300 Series Liquid-Cooled Diesel
321D Liquid-Cooled Diesel

321D Liquid-Cooled Diesel

Designed for economy and extended service life, efficient Model 321D is built to last and powerful enough to handle any job with the greatest of ease.

KUBOTA DIESEL ENGINE
EPA Tier 4 Final-compliant 44 cu. in. (719 cc), 3-cylinder, liquid-cooled Kubota Clean Diesel engine with horizontal crankshaft and pressure lube for smooth, reliable operation
DESIGN-MATCHED G2 TRANSMISSION
Robust G2 transmission features 7-micron absolute filter and CoolFan™ hydro cooling system HydroGear variable displacement 16 cc piston-pumps and high-torque Parker wheel motors Provides 1,000-hour transmission fluid change interval
HEAVY-DUTY DECK
Extra-deep, 5.5-inch deck is fabricated from heavy-gauge formed steel with a reinforced anvil edge Specially designed cutting chambers enhance airflow for better cut quality Deck easily converts from side discharge to optional Down Discharge™ mulching or PowerVac™ collection Sentry™ spindles with massive, 8-inch flanges anchored in a 6-bolt pattern, spread the force of impact for greater strength Spindle planes are fabricated from double-layered formed steel laminate and combine with the spindles to form a triple-strength deck to keep blades level and deliver a high-quality cut Sentry™ spindle guards shield spindle housing and seal lower bearings from fiber wrap and dirt ingestion
QUIKAJUST® DROP PIN HEIGHT ADJUSTMENT
Raise and lower the deck easily with foot pedal and drop pin for precision cutting heights between 1.0 and 5.0 inches.
WARRANTY
Commercial Use: 3-year unlimited hours; limited warranty covering parts and labor. Residential Use: 4-year or 800-hour (whichever comes first); limited warranty covering parts and labor.
RUGGED CONSTRUCTION
Robotically-welded steel construction for long-lasting durability Centered-bearing design provides greater load-bearing capacity to handle the weight of operator, fuel and high-capacity collector with reserve strength for curb shocks and weight shifts Tough-as-nails powder-coated finish is fusion-bonded for chip and rust resistance
REDUCED MAINTENANCE
Only two Access-Eze™ lubrication points cut maintenance time up to 95% Self-tensioning belts minimize cost and labor on routine maintenance
ULTIMATE OPERATOR STATION®
ComfortZone™ seat eliminates jostles and jolts with coil-spring suspension and a fully padded, high-back seat, padded armrests and variable density foam cushion. Iso-mounting smooths the ride, erases fatigue and keeps the operator comfortably in control at faster mowing speeds
ULTIMATE OPERATOR STATION®
Operational controls including throttle, choke and angled View-Eze™ console and adjustable cup holder are well positioned for visibility and ease of reach
ULTIMATE OPERATOR STATION®
One- or two-handed operation with ComfortReach™ adjustable Hydra-Smooth™ dual levers that automatically return to neutral from either forward or reverse position.
ULTIMATE SUSPENSION RIDE® SEAT
Deep-cushioned, high-back, foam-padded, scuff-resistant Cordura®-covered seat with padded lumbar support and armrests Roomy, iso-mounted, shock-absorbing footrest
VIGILANT OPERATOR PRESENCE SYSTEM™
Standard, low profile Roll-over Protection System (ROPS) structure with an adjustable seatbelt Dampened steering levers that return to neutral from forward and reverse Interlock switches that shut down the engine when the operator leaves the seat while PTO is engaged or levers are in drive position
HIGH TEMPERATURE CLUTCH CUT OUT
Equipped with a High Temperature Clutch Cut-Out that automatically disengages the PTO if engine temperature reaches a certain point to prevent engine damage
4X REAR DISCHARGE DECK
Dedicated 48-inch and larger rear discharge decks throw clippings out back for a smooth cut and no windrowing
WIDE SEAT CONVERSION KIT
Provides additional seating room for larger operators or to accommodate cell phones or pagers. Requires seat belt extension.
PREMIER SUSPENSION SEAT
Optional premier suspension seat provides the ultimate in operator comfort. Low-profile seat slides fore and aft and includes an integrated shock absorber that manually adjusts to operators between 100 – 300 lbs. Other ergonomic features include a backrest that tilts from -5 degrees to +30 degrees, a lumbar support mechanism, adjustable armrests and a retractable seat belt.
EXTENDED STEERING LEVERS
Provides an additional two inches of leg clearance
