300 Series Air-Cooled Gas
328G4 EFI Air-Cooled Gasoline

328G4 EFI Air-Cooled Gasoline

Offering unparalleled performance and fuel economy, the Model 328G4 EFI features a closed-loop Electronic Fuel Injection (EFI) engine that continually adjusts the fuel ratio to use less fuel, provide reliable hot and cold starts, reduce emissions and minimize fuel-induced service issues.

B&S VANGUARD ELECTRONIC FUEL INJECTION (EFI) ENGINE
810 cc V-Twin B&S Vanguard Delphi® based Electronic Fuel Injection (EFI) OHV gasoline engine with vertical crankshaft and pressure lube run cooler and provide longer service life Closed-loop EFI engine continually adjusts fuel ratio to use less fuel and provide reliable hot and cold starts, reduced exhaust emissions and fewer fuel-related service issues Automotive-style plug-in diagnostics Facilitates faster and more precise service
HYDRO-GEAR TRANSMISSION
The G4 Hydro-Gear ZT-4400 transmissions are designed to provide powerful, smooth response The heavy-duty, self-contained commercial transaxles are integrated with a cooling fan and feature 13/8-inch axles for longer service life. You’ll also enjoy best-in-class transmission fluid change intervals after a 100-hour break-in period, reducing costs and maintenance time.
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 or 1,000-hour (whichever comes first); limited warranty: First two years covering parts and labor, last year covering parts only. • Residential Use: 4-year or 800-hour (whichever comes first); limited warranty: First two years covering parts and labor, last two years covering parts only.
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®
The deep-cushioned, deluxe Ultimate Suspension Ride™ (USR™) seat features a coil-spring suspension and padded lumbar support with sliding 2-inch fore and aft adjustment for all-day comfort. Iso-mounting eliminates vibration before it reaches the seat, and both padded seat and foldable armrests are covered in scuff-resistant, breathable CoolTemp Cordura® fabric, which dissipates heat and won’t tear or crack with extended use. QuikAjust Tilt™ dual levers with 9-inch adjustment and the adjustable seat work together to provide a custom fit for operators of all sizes.
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 QuikAjust Tilt™ dual levers with 9-inch comfort range to custom fit operator's reach. Levers automatically return to neutral from either forward or reverse position and are less strenuous than riding mowers with steering wheels.
ULTIMATE SUSPENSION RIDE® SEAT
Deep-cushioned, deluxe Ultimate Suspension Ride™ (USR™) seat features a coil-spring suspension and padded lumbar support with sliding 2-inch fore and aft adjustment for all-day comfort. Seat and padded, foldable armrests are covered in scuff- and tear-resistant Cooltemp Cordura®. 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
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
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.
BAR-TREAD LOW-PRESSURE TIRES
Optional low-pressure, high-flotation bar-tread tires are available for 61-inch and larger models that flex with the terrain for maximum traction and minimize scuffing caused by wheel spin-out.
Michelin® X® Tweel® Airless Turf Tire
Optional 24x12.00x12 turf-tread drive tire for MidMount™ models equipped with 61- or 72-inch decks, performs like a pneumatic tire but without the inconvenience and downtime associated with flat tires. Provides consistent hub height to ensure the mower deck produces an even cut and excellent lateral stability and outstanding operator comfort.
Michelin® X® Tweel® Airless Front Caster Tire
Smooth tread, 13x6.50x6 caster wheel. Performs like a pneumatic tire, but without the inconvenience and downtime associated with flats.
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.
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.
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

52" 328G461" 328G4
Engine TypeB&S Vanguard, Delphi®-based closed-loop Electronic Fuel Injection(EFI)/V-TwinB&S Vanguard, Delphi®-based closed-loop Electronic Fuel Injection(EFI)/V-Twin
Displacement49.4 cu. in. (810 cc)49.4 cu. in. (810 cc)
LubricationPressure Lube/FilterPressure Lube/Filter
CrankshaftVerticalVertical
Engine CoolingAirAir
Fuel TypeGasoline - unleadedGasoline - unleaded
Fuel Capacity13 U.S. Gal. (49.2 l)49.4 cu. in. (810 cc)
Optional Fuel CapacityNANA
Air CleanerHeavy-duty, cyclonic, remote mounted engine dual cleaner with replaceable elementHeavy-duty, cyclonic, remote mounted engine dual cleaner with replaceable element
MufflerUltra quiet, single, industrial type.Ultra quiet, single, industrial type.

