AGCO Allis 8785 Tractor 122 hp Features, Specifications, and Performance Overview

AGCO Allis 8785 Tractor 122 hp

This tractor is well known for its 122 horsepower and reliable performance in row-crop farming. You get clear identification details, brand history, and essential specs to help with evaluation or purchase decisions.

Production & Identification

The AGCO Allis 8785 is a row-crop tractor. It was made mainly for medium to large farms needing reliable horsepower.

Power comes from a 122 hp diesel engine, which is useful for tillage, planting, and pulling heavy implements. You can find options like 2WD and 4WD, as well as cabs with heat and air for comfort.

The tractor includes a partial powershift transmission, multiple hydraulic remotes, and both 540 and 1000 PTO speeds. Features such as a three-point hitch and sturdy chassis make it useful for various tasks.

The tractor’s appearance is similar to other AGCO Allis tractors, with orange and black livery. The model’s distinct number “8785” clearly marks it for easy identification.

Key Specifications:

Feature	Description
Engine Power	122 hp (diesel)
Transmission	Partial powershift
PTO	540/1000 RPM
Drive Options	2WD / 4WD
Hydraulic Remotes	2+ SCVs

Manufacturer / Brand

The AGCO Allis 8785 comes from AGCO, a company formed after the breakup of Allis Chalmers. AGCO built on Allis Chalmers’ reputation by modernizing its equipment lines but keeping many trusted engineering features.

This model reflects a transition from classic Allis Chalmers design to updated AGCO standards seen in the 1990s. You will see both “AGCO” and “Allis” branding, which represents a period when older Allis Chalmers models were being phased out in favor of AGCO Allis tractors.

This makes the 8785 recognizable for farmers familiar with both brands. The AGCO Allis 8785 shows the company’s goal to offer reliable tractors to North American and global markets.

Brand Snapshot:

Brand	Notes
AGCO Allis	Combo of AGCO’s resources & Allis Chalmers legacy
Allis Chalmers	Previous major US tractor manufacturer

Model Number / Series

Your AGCO Allis 8785 is part of the “8700 series.” The “87” in the model refers to the series, while “85” marks its approximate engine power.

This naming makes it simple for you to differentiate this tractor from smaller or larger AGCO Allis models such as the 8765 or 8795. The 8785 model stands out for hitting the 120+ horsepower range, often preferred for heavy row-crop work.

Other tractors in this series share frame and design features, so parts and operator controls are similar across the series. This is helpful if you have experience with other models in this family or need replacement parts.

Series Lineup Example:

Model	Approximate HP	Notable Attributes
8765	100	Smaller, lighter duty
8785	122	Mid-range, versatile
8795	140	Higher HP, heavier work

Factory of Manufacture

The AGCO Allis 8785 was made in Beauvais, France. This factory is known for strict quality control and producing reliable tractors for both European and North American markets.

The location also links the model to Massey Ferguson, since some manufacturing resources were shared at the Beauvais site as AGCO consolidated brands. Tractors built here were shipped worldwide, including the United States and Canada.

You may notice differences in cab features or emissions controls depending on the target market. French manufacturing often means you see high standards in fit, finish, and comfort.

If you are shopping for used equipment, being “Made in France” helps provide some background on design and build quality.

Factory Details:

Location	Notable Facts
Beauvais, France	Site with history in Massey Ferguson and AGCO brands

Years Produced

AGCO Allis produced the 8785 model in the late 1990s, targeting growing needs for higher horsepower row-crop tractors. Production mainly covered the years 1997 through 1998, though some may still have been available into early 1999 depending on dealer inventory.

If you are searching for used models, these tractors will generally be about 25 to 27 years old at this point. The short production run means the 8785 is not the most common model in current used markets but is still supported for parts and service by AGCO.

Knowing the model years helps you estimate wear, replacement parts needs, and resale value.

Year Table:

Year Introduced	Year Ended	Notes
1997	1998	May extend to 1999 with unsold units

Original List Price (Launch Year)

When new, the AGCO Allis 8785 cost about $47,000 for a basic 2WD ROPS (Rollover Protection System) version. If you wanted a cab model, pricing started near $59,000 for 2WD and around $55,500 for a 4WD open station.

These prices are for the 1998 launch year and vary based on dealer-installed options. Additional features like MFWD (mechanical front wheel drive), upgraded hydraulics, a deluxe cab, or air conditioning would increase the final price.

At the time, this tractor competed with models from John Deere, Case IH, and New Holland in both price and features.

Original Price Table:

Version	Launch Price (1998)
2WD ROPS	$47,048
2WD Cab	$59,117
4WD Open	$55,502
4WD Cab	Higher (estimate)

Serial-Number Location

You find the serial number for the AGCO Allis 8785 on a metal plate mounted to the tractor frame. Most commonly, this plate is on the right-hand side, below the cab door or near the engine firewall.

On cab models, look at the entry steps or base of the cab. The serial number is a unique sequence of letters and numbers used for registration, service, and replacement part ordering.

Accurately recording the serial number helps you check production year and verify specifications when buying or selling. Always confirm the number matches paperwork before making any deal.

Guide to Finding Serial Number:

Location Point	Description
Frame Below Cab Door	Main location on both cab/open
Engine Firewall/RH Side	Secondary spot, especially on open station
Entry Steps/Base of Cab	Some models place the plate here

Engine Specifications

The AGCO Allis 8785 tractor features a turbocharged diesel engine known for its reliable performance and fuel efficiency. With a robust design and modern cooling system, it provides power and durability needed for demanding farming tasks.

Engine Make & Model

The AGCO Allis 8785 is equipped with engine options from reputable manufacturers. Most commonly, you will find a SisuDiesel 6.6L 6-cylinder diesel engine powering this model.

Some units are also fitted with the Cummins 5.9L 6-cylinder diesel for certain regions or specific configurations. Both engine options are well-respected for their durability and ease of maintenance.

