Cub Cadet Ultima ZT1 42 FAB 42-Inch 21.5 HP Kawasaki V-Twin Dual Hydrostatic Zero-Turn Riding Lawn Mower

Product Description

The Cub Cadet Ultima ZT1 42 FAB is a residential zero-turn riding lawn mower engineered to deliver fast mowing performance, precise maneuverability, and a clean, professional-looking cut. It combines a dependable 21.5 HP Kawasaki V-Twin engine, dual hydrostatic transmissions, a heavy-duty fabricated AeroForce cutting deck, and a reinforced tubular-steel frame.

The mower’s compact 42-inch cutting width makes it suitable for medium and large residential lawns where a wider 50-inch or 54-inch zero-turn mower may be difficult to maneuver. Its zero-turn steering system allows the operator to mow closely around trees, landscape beds, fences, pathways, and other obstacles while reducing the amount of trimming required afterward.

Cub Cadet identifies this fabricated-deck version as model 17BIEACEA10. It should be distinguished from other ZT1 42 versions equipped with stamped cutting decks or different engines.

21.5 HP Kawasaki FR651V V-Twin Engine

The Ultima ZT1 42 FAB is powered by a Kawasaki FR651V twin-cylinder OHV gasoline engine. The engine has a displacement of 726cc and a manufacturer-rated output of 21.5 horsepower.

Its V-Twin cylinder configuration provides smoother power delivery and lower vibration than many single-cylinder riding-mower engines. It also supplies dependable torque for simultaneously driving the mower and operating the cutting blades in normal residential grass conditions.

The Kawasaki engine uses a fully pressurized lubrication system with a replaceable automotive-style oil filter. Pressurized lubrication continuously circulates engine oil through critical internal components, supporting reliable operation during extended mowing sessions.

A dual-element air filter helps prevent dust and debris from entering the engine. The outer and inner filtering components should be inspected regularly, especially when the mower is used in dry or dusty conditions.

The engine also includes:

• Electric key starting
• Mechanical governor
• Separate choke control
• Carbureted fuel delivery
• 12-amp regulated charging system
• Replaceable oil filter
• Dual-element air cleaner

The stated horsepower is the engine manufacturer’s certified gross rating. Actual operating power can vary according to engine speed, grass conditions, temperature, maintenance, altitude, blade load, and transmission demand.

3.5-Gallon Fuel Tank

The mower carries up to 3.5 gallons of gasoline, providing sufficient operating capacity for maintaining medium and larger residential properties without frequent refueling.

Actual runtime from one tank depends on:

• Grass height and density
• Cutting-deck load
• Engine condition
• Mowing speed
• Terrain
• Operator technique
• Number of starts and stops
• Use of bagging or mulching equipment

The mower does not include a fuel gauge, so the fuel level should be checked manually before beginning a large mowing job.

Fresh, clean unleaded gasoline should be used. Fuel stabilizer may be required during seasonal storage to help prevent fuel deterioration and carburetor deposits.

Dual Hydrostatic Transmissions

The Ultima ZT1 42 FAB uses two independent hydrostatic transmissions. Each transmission controls one rear drive wheel and responds to the corresponding lap-bar steering lever.

The hydrostatic drive system eliminates manual gear shifting. Travel speed and direction are controlled by gradually moving the lap bars forward or backward.

Moving both lap bars forward drives the mower ahead. Pulling both controls backward moves the mower in reverse. Moving one lever farther than the other causes the mower to turn.

The dual transmission system provides:

• Smooth acceleration
• Continuously variable travel speed
• Independent rear-wheel control
• Precise maneuverability
• Zero-degree turning capability
• No clutch pedal
• No manual gear shifting

The mower can travel at speeds of up to 7 MPH forward and approximately 3.5 MPH in reverse. Slower speeds should be used around obstacles and when cutting tall, wet, thick, or uneven grass.

The hydrostatic transmissions are designed as maintenance-free units. They are not normally serviced through routine fluid changes by the homeowner.

Zero-Turn Lap-Bar Steering

Dual lap-bar steering provides independent control of the rear drive wheels. This allows the mower to complete tight turns and change direction with greater precision than a traditional steering-wheel lawn tractor.

The mower has a zero-degree turning radius, but a true stationary turn should be performed carefully. Aggressive turns on wet, soft, or delicate grass may cause the rear tires to tear or mark the lawn.

Smooth control movements improve:

• Operator comfort
• Turf protection
• Traction
• Steering accuracy
• Cutting consistency

The lap bars also integrate the parking-brake system. Moving the controls outward into the neutral-lock position engages the parking brake.

This model does not use a steering wheel and should not be confused with Cub Cadet’s Synchro-Steer zero-turn models.

42-Inch AeroForce Fabricated Cutting Deck

The mower is equipped with a 42-inch AeroForce fabricated cutting deck designed to produce fine clippings, reduce uncut grass, and provide an even finished appearance.

