John Deere 990 : Parts, Manuals, Diagrams, Specs

March 6, 2025 John Deere, John Deere Parts, John Deere Parts Diagrams, John Deere Parts Manual PDF, John Deere Tractors, Manufacturers, Tractors Comments Off on John Deere 990 : Parts, Manuals, Diagrams, Specs
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John Deere 990

The John Deere 990 is a compact utility tractor manufactured between 2000 and 2007. It features a 2.0L Yanmar 4-cylinder diesel engine, delivering a gross power of 40.4 horsepower and a net power of 38.5 horsepower. Its PTO (Power Take-Off) is rated at 35 horsepower, making it suitable for various agricultural and utility tasks.

The tractor offers both two-wheel and four-wheel drive options, with a partially synchronized 9-speed transmission for smooth operation. Its robust mechanical design includes planetary final drives, a mechanical rear differential lock, power steering, and wet disc brakes. The John Deere 990 is equipped with a two-post ROPS (Roll-Over Protective Structure) for operator safety.

In terms of capacity, the fuel tank holds 8.5 gallons, while the hydraulic system has a capacity of 5.5 gallons, operating at a pressure of 2262 psi with a total flow of 13 gallons per minute. The open-center hydraulic system ensures efficient operation of attachments such as loaders and backhoes.

The tractor’s rear hitch is Category I, with a lift capacity of 1,573 pounds at 24 inches behind the lift point. It features a live PTO with a two-stage clutch and operates at a standard rear RPM of 540. Its dimensions include a wheelbase of 68.9 inches and a weight range from 2,594 to 3,175 pounds, depending on configuration.

The John Deere 990’s versatility is further enhanced by its compatibility with various attachments, including front-end loaders and backhoes. Its reliable performance and straightforward design make it popular among small-scale farmers and property owners seeking an efficient utility tractor for diverse applications

John Deere 990 Specs

The John Deere 990 is equipped with a Yanmar 2.0L 4-cylinder diesel engine. It delivers a gross engine power of 40.4 horsepower (30.1 kW) and a net engine power of 38.5 horsepower (28.7 kW). The Power Take-Off (PTO) is rated at 35 horsepower (26.1 kW). The engine features a displacement of 121.7 cubic inches (2.0 L) with a bore and stroke of 3.31 x 3.54 inches (84 x 90 mm).

This compact utility tractor comes with a 9-speed partially synchronized transmission. It is available in both two-wheel drive and four-wheel drive configurations. The tractor is equipped with planetary final drives, a mechanical rear differential lock, power steering, and wet disc brakes for efficient operation and control.

The John Deere 990 has a wheelbase of 68.9 inches (175 cm). Its weight ranges from 2,594 lbs (1,176 kg) for the 2WD version to 3,175 lbs (1,440 kg) for the 4WD version. The tractor’s length is 123 inches (312 cm), with a hood height of 54 inches (137 cm) and a ROPS height of 84.2 inches (213 cm).

The tractor features an open center hydraulic system with a capacity of 5.5 gallons (20.8 L). It operates at a pressure of 2,262 psi (156.0 bar) with a total flow of 13 gpm (49.2 lpm). The rear hitch is Category I, capable of lifting 1,573 lbs (713 kg) at 24 inches behind the lift point.

The John Deere 990 is equipped with a live rear PTO featuring a two-stage clutch, operating at a standard 540 RPM. The electrical system includes a 20-amp alternator, a 650 CCA battery, and operates on 12 volts with a negative ground.

The fuel tank has a capacity of 8.5 gallons (32.2 L). The engine oil capacity is 5.6 quarts (5.3 L), while the coolant system holds 6.1 quarts (5.8 L).

Standard tire sizes for the 2WD model are 6.5-16 for the front and 14.9-24 for the rear. The 4WD model typically uses 8-16 tires on the front.

John Deere 990 Prices

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  • Typical prices for used John Deere 990 tractors range from $16,900 to $19,000, depending on condition, hours of use, and included attachments.

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  • Rental costs vary based on duration:

    • Daily: Approximately $300

    • Weekly: Approximately $2,100

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  • Age and model year (produced between 2000–2007)

  • Hours of operation (e.g., lower hours typically command higher prices)

  • Included attachments (e.g., loaders or backhoes)

  • Condition and maintenance history

These prices reflect current market trends for buying or renting this compact utility tractor (March 2025)

Where to Check Prices:


Several online platforms offer listings for John Deere 990 tractors. These websites allow you to browse current offerings and compare prices from various sellers.


John Deere dealerships often list their inventory online, including both new and used models. Checking dealer websites can give you an idea of retail prices in your area.