DuraMax Decks

52" 328G461" 328G4
DuraMax® DeckDuraMax®DuraMax®
Mulch Kit #504567504569
Deck Size52"61"
Cutting Height Range1.0 to 5.0 in. (2.5cm to 12.7 cm)1.0 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.Double-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(3) 18 in. (45.7 cm)(3) 21 in. (53.3 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.Sentry™ 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 housing. Machined aluminum housing on 52- and 61-inch deck. Cast iron on 72-inch deck.8 in. (20.3 cm)-diameter housing. Machined aluminum housing on 52- and 61-inch deck. Cast iron on 72-inch deck.
Blade DriveBelt drive with single Kevlar V-belt and idler arm tensioning.Belt drive with single Kevlar V-belt and idler arm tensioning.
Deck TrimabilityNANA

Starter & Electrical System

52" 328G461" 328G4
Battery12 Volt12 Volt
StarterSolenoid shiftSolenoid shift
IgnitionBreakerlessBreakerless
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.Prevents 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

52" 328G461" 328G4
Operator SeatDeep-cushioned, deluxe Ultimate Suspension Ride™ (USR™) seat features a coil-spring suspension and padded lumbar support with sliding 2-inch fore and aft adjustment for all-day comfort. Seat and padded, foldable armrests are covered in scuff- and tear-resistant Cooltemp Cordura®.Deep-cushioned, deluxe Ultimate Suspension Ride™ (USR™) seat features a coil-spring suspension and padded lumbar support with sliding 2-inch fore and aft adjustment for all-day comfort. Seat and padded, foldable armrests are covered in scuff- and tear-resistant Cooltemp Cordura®.
SuspensionInFrame™ suspension with iso-mounted seat and footrestInFrame™ suspension with iso-mounted seat and footrest
Console-mounted InstrumentsLow engine oil pressure, engine code light and parking brake warning light, combination electronic fuel gauge/hour meter, ignition and push/pull PTO switches.Low engine oil pressure, engine code light and parking brake warning light, combination electronic fuel gauge/hour meter, ignition and push/pull PTO switches.
Work LightsOptional - LEDOptional - LED
Hour MeterStandardStandard

Transmission & Steering

52" 328G461" 328G4
Transmission TypeHeavy-duty Hydro-Gear ZT-4400 hydrostatic transmissions with cooling fans. Integrated transaxles with 12cc piston pumps and 16cc piston motors, gear reduction, internal disc brakes and 1-3/8 inch axles.Heavy-duty Hydro-Gear ZT-4400 hydrostatic transmissions with cooling fans. Integrated transaxles with 12cc piston pumps and 16cc piston motors, gear reduction, internal disc brakes and 1-3/8 inch axles.
Transmission FiltrationSelf-contained fluid and internal filtration / Grasshopper CoolTemp Hydro-Max™ fluid withstands high and low temperature extremes for 500-hour change intervals.Self-contained fluid and internal filtration / Grasshopper CoolTemp Hydro-Max™ fluid withstands high and low temperature extremes for 500-hour change intervals.
Speeds0 - 10.5 mph (0 - 16.9 kph) forward 0 - 6.0 mph (0 - 9.7 kph) reverse0 - 10.5 mph (0 - 16.9 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.True 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.One- 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.Dynamic braking through hydrostatic transmission.
Parking BrakeInternal disc brake in transmissionInternal disc brake in transmission
Attachment DriveNANA

Tire Sizes

52" 328G461" 328G4
Standard Midmount Drivetire24x12x12 turf, 4-ply rated24x12.00x12 turf, 4-ply rated
Optional MidMount™Drive Tires24x12.00x12 bar tread, 4-ply rated24x12.00x12 bar tread, 4-ply rated
MidMount™ Front Caster Wheels13x6.50x6; rib tread, pneumatic with greasable, double-sealed bearings to protect from grass wrap.13x6.50x6; rib tread, pneumatic with greasable, double-sealed bearings to protect from grass wrap.
Standard FrontMount™ Drive TireNANA
Optional FrontMount™ Drive TireNANA
FrontMount™ Single Frok Tail Wheel SizeNANA
FrontMount™ Wide Stance Single Fork Tail Wheel SizeNANA
FrontMount Deck Tire

Dimensions

52" 328G461" 328G4
Height, Seatback49.5 in. (125.7 cm)49.5 in. (125.7 cm)
Height Seat Cushion33.0 in. (83.8 cm)33.0 in. (83.8 cm)
Height ROPS70.0 in. (177.8 cm)70.0 in. (177.8 cm)
Mower+Deck Length84.0 in. (213.4 cm)85.0 in. (215.9 cm)
Mower+Deck - Deck Folded
Deck Width - Side Discharge65.5 in. (166.5 cm)74.5 in. (189.2 cm)
Deck Width - Side Discharge 41"NANA
Deck Width - Side Discharge 42"NANA
Deck Width - Side Discharge 48"NANA
Deck Width - Side Discharge 52"65.5 in. (166.5 cm)65.5 in. (166.5 cm)
Deck Width - Side Discharge 61"74.5 in. (189.2 cm)74.5 in. (189.2 cm)
Deck Width - Side Discharge 72"NANA
Deck Width - Mulching53.5 in.* (135.9 cm)62.5 in.* (158.8 cm)
FrontMount™ WidthNANA
FrontMount™ WheelbaseNANA

Weight

52" 328G461" 328G4
Weight Power Unit+Deck (uncrated)1140 lbs. (517.1 kg)1190 lbs. (539.8 kg)
Weight FrontMount™ Power Unit onlyNANA
Weight Mower Deck
Weight Mulch Kit29 lbs. (13.2 kg)36 lbs. (16.3 kg)
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