QUIKAJUST TILT™ LEVERS
Available for all MidMount models, optional QuikAjust Tilt™ steering levers (except 124V-41) with "no tools" adjustment provide a 9-inch range for maximum comfort and fit while maintaining natural arm and wrist positions..
SIDE DISCHARGE CONTROL KIT
Control the discharge of the mower deck to avoid putting clippings in flower beds and on sidewalks
DURAFLEX® SUSPENSION FORKS
Optional DuraFlex™ Suspension Forks absorb the impacts of rough terrain to maintain a level cut, and can be set for use with PowerVac™ collectors.
FOLDABLE ROPS
The Foldable ROPS allows the two-post ROPS to be lowered for mowing under low-hanging trees and other overhead obstacles, or for storing and transporting in enclosed trailers with low door clearance. CAUTION: Avoid drop-offs, embankments and steep slopes. Do not allow ROPS to provide a false pretense of security in hazardous areas and avoid questionable conditions. Always wear seatbelt when Foldable ROPS is in up-right position. When Foldable ROPS is down, DO NOT use seat belt, and drive with extra caution.
SUNSHADE CANOPY VINYL
Lightweight, water repellent, UV-resistant vinyl canopy mounts easily to OPS or ROPS to limit exposure to direct sunlight, reducing eye strain and increasing operator comfort.
DURAGUARD™ REAR BUMPER GUARDS
Optional 2-bar DuraGuard™ Rear Bumper provides additional protection of the rear of the mower while preserving easy access for removal of the rear service shield. Available on the 200, 300 and 400 Series.
FILTER MINDER KIT
The Filter Minder alerts the operator when airflow is restricted in the air canister on dual-element air filters. The Filter Minder is available as an option on all MidMount™ models except V Series, 225, 327 EFI and 321D. (Standard on 400 Series)
RADIATOR CLEANING WAND
A multi-channel sprayer that combs water pressure between radiator fins without damage, dislodging packed-in dust and debris that can become an invisible source of engine overheating. Remove and clean radiator screen regularly. A dirty screen will cause the engine to overheat. For use on liquid-cooled models only.
LED WORK LIGHTS
LED work lights provide improved visibility in low light situations.
YELLOW BEACON LIGHT
Yellow beacon attaches to OPS or ROPS to provide greater visibility in high-traffic areas.
SUNSHADE CANOPY ALUMINUM
Diamond-plated aluminum canopy is highly resistant to abrasions. Easily mounts to ROPS to increase operator comfort by limiting exposure to direct sunlight and reducing eye strain.
DOWN DISCHARGE™ MULCHING PACKAGE
The optional Down Discharge™ mulching package with GrassMax™ medium-lift blades cuts and recuts clippings and directs them deep into the grass bed, enriching turf and producing a beautifully manicured cut.
ELECTRIC HEIGHT ADJUSTMENT
The Electric Height Adjustment kit offers 1- to 5-inch height adjustment control from the operator's seat with the flip of a switch. This dealer-installed option is available for all 200 and 300 Series MidMount™ models.
SPEEDTRIMMING™ ROLLER KIT
The optional SpeedTrimming™ heavy-duty, anti-scalp roller kit for 61-inch and larger DuraMax® decks speeds close trimming near buildings, fences retaining walls and other landscaping features. Kits available for both left and right sides of cutting decks.
TRIMAIDE™ VERTICAL ROLLER KIT
Available for the left-hand corner of 52-inch DuraMax® decks speeds close trimming near buildings, fences retaining walls and other landscaping features.
EDGE-EZE™ EDGER
Creates clean, sharp turf edges along sidewalks, roadways and driveways, eliminating time-consuming secondary trimming and reducing edging time up to 75 percent compared to hand-held string trimmers and walk-behinds.
SHIELDED SPRAYER
Accepts 53-inch, 30-gallon shielded sprayer, which features aerodynamically designed shields and fully shielded curtains to contain chemical spray. Four-nozzle spraying chambers apply small droplets that "stick" to vegetation for more coverage per tank using less chemicals.
POWERVAC® MIDMOUNT COLLECTION SYSTEM
PowerVac™ Collection Systems deliver a clean sweep on every pass. Simply adjust your mowing speed to your conditions. Quik-D-Tatch® Vac drive can be removed in seconds without tools
CUSTOM CORDURA® WEATHER COVER
Weather-resistant, black Cordura fabric cover with embroidered Grasshopper logo keeps seat and engine area protected during storage or between mowings. Slips over ROPS, with Velcro closure to secure the opening.

