2025 John Deere - Lawn Z320M 

• Mow up to 2 acres
• 21.5 HP* (16 kW) V-Twin engine
• 42-in. (107 cm) Accel Deep™ Mower Deck
• 20-inch (50.8 cm) high-back custom-tailored seat and standard rear hitch
• 3-year/200-hour bumper-to-bumper warranty**

Features May Include: 

• Premium engine is powerful, reliable, and durable

A 21.5-hp (16.0-kW) V-twin engine with 44.3-cu in. (726-cc) displacement provides plenty of power and torque to handle tough mulching, mowing, and bagging conditions:

• V-twin cylinder design for greater torque, lower vibration, and improved sound quality
• Full-pressure lubrication and cast-iron sleeves to extend engine life
• Engine model FR651V
• Rear engine guard protects the engine from damage

Simplify maintenance with oil-drain tube and easy-to-access air, fuel, and oil filters. Oil drain tube can be opened without tools and used to direct the used oil into a catch pan.

• Get an even cut with the 42-in. (107-cm) Accel Deep™ (42A) Mower Deck

The 42-in. (107-cm) Accel Deep Mower Deck is a stamped-steel, deep, flat-top design that delivers excellent cut quality, productivity, cleanliness, durability, and versatility. Optimal performance and dispersion of clippings is provided, even at faster mowing speeds or in tall grass:

• 4.97-in. (12.6-cm) deep throughout the entire deck shell for optimum mowing, mulching, and bagging performance
  • Optional MulchControl™ system provides superior mulching performance and versatility
• Stamped-steel design eliminates sharp edges and corners where material can build up and diminish mowing performance
• Mower deck suspended from the vehicle for a smooth and level cut
  • Adjustable mower wheels, positioned just above ground level, help reduce scalping
• 0.25-in. (6.4-mm) cut-height increments allow the mower to be set at the desired cut height
• Compatible with efficient 6.5-bu (230-L) two-bag cut-and-throw material collection system

Deep mower-deck stamping gives excellent cut quality. It allows the cut and suspended material room to exit the deck without getting recut:

• Reducing the amount of recutting enables more power to be used to cut incoming grass, which greatly improves mower capacity.
  • Helps maintain excellent cut quality at faster mowing speeds
• Clean flow of material out of discharge area prevents cut material from interfering with cutting the incoming grass, making it possible for the blades to cut incoming material cleanly.
• Even in mulching mode, cut evenness is improved compared to other designs because the additional depth allows for continuous circulation, optimal recutting, and an even distribution of clippings.

Deep mower-deck stamping gives high productivity, which gets the job done fast. It allows the cut and suspended material room to exit the deck quickly, reducing the amount of recutting so more power is available to process incoming grass:

• Greatly improves the mower's capacity to maintain excellent mowing performance in difficult mowing conditions and at higher speeds

Large discharge opening is both high and wide to handle more material:

• Gives a smooth, even discharge of clippings at all mowing speeds
• Reduces the chance of plugging, especially important when operating in wet, thick, or dense grass and when bagging
• Cut-and-throw chute has a large, optimized inlet which aids in collecting material by using airflow from the large deck opening

The flat-top shape of the deck stamping is optimal for keeping itself and the operator clean:

• There are few places to catch and hold material on the top and underneath the deck.
  • Top of deck stays cleaner, reducing time and effort needed for cleaning and service
  • Underside of deck is self-cleaning to maintain optimum performance without build-up of material to interfere with the flow of air and clippings
  • Less need to clean and remove build-up of material from underside deck
• The depth of the Accel Deep Mower Deck minimizes the amount of material that escapes from the front of the deck
  • Limited amount of material to drift onto the operator and mower deck
  • Even flow of material discharged out the chute, less recutting results in larger pieces that are less likely to end up on the operator
  • Mulching prevents the discharge of material completely and MulchControl makes mulching a practical solution for most mowing situations.

Cleaning a mower deck, both top and bottom, is one of the most frequent maintenance activities:

• The flat-top design reduces places for material to build up and makes material that does collect easy to remove.

MulchControl option

The MulchControl system for the 42A Mower Deck is an optional field-installed attachment and makes mulching practical for many mowing situations because it not only does an excellent job of mulching, but it also allows the mower to be easily converted for times when it is more desirable to side discharge or collect the lawn material. Advantages of mulching grass clippings include:

• A beautiful looking lawn
• Grass clippings not blown onto the operator, driveways, or flower beds
• Less fertilizer use
• Elimination of the effort needed to dispose of clippings

A wash port is provided to make cleaning the underside of the mower deck easy.

• Hose connector is included with the mower deck.

The 42A Mower Deck has strong spindle pockets, to keep the blades aligned, even after years of tough service:

• Ribs in the deck shell add strength where it is needed.
• The 42A has a 16 percent heavier overall weight than the Edge™ Xtra 42-in. (107-cm) Mower Deck that it replaces.

Mower wheels are double captured:

• Provides greater strength and durability for longer, trouble-free life.
• Single-bolt adjustment makes setting wheels to the correct height for the cutting height quick and easy.

Low-tension belt-drive design reduces the side load on the engines lower bearing and mower deck bearings for longer life.

