The U.S. Environmental Protection Agency (EPA) and Environment Canada requires all off-road diesel engines with 18.6 kW (25 hp) or more to meet stringent FT4 emissions regulations. John Deere uses the most efficient and cost-effective solution for the tractor package to meet emissions requirements at each horsepower level. The 5M delivers a hassle-free emissions solution that allows faster work and operation with ease.

The engine powering the 5M is EPA certified Tier Level 4. This is achieved through a combination of a diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR) using diesel exhaust fluid (DEF, or urea).

Several defining features on the 5M maximize the performance and reliability of the emissions package. A completely shielded DOC/SCR not only protects essential components from damage, it also keeps out dirt and debris. The well-packaged and tightly organized circulation system means there is more room to work around the tractor.

Key components of the emissions system include:

DOC

John Deere has chosen to utilize an exhaust filter to reduce particulate material so the engine can operate at a level which produces less NOx. With less NOx created, less DEF is required to treat. The result is improved total fluid economy (diesel and DEF).

The engine is programmed to aggressively respond to changes in power needs, which can temporarily increase particulate matter. Since the exhaust filter removes particulate matter instead of the engine, the engine is left free to do what it is designed to do – deliver all of the power, torque, plus transient response needed.

DEF

DEF is an ISO 22241 standard aqueous urea solution consisting of 32.5 percent urea and has a freezing point of -11°C (12°F). A heated DEF tank keeps the customer in the field longer even when the temperatures drop below freezing. The DEF tank header is integrated with a temperature sensor, and plumbed engine coolant lines are used to promote thawing and prevent freezing in the tank during operation.

Mounted near the DEF tank, the electronic control unit (ECU)-controlled supply module draws diesel exhaust fluid from the storage tank and provides a pressurized flow to the dosing module. When the ignition key is off, the supply module pump will reverse direction to return any accumulated fluid back to the tank. The supply module is also fitted with a replaceable filter to prevent contaminants from entering the dosing lines. Both the supply module and dosing lines are electrically heated and controlled by the ECU to determine when DEF dosing can begin.

The dosing module is cooled by engine coolant and used to inject DEF at a pressure of 9 bar (900 kPa, 130 psi) into the decomposition tube. A harness is connected to the dosing valve that relays the needed DEF to inject based upon the amount of NOx exiting the DOC measured from the NOx tube sensor.

The decomposition tube is the internal mixing device used to circulate DEF with engine exhaust prior to entering the SCR/AOC after-treatment device.

SCR

To reduce the NOx, DEF is injected into the exhaust stream. When the exhaust gases combine with the DEF in the SCR catalyst, the NOx is broken down into nitrogen and water vapor.

Exhaust gas recirculation (EGR)

EGR reduces the high temperatures where these compounds are formed in the engine cylinders by replacing excess oxygen with a prescribed amount of cooled exhaust gas.

Exhaust gases contain more carbon dioxide than oxygen. The EGR valve, in conjunction with the venturi tube, and engine control unit (ECU), allow a controlled amount of exhaust gas to enter the intake manifold to mix with the incoming fresh air.

Replacing excess oxygen with cooled exhaust gas leads to:

• Lower combustion temperatures, creating less NOx.

In addition, EGR allows for:

• Advanced timing
• Optimal engine performance
• Maximum fuel economy

For added performance and efficiency, the engine passes the exhaust gases through an EGR cooler before it enters the engine.

Exhaust airflow enters the EGR cooler from the exhaust manifold near the turbocharger. Based on engine load, air temperatures, and rpm, the ECU opens or closes the EGR valve, allowing a measured percentage of exhaust gas to enter the intake manifold. The gases mix with the rest of the incoming air from the turbocharger and aftercooler before entering the cylinders.

Series turbochargers

The PowerTech PWL 4.5L (274.6-cu in.) engine utilizes one turbocharger — a fixed geometry turbocharger. Fresh air is first drawn into the low-pressure fixed geometry turbocharger and compressed to a higher pressure. The compressed air is then routed to the charge air cooler and then to the intake manifold.

Benefits of air-to-air aftercooling

• Lowers the intake manifold air temperature
• Provides more efficient cooling while reducing temperatures for greater engine reliability
• Higher volume of air flows into the cylinders
• Engine can meet the increasing horsepower demands

Combustion process with externally cooled EGR

Functions:

• According to engine operating conditions, the recirculated exhaust gases reduce the oxygen portion in the intake air to approximately 20 percent. Without any increase of the charge air pressure, the oxygen rate is not high enough to ensure a complete combustion of the fuel injected at high engine loads.

