X738

The V-twin, liquid-cooled John Deere iTorque power system with electronic fuel injection (EFI) provides exceptional performance and has the durability to handle commercial-use applications. The John Deere iTorque power system includes a combination of engine features that provide more lugging ability, even cooling, and durability.

iTorque stands for intelligent design (to get a task done efficiently) and torque (good lugging ability). It is used exclusively on gasoline-powered Select Series™ and Signature Series Tractors.

The 25.5-hp (19-kW) liquid-cooled V-twin engine has a large 45.5-cu in. (745-cc) displacement to provide plenty of power and torque for excellent performance in any operating condition. The one-piece hood is hinged to open for convenient engine service.

Key engine features include:

• Liquid cooling
  • Longer engine life
  • Quieter operation
  • Improved fuel economy
• V-twin cylinder design
  • Smoother running
  • Easier starting 
• Overhead valve (OHV) design to provide more efficient airflow for improved combustion
  • More horsepower and torque per cubic inch of displacement
  • Better cooling for longer engine life
  • Reduced oil consumption
  • Improved fuel economy
• Full-pressure lubrication with replaceable oil filter that provides plenty of clean oil for long engine life
• Horizontal crankshaft with a drive shaft connection to the transmission for positive power transfer 
• Aluminum block and cast-iron cylinder liners
  • Efficient heat dissipation
  • Strength and durability with less weight
• Low exhaust emissions to meet U.S. Environmental Protection Agency (EPA) clean air standards
  • Liquid cooling for consistent operating temperatures
  • OHV for efficient lean burn combustion
  • Precise air-to-fuel ratio control with electronic fuel injection
  • Closed crankcase ventilation re-circulates and burns crankcase hydrocarbons
• Oil drain valve with hose and oil filter drip tray for easy, no-mess maintenance
• Electronic ignition for quick, sure starts
• Rubber engine mounts
  • Vibration-free operation
  • Lower noise
• Electric fuel pump ensures positive fuel delivery for fast starts and smooth running
• Solenoid-shift starter ensures that starter stays engaged until key switch is released for fast cold-weather starts

Air intake system

Engine intake air is drawn in through screened panels at the base of the pedestal and on the right and left sides of the tractor hood:

• Cleanest and coolest area of the tractor
• Pre-cleans the air to keep large chaff and debris from entering the radiator or air cleaner
• Easy to clean and service so engine operates at optimum temperature

An inertia-discharge canister with dry-type paper element surrounded by a foam precleaner cleans intake air for long engine life:

• Ejects large dirt particles before they make contact with the filter
• Provides dual protection against dirt entering the engine
• Easily removed for cleaning or replacement
• Recommend the air filter be replaced and the precleaner cleaned annually or every 200 hours, whichever comes first

Electronic fuel injection

Electronic fuel injection (EFI) offers many important performance advantages:

• Immediate starting in hot or cold ambient temperatures or after long periods of seasonal storage
• No choke linkage for the user to operate
• No engine warmup required, so the implement can be engaged immediately after the engine starts
• Greater horsepower and torque responsiveness
• Higher reliability with the elimination of vapor locking, misfiring, run-on, and after-bang
• Automatic altitude compensation
• Delivers fuel precisely
• Reduces the potential for plug fouling

Fuel tank has a large 5.2-U.S. gal. (19.7-L) capacity

A large, 5.2-U.S. gal. (19.7-L) capacity fuel tank holds enough fuel for extended operation between refills:

• Fuel-fill location is on the left fender for easy access, increased safety, fewer spills, and convenience during filling.
• In-tank electric fuel pump supplies ample fuel flow to eliminate vapor lock and ensure quick engine starts, even after months of storage.

Battery and alternator are large capacity

A high-capacity regulated alternator charging system provides plenty of power to quickly recharge the battery and run electrical equipment, such as lights or a sprayer:

• 20-amp alternator is provided as standard equipment on gasoline engines.
• An optional 20-amp auxiliary alternator kit operates in parallel with the standard 20-amp engine-equipped alternator to bring the total of 12-V electric power to 40 amps.

A large-capacity, 340 cold-cranking amp battery provides plenty of cranking power for quick, sure starts in cold weather:

• Mounted at the front of the tractor frame for easy accessibility