2025 John Deere R Series Zero Turn Mowers Z994R Diesel 72 in 7Iron™ PRO

2025 John Deere R Series Zero Turn Mowers Z994R Diesel 72 in 7Iron™ PRO

• 24.7 hp (18.4 kW) liquid-cooled diesel engine

• ComfortGlide™ Suspension on all seat options

• 11.5 U.S. gallon fuel tank (43.5 L)

• 7-Iron Pro Deck

• Rear Discharge Deck

• Mulch On Demand™ Available

Features may include:

The Z994R is powered by a 3-cylinder, liquid-cooled diesel engine with gross SAE J1995, PS 24.7 hp (18.4 kW) rated power at 3200 rpm that meets U.S. Environmental Protection Agency (EPA) Final Tier 4 emission standards:

• High-torque, low-emission diesel engine for strong performance in the toughest conditions

• Low vibration and noise levels

• Isolated with rubber mounts for a smoother operator ride

• Superior fuel economy

• High torque reserve for plenty of power and performance

Key features of the engine include:

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

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

• Fuel filter with replaceable element is provided.

• Indirect fuel injection uses a pre-combustion chamber to give the engine smooth and quiet operation.

• 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.

• 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 ''roll-off'' profile, giving almost no clash, no noise, and no backlash.

• Glow plugs provide quick starts in temperatures down to -18°C (0°F)

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

Air cleaner with secondary safety element and restriction indicator

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

• Dual-element design for added engine protection and easy service

• Completely sealed for effective cleaning

• Ninety to 95 percent of dirt ejected before it reaches the paper element

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

A sealed radiator compartment controls trash and debris. A cover is provided over the radiator, and a cooling fan area controls the flow of air.

Knobs on both ends of the cover hold it in place.

An automotive-type radiator, coolant reservoir, and electric cooling fan are provided to remove heat from the engine coolant:

• The cooling fan is thermostatically controlled so it only runs when necessary.

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

A debris screen with a corrugated shape to give a large surface area covers the intake air side of the radiator to keep the radiator fins clean.