Engine

48" 321D
Engine TypeKubota, 3-cyl.
Displacement43.9 cu. in. (719 cc)
LubricationPressure Lube/Filter
CrankshaftHorizontal
Engine CoolingLiquid
Fuel TypeDiesel - No. 2
Fuel Capacity12 U.S. Gal. (45.4 l)
Optional Fuel CapacityNA
Air CleanerHeavy-duty, remote mounted, cyclonic, dual element air filtration.
MufflerUltra quiet, single, industrial type.

DuraMax Decks

48" 321D
DuraMax® DeckDuraMax®
Mulch Kit #504551
Deck Size48"
Cutting Height Range1.0 to 5.0 in. (2.5cm to 12.7 cm)
Deck ConstructionDouble-layered 10-gauge plus 7-gauge formed-steel laminated spindle plane 0.313 in (7.95 mm) thick - more than 25% thicker than 0.25 in. (6.35 mm) with 7-gauge skirts for geometric strength. Spindle plane is 0.9 in.(22.86 mm) thick in stress zones. Anvil-edge design with 0.5 in. (12.7 mm) reinforcement on front edge of deck.
Deck Blades(2) 18 in. (45.7 cm) (1) 15 in. (38.1 cm)
Deck SpindlesSentry™ Spindle System, 2.5 cm (approx. 1 in.) O.D. shaft. Double bearings greasable from top of deck. Spindle head designed to eliminate fiber wrap. Spindle cones shield housing and lower bearings from fiber wrap and dirt ingestion.
Spindle Housing8 in. (20.3 cm)-diameter machined aluminum housing with 6-bolt pattern.
Blade DriveBelt drive with single Kevlar V-belt and idler arm tensioning.
Deck TrimabilityNA

Starter & Electrical System

48" 321D
Battery12 Volt
StarterSolenoid shift
IgnitionBreakerless, diesel quick heat glow plug
Interlock SystemPrevents engine start when PTO clutch is engaged or steering levers are in drive position. Allows operator dismount without engine shutdown only when PTO is disengaged and steering levers are locked in neutral.

Ultimate Operator Station

48" 321D
Operator SeatUltimate Suspension Ride (USR) iso-mounted, high-back, deep-cushioned, foam-padded, CoolTemp Cordura-covered, padded arms/backrest with lumbar support and coil-spring suspension. Optional CoolTemp Cordura-covered premier suspension seat.
SuspensionInFrame™ suspension with iso-mounted seat and footrest
Console-mounted InstrumentsLow engine oil pressure, alternator, temperature and parking brake warning lights, engine temperature and volt gauges, combination electronic fuel gauge/hour meter, glow plug, ignition and push/pull PTO switches.
Work LightsOptional - LED
Hour MeterStandard

Transmission & Steering

48" 321D
Transmission TypeDesign-matched G2 hydrostatic system with auxillary cooling fans, HydroGear variable displacement 16 cc piston-type pumps and high-torque Parker wheel motors.
Transmission Filtration7 micron absolute, spin-on / Grasshopper CoolTemp Hydro-Max™ fluid withstands high and low temperature extremes for 1,000-hour change intervals.
Speeds0 - 10.0 mph (0 - 16.1 kph) forward 0 - 6.0 mph (0 - 9.7 kph) reverse
Turning RadiusTrue zero degree, turns within own length with counter-rotating, independently powered drive wheels.
SteeringOne- or two-hand operation with adjustable HydraSmooth™ dual levers that automatically return to neutral from either forward or reverse position.
BrakesDynamic braking through hydrostatic transmission.
Parking BrakeDisc parking brakes, one for each drive wheel.
Attachment DriveNA

Tire Sizes

48" 321D
Standard Midmount Drivetire23x10.50x12 turf, 4-ply rated
Optional MidMount™Drive TiresNA
MidMount™ Front Caster Wheels13x6.50x6; rib tread, pneumatic with greasable, double-sealed bearings to protect from grass wrap.
Standard FrontMount™ Drive TireNA
Optional FrontMount™ Drive TireNA
FrontMount™ Single Frok Tail Wheel SizeNA
FrontMount™ Wide Stance Single Fork Tail Wheel SizeNA
FrontMount Deck Tire

Dimensions

48" 321D
Height, Seatback46.5 in. (118.1 cm)
Height Seat Cushion31.0 in. (78.7 cm)
Height ROPS69.0 in. (175.3 cm)
Mower+Deck Length81.5 in. (207.0cm)
Mower+Deck - Deck Folded
Deck Width - Side Discharge61.5 in. (156.2 cm)
Deck Width - Side Discharge 41"NA
Deck Width - Side Discharge 42"NA
Deck Width - Side Discharge 48"61.5 in. (156.2 cm)
Deck Width - Side Discharge 52"NA
Deck Width - Side Discharge 61"NA
Deck Width - Side Discharge 72"NA
Deck Width - Mulching49.5 in.* (125.7 cm)
FrontMount™ WidthNA
FrontMount™ WheelbaseNA

Weight

48" 321D
Weight Power Unit+Deck (uncrated)1210 lbs. (548.8 kg)
Weight FrontMount™ Power Unit onlyNA
Weight Mower Deck
Weight Mulch Kit25 lbs. (11.3 kg)
REQUEST A QUOTEREQUEST A DEMO
Email
First Name
Last Name
Phone
Postal Code
Best time to contact
Comments
Select a variant
Email
First Name
Last Name
Phone
Postal Code
Best time to contact
Comments
Select a variant