2025 John Deere Lawn & Garden 4066R 

• Turbocharged diesel engine
• PowrReverser™ or eHydrostatic Transmission Options
• Cab or Open Station configurations
• Premium features: Hitch Assist, Aux Hitch Control, HST controls

Features May Include: 

• Attractive styling provides improved visibility and serviceability

The bold styling of the 4M and 4R Tractors provide an attractive and functional appearance similar to that of the larger agricultural tractors. Benefits of this styling include:

• Easy tractor family identification
• Updated fixed grille and side panel hood design allows for optimum sealing of the cooling compartment
  • Front grille slides up to an integrated maintenance position for easy battery access
• Easily removable cowl, allowing for serviceability access
• Wraparound-style halogen headlights
  • Premium integrated automotive style headlight bezels
• Bold graphics
• Aggressively sloped hood design, giving a softer, smoother look and providing improved visibility
• Hybrid exhaust in base on cab tractors for clear operator visibility and safety
  • At low speed and when tractor is in a filter cleaning process, exhaust will be routed through vertical exhaust outlet. In all other cases, the exhaust will be routed through the downward exhaust outlet.
  • Side exhaust in base on open operator station tractors and ensures minimal heat impact to operator

The result gives the tractor a distinctive appearance and feel.

• Powerful Yanmar® diesel engine delivers plenty of power under heavy loads

The engine uses the latest technologies to optimize fuel economy, improve control and accuracy, and reduce environmental impact.

The common rail system (CRS) optimizes fuel economy and reduces operating costs*. High-pressure injection atomizes fuel into finer particles which burn more completely. It results in improved fuel economy and lower cost of operation.
 

The electronic control unit (ECU) provides optimum fuel control and accuracy. ECU monitors and controls the engine. It continuously monitors engine conditions and adjusts the fuel delivery accordingly to ensure optimum performance and emissions.

The new engine comes with an after treatment system. The system operates automatically. The exhaust filter consists of a diesel particulate filter (DPF) which captures particulate matter (PM) contained in the exhaust gas. Using a natural cleaning process, most of the PM trapped in the exhaust filter is eliminated by the heat of the exhaust stream generated by normal use. In situations of low temperature, engine speed or load factor, an active cleaning cycle is initiated. In this cleaning cycle, the exhaust gas temperature is raised by injecting additional fuel during the exhaust stroke of normal vehicle operation to the diesel oxidation catalyst (DOC).

After many hours of use, the exhaust filter may require an ash removal service.

epending on the load that the tractor is under, as well as ambient temperature, humidity, and engine speed, the DPF may build up with particulate matter, thus requiring cleaning. Filter cleaning is determined by one of three conditions:

• A prescribed time-based estimation of needed filter cleaning
• DOC/DPF pressure sensors
• A particulate matter buildup estimation based on load conditions

Once one of the three conditions has been met, filter cleaning will occur.

There are three different types of filter cleaning processes:

• Passive filter cleaning
• Active filter cleaning
• Parked filter cleaning

Passive filter cleaning

Passive filter cleaning occurs naturally when the engine is generating enough heat to oxidize particulate matter. This automatic process occurs continuously during normal operating conditions. No tractor icons or symbols appear on the display during passive filter cleaning.

NOTE: Passive filter cleaning requires no operator involvement, and there is no interruption to tractor operation.

Active filter cleaning

If conditions (temperature, load, or speed) for passive filter cleaning cannot be achieved, then PM is removed using active filter cleaner.

To achieve the required conditions, exhaust temperature management (ETM) manages the initiation and duration of active filter cleaning. ETM can adjust numerous engine parameters and/or inject a small quantity of fuel into the exhaust stream for a short duration. The fuel turns to vapor and chemically reacts with the catalysts in the DOC to create heat to oxidize PM.

It is important to note that at no time is the fuel in the DOC/DPF ignited, and there is no flame within the DOC/DPF.

Like passive filter cleaning, active filter cleaning requires no operator involvement, and there is no interruption to tractor operation.

Parked filter cleaning

In some instances where passive and active filter cleaning have not fully cleaned the PM from the system, a parked filter cleaning may need to take place. Most likely, the only time a parked filter cleaning will need to occur is when automatic filter cleaning has been disabled for an extended period of time and multiple warnings to engage filter cleaning were ignored or if the tractor has been used during light load conditions. Additionally, when the automatic filter cleaning process has been deliberately interrupted multiple times, or if active filter cleaning has failed numerous times due to a failed component, a parked filter cleaning may be requested. In these rare instances the operator will have to park the tractor and start the filter cleaning process.

The parked filter cleaning process needs to be activated based on usage and operation of the tractor. The process will take approximately 30 minutes. See operator’s manual for more details.

This system constantly monitors the soot level of the tractor, making sure the tractor is always in peak performance condition. This ensures high performance at all times.

• PowrReverser™ transmission allows for clutchless direction changes

The 12/12 PowrReverser transmission is available on the 4M and 4R Tractors.

The PowrReverser transmission offers a hydraulically shifted forward-to-reverse transmission. This allows for clutchless shuttle shifting between forward and reverse with one lever for quick and easy direction change.

• PowrReverser transmission does not require the operator to use the clutch to shift between forward and reverse

The PowrReverser transmission features a hydraulically actuated wet clutch. Two multi-disk clutch packs (one forward and one reverse) are hydraulically engaged when the directional (reverser) lever is placed in either the forward or reverse position.

Each clutch pack consists of three large, 5-in. diameter clutch disks that operate in oil and are oil-cooled, allowing excellent heat dissipation and extended clutch life.

Key features of the PowrReverser transmission:

• 12 forward/12 reverse (12F/12R) speeds
• Reverser lever, located on the left side of the instrument console, allows the operator to make direction changes without clutching
  • Fast shuttle shift for improved loader operation
• Dual-cone synchronizers allow for synchronized shifts between gears for on-the-go shifting with the use of the clutch
• Dual-cone synchronizers permit on-the-go, low-effort shifting between gears
• Helical-cut gears for quiet operation

• Operator station is comfortable and convenient

The operator's station is designed for easy entry and exit from the tractor.

Conveniently placed brake pedals, as well as repositioned operator controls, provide for a clean and flat platform design giving the operator plenty of legroom.

• Hood and fenders are made from composite polymer material designed to eliminate the possibility of rusting and resistance to dents that can occur with metal hoods and fenders. This material provides a high-luster appearance with excellent resilience and resistance to fading from sunlight.
• Easy-fold rollover protective structure (ROPS), with built-in, rattle reducing, tension rod.

Key features of the operator's station include:

• Marine-grade vinyl seat
• Large grab handles on each fender make getting on and off the tractor easy
• Foot platform is rubber mounted and incorporates a rubber mat for operator comfort
• Center console and fender toolboxes provide ample storage
• Large cup holder on right-hand fender
• Fender-mounted forward work lights (two lights)