Advantages:

• Fuel-efficient combustion is achieved because sufficient oxygen is provided.

A restrained, cooler combustion is realized, since the typical hot combustion process, which is generated by an oxygen surplus, is dampened by the inert exhaust gases. Hence, NOx emissions are reduced.

For more information regarding EPA regulations and the technology behind John Deere Integrated Emissions Control systems, please visit the following link:

http://www.deere.com/wps/dcom/en_US/campaigns/ag_turf/emissions/final_tier_4.page

Putting more power to the ground translates to increased productivity in demanding conditions. Simply put, torque is the useable power that can be achieved. More torque leads to more lugging ability which helps the operator be more productive.

5M Final Tier 4 (FT4) engines feature up to a 4 percent power bulge when put under load. The power bulge feature of the electronically controlled engine delivers additional horsepower as engine rpm drops below rated speed. Additionally, a 30 percent torque rise provides the force that maintains horsepower as engine rpm drops below rated speed.

When the tractor is under load, power bulge and torque rise work together to get through the tough spots without having to downshift. Horsepower and torque are mathematically related.

As rpm drops, the only way to maintain or increase horsepower is to provide additional torque. The output horsepower is greater than or equal to rated horsepower as the engine is pulled down to 1750 rpm.

The peak torque rise also occurs near the rated economy power take-off (EPTO) speed.

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5M Tractors can be ordered with AutoTrac integrated in the tractor display.

AutoTrac is a great solution if you are looking for a lower-cost integrated guidance system for your utility tractor. For the straight track only feature, you will no longer need an additional display or display activation. When a 5M Utility Tractor is ordered with AutoTrac Ready (code 182D), the AutoTrac screen is included; all you need to add is a StarFire™ 6000 Receiver (code 1881).

Benefits of AutoTrac on the tractor display:

• Simple and user friendly
• Total cost of integrated AutoTrac is 36 percent lower by eliminating the need for a precision ag display
• Reduces startup costs with no display activation or subscription fees
• Reduces operator fatigue
• Eliminates implement overlap and optimizes machine efficiency

5M Tractors can also be factory equipped with a 4240 Universal Display (code 190M) that transitions AutoTrac guidance from the tractor display to the Gen 4 4240 Universal Display for additional capabilities:

• On-screen mapping
• Documentation
• Section Control

NOTE: Once the 4240 is disconnected, the tractor display is re-activated.

OVERVIEW

A Category 2, 3-point hitch on 5M Tractors provides the lift capacity and compatibility to perform in a variety of different applications. The 3-point hitch adapts to a wide variety of implements and has plenty of lift capacity to handle heavy implements such as planters, sprayers, and field cultivators.

BENEFITS

• With the choice of either mechanical or electrohydraulic hitch controls, hooking up implements is convenient with telescoping draft links, adjustable sway bars, and interchangeable hitch balls.
• Both mechanical and electrohydraulic hitch controls have a depth stop for consistency when lowering the hitch. Each time the position control lever is pushed forward, it stops where the depth stop has been positioned.

Optional larger cylinders are available for increased lift capacity:

• PowrReverser™ transmission models: 65-mm (2.56-in.) cylinders in base with electrohydraulic hitch lift capacity of 2340 kg (5159 lb); option of one 65-mm (2.56-in.) and one 75-mm (2.95-in.) lift cylinder (averaging to 70 mm [2.75 in.]) which provides electrohydraulic hitch lift capacity of 2701 kg (5955 lb)
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• PowrQuad™ PLUS and Powr8™ transmission models: 75-mm (2.95-in.) cylinders in base with hitch lift capacity of 3164 kg (6975 lb); option of 80-mm (3.15-in.) cylinders with hitch lift capacity of 3569 kg (7868 lb)

ADDITIONAL DETAILS

Adjustable sway bars and telescoping draft links can be easily adjusted to adapt to a wide variety of implements. The right lift link also adjusts without tools for added convenience when leveling implements.

Operators do not need to carry a tool to adjust the rear hitch. Operators can also raise and lower the 3-point hitch from outside of the tractor with the conveniently located rear fender hitch controls.

An updated three-point quick hitch is offered on the 5M Tractors.

• This updated design is a break from the existing welded quick hitch as the frame is cast.
• The curved design eliminates the potential for contact with the rear fender and extensions.
• The quick hitch is available as a field kit option.

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