Rolled outer edge of the deck provides extra strength and protection.

Dual-stage E-coat and powder-paint coatings provide extra protection from rust.

• Comfortable ride delivered by operator station with adjustable controls and seat position

The operator station is designed for operator comfort and convenience when operating all controls:

• Excellent visibility forward and to the trim side of the deck makes operation easy and comfortable for the operator.

• Controls are color coded for easy identification.

• Translucent fuel tank displays fuel level.

• Twin-lever controls adjust, using cut-height pin/socket, for convenience and operator comfort.

• A shock absorber dampens motion control lever movement to give smooth operation.

The M- and R-Series mowers have a cut-and-sewn seat with:

• 20-in. (51-cm) of height
• Thick foam to soften bumps
• Side-bolstering to stabilize the operator on uneven terrain
• Embroidered John Deere logo and green accents
• Standard armrests on R-Series models (armrests are optional on M-Series models)

Two steel coil suspension springs under the seat absorb shocks when traveling over rougher areas to provide a smoother ride. The seat fore-aft position can also be changed without tools.

The cup holder is designed to hold common cup sizes securely.

A storage compartment provides a place for the operator to keep safety equipment, a cell phone, etc.

Large foot platform helps the operator remain comfortable and secure:

• Volcano grips give a secure grip.
• Raised footrests at the front of the platform provide a comfortable area for the operator's feet.
• An attractive floor mat is standard on R-Series models and optional on M-Series models.

• Convenient maintenance is supported by trusted self-service resources

John Deere riding lawn mowers are equipped with a QR code label that links to an owner support website. The label can be found on the rear fender, to the left of the seat.

The owner support website is formatted for smart phones and available without setting up an account and password. The QR code includes the mower’s serial number, enabling the owner support website to provide a maintenance schedule, service parts, attachments, how-to guide, videos, warranty information, and an operator’s manual for the specific mower.

The owner support website also allows users to purchase service parts, schedule dealer service, purchase extended warranties, and download the Equipment Mobile app. The Equipment Mobile app enables users to maintain a shared digital service record with their dealer.

A convenient service interval decal provides basic maintenance information. It provides a quick reference for keeping recommended service up to date.

The footrest area is hinged and easily raised for service to mower deck:

• No tools are needed to lift footrest
• Easy to clean grass off the top of the mower
• Provides convenient access to the mower drive

The engines are easy to service, including changing the oil and the oil filter and servicing the air filter.

Accel Deep Mower Decks have several features that make them easy to service:

• Flat-top design minimizes places for debris to collect.
• Spring-loaded, flip-up belt guards make removing debris easy.
• Provision is provided for a standard, 3/8-in. (9.5-mm) ratchet wrench to be used for releasing belt tension when removing the drive belt.

Tie-down locations are provided for convenience and safety when trailering the machine.

• Easy-to-find-and-use instruments and controls

The motion-control levers can be adjusted to three different height settings and eleven different fore-aft settings: 

• Increased operator comfort
• Adjustable for more precise control of the machine

A standard shock absorber for the motion-control levers makes maneuvering ZTrak™ Mowers easy and comfortable:

• Shock absorber modulates the movement of control levers for smoother operation.
• Operator can smoothly and precisely control the machine.

On-board tracking adjustment from the operator seat is quick and easy. The included 13-mm wrench is used for adjusting tracking and the motion-control lever position.

The operator control panel is conveniently located and easy to use. The following instruments and controls are included:

• Hour meter
• Ignition switch
• Power take-off (PTO) control
• Engine speed/choke control
  • A choke position is built into the engine speed control (E-Series models).
  • A separate choke lever is used (M- and R- Series models).

The integrated park brake is automatically applied when steering levers are stowed outward and disengaged when motion control levers are placed into operating position.

• Easily lift the mower deck using the foot lift pedal.
• A cut-height preset ensures the deck returns to the correct position.
• Mower deck cutting height adjusts from 1.25 to 4.5 in. (3 to 11 cm) in 0.25-in. (0.64-cm) increments for excellent cut quality and performance.

The foot-lift pedal also provides a convenient way to temporarily raise the mower deck over an obstruction while mowing.

A heavy-duty electric PTO clutch is controlled by a convenient, dash-mounted control. The PTO clutch is designed to operate through many on/off cycles.

Motion-control levers are designed for comfortable and easy operation.

A shock absorber is included to dampen the movement of the control levers so any operator can make smooth, controlled turns.

Pneumatic caster wheels give a smoother ride and easier steering:

• Large 11x6-5 front caster wheels provide extra ride comfort and better steering control.
• Caster wheels have sealed bearings for long life and easy steering.

• Motion-control levers must be in the outwar
• Seat interlock switch disengages the mower when the operator leaves the seat.
• Engine will stall if the operator leaves the seat without the motion-control levers in the outward position and the park brake set.
• d position for the engine to crank.

LED lighting provides additional lighting when needed.

• Forward LEDs light the front of vehicle, mid LEDs illuminate the front and side of the mower deck
• Standard R-Series model, optional on E- and M-Series models
• E- and M-Series models include wiring to speed installation