2025 John Deere R Series Zero Turn Mowers Z997R Diesel 72 in 7Iron™ PRO

2025 John Deere R Series Zero Turn Mowers Z997R Diesel 72 in 7Iron™ PRO

• 37.4 HP (27.5 kW)

• Biodiesel (B20) compatible

• Tier 4 compliant

• 7-Iron™ PRO deck

• Rear Discharge Deck Available

Features may include:

The Z997R is powered by a 3-cylinder, liquid-cooled diesel engine with a gross 37.4 hp (27.5 kW) that meets U.S. Environmental Protection Agency (EPA) Final Tier 4 emission standards. The engine achieves Final Tier 4 compliance by using a diesel oxidation catalyst with diesel particulate filter (DOC/DPF) system.

The three-cylinder diesel engine features low noise levels, superior fuel economy, and a high torque reserve that provides plenty of power and performance.

Key features of the engine include:

• Economical, cast-in block cylinder design gives good cooling and long life.

• Liquid-cooled design provides more consistent operating temperatures than air-cooled.

• Direct fuel injection is provided.

• Injects fuel directly on top of pistons for more efficient combustion

• Develops more horsepower per gallon of fuel

• Improves starting

• Aluminum alloy pistons with built-in steel struts are lightweight to reduce connection rod bearing loads and provide good heat-transfer characteristics.

• Design permits tighter tolerances and neutralizes expansion of the piston, thereby reducing blow-by fuel and noise from the piston slap

• Higher top rings on the piston and a thinner head gasket greatly reduce the volume of unburned waste and increase combustion efficiency

• Timing gears and injector drive gears utilize helical profile gears to help lower engine noise.

• Gear teeth have a newly designed ''roll-off'' profile, giving almost no clash, no noise, and no backlash

• Fuel filter with replaceable element is provided.

• Full-pressure intake manifold provides quick starts in temperatures down to 0°F (-18°C).

• Auto-bleed fuel system gives extra convenience.

• No need to prime the system if the unit runs out of fuel; the system will self-prime the injection pump, lines and injectors, providing fast fuel recovery

• Key start and shutoff eliminate fuel shut-off knob; electric solenoid shuts fuel supply off immediately when key is turned off.

• See-through coolant recovery tank permits operator to check coolant level without removing radiator cap.

• Sealed radiator compartment keeps trash and debris on outside of hood.

• Dual-element, dry-type air cleaner with safety element and air service indicator is provided.

• Dual-element design for added engine protection

• Easy to service

• Completely sealed for effective cleaning and 90 to 95 percent of dirt ejected before it reaches the paper element

• Secondary safety element for additional filtering

• Air-restriction indicator to let operator know when the filter needs servicing

• Full-pressure lubrication with full-flow filter lengthens engine life.

• Engine wear reduced by ensuring proper lubrication, even when operating on hillsides or uneven terrain

• Oil filter helps keep oil clean for increased engine life

• Automotive-type alternator (75 amp) provides plenty of charge to the battery.

• Rear-mounted, covered radiator and fan keeps noise away from the operator and is easy to service.

• Isolated engine mounting reduces engine vibration at operator's station for more comfortable operation.