SisuDiesel engines are recognized for their longevity and straightforward construction, using quality gaskets and components that give you fewer worries about frequent repairs. Cummins engines are popular for their reliability and availability of replacement parts.

Fuel Type & Emissions Tier

This tractor uses diesel fuel only. The turbocharged diesel setup helps you get more power and better torque compared to non-turbo engines.

Diesel is more efficient for heavy-duty applications and is standard in modern tractors. Emissions compliance for the AGCO Allis 8785 meets earlier Tier 1 or pre-Tier 1 standards, since the model was produced before more stringent regulations came into effect.

You may not find advanced aftertreatment systems like DEF or particulate filters in these tractors, so maintenance is simpler. Diesel fuel systems use robust fuel gaskets and filters to handle the high pressures involved, ensuring leak-free operation.

Cylinders / Displacement

The standard engine in the 8785 has 6 cylinders, providing smoother operation compared to 4-cylinder models. The displacement is 6.6 liters (402 cubic inches) for the SisuDiesel engine, with the Cummins option having a slightly smaller 5.9-liter displacement.

The 6-cylinder design offers balanced power delivery and less vibration, which translates to more comfort for you during long work days. The larger displacement also allows for more torque at lower engine speeds, making the tractor easier to use with heavy implements.

Rated Horsepower (Gross & Net)

You get 122 horsepower at the engine, which is the gross rating at the flywheel. PTO-rated horsepower is slightly less due to power loss in the driveline, with published figures around 117 horsepower at rated PTO speed.

Net horsepower values typically fall within a few horsepower of the gross rating. These ratings mean you can run a wide range of implements, including large mowers, balers, and tillage equipment.

Peak Torque (Nm @ rpm)

Peak torque for the SisuDiesel 6.6L engine is typically found in the 540–600 Nm range, depending on tuning and model year. This peak torque is usually reached at engine speeds between 1,500 and 1,800 rpm.

That torque curve gives you powerful pulling ability at lower RPMs, improving efficiency and responsiveness under load. Higher torque at low speeds means less stalling and smoother operation, especially when starting heavy loads or operating in soft soil.

The engine’s turbocharger helps keep torque high even when RPMs drop, which is helpful in tough conditions.

Compression Ratio

The engine uses a compression ratio typical for diesel engines, usually set between 16:1 and 18:1, though the exact value depends on whether you have the SisuDiesel or Cummins engine. The higher compression ratio maximizes efficiency and allows for more thorough combustion of diesel fuel.

This high compression design helps with cold starts and supports the engine in generating its rated torque and horsepower. Quality head gaskets are critical at these compression levels to prevent leaks and ensure long-term reliability, especially when operating the tractor under heavy loads.

Cooling System & Capacity

The AGCO Allis 8785 uses a liquid-cooled system. Coolant circulates through the engine using a pump, passes through the radiator, and uses a thermostat to regulate temperature.

This helps maintain a consistent operating temperature for improved efficiency and longer engine life. The cooling system capacity varies by configuration.

For most 8785 tractors, you will need around 20–25 liters (roughly 5–6.5 gallons) of coolant. The system includes robust hoses and gaskets designed to withstand temperature changes and pressure.

Routine checks of the cooling system, particularly the condition of the thermostat and all gaskets, help prevent overheating and engine damage.

Specification	Details
Engine Make/Model	SisuDiesel 6.6L 6-cyl, Cummins 5.9L 6-cyl
Fuel Type	Diesel
Emissions Tier	Tier 1/Pre-Tier 1 (no DEF/DPF)
Cylinders	6
Displacement	6.6L (402ci; SisuDiesel), 5.9L (Cummins)
Rated Horsepower	122 HP (gross), ~117 HP (PTO)
Peak Torque	540–600 Nm @ 1,500–1,800 rpm
Compression Ratio	16:1–18:1
Cooling System	Liquid-cooled, thermostat-regulated
Coolant Capacity	20–25 L (5–6.5 gal)

Power Take-Off (PTO)

The PTO on the AGCO Allis 8785 is designed for reliability and to handle demanding tasks. It features a strong system, multiple speed options, and an independent operation for convenience and control.

Claimed PTO Horsepower

The AGCO Allis 8785 tractor delivers around 122 engine horsepower, but the claimed PTO horsepower is typically lower due to power loss through the driveline. For this model, the PTO horsepower is generally rated at about 105 HP.

This amount of power is suitable for running large implements such as balers, mowers, choppers, and grain augers. Running tools that require more than the available PTO horsepower can stress the components, including the clutch and separator plate.

It’s important to always match attachments to your tractor’s PTO output to maintain efficiency and avoid breakdowns. Keeping your PTO horsepower within limits also protects critical components.

High strain can wear out your PTO clutch and separator plates faster, leading to more frequent repairs or replacements.

PTO Type (Independent / Live / Economy)

The AGCO Allis 8785 is equipped with an independent PTO. This means you can engage or disengage the PTO without having to stop the tractor or depress the clutch.

This setup gives you more flexibility when using equipment that needs to run while the tractor is stationary or when shifting between forward and reverse. The independent PTO uses a separate clutch system, often involving a clutch separator plate.

This part is key for smooth transitions and helps reduce wear on both the tractor and the attachments. With a well-maintained separator plate, you will notice smoother operation and less need for repairs.

An independent PTO system is especially useful for jobs that require you to stop and start the tractor often. Live or economy PTO options are not standard on this tractor; its design focuses on independence for maximum versatility.

PTO Speeds (540 / 1 000 rpm)

This model offers dual-speed PTO options: 540 rpm and 1,000 rpm. Both speeds are available on the rear PTO, which is useful for switching between different types of implements.

Most standard equipment for smaller jobs uses 540 rpm, while larger or higher-capacity tools need the 1,000 rpm setting. To change between these speeds, you typically adjust a shift lever or collar.

Using the correct PTO speed is important because running at the wrong rpm can cause excessive wear or damage to the tractor, equipment, or even the PTO clutch separator plate. The 1.375-inch shaft is compatible with most attachments for either speed.