Unlike a stamped deck formed from a single sheet of steel, the fabricated deck is constructed from welded steel sections. This provides additional structural strength for homeowners who regularly mow larger or more demanding residential properties.

The 42-inch cutting width offers a practical balance between productivity and maneuverability. It can cover more ground than a compact 30-inch riding mower while remaining easier to navigate and store than larger 50-inch or 54-inch zero-turn machines.

Cub Cadet describes the AeroForce deck as being designed to produce:

• Fewer grass clumps
• Fewer uncut stragglers
• Finer clippings
• Increased cutting evenness
• A professional-quality lawn finish

The fabricated deck is one of the main differences between model 17BIEACEA10 and some other ZT1 42 variants.

Twin-Blade Cutting System

Two steel mower blades operate beneath the 42-inch deck. The blades overlap within the deck’s cutting chamber to cover the complete mowing path and reduce strips of uncut grass between them.

The deep deck design creates airflow that lifts grass before cutting and moves clippings toward the side-discharge opening.

Blade performance depends on:

• Blade sharpness
• Correct blade installation
• Deck cleanliness
• Engine speed
• Travel speed
• Grass moisture
• Cutting height
• Deck leveling

Dull blades can tear the grass instead of cutting it cleanly. They may also increase vibration, reduce cutting efficiency, and place additional load on the engine and deck-drive system.

The blades should be inspected regularly and sharpened evenly. Damaged, bent, cracked, or excessively worn blades should be replaced rather than repaired.

Electric PTO Blade Engagement

An electric power-take-off system engages the mower blades using a dashboard-mounted control.

The electric PTO eliminates the need for a manually operated blade-engagement lever. Pulling the PTO switch activates the deck-drive system, while pushing it down disengages the blades.

The blades should be disengaged when:

• Crossing gravel or paved surfaces
• Traveling outside the mowing area
• Loading or unloading the mower
• Approaching people or animals
• Leaving the operator position
• Inspecting the mower

The engine should be operated at the recommended mowing speed when the blades are engaged to maintain proper airflow and cutting performance.

Adjustable Cutting Height

The cutting deck can be adjusted through multiple cutting-height positions. Cub Cadet ZT1 42 configurations generally provide a range of approximately 1 to 4.5 inches, allowing the mower to accommodate different grass varieties and seasonal conditions.

The deck is raised using a foot-operated lift pedal. A dial-style selector allows the operator to choose the desired cutting height.

The system provides up to 15 deck positions for relatively precise height adjustment.

Higher cutting positions are useful when:

• Grass is unusually tall
• Weather is hot or dry
• The lawn surface is uneven
• The grass variety requires additional height
• Avoiding scalping is important

Lower settings can produce a shorter finished lawn when conditions are suitable.

The mower includes anti-scalping gauge wheels that help the deck follow uneven areas and reduce direct contact between the deck edge and the ground.

Side-Discharge, Mulching and Bagging Options

The standard configuration uses side-discharge mowing. Grass clippings are moved through the deck and directed away from the mower through the discharge chute.

The mower can support three grass-management methods:

• Side discharge
• Mulching with an optional compatible mulch kit
• Grass collection with an optional double bagger

The mulch kit closes the deck’s discharge opening and allows the blades to recirculate clippings inside the cutting chamber. The clippings are cut into smaller pieces and returned to the lawn.

Mulching works best when the grass is dry and not excessively tall. A slower mowing speed may be required to produce fine, evenly distributed clippings.

A compatible double bagger can collect grass clippings and leaves. The bagger, collection tubes, mounting hardware, and any required blades are sold separately.

Cub Cadet lists a compatible double bagger for 42-inch and 46-inch decks among the available accessories.

Heavy-Duty Tubular-Steel Frame

The Ultima ZT1 42 FAB is constructed around a continuous 2-inch by 2-inch square tubular-steel frame.

The open-frame design provides structural support while allowing easier access to important components for cleaning, inspection, and maintenance.

The lower frame receives Cub Cadet’s e-coat corrosion-protection treatment. This electronically applied coating helps protect the steel structure against moisture, grass residue, surface wear, and corrosion.

The corrosion-defense system does not make the mower completely rustproof. Grass and moisture should still be removed after operation, and damaged paint or exposed metal should be repaired promptly.

Operator Comfort

The operator station is designed to provide an open, comfortable seating position with easy access to the controls.

Comfort features include:

• High-back operator seat
• Adjustable seating position
• Padded lap-bar controls
• Open step-through frame
• Rubberized floor area
• Cup holder
• Wide foot platform
• Clear view of the cutting area

The open frame makes entering and exiting the mower easier than designs with a central console or enclosed bodywork.

Depending on the exact production version, the mower may include a 20-inch high-back seat. Armrests should not be listed as standard unless they are visibly installed or confirmed for the specific model being sold.

This ZT1 model does not include front caster suspension or a separate suspension platform.

