John Deere Z994R Diesel ZTrak™ Zero-Turn Mower

Right angle gearbox with cooling fins and fan

Illustration of unitized pump and wheel motor drives

A right-angle gearbox is used to convert power from the horizontal shaft diesel engine to vertical shaft power to operate the vehicle transmission. Cooling for the gearbox is provided by fins on the gearbox housing and a fan.

The hydrostatic drive included with the Z994R features two 13-cc (0.8-cu in.) unitized hydraulic pumps combined with commercial-grade, heavy-duty, 13-cc (0.8-cu in.) wheel motors into a single unit. The drive units feature cross porting, where the hydraulic fluid from the side doing the least work is filtered and then fed into the input of the side doing the most work. This ensures that the coolest fluid is going into the side working the hardest in order to provide the best performance during extended hillside operation in the same direction.

One pump and motor drive assembly for each wheel provides the following benefits:

• Exceptional cooling, even in high-load conditions
• Easy-to-check level and refill hydraulic oil
• Opens up access under the seat

Transmission fluid tank fill cap

Motion-control levers (shown in operating position)

One transmission oil reservoir is used for both of the unitized transmissions.

Motion control levers are designed for operator comfort and ease of controlling vehicle speed and direction.

Motion-control lever height adjustment bolts

Motion-control lever gap (1) and tracking (2) adjustments

Motion-control lever adjustments include:

• Two height positions to suit the operator.
• Control lever fore/aft position to suit operator size and preference.
  • Slots in control levers allow forward/rearward adjustment of control arms when the bolts are loose.
• Gap between the control levers adjustment (1).
• From-the-seat tracking adjustment (2), operators can mow straight and produce professional striping results.

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

Right-hand control panel

Instrument panel

Hour meter, monitoring, and diagnostic display

Controls are grouped on the right console, providing one central location for key switch, engine speed control, power take-off (PTO) engagement, height-of-cut adjustment, hour meter, and engine diagnostics.

The comprehensive display tells when oil changes and other maintenance should be performed, monitors vehicle function, and helps diagnose common downtime issues:

• A service reminder feature will indicate that a general lubrication or mower/engine service interval has been reached.
• When service is required, arrows will periodically flash for two hours.
• Other features include:

• Hour meter
• Engine overheat warning light
• Battery/alternator warning light
• High transmission oil temperature warning light
• Glow plug on indicator light
• Maintenance needed indicator light
• Low engine oil pressure warning light

Foot pedal Brake & Go starting system and mower lift

Brake & Go pedal

Mower lift pedal

The Brake & Go starting system is a John Deere exclusive. This feature makes the starting process easier:

• The Brake & Go starting system is easy to understand and use.
• To start the machine, the parking brake must be engaged.
• It does not matter whether the PTO switch is on or off, nor does it matter if the control levers are pulled in or extended out.
  • As long as the parking brake is engaged, the machine will start. When the parking brake is applied, the control levers cannot be moved.
• Park brake engagement returns motion-control levers to the neutral position.

A foot pedal is used to raise the mower deck to adjust cut height or lock the mower deck in the transport position:

• A foot pedal is easier for many operators to use than a hand lever.
• Adjustable spring assist allows fine-tuning lift effort to the mower and the operator.

Motion-control levers

Motion-control levers in use

Motion-control levers in park position

Two hydrostatic control levers are designed for operator comfort and control:

• Allow the operator to select the ground speed and direction simply by moving levers forward or reverse
• Positive neutral lock position for levers provides added safety

The wide-bend, large-diameter steering levers swing out easily for entry and exit from the operator platform.

Motion-control lever and tracking adjustments

Motion-control lever height and fore/aft adjustment bolts

Motion-control lever gap (1) and tracking (2) adjustments

Motion-control lever adjustments include:

• Two height positions to suit the operator.
• Control lever fore/aft position to suit operator size and preference.
  • Slots in control levers allow forward/rearward adjustment of control arms when the bolts are loose.
• Gap between the control levers adjustment (1).
• From-the-seat tracking adjustment (2), operators can mow straight and produce professional striping results.

