2025 John Deere Z994R Diesel

R Series Zero Turn Mowers

This series has just about everything you could want in a zero-turn mower: Comfort & Convenience Package with electronic controls, exclusive Hydraulic Cross-Porting System, Brake-N-Go System that makes for easy starts, and a fully adjustable suspension seat featuring lumbar support.

Features May Include:

• Powerful 24.7-hp (18.4-kW) diesel engine delivers superior performance and efficiency

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 

• Three 7-Iron™ PRO Side-Discharge Mower Deck options give superior performance in every application

There are three side-discharge mower-deck options available for the Z994R Diesel ZTrak™ Mower:

• The 60-in. (152-cm) 7-Iron PRO Side-Discharge Mower Deck is suited to a variety of mowing jobs, including trimming and grooming.
• The 60-in. (152-cm) 7-Iron PRO Mulch On Demand™ Mower Deck can be converted from a wide-open, side-discharge mode to a fully chambered mulching mode with a single move of a lever.
• The 72-in. (183-cm) 7-Iron PRO Side-Discharge Mower Deck is suited to a variety of mowing jobs, including trimming and grooming.

• Exceptional operator comfort begins with a high-quality seat and suspension

Operator comfort was a primary focus in the design of the Z994R:

• Large, open operator station and foot platform with plenty of legroom and room for multiple foot positions
• A choice of seat and suspension options to suit the operator and operating conditions
• Instruments, controls, and storage areas that are easy to see and use
• Three-position rollover protective structure (ROPS) and retractable seat belt for operator safety and convenience
• Thick seat cushion for lasting comfort, even after a full day of use
• Retractable seatbelt for convenience and ease of use
• Springs to isolate the seat base for increased ride comfort

• Instruments and controls are easy to find and use

The contoured dash has clean, attractive styling:

• Controls are located on the right instrument panel for convenience
• Color coded and labeled for easy identification by the operator
• Controls are logically placed and easy to reach on the right-hand control panel
• Functional design of the controls provides good appearance and a comfortable feel

• Serviceability features give convenience and maximize uptime

Frequently accessed service areas such as the air cleaner, radiator screen, and oil check and fill points can be easily accessed from the open engine compartment.

An easy-to-remove rear engine service panel allows access to all engine service points for scheduled service or other maintenance work.

The design of the Z994R makes service components like the engine oil dipstick, oil filter, and fuel filter/water separator easy to see and access:

• Large radiator coolant reservoir and fuel filter/separator reduce service requirements and increase uptime.
• A convenient fuel shutoff is provided on the filter/separator.