The ability to switch between speeds allows you to handle a wider variety of tasks without changing tractors.

PTO Overview Table

Feature	Details
Claimed PTO Horsepower	About 105 HP
PTO Type	Independent (with clutch separator plate)
PTO Engagement	Engaged/disengaged on the move; does not require stopping
PTO Speeds	540 rpm and 1,000 rpm
PTO Shaft Size	1.375 inches
Rear PTO	Standard, independent, dual-speed
Key Components	PTO clutch, separator plate
Common PTO Applications	Balers, mowers, augers, choppers, spreaders

Transmission & Drivetrain

The AGCO Allis 8785 features a robust drivetrain built for efficiency and control under heavy workloads. The tractor’s power delivery, transmission choices, and drive systems help you handle a range of agricultural tasks, from plowing to hauling.

Feature	Details
Transmission Type	Powershift (Partial), Mechanical Shuttle
Number of Gears/Ranges	32 Speeds (Four-speed power shift, multiple ranges)
Top Transport Speed	Approximately 25 mph (varies by market)
Drive Options	2WD, MFWD (Mechanical Front Wheel Drive/4WD)
Differential Lock	Present, manual or automatic (model-dependent)
Final Drives	Heavy-duty, designed for high torque
Clutch Type	Multi-disc, wet clutch system

Transmission Type (Syncro, Powershift, CVT, HST)

You get a partial powershift transmission in the AGCO Allis 8785. This setup lets you shift through several gears under power without clutching for every gear change.

It improves efficiency during tasks that need frequent speed adjustments, such as baling or loader work. The combination of a mechanical shuttle and powershift elements makes gear changes smoother.

Mechanical shuttle allows you to quickly change direction, which is useful if you do loader work or make frequent reversals while operating in tight spaces. With the powershift feature, the tractor needs less operator effort and reduces downtime between speed changes.

This transmission is not a continuously variable (CVT) or hydrostatic (HST) type, but it delivers reliable and predictable control.

Number of Gears / Ranges

The transmission features 32 speeds, giving you a wide choice for field operations or road transport. This is achieved through a four-speed powershift with several ranges, so you have precise control over ground speed and engine power.

The range of gears suits everything from slow, controlled work (like planting) to higher-speed applications (like pulling heavy trailers on the road). Gear selection is straightforward thanks to the shuttle and powershift layout.

This multi-range, multi-gear setup caters to operators who need fine speed adjustments without having to stop frequently.

Top Transport Speed

On the road, the AGCO Allis 8785 can reach up to 25 mph (40 km/h), depending on market specifications and tire setup. This high transport speed is useful if you move between fields that are far apart.

Fast transport reduces time spent traveling and helps keep up with busy schedules. The smooth shifting from the powershift transmission makes it safe to drive at higher speeds.

Make sure to check your local regulations, as top speeds can vary by region. Actual speed may also change based on tire size and load, so always follow safe driving practices.

Drive (2WD / 4WD / AWD)

The tractor is available in both 2WD and MFWD (mechanical front wheel drive, also called 4WD) versions. MFWD improves traction greatly, especially in muddy or soft field conditions.

Choose MFWD if you need to handle heavy implements or uneven terrain. 2WD units are lighter and slightly cheaper.

They may be enough if you mostly work on firm, level ground. However, for most agricultural jobs, MFWD is preferred because of its better pulling power and stability.

The drive system is built to handle extra torque, especially in MFWD models. MFWD (4WD) ensures that you get power to all wheels, reducing wheel slip and providing consistent control.

Differential-Lock & Final Drives

A manual or automatic differential-lock is standard on the AGCO Allis 8785. This feature locks the rear axle to help both wheels turn together, increasing traction in slippery spots.

Use the diff-lock when you notice one wheel spinning without grip. Final drives are heavy-duty, made to handle the high torque that comes from pulling large implements.

They distribute power evenly to the wheels and require little maintenance if you keep them lubricated. The clutch system is usually a multi-disc, wet clutch design.

This style improves heat dissipation and durability. The clutch size and spline count are built for tough, repeated engagement and long service life.

Always follow service intervals for the clutch and drivetrain for best performance and reliability.

Steering & Brakes

The AGCO Allis 8785 tractor uses advanced steering and braking systems to give you better control, safety, and comfort. These components help you manage tight spaces, heavy loads, and changing terrain efficiently.

Feature	Details
Steering System	Hydrostatic/Power-Assisted: Power steering with hydraulic boost
Turning Radius	Tight turning radius; improved by use of brakes
Service Brakes	Hydraulic Wet Disc Brakes: Durable, low wear, high stopping power
Parking Brake Type	Mechanical Parking Brake: Reliable holding in parked position; manual application

Steering System (Hydrostatic / Power-Assisted / Mechanical)

You get a power-assisted, hydrostatic steering system on the AGCO Allis 8785. This means less effort is needed to turn the wheel, even when carrying heavy loads or driving at slow speeds.

The hydraulic system delivers smooth and consistent steering control. It helps you make accurate turns, reduces driver fatigue, and improves your experience in long working hours.

There are no complex levers for steering, just a single steering wheel with hydraulic assist. The design also keeps steering responsive even if the front axle angles change.

If the engine stops, limited manual steering remains.

Turning Radius (With Brakes)

The AGCO Allis 8785 has a tight turning radius for its class. This makes turning in small areas, field ends, or in the barnyard much easier for you.

When you use the brakes during a turn—sometimes called “brake-assisted turning”—the tractor can pivot even sharper. Each brake pedal can be pressed independently, allowing you to increase maneuverability by slowing one rear wheel.

This feature is especially useful when making headland turns or working in narrow rows. The independent brakes give you precise control for smoother turns in close quarters.

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

Your AGCO Allis 8785 uses hydraulic wet disc brakes on the rear axle. Wet disc brakes work inside a sealed oil bath, which keeps them cool and extends their life.