Cut-height adjustment

Mower deck height adjustment knob

Transport lock knob

An easy-to-use height-of-cut adjustment lift system allows the operator to quickly adjust deck height for different mowing applications as well as transport:

• An easy-to-use cutting-height lift system allows the operator to adjust the mower deck height with no tools and minimal effort.
• The easy-to-grip knob allows operators to dial in the desired height of cut (HOC).
• Cutting height can be adjusted from approximately 1 in. to 5.5 in. (2.5 cm to 14 cm).
• Rotate the knob to adjust from 1 in. to 5.5 in. (2.5 cm to 14 cm) in 0.25-in. (0.64 cm) increments.
• Each increment on the knob adjusts the HOC approximately 0.25 in. (0.64 cm).
• The deck can also be raised and locked in a transport position to provide maximum ground clearance when moving the machine from one area to another.

The transport lock function allows the deck to be locked in the transport position and returned to the previous HOC.

• Use the foot-lift pedal to lift the deck, then engage the transport lock.
• To unlock and lower the deck, simply pull up on the transport unlock knob, adjust the dial, and release the deck lift assist pedal to lower the deck to the chosen height.

This design increases productivity by allowing operators to change the cutting height without having to leave the seat.

Z994R ZTrak™ Mower with optional dump-from-seat material collection system

Z994R ZTrak Mower

Attractive styling incorporates a roomy and uncluttered operator platform with adjustable footrest, seat, and steering control positions for different operator preferences. Other well-thought-out features further contribute to good looks and operator comfort.

The frame is made of heavy-duty formed and welded steel for strength and reliability.

Formed and welded steel frame

Z994R ZTrak Mower

Z994R ZTrak Mower

A strong, welded steel frame provides solid, reliable support for the machine components and operator:

• Heavy-duty, 7-gauge, 0.179-in. (4.55-mm) 1.5x3-in. (38x76.2-mm) steel tubular frame for durability
• Wide-open access for maintenance and cleaning
• Rear frame provides solid support and protection for the engine

Front axle and offset caster wheels

Front axle and caster wheels

Cast I-beam caster arm and spindle assemblies handle the beating and pounding professional mowers receive.

Caster wheels are offset for optimum steering and mowing performance. Benefits include better inside-corner trimming performance and less chance of between-blade striping.

Rear bumper provides protection

Z994R rear bumper

Optional rear hitch

A steel rear bumper provides protection for the machine.

A rear hitch can be added to the steel bumper for towing purposes. The Z994R can tow up to 400 lb (181.4 kg).

Z994R with fully-adjustable suspension seat option and 72-in. (183-cm) mower deck

Reinforcement welded on left end of mower

There are four mower-deck options available for the Z994R Diesel ZTrak™ Mower:

• The 54-in. (137-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 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.

54-in. (137-cm) 7-Iron PRO Mower Deck

Similar 60-in. (152-cm) 7-Iron PRO Mower Deck shown

Features include:

• Higher blade tip speed of 18,000 fpm (5486 m/min) gives more blade strikes per distance of forward travel.
• The front baffle is designed to better manage airflow and control clippings.
• Spindle-pocket reinforcement provides even greater structural durability.
• A raised discharge chute allows for even clipping distribution.
• Thick, 7-gauge, 0.179-in. (4.55-mm) steel construction gives commercial durability.
• The three-spindle design provides a smooth, even cut.
• A plastic discharge deflector reduces damage to foliage and resists bending.
• The formed, steel-deck design is stamped from a single sheet of steel to eliminate corners where grass can collect.
• The deep deck gives increased vacuum action that reduces dropped clippings.
• The belt drive efficiently transfers power from gearbox to spindles.
• Spindle grease fittings are on top for easy access.
• Quick-change cutting-height adjustment is easy to use.
• Blade overlap of 1.57 in. (40 mm) reduces the number of missed grass blades.
• A mulching attachment is available.
• The Power Flow™ rear material collection system is available.

