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With a compelling blend of speed, power, cut quality and value, the new Radius S-Series is the ideal zero-turn mower for home and acreage owners that demand advanced performance. Choose from 48-, 52- or 60-inch UltraCut Series 3 side-discharge cutting decks equipped with Exmark’s exclusive flow-control baffles for superior cut quality. The deluxe high-back seat features adjustable spring suspension, with molded flip-up armrests to deliver superior all-day comfort for operators of virtually any stature.Radius S-Series models are designed for maximum durability with reduced maintenance needs. With just two annual grease points, low-maintenance HydroGear transmissions, reliable Kawasaki engines, and long-lasting components, the Radius S-Series is designed to run stronger and longer with less maintenance.Looking for even more power, productivity and durability? Check out the new Radius X-Series zero-turn mower. (RD models coming in 2026.)
UPC
193308242460
Width / Cutting Deck
52″
Drive
Hydro-Drive
Starter
Electric
Steering Control
Hydraulically dampened twin levers adjustable both fore and aft. Also has 2-position height adjustment.
Caster Forks
.375″ thick caster yoke arms.
Front Caster Tires
13 x 6.5-5 smooth-tread, pneumatic.
Drive Tires
23 x 9.5-12 K3012
Safety Package
Operator Presence Controls (OPC) and drive system interlock.
Parking Brake
Automatic-actuated pawl brake.
Tractor Frame
Unibody, welded, heavy-duty 1.5″ x 3″ tubular steel.
Blade Spindles
No maintenance, sealed and non-greasable spindles; 7.75″-diameter cutter housing with 25mm (.98″) diameter spindle shaft.
Cup Holder
Yes
Electrical
12 volt battery with 15-amp alternator
Standard Features
Hour meter, cup holder, hitch, suspension seat
Seat
Deluxe, two-tone, bolstered suspension seat with flip up armrests and 3″ travel
Optional Features
Hour meter, suspension seat and armrests
Transmission Brand
Hydro-Gear
Transmission Speeds
Infinitely Variable
Engine Brand
Kawasaki
Engine Model
FR691
Engine Displacement
691
Fuel System
Carbureted
Speed
Infinitely variable speed selection from 0–9.0 mph forward, 0–4.5 mph reverse
Transmission
Hydrostatic
Engine Series
V-Twin
Engine Speed
3,600 rpm
Engine Spec
AS43-R
Fuel Capacity
7-gallon single fuel tank with single fill location
Air Filter
Standard Engine Manufacturer’s air filter
Drive Description
Two Hydro-Gear ZT-3100 hydro static transmissions with no hoses and integrated cooling fans and integrated reservoir
Fuel Type
Gas Carbureted
PTO Engagement
Electromagnetic 105-ft-lb clutch
Fuel Indicator
Float gauge
Drive Wheel Release
Allows unit movement without engine running.
Deck Lift
Foot pedal, single point drop pin HOC lift assist springs
Carb Compliant
No
ROPS
2-post foldable ROPS standard with seat belt.
Deck Style
Floating Deck
Deck Style Description
Full-floating UltraCut Series 3, side discharge standard, with molded discharge chute and option to bag or mulch.
Deck Construction
10-gauge top that is formed and welded, 7-gauge side skirt and .375″ welded bumper. 4 point suspension.
Cutting Heights
1.5″ to 5.0″ in 0.25 increments
Blade Tip Speed
Approximately 18,500 fpm
Blades
3 Blades at 18.0″ Length
Width
64.3″
Height
73.7″
Curb Weight
881
Length
83.9″
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