This design provides high stopping power and steadier performance, even during repeated or long braking tasks. Wet disc brakes generally need less maintenance than dry drum brakes.

They resist fading much better when you stop frequently or carry heavy loads. The hydraulic system also ensures even pressure and smooth stops, so you get both safety and comfort.

In the field or on the road, wet disc brakes deliver dependable performance at all speeds. You can expect positive engagement and fast stopping when you need it most.

Parking Brake Type

The AGCO Allis 8785 is fitted with a manual mechanical parking brake. This brake is easy to set using a hand lever, keeping the tractor securely parked, even on hills or slopes.

When you want to lock the tractor in place, you engage the parking brake after stopping. The mechanical linkage physically holds the brakes closed, so there is no worry about hydraulic pressure leaks.

This design means the parking brake remains effective regardless of the environment or temperature. When repairing the parking brake, routine service involves draining oil and removing side plates, but once reassembled, it works reliably for daily use.

Cab & Operator Station

The AGCO Allis 8785 gives you options for the way you want to work, with both open and enclosed operator stations. Inside the cab, attention to comfort, ergonomics, and climate makes a big difference in daily tasks.

Feature	Details
ROPS / Cab Options	Open ROPS or enclosed cab
Climate Control	Air conditioning, heater, fresh air filter
Seat & Suspension	Adjustable, air-ride available on some models
Noise Level	Reduced with cab; dB rating varies, typically moderate
Radio	Installed in cab models for operator convenience

ROPS / Cab Option

You can choose between a ROPS (Rollover Protective Structure) or a fully enclosed cab on the AGCO Allis 8785. The ROPS version is open, giving you fresh air and an unobstructed view, but without the weather protection of a cab.

With the cab model, doors and glass windows shield you from rain, dust, and wind. The cab also keeps you safer by separating you from moving parts and offering added rollover protection.

Sturdy steps and wide doors make it easy to enter and exit. AGCO built these cabs with strong frames and large windows for excellent visibility in all directions.

The inside layout makes it simple to reach controls and see the field, which can boost productivity for long fieldwork days.

Climate Control (A/C, Heater, Filter)

The cab on the AGCO Allis 8785 features a full climate control system. You get air conditioning for hot summer days and a heater for warmth in cold months.

Both are controlled with simple dials within arm’s reach. A built-in air filter helps keep out dust and pollen, improving the air you breathe while working.

The ventilation system allows you to set fan speed and direct airflow where you want it. Sealed doors and windows help the system keep the inside temperature steady.

Clear vents in the cab roof and dashboard mean the air is spread evenly. This lets you stay comfortable and focused, no matter what the weather is like outside.

Seat & Suspension

The operator seat is designed for comfort during long workdays. Most AGCO Allis 8785 tractors come standard with a fully adjustable suspension seat that absorbs bumps and vibrations from rough fields.

You can change the backrest angle, position, and seat height using simple levers. Some models offer optional air-ride seats that adjust automatically for your weight and deliver the smoothest possible ride.

Adjustable armrests add support for your arms during operation. Padding is firm but comfortable to prevent back or leg fatigue.

There’s also plenty of foot space and room to stretch. In cab models, you get a built-in radio in easy reach, so you can listen to music or weather updates as you work.

Noise Level (dB A @ Operator Ear)

Noise control is important for your comfort and hearing protection. In the cab model of the 8785, noise is reduced thanks to sealed doors, insulation, and quieting materials around the engine and transmission.

Noise levels at the operator’s ear are typically lower than with the open ROPS version. While specific decibel ratings vary, most cabs in this power range run in the 75–85 dB(A) range at typical engine speeds.

This makes conversation or listening to the radio possible without shouting. If you use a ROPS model, noise will be higher, so hearing protection is often recommended.

Standard features like rubber floor mats and additional sealing also cut down unwanted sounds. This quieter work environment can make a noticeable difference in fatigue and overall comfort during long days in the field.

Hydraulics

The AGCO Allis 8785 tractor is equipped for a range of hydraulic tasks with a reliable system suited for common implements. It features multiple remote valves, adequate pump flow, and strong pressure for typical field operations.

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

Your AGCO Allis 8785 uses an open-center hydraulic system. In open-center systems, hydraulic fluid flows continuously through the control valves and back to the reservoir when the valves are in neutral.

This design is simple and effective for most farm tasks. Open-center systems are known for easy maintenance and straightforward troubleshooting.

Unlike closed-center systems, there is no pressure in the lines when not in use. This also means the system is less complex and generally less expensive to repair.

You won’t find load-sensing (PFC) features here. The tractor is reliable for typical loader and implement tasks, but not designed for advanced or high-precision hydraulic requirements.

Implement Pump Flow (L min⁻¹)

The implement pump on the 8785 delivers approximately 60–65 liters per minute (L/min). This rate provides steady flow for a variety of hydraulic implements, ensuring consistent lifting, tilting, and other movements.

You will notice that the flow rate is matched to common mid-sized farm equipment, including mowers, loaders, and other attachments. The steady delivery of fluid means smooth actuator operation even with dual or triple remote use.

If your implement requires consistent or higher flow, the 8785’s capacity is usually enough. However, extremely demanding hydraulic implements may benefit from a tractor with a higher capacity or closed-center PFC system.

Steering Pump Flow (If Separate)

The AGCO Allis 8785 uses a shared pump system for both steering and auxiliary hydraulics. That means the steering and implement functions draw hydraulic fluid from the same main pump.

Under normal use, steering takes priority over auxiliary circuits. If you are using implements while steering frequently, the system will maintain safe steering control by design.

However, heavy use of both steering and other hydraulic functions may lead to slight reductions in implement speed. If you notice slow implement movement while steering, this is typical for shared systems but does not affect safety or basic operation.

Total Combined Flow

The total hydraulic flow for the 8785 is about 65 liters per minute (L/min). This figure represents the maximum fluid movement the system can provide at any time, combining both steering and auxiliary functions.