60-in. (152-cm) 7-Iron PRO Mower Deck

Similar 60-in. (152-cm) 7-Iron PRO Mower Deck shown

Features include:

• Higher blade tip speed of 18,000 fpm (5486 m/min) gives more blade strikes per distance of forward travel.
• The front baffle is designed to better manage airflow and control clippings.
• Spindle-pocket reinforcement provides even greater structural durability.
• A raised discharge chute allows for even clipping distribution.
• Thick, 7-gauge, 0.179-in. (4.55-mm) steel construction gives commercial durability.
• The three-spindle design provides a smooth, even cut.
• A plastic discharge deflector reduces damage to foliage and resists bending.
• The formed, steel-deck design is stamped from a single sheet of steel to eliminate corners where grass can collect.
• The deep deck gives increased vacuum action that reduces dropped clippings.
• The belt drive efficiently transfers power from gearbox to spindles.
• Spindle grease fittings are on top for easy access.
• Quick-change cutting-height adjustment is easy to use.
• Blade overlap of 1.57 in. (40 mm) reduces the number of missed grass blades.
• A mulching attachment is available.
• The Power Flow rear material collection system is available.

Mower deck specifications

Optional three-bag material collection system (MCS)

Three-bag MCS

Standard weight bracket and weights, for three-bag MCS

The 14-bu (493-L), three-bag MCS is available for the Z994R with a 54-in. (137-cm) or 60-in. (152-cm) Mower Deck, or a 60-in. (152-cm) Mulch On Demand Mower Deck. Professional landscape contractors can increase productivity by utilizing this durable collection system. This system allows fast, easy grass clipping and leaf collection to give lawns a well-groomed appearance.

Optional Power Flow blower

Power Flow blower

Power Flow blower in cleanout position

A Power Flow blower is required (ordered separately) for use of a three-bag or dump-from-seat MCS.

The Power Flow blower can be opened for easy and thorough cleanout.

60-in. (152-cm) 7-Iron PRO Mulch On Demand Mower Deck

60-in. (152-cm) 7-Iron PRO Mulch On Demand Mower Deck (shown on Z997R)

Mulch On Demand control lever (shown on Z997R)

Features include:

• The deck can be converted from a wide-open side discharge mode to a fully chambered mulching mode with a single move of a lever.
• Higher blade tip speed of 18,000 fpm (5486 m/min) gives more blade strikes per distance of forward travel.
• The front baffle is designed to better manage airflow and control clippings.
• Spindle-pocket reinforcement provides even greater structural durability.
• A raised discharge chute allows for even clipping distribution.
• Thick, 7-gauge, 0.179-in. (4.55-mm) steel construction gives commercial durability.
• The three-spindle design provides a smooth, even cut.
• A plastic discharge deflector reduces damage to foliage and resists bending.
• The formed, steel-deck design is stamped from a single sheet of steel to eliminate corners where grass can collect.
• The deep deck gives increased vacuum action that reduces dropped clippings.
• The belt drive efficiently transfers power from gearbox to spindles.
• Spindle grease fittings are on top for easy access.
• Quick-change cutting-height adjustment is easy to use.
• Blade overlap of 1.57 in. (40 mm) reduces the number of missed grass blades.
• The mulching attachment is available.
• The Power Flow rear material collection system is available.

72-in. (183-cm) 7-Iron PRO Mower Deck

Similar 72-in. (183-cm) mower deck shown

Features include:

• Higher blade tip speed of 18,000 fpm (5486 m/min) gives more blade strikes per distance of forward travel.
• The front baffle is designed to better manage airflow and control clippings.
• Spindle-pocket reinforcement provides even greater structural durability.
• A raised discharge chute allows for even clipping distribution.
• Thick, 7-gauge, 0.179-in. (4.55-mm) steel construction gives commercial durability.
• The three-spindle design provides a smooth, even cut.
• A plastic discharge deflector reduces damage to foliage and resists bending.
• The formed, steel-deck design is stamped from a single sheet of steel to eliminate corners where grass can collect.
• The deep deck gives increased vacuum action that reduces dropped clippings.
• The belt drive efficiently transfers power from gearbox to spindles.
• Spindle grease fittings are on top for easy access.
• Quick-change cutting-height adjustment is easy to use.
• Blade overlap of 1.57 in. (40 mm) reduces the number of missed grass blades.
• A mulching attachment is available.
• The Power Flow rear material collection system is available.