Farm equipment auctions, both online and in-person, can be good sources for pricing information. These sites often have historical data on past sales, which can help you gauge market trends.


Online forums dedicated to tractors and farm equipment can be valuable resources. Members often discuss recent purchases and share pricing information.


Local and regional farm equipment classifieds, both in print and online, frequently list John Deere 990 tractors for sale. These can provide insight into prices in your specific area.


Some websites offer equipment valuation tools that can provide estimated prices based on the tractor’s age, condition, and features.


Visiting or calling local John Deere dealerships can give you current pricing information. They can also provide details on any ongoing promotions or financing options.

Remember that prices can vary significantly based on factors such as the tractor’s condition, hours of use, included attachments, and local market demand.

John Deere 990 Parts


The John Deere 990 uses a Yanmar 2.0L 4-cylinder diesel engine. Key engine components include pistons, piston rings, rod bearings, main bearings, oil pump, timing kit, balance shaft bearings, valvetrain components, and lifters. Regular maintenance may require replacement of these parts to ensure optimal performance.


The tractor features a 9-speed partially synchronized transmission. Parts for this system include gears, shafts, and synchronizers. Proper maintenance of these components is crucial for smooth operation and longevity of the tractor.


The John Deere 990 has an open-center hydraulic system. Essential parts include hydraulic pumps, valves, hoses, and filters. Regular replacement of hydraulic filters is necessary to maintain system efficiency.


Key electrical components include a 12-volt battery, 20-amp alternator, and various switches and sensors. The electrical system is crucial for starting the tractor and powering its various functions.


The cooling system consists of a radiator, water pump, thermostat, and associated hoses and clamps. Regular maintenance of these components helps prevent overheating and ensures optimal engine performance.


Important fuel system parts include the fuel tank, fuel pump, injectors, and fuel filters. Regular replacement of fuel filters is essential for maintaining engine efficiency and preventing contamination.


The tractor uses wet disc brakes and power steering. Components such as brake pads, steering cylinders, and power steering pump may require periodic replacement or maintenance.


Various attachments are available for the John Deere 990, including loader buckets, mower decks, and rear implements. Parts for these attachments, such as blades, belts, and hydraulic fittings, may need regular replacement.


Regular maintenance items include air filters, oil filters, fuel filters, and hydraulic filters. John Deere offers convenient Filter Paks that include most of the necessary maintenance filters for compact utility tractors.


Body and frame parts include hood components, fenders, seats, and ROPS (Roll-Over Protective Structure). While these parts typically require less frequent replacement, they are essential for operator comfort and safety.

John Deere 990 Problems


Some John Deere 990 owners have reported electrical problems, particularly with starting the tractor. In some cases, the tractor won’t start unless a jumper is connected directly from the battery’s positive post to the starter. This issue may be related to blown fuses or other electrical system faults.


The 990 has been known to experience fuel starvation issues, especially when operating on hillsides. Even with a half-full tank, the tractor may lose fuel flow due to the design of the fuel tank and fuel line placement. This can cause the engine to stall unexpectedly during operation on slopes.


Early models of the 990 had the exhaust positioned low and towards the front of the tractor. This placement could lead to exhaust fumes accumulating around the operator when mowing tall grass or operating in similar conditions, potentially causing discomfort or health concerns.


Some users have reported that the 990 produces unusually harsh exhaust compared to other diesel equipment, which can cause eye irritation and discomfort for the operator.


While generally praised for its performance, some owners have found that the 430 loader equipped on the 990 can struggle with heavy loads, particularly when lifting full buckets of materials like gravel.


The 990 can be susceptible to fuel contamination issues, especially if the fuel cap is missing or damaged. This can lead to water entering the fuel system during rain or other wet conditions, causing engine performance problems.


Regular maintenance is crucial for the 990, with particular attention needed for the fuel system. Neglecting to change fuel filters or allowing poor quality fuel to be used can lead to performance issues and potential engine damage.

John Deere 990 Horsepower


The John Deere 990 tractor is equipped with a Yanmar 2.0L 4-cylinder diesel engine that delivers the following horsepower ratings:

  • Gross Engine Power: 40.4 horsepower (30.1 kW)

  • Net Engine Power: 38.5 horsepower (28.7 kW)


The Power Take-Off (PTO) of the John Deere 990 is rated at:

  • PTO Power (claimed): 35 horsepower (26.1 kW)


The engine powering the John Deere 990 has the following specifications:

  • Model: Yanmar 4TNE84

  • Displacement: 121.7 cubic inches (2.0 L)

  • Bore and Stroke: 3.31 x 3.54 inches (84 x 90 mm)

  • Compression Ratio: 18:1

  • Rated RPM: 2700


The John Deere 990’s engine is designed to provide reliable power for various utility and agricultural tasks. Its horsepower ratings make it suitable for a range of applications, from light fieldwork to operating attachments like loaders and mowers.