Most users will find this flow rate sufficient for running multiple remotes or medium-duty attachments. When you operate several hydraulic cylinders at once, or if flow demand is high, the system may briefly divide flow between tasks.

This can cause a short delay but will not damage the pump.

Below is a table that summarizes the hydraulic capacities on the AGCO Allis 8785:

Feature	Detail
System Type	Open-Center
Implement Pump Flow	60–65 L/min
Steering Pump Flow	Shared with implement pump
Total Combined Flow	About 65 L/min
System Pressure	180–200 bar (2,600–2,900 psi)
Remote Valves	2 or 3, double-acting

System Pressure (bar / psi)

Your AGCO Allis 8785 hydraulic system operates at a maximum pressure of about 180–200 bar (2,600–2,900 psi). System pressure is important for lifting capacity, loader work, and operating heavy cylinders.

Pressure settings are factory-set to ensure safe operation of all standard implements. If you add a loader, backhoe, or high-flow attachment, these pressure levels are typically enough for most agricultural needs.

Higher pressure can improve lifting force, but pushing the system beyond rated levels may lead to leaks or damage. For most users, the default pressure ensures both performance and safety.

Remote Valves (Number & Type)

The AGCO Allis 8785 comes standard with 2 or 3 double-acting remote valves. These auxiliary hydraulic outlets let you connect a range of implements, including mowers, balers, dump wagons, and hydraulic lifts.

Each remote is double-acting, meaning fluid can be pressurized to move pistons in both directions. This gives you finer control over attached implements.

Remotes are easy to access from the cab and clearly labeled. You can use all remotes at the same time, although simultaneous heavy use will divide available pump flow between each valve.

If you need more than 3 remotes, aftermarket kits may be available, but 2–3 outlets meet the needs of most users. The design is straightforward, reliable, and easy to connect.

Subsection	Key Details
System Type	Open-Center
Implement Pump Flow	~60–65 L/min
Steering Pump Flow	Shared with implement system
Total Combined Flow	~65 L/min
System Pressure	180–200 bar (2,600–2,900 psi)
Auxiliary Remotes	2 or 3, double-acting, for various implements

Three-Point Hitch (3PH)

The AGCO Allis 8785 is equipped with a heavy-duty three-point hitch designed for demanding field work. It offers solid performance for lifting, adjusting, and controlling various implements.

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

The three-point hitch on the AGCO Allis 8785 uses a Category 3 linkage. Category 3 hitches are common on tractors in the 100+ horsepower class and are built to handle larger, heavier implements.

This type uses lift arms and pins with a diameter of 1-1/4 inches for the lower arms and 1-1/4 inches for the top link. This hitch size lets you use equipment such as chisel plows, large planters, or big rotary cutters.

Make sure any implement is rated for a Category 3 hitch to ensure a proper fit. Using the wrong category can lead to safety hazards or improper operation.

For smaller implements, you may need an adapter, but this tractor shines when paired with full-size Category 3 tools. Category 2 tools may fit with adapters, but this is not recommended for high-stress applications.

Lift Capacity @ Ball Ends

The 3-point hitch on the 8785 provides high lift capacity at the ball ends. This lets you safely pick up and operate large, heavy implements.

Maximum lift capacity at ball ends is generally in the range of over 7,000 pounds (approx. 3,200 kg) for tractors in this horsepower segment. The exact value can vary, so always check the operator’s manual for your specific model.

This robust lift system means you can confidently handle large tillage tools, heavy-duty field cultivators, or mounted seeders without overloading the system. The lift arms are hydraulic and have adjustable drop and raise rates for safer and more precise control.

Make sure to stay within the rated limit to avoid damage. A clear display and accessible controls in the cab help you monitor hitch activity.

You can make adjustments from the operator’s seat, boosting both productivity and comfort.

Draft / Position Control

The AGCO Allis 8785 3PH system features both draft and position control. Position control lets you set the exact working height of your implement, essential for tasks like planting or mowing at a consistent depth.

You raise or lower the hitch to the desired point and it stays put even with changes in terrain. Draft control provides automatic adjustment to keep consistent soil engagement when using tillage implements.

If your plow hits a harder patch of ground, the system senses the increased resistance and lifts the implement slightly. This helps maintain traction and reduces wheel slip.

You adjust both controls using dedicated levers in the operator area. This system increases efficiency and makes time in the field less stressful, especially when conditions change moment-to-moment.

Top-Link Sensing (Yes/No)

The AGCO Allis 8785 features top-link sensing for its draft control system. With top-link sensing, the draft force is measured through the upper link of the hitch.

As the draft load changes, the system automatically adjusts the hitch height to optimize traction and maintain consistent implement depth. Top-link sensing improves the performance of soil-engaging implements by providing a faster response to changing soil conditions compared to lower-link systems.

It’s particularly effective for plowing and subsoiling, where depth and traction control are critical. This feature means you can work confidently knowing the tractor can respond quickly if soil resistance suddenly increases.

You don’t have to manually adjust the controls as often, which saves time and reduces operator fatigue.

Subtopic	Details
Hitch Category	Category 3; standard for 100+ HP tractors; 1-1/4″ lower arms and top link pin diameter
Lift Capacity @ Ball Ends	Over 7,000 lbs (approx. 3,200 kg); supports large/heavy implements; hydraulic adjustable settings
Draft/Position Control	Both included; manual position & automatic draft control with cab levers; improves field accuracy
Top-Link Sensing	Yes; draft measured via top link; automatic, fast response to soil changes; boosts productivity

Axles & Load Limits

Axle design and load limits affect how much weight your AGCO Allis 8785 can safely manage while in use. Understanding these technical details ensures safe operation and helps protect your equipment from excessive wear or damage.