Optional dump-from-seat material collection system

Dump-from-seat MCS

Standard weight bracket and weights, for dump-from-seat MCS

The durable dump-from-seat MCS for the Z994R ZTrak Mower increases productivity. Professional landscape contractors are able to empty the large, 13-bu (458-L) capacity hopper without leaving the seat. This system allows fast, easy grass clipping and leaf collection to give lawns a well-groomed appearance.

High back suspension seat

Seat and operator station

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

Two seat choices offer exceptional operator comfort

Two seating options are available:

1. Fully adjustable seat with adjustable armrests and ComfortGlide fore/aft suspension
2. Deluxe comfort seat with adjustable armrests, ComfortGlide™ fore/aft suspension, and rubber cushioning springs

All seat options include:

• Factory installation
• 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

ComfortGlide suspension with fore/aft control

Seat easily raised with spring-loaded latch

• ComfortGlide fore/aft suspension for superior ride comfort over uneven areas
• Seat can travel up to 2 in. (50.8 mm) fore and aft to absorb bumps for a significant enhancement to ride comfort
• Ability to easily lock out if desired by the operator
• One lever for three functions
• Slide seat forward and back 3 in. (7.6 cm)
• Activate ComfortGlide fore/aft seat suspension
• Lock-out ComfortGlide fore/aft seat suspension

A spring-type locking mechanism holds the seat securely down in the operating position for operator comfort and safety, but allows quick release for tilting the seat up:

• For protection from the elements
• For access to the transmission fluid reserve tank, battery, etc.

1. Fully adjustable seat with 24-in. (61-cm) high back, armrests and ComfortGlide fore/aft suspension

Fully adjustable suspension seat with armrests and 24-in. (61-cm) high back

Armrest adjustment

The fully adjustable, 24-in. (61-cm) high-back, mechanical suspension seat with adjustable armrests includes:

• Adjustable armrests that can also be raised for operator convenience

Mechanical suspension seat adjustment

Lumbar adjustment lever

• Suspension seat control dial for easy adjustment of suspension to suit the operator
• Adjustable lumbar support for operator preference
  • Lumbar adjustment gives extra operator comfort
  • Adjustment is especially helpful when operating the vehicle for extended periods of time
• Vibration reduction
• Seat back-angle adjustment to maximize operator comfort by using a convenient lever on the side of the seat

2. Deluxe comfort seat with adjustable armrests, ComfortGlide fore/aft suspension, platform isolation, and rubber cushioning springs

Deluxe comfort seat with armrests and isolation

Armrest raised to show adjustment feature

The two-piece, 24-in. (61-cm) deluxe comfort high-back seat has a thick seat cushion for lasting comfort, even after a full day of use:

• Adjustable armrests provide good comfort for the operator.

Armrests can be raised for operator convenience or for making height adjustments for optimum comfort.

Rubber isolation mount

A rubber isolation package with four rubber mounts reduces vibration for a more comfortable ride:

• Provides a good option for operators who do not require the more premium, fully adjustable, mechanical suspension-seat option

Rubber springs

Two 3-in. (7.6-cm) rubber springs under the seat give a more comfortable ride, especially when traveling over rougher areas.

Foot pegs

Foot pegs available standard on R-spec Z900’s

Foot pegs help provide the operator with a comfortable foot placement.

• Location and angle of foot pegs can be adjusted for individual operator comfort.

Foot platform isolators

Foot platform isolators

Foot platform isolators provide the operator with added comfort.

• Vibration to the legs and feet is reduced.

Onboard storage and cup holder

Onboard storage compartment

Cup holder

A convenient storage compartment and cup holder are available within easy reach of the operator.

Folding rollover protective structure (ROPS)

ROPS up position

ROPS midway position

The Z994 ZTrak™ Mower is equipped with a two-post folding ROPS and a retractable seat belt. The folding ROPS enhances operator safety and provides ample clearance when storing the mower in garages or sheds:

• ISO21299 certification

The ROPS system can be repositioned without the use of tools. Under normal operation, the ROPS should be in the up position.

