 amps. This is a moderate amount of current for a tractor of this size and power.

The 40 amp capacity is suitable for operating factory-installed and moderate aftermarket equipment at the same time. A 40 amp alternator can handle the tractor’s starting demands, headlights, instrument panel, and even additional work lights.

If you add accessories such as a radio, sprayer controls, or extra lighting, this output usually remains sufficient.

Battery Voltage

The battery used is a 12-volt unit, which is standard for modern tractors and vehicles. A 12-volt system is compatible with most replacement parts and battery chargers.

This voltage supports all electrical components, including the starter motor, fuel solenoid, instrument cluster, lights, and optional accessories.

When replacing the battery or servicing the electrical system, you should always use a 12-volt battery to avoid damage or compatibility issues.

Battery CCA Rating

The AGCO ST45 uses a battery with a Cold Cranking Amps (CCA) rating of 622. CCA is important for starting performance, especially in cold weather.

A CCA of 622 ensures the battery delivers enough current to start the 4-cylinder diesel engine even during winter. For the ST45, this rating is above average for this horsepower class.

When buying a replacement battery, always look for at least 622 CCA to match the original performance.

Feature	Specification	Notes
Ground Type	Negative	Standard in most modern tractors, simplifies repairs and compatibility
Alternator / Charging System	Alternator	Replaces generator, offers steady electrical power and better reliability
Charging Output (Amps)	40 Amps	Supports standard features and moderate additional equipment
Battery Voltage	12 Volts	Industry standard, matches most accessories and service tools
Battery CCA Rating	622 CCA	Ensures reliable starting performance, especially in cold weather

Total Cost Of Ownership Metrics

Understanding the total cost of owning an AGCO ST45 tractor requires close attention to maintenance, fuel, depreciation, and scheduling.

Recommended Service Intervals

Regular service is key for keeping your AGCO ST45 reliable and efficient. You should perform basic checks, like oil and filter changes, every 100 hours of use.

Air filter inspection and replacement are recommended every 200 hours. Changing hydraulic fluid and filters is needed every 400 hours.

Front axle and transmission fluid should be changed at 400- to 600-hour intervals. Don’t forget to grease fittings and check tire pressure every 50 hours.

Estimated Annual Maintenance Cost

Maintenance costs vary depending on your tractor’s age, use, and climate. On average, you can expect to spend between $600 and $1,000 per year for standard maintenance.

This includes oil, filters, fluids, belts, and minor parts. Labor costs can add another $200-$400 yearly if you use a dealer or mechanic.

Unexpected repairs—like replacing a water pump, radiator, or clutch—may increase your yearly expenses by $300-$800.

Depreciation Curve (% per year)

The AGCO ST45 typically loses about 10-15% of its value each year in the first 3 years, which slows to 6-8% per year after that.

Value loss depends on total hours, physical condition, and how well you document service history. A well-maintained tractor will depreciate slower and retain higher resale value.

Below is the approximate annual depreciation rate you can expect:

Year 1: 12-15%
Years 2-3: 10-12%
Years 4-6: 6-8%
Years 7+: 4-5%

Fuel Consumption @ Rated Load (L hr⁻¹)

Fuel use is a major part of ownership cost.

The AGCO ST45’s 44 hp diesel engine consumes about 5.0 to 5.5 liters per hour at rated load.

Light-duty work, such as mowing or light tillage, may use only 2.5–3.5 L/hr.

Proper tire inflation, engine tune-ups, and regular air filter cleaning will help you use fuel more efficiently.

Metric	Details	Typical Range/Interval
Service Intervals	Oil/filters: every 100 hrs Air filter: 200 hrs Hydraulic/transmission fluid: 400-600 hrs	50-600 hours
Annual Maintenance Cost	Routine service, minor repairs, and labor	$600–$1,000 (plus $200–$400 labor)
Depreciation Curve	Fastest early depreciation, slows over time	10-15% (yrs 1-3), 6-8% (yrs 4-6), 4-5% (yrs 7+)
Fuel Consumption @ Rated Load	Diesel usage while working at or near max output	5.0–5.5 L/hr (full load); 2.5–3.5 L/hr (light work)