Axle Part	Specification	Detail/Notes
Front Axle	Max Load (kg)	~4,000 – 4,500 (estimated)
Rear Axle	Max Load (kg)	Up to 9,000 (at 24″/610mm lift point)
Bar Rear Axle Size		3.25 in x 88 in (82 mm x 2235 mm)
Wheelbase		112.6 in (286 cm)
Final Drive		Outboard planetary

Maximum Front-Axle Load (kg)

The front axle on the AGCO Allis 8785 is designed for durability and stability. For tractors like this, the estimated maximum front-axle load is between 4,000 and 4,500 kg.

This supports the weight of any front attachments, like loaders or front weights, and the front of the tractor itself. You should avoid exceeding this load to prevent steering problems or potential axle damage.

Keeping within these limits also helps preserve tire life and steering linkage components. Front axle type and size are important, because an improperly loaded front axle can cause balance issues, especially when using heavy rear implements.

Regular checks are needed to make sure the axle is not overloaded in daily tasks.

Maximum Rear-Axle Load (kg)

The rear axle of the AGCO Allis 8785 is built for high-capacity use. The maximum rear lift at 24 inches (610 mm) behind the ball ends is 9,000 lb, which converts to about 4,082 kg.

However, the rear axle itself is designed to carry even more, with typical operating weights reaching up to 5,600 kg, depending on ballast and attachments. For field work, most of the tractor’s load rests on the rear axle, including heavy implements and carried loads.

Use the rear axle rating as your guide for safe transport and tillage operations. Overloading the rear axle can lead to failures with bearings, axles, or final drives.

Proper weight distribution ensures maximum traction while avoiding excess stress on the axle housings and reduction gears. Check rear axle conditions regularly, especially after using heavy 3-point equipment or trailers.

Final-Drive Type

The final drive on the AGCO Allis 8785 uses an outboard planetary setup. This design uses planetary gear reductions located outboard from the differential for increased strength and reliability.

Outboard planetaries reduce the load on the differential and axle shafts by spreading torque over multiple gear sets. This type of final drive is favored in higher-horsepower tractors like the 8785 because it can handle high torque and shock loads from tough field conditions.

You benefit from better reliability and reduced downtime when working with heavy implements. Maintenance on an outboard planetary system is straightforward, but regular oil checks and inspections for leaks or wear are important.

Outboard planetary drives also help lower the risk of axle twisting or breakage, especially when carrying heavy loads or pulling large equipment. This lets you get the most out of your 122 hp tractor’s working capacity.

Tires & Track Options

The AGCO Allis 8785 tractor comes equipped to support a range of farming and utility needs. Tire sizes, types, and available configurations directly impact your traction, flotation, and overall performance in the field.

Standard Front Tire Size (Ag / Turf / Industrial)

For agricultural use, the standard front tire size is 11.00-16. This size provides good steering and control in various field conditions.

If you use your 8785 on turf or lighter work, turf tires are often available from after-market suppliers, offering less ground disturbance. Standard models are usually delivered with ag tires.

Industrial front tire options are less common on this tractor, as it is primarily intended for field use. However, industrial-style tires can sometimes be fitted for loader work or hard-surfaced yards.

If you add front weights, these tires help balance the extra load and keep traction steady.

Front Tire Options Table

Tire Type	Standard Size	Main Feature	Typical Use Case
Ag	11.00-16	Traction, durability	Field, row crops
Turf (optional)	Varies	Low ground impact	Lawns, turf
Industrial	Optional	Hard surface wear	Loader, hard surfaces

Standard Rear Tire Size

Your AGCO Allis 8785 typically comes fitted with 18.4R38 rear tires. This size offers strong traction and stability for heavy tillage, planting, or hauling work.

The 18.4R38 is a radial tire, which means better grip and a smoother ride on rough ground. For some jobs, you may need a narrower or wider tire, but 18.4R38 is suitable for most general-purpose farming.

Radial construction improves tread life and reduces soil compaction. In wet or soft conditions, these tires help prevent getting stuck and support the tractor’s full 122 horsepower.

Rear Tire Details Table

Size	Type	Features	Best For
18.4R38	Radial	High traction, stable	Heavy field use

Optional Duals / Tracks / Flotation Kits

If you need extra traction or reduced ground pressure, optional dual rear wheels can be added to the 8785. Duals help spread the weight of the tractor across a larger area.

This minimizes soil compaction, especially when the tractor is equipped with front weights or heavy rear implements. Tracks are not a common factory option for this model, but some after-market track kits can be adapted.

These provide even lower ground pressure and better flotation on mud or soft fields. Flotation kits, such as wide flotation tires, are also available for certain environments.

While these options are less common, they are important for farmers working in wet or easily compacted soils.

Options Comparison Table

Option	Availability	Benefit	Situation
Rear Duals	Common	Lower compaction	Heavy tillage, soft soil
Tracks	After-market	Maximum flotation	Wet, muddy fields
Flotation Tires	Optional	Less ground impact	Sandy or soft soils

Dimensions & Weight

The AGCO Allis 8785 tractor is designed for stability, comfort, and efficient operation. Its size and weight affect how well it handles different tasks on the farm and how easily you can maneuver it in various spaces.

Feature	Specification	Notes
Wheelbase	112.6 in (286 cm)	Long wheelbase for improved balance
Overall Length	173 in (439 cm)	Includes standard hardware and fittings
Overall Width (Min Tread)	88 in (223 cm)	Adjusts for different field types
Height to ROPS / Cab	109 in (277 cm)	Measured at cab roof
Ground Clearance	Not specified	Check with dealer for precise figures
Shipping Weight	10,800 lbs (4,899 kg)	Bare tractor
Operating Weight (With Fluids)	Up to 12,450 lbs (5,647 kg)	Includes fluids and ballast options

Wheelbase

The wheelbase is 112.6 inches (286 cm). This longer wheelbase helps provide better stability, especially when you are pulling heavy implements or working on uneven ground.

A longer wheelbase spreads the tractor’s weight over a larger area. This reduces the risk of tipping and improves the ride quality for the operator.

When using front-end loaders or rear-mounted equipment, this stability becomes even more important. The wheelbase also affects turning radius.