ROPS in the down position (similar vehicle shown)

Retractable seat belt

If operating in low clearance areas, the ROPS can be folded and secured out of the way. It can also be positioned halfway down to accommodate machines equipped with a material collection system.

A retractable seatbelt is provided for operator convenience and safety.

Safety interlock systems

Brake & Go pedal

Motion-control levers (shown in operating position)

The Brake & Go starting system is a John Deere exclusive. This feature makes the starting process easier:

• The Brake & Go starting system is easy to understand and use.
• To start the machine, the parking brake must be engaged.
• It does not matter whether the power take-off (PTO) switch is on or off, nor does it matter if the control levers are pulled in or extended out.
  • As long as the parking brake is engaged, the machine will start. When the parking brake is applied, the control levers cannot be moved.
• Brake & Go operator-presence system returns levers to the neutral position when the brake pedal is actively engaged.

Mower deck safety

60-in. (152-cm) Mower Deck

54-in. (137-cm) Mower Deck

Mower safety features include:

• A high-quality deflector that meets applicable safety standards and disperses cut grass
• Spindle-sheave shielding that protects and is easy to remove without tools for cleaning and service
• A substantial welded-on metal step on the mower deck for safer operator entry and exit from the machine

Mower decks are safety certified

Mowers decks are evaluated by the manufacturer (John Deere Turf Care) and conform to American Nation Standards Institute (ANSI) B71.4 2004 safety certification specifications for commercial turf care equipment.

Michelin X Tweel Turf on Z994R

Flat-free rear tire on ZTrak™ Mower

John Deere leads the commercial zero-turn mower industry with use of the Michelin X Tweel Turf technology.

Michelin is a world leader in tire manufacturing and technology. This airless radial tire solution is an industry first for John Deere, which provides a smoother ride for the operator and additional advantages to John Deere owners.

Advantages of the Michelin X Tweel Turf include:

• Mowing performance is improved.
  • Rutting is reduced because the Michelin X Tweel Turf has more support across the surface for improved flotation and better ground contact.
  • Unique energy transfer within the poly-resin spokes reduces the bounce associated with pneumatic tires, to give a smoother ride.        
  • Excellent curb climbing is possible due to the Michelin X Tweel Turf construction and flexibility.
  • More consistent cut quality is achieved because inconsistent tire pressure is eliminated.
• Uptime is improved.
  • The exclusive technology eliminates downtime and associated cost due to flat or damaged tires. Punctures and sidewall damage no longer result in downtime.
• Cost of operation is reduced.
• Cost of repairs and maintenance is reduced. One single unit replaces the current tire, wheel, and valve assembly. There is no need for complex tire-mounting equipment.
• No need to spend time checking and optimizing tire pressure.
• The need to purchase and stock plug kits and spare tires is eliminated, particularly for professional landscape contractors and government agencies who normally stock them.
• The tire tread will last up to three times longer than current pneumatic tires because automotive-grade rubber is used for the tread.

Michelin X Tweel Turf

Michelin X Tweel Turf on Z994R

Heavy-duty construction provides the ultimate in performance and reliable operation:

• High-strength poly-resin spokes carry the load.
• Four-hole, heavy-duty steel hub easily bolts onto any Z994R ZTrak Mower.
• Deep, open-tread design provides excellent cleaning and traction.
• Zero degree, high-tensile proprietary carcass provides great lateral stiffness while resisting damage from impact and penetration.

Tires deliver exceptional traction, maneuverability, and reliability

Run flat front caster wheel

Pneumatic rear drive wheel

The ZTrak Z994R Mower is equipped with 13x6.5-6 run flat front caster tires that provide:

• Excellent reliability and uptime
• Low center of gravity to increase hillside mowing capability
• Caster wheels and caster wheel towers with sealed bearings for long life and easy steering
• Offset front caster wheels to help improve the inside corner-trim performance and reduce between-blade striping

A choice of rear wheel options is available for factory installation:

• 24x12-12 4 PR pneumatic drive tires in base equipment for excellent traction, flotation, and curb climbing
• 24x12-12  Michelin X Tweel Turf airless radial tire technology option for a smoother ride and more uptime

Michelin, X, and Tweel are trademarks of Michelin North America, Inc.

