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A dual-fuel mowing addition.

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With municipalities pushing clean-air initiatives and the new EPA regulations for spark-ignited engines affecting the majority of the turf market, manufacturers such as Scag Power Equipment will be showcasing alternatively fueled lawn mowers at the GIE-Expo tradeshow in Louisville, Ky.

On display from Scag will be a dual-fuel platform of its Turf Tiger zero-turn mower powered by gasoline and liquid propane. The dual-fuel option allows users to switch from gasoline to LP while mowing for compliance in areas requiring lower exhaust emissions.

Available with a 52, 61 and 72 in. cutting width, the dual-fuel Turf Tiger is powered by a three-cylinder Kubota engine that has been modified with a Kubota factory-installed fuel system to operate off both gasoline and LP. When fueled on gasoline, the engine develops 31 hp. With propane it is rated 29 hp.

Dual LP tanks are mounted on each side of the mower to provide fuel to the engine, while a 10 gal. tank feeds gasoline when needed. Fuel selection is switch operated, making it simple to toggle between the fuel sources. The gasoline/LP system also incorporates a heated regulator and has liquid withdraw.

In its standard platform, the Turf Tiger mower is available with a variety of gasoline and diesel engine options rated 27 to 35 hp. Offered are a 27 hp Kohler Command engine, 31 hp Kohler Aegis EFI engine, 27 or 29 hp DFI liquid-cooled Kawasaki engine, 35 hp Briggs & Stratton Vanguard air-cooled or liquid-cooled V-twin engine, 25 hp Kubota diesel engine or 28 hp Cat diesel engine.

The dual-fuel mower shares the majority of Scag's standard Turf Tiger platform such as the hydrostatic drive, which uses dual Hydro-Gear pumps to power Ross wheel motors. The drive has integrated pressure relief valves to reduce internal pressure spikes. A direct-mounted fan keeps the pumps cool. Dual 24 in. drive wheels are fitted on the mower as well as front 13x6 caster wheels with tapered roller bearings in the caster pivots for greater durability and reduced maintenance. Ground speed on the mower is 10 to 12 mph, depending on the engine.

Scag's shaft-driven Velocity Plus cutting deck is featured on the dual-fuel mower. The deck is adjustable by a foot pedal and engaged by an Ogura PTO clutch with up to 350 lb.ft. of torque. The cutting deck is equipped with heavy-duty drive spindles and Marbain cutting blades, and it is adjustable from 1 to 6 in. in 0.25 in. increments. A custom cut baffle allows customization of the cutting deck to the mowing condition, Scag said.

Like Scag's standard Turf Tiger mower, the dual-fuel configuration is constructed on a double-steel frame and uses split steel drive and load pulleys. The Command-Comfort operator station allows adjustment with QuickFit Control levers with dual dampers for increased responsiveness, torsion spring suspension seat with cushioned arm rests, and three-position deck lift foot pedal. The operator panel includes ammeter, key switch, throttle, manual choke and neutral interlock mower engagement switch.

Accessory options for the mower include a lawn striping kit, spindle-driven grass catchers and halogen light kit.

Scag will begin offering the dual-fuel Turf Tiger mower in 2009 from its Mayville, Wis., headquarters. The company produces a line of zero-turn, walk-behind and front-mount mowers.
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Title Annotation:TECHNOLOGY OF CLEAN AIR
Publication:Diesel Progress North American Edition
Date:Oct 1, 2008
Words:540
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