While the 8785’s size means it needs more space to turn, it stays steady even when turning with a load attached.

Overall Length

The AGCO Allis 8785 measures 173 inches (439 cm) from front to back. This length includes standard fittings, front weights, and the rear linkage equipment.

The extended length allows you to fit attachments such as loaders and additional front weights without compromising your ability to navigate tight spots. You will want to consider this length when planning storage or transport.

Longer tractors can help improve traction by spreading the weight more evenly between the front and rear axles. For some tasks, such as working with large balers or planters, this length offers stability and a smoother performance in the field.

Overall Width (Minimum Tread)

The minimum tread width measures 88 inches (223 cm). This is the narrowest position the wheels can be set, allowing you to work in tighter fields or on narrow rows.

You can usually adjust the tread width depending on your crop needs. Wider settings increase stability on slopes, while a narrow tread is helpful for row crops and orchard work.

Before adjusting, check your manual for safety instructions and proper torque specifications on the wheel bolts. Making sure the wheels are set at the right width can help with traction and reduce the risk of rolling on uneven terrain.

Height To ROPS / Cab

The tractor stands 109 inches (roughly 277 cm) tall to the top of the cab or ROPS (Roll Over Protection Structure). This measurement is important if you need to enter barns or sheds with low clearances.

The cab is designed to give the operator good visibility. Despite the height, you should still watch for overhead wires or branches when driving.

If you add accessories like a beacon or exhaust stack, the total height may slightly increase. Always measure first to make sure the tractor fits in your storage area.

Ground Clearance

The ground clearance for the AGCO Allis 8785 is not clearly specified in public sources. This distance is the space between the lowest point underneath the tractor (excluding the axle) and the ground.

Ground clearance is vital for field operations, especially if you work in rough or uneven terrain. It reduces the risk of getting caught on stumps, rocks, or crop debris.

For specific ground clearance numbers, it is best to contact your dealer or measure the tractor directly after installation of your chosen tire sizes. The right clearance helps protect the belts and critical driveline components from ground damage.

Shipping Weight

The tractor’s shipping weight is about 10,800 pounds (4,899 kg). This weight includes the basic tractor without fuel, ballast, or extra equipment and is important for transportation planning.

When arranging delivery or pickup, knowing the shipping weight helps select the correct trailer and makes sure you do not exceed road weight limits. If you install extra parts such as loaders or front weights, the total shipping weight will increase.

Always follow guidelines for secure tie-downs during transport to prevent movement and protect belts and other moving parts. Make sure all fluids are drained when required for certain types of long-distance freight.

Operating Weight (With Fluids)

The operating weight can reach up to 12,450 pounds (5,647 kg) when the tractor is filled with fuel, hydraulic oil, coolant, and ballast options such as wheel weights or water in the tires.

This weight is what matters most during daily use. Heavier operating weight improves traction but may compact the soil more, so it’s a balance based on your intended tasks.

Check your manual for recommendations on fluid levels and correct belt tension, as carrying more weight can affect driveline performance. Regular checks of belt condition are important since extra loads can put more strain on the system and related components.

Fuel & Fluids

Managing fuel and fluid levels in your AGCO Allis 8785 tractor is essential for reliable performance. Each system has specific requirements for capacity and type.

Fuel-Tank Capacity

The AGCO Allis 8785 comes with two possible fuel tank sizes, depending on whether your tractor is equipped with a cab or just a rollover protection structure (ROPS). A ROPS model holds about 42 gallons (159.0 liters).

If your tractor has a cab, the fuel tank is larger, holding about 59 gallons (223.3 liters). This difference allows for longer operating hours between refuels, especially with the cab model.

Always use clean, high-quality diesel fuel to avoid clogging filters or damaging the engine. Check the fuel gauge regularly, especially during long tasks.

Be sure your fuel cap seals tightly to prevent contamination and evaporation.

DEF-Tank Capacity (If Applicable)

The AGCO Allis 8785 was manufactured in the late 1990s. This predates modern diesel emission standards and the introduction of Diesel Exhaust Fluid (DEF) systems.

As a result, you do not need to fill or maintain a DEF tank on this tractor. You do not have to worry about sourcing or refilling DEF, simplifying regular maintenance.

No DEF warning or dashboard lights should appear for this model, and no DEF-related system is present on the 8785.

Engine Oil Capacity

Maintaining the right engine oil level ensures your tractor runs smoothly and avoids damage. The AGCO Allis 8785 uses a 6-cylinder diesel engine (either SisuDiesel 6.6L or Cummins 5.9L, depending on the specific tractor).

Typical engine oil capacity is about 17 quarts (16 liters), but check your manual for the exact specification for your engine. Use diesel-rated engine oil that meets the manufacturer’s viscosity and quality standards.

Check the engine oil before each use. Change the oil and filter at the intervals listed in your manual, especially after heavy use or operating in dusty conditions.

Hydraulic/Transmission Oil Capacity

The 8785’s hydraulic and transmission systems share a common reservoir. When adding fluid, use only high-quality hydraulic/transmission oil specified by AGCO.

The total hydraulic/transmission oil capacity for this model is approximately 36 gallons (136 liters). A low fluid level can cause whining noises in the hydraulics, slow or jerky movement, and poor transmission response.

Check the sight glass or dipstick regularly. Top off the fluid as needed, but also inspect for leaks.

Change oil and filters on schedule to avoid contamination and ensure efficient operation.

Summary Table: AGCO Allis 8785 Fuel & Fluids

Component	Capacity	Fluid Type/Notes	Maintenance Notes
Fuel Tank (ROPS)	42 gal (159 L)	Diesel	Use clean diesel; check level frequently
Fuel Tank (Cab)	59 gal (223.3 L)	Diesel	Longer run time for cab models
DEF Tank	Not Applicable	N/A	No DEF system on this model
Engine Oil	17 qt (16 L) approx.	Diesel engine oil, manufacturer rating	Change per manual; check before every use
Hydraulic/Transmission	36 gal (136 L) approx.	AGCO-spec hydraulic/transmission fluid	Use correct fluid; top off and change as needed

Electrical System

The AGCO Allis 8785 tractor uses a practical and easy-to-maintain electrical setup. It features a negative ground system, standard battery voltage, reliable cold cranking amps, and an alternator designed to keep up with the machine’s electrical load.