3-cylinder diesel engine

Access to engine service points

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.

Radiator coolant reservoir

Engine oil filter, dipstick, and fuel filter/water separator

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.

Removable floor panel

Floor panel removed for mower access (similar Z970R shown)

The floor panel is easily removed, without tools, to give access to the top of the mower deck for cleaning and service.

All mower deck blade spindle grease fittings can be accessed from the top of the mower deck.

Battery and transmission fluid reservoir access

Flip-up seat

Service access with seat in raised position

The seat is locked down for operator comfort and safety, but the spring latch system is easily released to raise the seat to protect it from the elements and give access to the battery, transmission fluid reservoir, etc.

Battery

Sealed fuse and relay box

• Maintenance free, 600 cold-cranking amp (CCA) battery is provided for fast, reliable engine starts.
• Electrical box is sealed to keep dirt and moisture out for reliability and ease of service.

Motion-control lever and tracking adjustments

Motion-control lever two-position height adjustment

Adjustments for fore-aft position (1) and tracking (2)

Motion-control lever adjustments include:

• Two height positions to suit the operator
• Control lever fore/aft position to suit operator size and preference
  • Slots in control levers allow forward/rearward adjustment of control arms when the bolts are loose.
• Gap between the control levers adjustment (1)
• From-the-seat tracking adjustment (2) so operators can mow straight and produce professional striping results

Service information and diagnostics

Service information label

Digital multi-function display

A digital multifunction display shows the number of hours the machine is run when the key switch is in the on position. It only counts the hours the engine is actually running. Monitoring systems to notify operators of machine status and quickly diagnose common downtime issues include:

• Glow plug monitor
• Maintenance required notification
• Low oil pressure
• Hour meter
• Coolant overheat notification
• Battery charging system
• High engine oil temperature

Optional service jack kit and jack

Jack kit and jack installed

Jack in storage position

The Z994R front frame member is pre-drilled to accept the optional jack kit and jack:

• The jack makes servicing the underside of the mower deck safer and easier.
• Placed in the storage position, the jack can be carried on the machine, always available for use.
  • The jack will need to be removed when using front ballast that is required for a rear material collection system.

Three-year, 1500-hour bumper-to-bumper warranty

Z994R ZTrak™ Mower

Z994R ZTrak Mower

An exclusive two-year, unlimited hour/three-year, 1500-hour (whichever comes first) bumper-to-bumper warranty is standard on the Z994R. The warranty is best in the industry and puts John Deere at the forefront of commercial mowing. It is also hassle free, with one company handling all of the paperwork.

NOTE: The warranty covers 36 months or 1500 hours, whichever comes first. For the first 24 months, there is no hour limitation.

3-cylinder diesel engine

Access to engine service points

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 eliminates 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

Heavy-duty air cleaner

Air cleaner 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

Radiator

Radiator cover

Radiator cover knob

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.

Radiator shown with debris screen removed

Radiator and electric cooling fan

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.

Radiator debris screen

Close-up of radiator debris screen

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.

The debris screen can be easily removed for cleaning, if desired, and also for access to the radiator fins.

Fuel tank

Fuel tank and angled fuel filler cap

Diesel fuel cap and fuel gauge

The Z994R Diesel ZTrak™ Mower is equipped with a single 11.5-U.S. gal. (43.5-L) fuel tank that provides enough capacity to allow mowing for a full day without refueling:

• Large, angled filler neck makes for easier refueling
• Fuel cap tether is provided to secure the filler cap while refueling
• Fuel gauge is provided as standard equipment

NOTE: The fuel fill level is 1 in. (25 mm) below the bottom of the filler neck.

Gearbox cooling fins and fan

Cooling fins and fan for right-angle gearbox

A right-angle gearbox is used to convert power from the horizontal shaft diesel engine to vertical shaft power to operate the vehicle transmission and the mower power-take off clutch. Cooling for the gearbox is provided by fins on the gearbox housing and a fan.