John Deere 990 Oil Capacity


The John Deere 990 tractor has an engine oil capacity of 5.6 quarts (5.3 liters). This includes the oil filter capacity.


The transmission oil capacity for the John Deere 990 is 22 quarts (20.8 liters).


The hydraulic system of the John Deere 990 has a capacity of 5.5 gallons (20.8 liters).


The cooling system fluid capacity is 6.1 quarts (5.8 liters).


While not an oil capacity, it’s worth noting that the fuel tank capacity of the John Deere 990 is 8.5 gallons (32.2 liters).


Regular oil changes are crucial for maintaining the performance and longevity of the John Deere 990. It’s recommended to change the engine oil and filter every 200 hours of operation or annually, whichever comes first. Always refer to the operator’s manual for specific maintenance schedules and recommended oil types for your tractor’s operating conditions.

John Deere 990 Baler

The John Deere 990 tractor, with its 35 PTO horsepower, can technically operate certain balers, but its suitability depends on the type of baler and the specific conditions of use.


The John Deere 990 is not designed to handle large round balers like the John Deere 990 Variable Chamber Round Baler. These balers typically require significantly more power and weight than the 990 tractor can provide, as they demand a higher PTO horsepower and overall stability for efficient operation.


The John Deere 990 may be able to operate small square balers under ideal conditions. However, its relatively light weight and PTO power might limit its effectiveness, especially in heavy or dense hay conditions. Using a heavier tractor with at least 50 PTO horsepower is often recommended for consistent performance with balers.

  • : The John Deere 990 is considered too light for many baling tasks, which can lead to instability during operation.

  • : While it meets the minimum PTO horsepower requirement for some small balers, it may struggle in demanding conditions or with larger bale sizes.

  • : In hilly or uneven terrain, the tractor’s limited weight and power could pose challenges when pulling a baler.


For optimal performance, pairing the John Deere 990 tractor with smaller, lightweight balers is advisable. For larger-scale baling operations or heavier equipment like the John Deere 990 Round Baler, a more powerful and heavier tractor would be more suitable.

John Deere 990 Weight

The John Deere 990 tractor’s weight varies depending on its configuration:

  • 2WD (Two-Wheel Drive) model: 2,594 lbs (1,176 kg)

  • 4WD (Four-Wheel Drive) model: 3,175 lbs (1,440 kg)

The John Deere 990 has specific weight limits for different parts of the tractor:

  • Maximum Drawbar Weight: 825 lbs (374 kg)

  • Maximum Front Axle Weight: 5,513 lbs (2,500 kg)

  • Maximum Rear Axle Weight: 5,292 lbs (2,400 kg)

To provide context for the weight, here are some key dimensions of the John Deere 990:

  • Wheelbase: 68.9 inches (175 cm)

  • Length: 123 inches (312 cm)

  • Height (to top of hood): 54 inches (137 cm)

  • Height (to top of ROPS): 84.2 inches (213 cm)

The weight of the John Deere 990 is an important factor in its performance and versatility:

  • The difference in weight between 2WD and 4WD models affects traction and stability.

  • The tractor’s weight distribution impacts its balance and handling, especially when using attachments.

  • Understanding weight limits is crucial for safe operation, particularly when using implements or working on varied terrain.

John Deere 990 Oil Filter

The John Deere 990 tractor uses the oil filter model M806419. This filter is designed specifically for John Deere engines to provide optimal protection and performance.

The oil filter should be replaced:

  • After the first 50 hours of operation

  • Every 200 hours of operation thereafter

  • At least once annually, whichever comes first

  • Increased dirt-holding capacity

  • Designed for long life and durability

  • Protects the engine from harmful debris

When installing the new oil filter:

  • Ensure the gasket is properly seated

  • Hand-tighten the filter, then turn an additional 3/4 turn

  • Check for leaks after starting the engine

When changing the oil filter, it’s important to note that the John Deere 990’s engine oil capacity is approximately 5.6 quarts (5.3 liters), including the oil filter.

  • Always use genuine John Deere filters for best performance and engine protection

  • Change the oil and filter simultaneously for optimal engine care

  • Dispose of used oil and filters properly according to local regulations

Regular oil and filter changes are crucial for maintaining the performance and longevity of your John Deere 990 tractor. Always consult your operator’s manual for specific maintenance schedules and procedures.

John Deere 990 Fuel Filter

The John Deere 990 uses fuel filter part number T111383, designed specifically for this tractor model and compatible with other John Deere models such as the 870, 970, and 1070.


