Maximum Power for Tough Jobs

Especially in mowing conditions that require plenty of horsepower, MaxTorque™ diesel models can complete the job up to 50 percent faster than like-powered LP models.

Which of these mowing conditions do you sometimes face? Wet grass, tall grass and Bahia grass; vacuum collection; mulching; typical roadside and median mowing; industrial park mowing – each of these conditions is better handled with the high-torque power delivered by MaxTorque™ diesel engines, as is the operation of implements such as snowthrowers and aerators.

Torque is the power created by the rotating force of the engine. Diesel engines in Grasshopper mowing equipment have earned their reputation as hard workers due to their ability to maintain the mower's blade tip speed, even under demanding conditions.

Unlike CNG or LP, diesel fuel combusts not from a spark but from high air temperatures created by very high pressure in the engine cylinders. The compression in a Grasshopper MaxTorque™ diesel engine can be up to three times higher than that of a spark ignition engine.

The extra-high-pressure stroke of the piston and resulting combustion generates much greater torque power for the diesel engine versus spark ignition engines. This results in faster mowing speeds that get the mowing done faster. The faster the job is completed, the less fuel is used.

Model Engine Type/ Horsepower Engine Size (Displacement) Speed Cutting Width(s)


321D Kubota/21hp 43.9 cu. in. (719cc) 9.5 mph
(15.3 kph)
325D Kubota MaxTorque™ /25hp 54.8 cu. in. (898 cc) 10 mph
(16.1 kph)
52", 61", 72"


721DT Kubota/20hp 43.9 cu. in. (719 cc) 9 mph
(14.5 kph)
725DT Kubota MaxTorque™ /25hp 54.8 cu. in. (898 cc) 10 mph
(16.1 kph)
52", 61", 72"

With more than 25 years of experience harnessing diesel power in true zero-turn equipment, "diesel done right" with Grasshopper provides exceptional advantages in fuel economy, performance and long service life.

Grasshopper incorporates only heavy-duty, compact and emission-compliant diesel engines into the design of its MaxTorque™ diesel mowers. The result is a smooth, quiet-running, nimble workhorse that is light on turf and heavy on torque.

Three cylinders in concert deliver smooth power at lower revolutions-per-minute (rpm) while Grasshopper's SmartFrame™ and AntiVibe Power Platform® designs isolate the engine and drive train from the operator platform and chassis to create a harmonically balanced, ergonomic power unit that's agile and light on the lawn.

In contrast, not all diesel designs are equal.

Unlike Grasshopper MaxTorque™ diesel's cast iron block design, some manufacturers have tried to incorporate aluminum block diesel designs into mowing products, which don't hold up as well to the engine's internal pressure and force. Others have tried to pack too much weight and bulk into the engine cavity, which reduces fuel economy, maneuverability and performance.

Because combustion in a diesel engine is created with ultra-high air pressure in the cylinders, diesel engines must be extra durable and mounted in such a way that their power is harnessed and focused toward the implement drive and not the frame or chassis.

Because zero-turn radius mowers need to be agile and relatively light on the lawn, their engines must be compact. Grasshopper has found the perfect solution with the utilization of EPA Tier 4 Final-compliant MaxTorque™ diesel engines.