Tires and Traction

Large rear drive tires provide traction and transfer power from the hydrostatic transmissions to the ground. Front caster wheels rotate freely according to the mower’s direction of travel.

Typical ZT1 42 tire specifications include:

• Rear tires: approximately 20 × 8 inches
• Front caster tires: approximately 11 × 6 inches

The turf-oriented tread is designed to provide traction while limiting damage to maintained grass.

Operators should avoid sharp stationary turns because the rear tires may scuff soft or wet turf. Tire pressure should be checked regularly because unequal pressure can affect deck level, steering, traction, and cutting quality.

LED Headlights

Dual LED headlights improve forward visibility in shaded areas and low-light conditions.

The headlights can help the operator identify nearby obstacles, but they do not make nighttime mowing automatically safe. The lawn should remain sufficiently illuminated to identify people, animals, holes, slopes, debris, and property boundaries.

Rear Hitch

A factory-installed rear hitch allows the mower to pull compatible light-duty lawn attachments.

Possible accessories include:

• Small utility cart
• Lawn sweeper
• Spreader
• Dethatcher
• Light-duty aerator

Only equipment compatible with the mower’s hitch and towing limitations should be used. Added weight can affect steering, traction, stopping distance, stability, and hydrostatic transmission temperature.

Passengers should never be carried on the mower or in a tow-behind cart.

Maintenance Requirements

The Ultima ZT1 42 FAB requires regular gasoline-engine and cutting-deck maintenance.

Routine service includes:

• Checking engine-oil level
• Changing engine oil
• Replacing the oil filter
• Inspecting and cleaning the air filter
• Replacing the air-filter elements when necessary
• Inspecting spark plugs
• Maintaining the fuel system
• Checking the 12V battery
• Cleaning engine cooling areas
• Inspecting the deck belt
• Inspecting the drive belt
• Sharpening or replacing cutting blades
• Cleaning the cutting deck
• Checking tire pressure
• Testing safety-interlock systems
• Inspecting lap-bar controls
• Checking the parking brake
• Preparing the fuel system for storage

Grass and debris should be removed from the engine area and the top and underside of the cutting deck after use.

The mower should be switched off, the key removed, and the spark-plug wires disconnected before performing blade or deck maintenance.

Intended Use

The Cub Cadet Ultima ZT1 42 FAB is designed primarily for residential lawn maintenance.

It is suitable for maintained grass but is not intended to function as:

• A commercial mower
• A brush cutter
• A field mower
• An agricultural tractor
• An off-road vehicle
• A passenger vehicle

Cub Cadet lists no commercial warranty for the residential ZT1 42 configuration.

Technical Specifications

The 21.5 HP Kawasaki engine, dual hydrostatic drive, 7 MPH forward speed, tubular frame, and 42-inch fabricated AeroForce deck are confirmed for Cub Cadet model 17BIEACEA10.

What’s Included

• Cub Cadet Ultima ZT1 42 FAB zero-turn mower
• Kawasaki FR651V 726cc 21.5 HP V-Twin engine
• 42-inch AeroForce fabricated cutting deck
• Two steel cutting blades
• Dual hydrostatic transmissions
• Dual lap-bar steering controls
• Electric PTO blade-engagement system
• 12V starting battery
• Electric ignition key
• Side-discharge chute
• Foot-operated deck-lift system
• Cutting-height adjustment dial
• High-back operator seat
• Dual LED headlights
• Rear tow hitch
• Cup holder
• Front caster wheels
• Rear drive tires
• Factory-installed safety-interlock system
• Operator documentation

Dealer assembly, fuel level, engine-oil preparation, supplied keys, and documentation may vary according to the retailer and delivery method.

Accessories Sold Separately

• Double bagger for compatible 42-inch decks
• Compatible mulching kit
• Xtreme replacement blade set
• Standard replacement blades
• Hour-meter kit
• Fender kit
• Sun shade
• Mower cover
• Utility cart
• Lawn sweeper
• Tow-behind spreader
• Dethatcher
• Light-duty aerator
• Replacement deck belt
• Replacement drive belt
• Engine oil
• Oil filter
• Air-filter elements
• Spark plugs
• Fuel filter
• Battery charger or maintainer

Accessory compatibility should be confirmed with the complete 17BIEACEA10 model number and serial number before ordering.

Ideal Applications

• Medium and large residential lawns
• Properties with trees and landscape obstacles
• Open grass areas
• Routine weekly lawn mowing
• Side-discharge mowing
• Mulching with an optional kit
• Grass collection with an optional bagger
• Homeowners replacing a traditional lawn tractor
• Users wanting precise zero-turn control
• Properties suitable for a 42-inch deck
• Residential lawns with narrow mowing areas
• Users wanting Kawasaki V-Twin engine power
• Buyers seeking a fabricated cutting deck
• Properties requiring fast 7 MPH travel
• Relatively level or moderately uneven maintained lawns
• Light towing with compatible lawn accessories
• Homeowners able to perform routine gasoline-engine maintenance