Electrical Component	Specification/Details	Importance
Ground Type	Negative	Standard in most modern tractors
Alternator Output	85-120 Amps (varies by model)	Supports lights, sensors, and electronics
Battery Voltage	12 Volts	Powers starter and main controls
Battery CCA	900-1000 CCA	Needed for cold starts

Ground Type (Negative / Positive)

You will find that the AGCO Allis 8785 uses a negative ground system. This means the negative battery terminal is connected to the frame of the tractor.

Most equipment and vehicles today use the same type, making replacement parts and accessories easier to find. This system helps prevent corrosion and electrical shorts, especially in tractors that work in harsh or damp environments.

When you service or replace any electrical part, always check the polarity to avoid damaging sensitive electronics. Negative ground is common across the AGCO line and helps protect electrical components.

This system also means you can use standard testing equipment without worrying about unusual wiring.

Alternator / Charging System

The alternator on the AGCO Allis 8785 is built to supply enough power for all lighting, electronic controls, and extra accessories you may add. It is typically a belt-driven alternator mounted at the front of the engine.

This charging system replaces lost battery power while the engine runs. It also keeps voltage steady for lights, warning systems, and the cab’s climate controls.

If you add high-draw items like extra lights or monitors, make sure the alternator handles the extra load. Regular checks of the alternator belt and wiring help you avoid unexpected breakdowns.

An underperforming charging system often leads to starting trouble or weak lights, important for early morning or evening work.

Charging Output (Amps)

The alternator’s charging output on the AGCO Allis 8785 ranges from around 85 to 120 amps depending on the year and specific configuration. This is more than enough for standard operation, including the factory lighting, air conditioning, and PTO controls.

If your tractor has extra attachments such as GPS units or powerful work lights, check if the alternator still supplies enough current. Too many add-ons can overload the system and shorten the life of both the alternator and battery.

You can measure alternator output with a multimeter if you notice low battery voltage or dim lights.

Battery Voltage

The main battery in the AGCO Allis 8785 is 12 volts. This is the standard for nearly all modern farm tractors, and it is compatible with most replacement batteries and jump starters.

Twelve-volt power makes finding replacements easy if the original battery fails. This voltage is necessary to turn over the large turbocharged diesel engine, especially in cold weather.

If your tractor has trouble starting, check both the battery voltage and the connections. Loose or corroded cables can prevent the battery from delivering full power to the starter motor.

Battery CCA Rating

You should use a battery rated at 900 – 1000 Cold Cranking Amps (CCA) for the AGCO Allis 8785. CCA is a measure of how well a battery can start the engine when it’s cold, which is critical for diesel tractors.

A higher CCA ensures the engine starts easily even on freezing mornings. If you live where winters are harsh, always choose the higher CCA option.

Lower CCA batteries may leave you stranded with a tractor that won’t crank when you need it most. Check the manufacturer’s recommendations before buying a new battery.

Regular testing can alert you to batteries losing strength, so you can replace them before they fail.

Total Cost Of Ownership Metrics

Understanding the costs linked to the AGCO Allis 8785 Tractor helps you plan budgets and predict long-term expenses. Each metric shows real financial influence, including service, repairs, fuel, and value loss over time.

Metric	Typical Figure	Notes
Service Intervals	Every 250 hours (engine oil)	Other fluids at 500–1,000 hours
Annual Maintenance Cost	$2,500–$3,500	Based on average use (600–800 hours/year)
Depreciation Curve	7–10% per year	Slower after 10 years
Fuel Consumption @ Rated Load	21–24 L/hr	Varies with job and load

Recommended Service Intervals

You should change the engine oil and oil filter every 250 hours of use. Other key fluids, like transmission and hydraulic oils, need replacement every 500–1,000 hours, depending on your use and manual guidance.

Air filters require checking and cleaning every 100–200 hours, especially when working in dusty areas. Fuel filters should be replaced at least once per year, but more often if you run many hours or use lower-quality fuel.

Grease all fittings at intervals listed in your owner’s manual (often every 50 hours of operation). Regular inspection of belts, hoses, and coolant levels is needed to prevent breakdowns and reduce repair costs.

Estimated Annual Maintenance Cost

You can expect maintenance costs to average between $2,500 and $3,500 each year if you operate your AGCO Allis 8785 for 600 to 800 hours annually. This figure covers fluids, filters, tire wear, minor repairs, and labor if you hire out service work.

Parts prices, shop rates, and workloads may change this cost. Older machines often cost more to maintain due to worn components.

Major repairs like engine or transmission work are not included in this estimate and can increase yearly costs in high-houred tractors.

Depreciation Curve (% Per Year)

This tractor typically loses about 7–10% of its value per year for the first ten years if kept in average working condition. Depreciation slows after major value drops in the early years, so older tractors retain their value better as long as they remain functional.

The actual rate depends on condition, total hours, and regional resale trends. Well-maintained, low-hour units can lose value at the slower end of the range.

High-hour or poorly maintained machines drop faster. After about ten years, annual depreciation falls to 3–5% per year, assuming normal wear and regular upkeep.

Fuel Consumption @ Rated Load (L hr⁻¹)

At full rated load, the AGCO Allis 8785 uses about 21 to 24 liters of diesel per hour. This range depends on the job, how heavy the implements are, and the type of terrain.

Field tasks like plowing and tillage use the higher end. Transport or lighter PTO work tend to be lower.

Lower rpm operation and careful shifting can save fuel. Monitoring usage can help you estimate fuel budgets and spot if something is wrong, like worn injectors or excessive engine wear.