The 2025 John Deer 4066R is the flagship model of the 4R series. It is a premium compact utility tractor designed for heavy-duty tasks where a high power-to-weight ratio is required. It is notably a “No-DEF” machine, meeting Tier 4 Final standards using only a Diesel Particulate Filter (DPF).¹

Below are the direct technical specifications for the 2025 model:

Engine & Power

• Engine: Yanmar 4TNV86CHT-MJT, 4-Cylinder, Turbocharged Diesel²

   

• Displacement: 127.6 cu. in.³ (2.09 L)

   

• Gross Horsepower: 65.9 HP @ 2,600 RPM⁴

   

• PTO Horsepower: * eHydro: 52.0 HP⁵

   

  • PowrReverser: 54.0 HP⁶

     

• Emissions: Final Tier 4 (FT4) / Stage V (No DEF required)⁷

   

• Engine Torque: 131.3 lb-ft at rated speed⁸

   

• Fuel Capacity: 13.8 gal (Cab) / 15.0 gal (ROPS)⁹

   

Transmission & Drivetrain

• Standard Transmission: eHydro™ (3-Range Electronic Hydrostatic) with Twin Touch™ pedals.¹⁰

   

• Optional Transmission: 12F/12R PowrReverser™ (Mechanical shuttle).¹¹

   

• eHydro Controls: Includes LoadMatch (anti-stall), MotionMatch (adjustable coasting), SpeedMatch (low-speed cruise), and eThrottle (RPM follows pedal travel).¹²

   

• Drive Type: 4WD (MFWD) with planetary final drives.¹³

   

• Brakes: Multi-plate wet disc.¹⁴

   

Hydraulics & Hitch

• System Type: Open Center, dual gear pump.¹⁵

   

• Total Pump Output: 17.4 GPM (65.8 L/min)¹⁶

   

  • Implement Flow: 11.2 GPM (42.3 L/min)¹⁷

     

  • Steering Flow: 6.2 GPM (23.5 L/min)¹⁸

     

• 3-Point Hitch: Category 1 (Standard with Hitch Assist for easier hookups).¹⁹

   

• Lift Capacity (at ends): 3,130 lbs (1,420 kg)²⁰

   

• Lift Capacity (24″ behind): 2,500 lbs (1,135 kg)²¹

   

• Remote Valves: 3 standard mid-valves (controlled by joystick); optional rear remotes.

Dimensions & Weight

• Wheelbase: 73 in (185 cm)²²

   

• Overall Length: ~142 in

• Height (Top of Cab): 97.4 in

• Weight (Approximate Shipping):

  • ROPS (Open Station): 3,770 lbs²³

     

  • Cab: 4,675 lbs²⁴

     

• Axle Capacity: 3,528 lbs (Front) / 5,292 lbs (Rear).²⁵

   

Performance Matched Loader (440R)

• Max Lift Height: 110.2 in (at pivot pin)

• Lift Capacity: 2,285 lbs (at pivot pin)

• Breakout Force: 3,452 lbs