The fuel filter should be replaced every 500 hours of operation or annually, depending on usage conditions. In dusty or extreme environments, more frequent replacement may be necessary.

  • Superior water separation to prevent contamination.

  • Coated media for effective debris trapping.

  • Designed to ensure clean fuel flow for optimal engine performance.

  1. Shut off the fuel supply before removing the old filter.

  2. Clean the fuel strainer bowl to remove sediment or debris.

  3. Install the new filter, ensuring the rubber gasket is properly seated.

  4. Bleed air from the fuel lines by filling the filter bowl until no air bubbles remain.

  5. Tighten the filter securely and check for leaks after starting the engine.

  • Always use genuine John Deere filters for reliability and compatibility.

  • Regularly inspect the fuel strainer bowl for sediment buildup.

  • Dispose of used filters according to local environmental regulations.

Proper maintenance of the fuel filter ensures efficient engine operation and prevents costly repairs caused by contaminated fuel.

John Deere 990 Parts Diagram

  • 2.0L Yanmar 4-cylinder diesel engine

  • Cooling system (radiator, hoses, thermostat)

  • Fuel system (fuel tank, fuel filter, fuel lines)

  • Air intake and filtration system

  • 9-speed partially synchronized transmission

  • Differential

  • Axles and final drives

  • PTO (Power Take-Off) system

  • Hydraulic pump

  • Control valves

  • Hydraulic lines and fittings

  • Hydraulic filter

  • Battery

  • Alternator

  • Starter motor

  • Wiring harness and fuses

  • Seat

  • Steering wheel and column

  • Instrument panel and controls

  • ROPS (Roll-Over Protective Structure)

  • Front axle assembly

  • Tie rods

  • Steering cylinder

  • Three-point hitch

  • Drawbar

  • Lift arms and links

  • Front and rear wheel assemblies

  • Tires

  • Hood and grille

  • Fenders

  • Main frame

  • Front-end loader mounting points

  • Mid-mount mower deck attachment points

  • Rear implement attachment points

John Deere 990 Attachments

The John Deere 990 compact utility tractor is designed to work with a variety of attachments, enhancing its versatility for different tasks. Some of the key attachments include:


A popular attachment for the 990, allowing for material handling, lifting, and loading tasks.


Can be attached to the rear of the tractor for digging and excavation work.


Various sizes of mower decks can be attached for lawn maintenance and field mowing.


Useful for cutting thick grass, brush, and light woody vegetation.


For soil preparation and cultivation in gardens or small fields.


To clear snow from driveways and paths during winter months.


For grading, leveling, and moving materials like gravel or soil.


Attachable augers for digging holes for fences or planting.

The John Deere 990 features:


A Category I three-point hitch system for attaching various implements to the rear of the tractor.


A live PTO system operating at 540 RPM to power various attachments.


An open-center hydraulic system with a capacity of 5.5 gallons and a total flow of 13 gallons per minute, supporting the operation of hydraulic attachments.

When selecting attachments for the John Deere 990, consider:

  • The tractor’s horsepower rating (35 PTO hp) to ensure compatibility with power requirements.

  • The weight and size of attachments in relation to the tractor’s lift capacity and stability.

  • The specific model year of your 990, as attachment compatibility may vary slightly across production years.

Always refer to the operator’s manual and consult with a John Deere dealer to ensure proper attachment selection and installation for safe and efficient operation.

FAQ


The John Deere 990 has a gross engine power of 40.4 horsepower and a PTO power of 35 horsepower.


The John Deere 990 features a 9-speed partially synchronized transmission.


The fuel tank capacity of the John Deere 990 is 8.5 gallons (32.2 liters).


The hydraulic system capacity of the John Deere 990 is 5.5 gallons (20.8 liters).


The John Deere 990 has a Category I three-point hitch.


The three-point hitch lift capacity is 1,573 pounds (713 kg) at 24 inches behind the lift point.


The John Deere 990 was manufactured from 2000 to 2007.


The John Deere 990 uses a Yanmar 2.0L 4-cylinder diesel engine.


The weight of the John Deere 990 varies from 2,594 lbs (1,176 kg) for the 2WD model to 3,175 lbs (1,440 kg) for the 4WD model.


The wheelbase of the John Deere 990 is 68.9 inches (175 cm).


The John Deere 430 loader is commonly used with the 990 model.


The John Deere 990 has a standard rear PTO speed of 540 RPM.


The John Deere 990 has a total hydraulic flow of 13 gallons per minute (49.2 lpm).


The John Deere 990 is equipped with power steering.


Common attachments include front-end loaders, backhoes, mower decks, rotary cutters, tillers, and post hole diggers.