Abstract: A lawnmower includes a frame, a pair of drive wheels, a front axle assembly, a first caster wheel, a second caster wheel, a first rod, a second rod, and a mower deck. The pair of drive wheels are coupled to a second end portion of the frame. The front axle assembly includes a bar pivotally coupled to a first end portion of the frame about a pivot axis. The first caster wheel is coupled to a first lateral end of the bar. The second caster wheel is coupled to a second lateral end of the bar. The first rod is coupled between the frame and the first lateral end of the bar. The second rod is coupled between the frame and the second lateral end of the bar. When the bar pivots about the pivot axis, the first caster wheel and the second caster wheel move relative to the frame.

Abstract: A zero turn radius lawnmower, such as a stand-on lawnmower, including a main frame having a first end portion and a second end portion, a pair of drive wheels operably coupled to the second end portion of the main frame and configured to be driven independently in both forward and reverse directions, and a front axle assembly pivotally coupled to the first end portion of the main frame about a single axis. The zero turn radius lawnmower also includes a pair of caster wheels coupled to respective ends of the front axle assembly such that the pair of caster wheels are able to move relative to the main frame, as well as a mower deck coupled to the main frame by at least one first linkage and coupled to the front axle assembly by at least one second linkage.

Abstract: A zero turn radius lawnmower, such as a stand-on lawnmower, including a main frame having a first end portion and a second end portion, a pair of drive wheels operably coupled to the second end portion of the main frame and configured to be driven independently in both forward and reverse directions, and a front axle assembly pivotally coupled to the first end portion of the main frame about a single axis. The zero turn radius lawnmower also includes a pair of caster wheels coupled to respective ends of the front axle assembly such that the pair of caster wheels are able to move relative to the main frame, as well as a mower deck coupled to the main frame by at least one first linkage and coupled to the front axle assembly by at least one second linkage.

Abstract: An extra-wide self-propelled lawn mower employs twin hydrostatic transmissions to power the left and right rear drive wheels that are situated behind a forward moving deck. Hydrostatic drives have infinitely variable adjustment speed from reverse through neutral, to a maximum forward speed. There are also independent left and right control levers mounted adjacent the hand grips that are coupled through linkages to control levers for the respective hydrostatic transmissions. An engine has its center of gravity situated behind the drive wheel axles to balance the weight of the moving deck. Spring returns associated respectively with the two hydrostatic transmissions return the same to the neutral position when an operator releases the respective control levers.

Abstract: An extra-wide self-propelled lawn mower employs twin hydrostatic transmissions to power left and right drive wheels situated behind a forward mowing deck. There are left and right primary speed control levers adjacent hand grips on the mower hand assembly. These have linkages that include a common pivot shaft and respective spring couplings to control the actuator arms of the hydrostatic transmissions. Secondary speed control levers, in the form of brake levers, are mounted adjacent the right and left hand grips and are non-resiliently coupled to the hydrostatic transmission actuators arms. The secondary levers are squeezed to override the primary speed control and slow the respective transmission for braking or to effect a turn, pivoting about the inside wheel. Squeezing the secondary control lever completely will cause the wheel on that side to reverse, effecting a pivoting at the center of the mower.

Abstract: A self-propelled lawn mower employs a hydrostatic transmission and differential to power rear drive wheels which are situated behind a forward mowing deck. The hydrostatic drive has infinitely variable adjustment of speed from reverse, through neutral, to a maximum forward speed. There are independent disc brakes for the drive wheels, with right and left brake levers situated adjacent the operator hand grips. An engine has its center of gravity behind the drive wheel shaft to balance the weight of the mowing deck. Left and right thumb-operated control levers are rockably mounted on the handle bar assembly, adjacent the inboard side of the right and left hand grips. This arrangement permits one-hand control of the transmission speed with either hand, while actuating the respective brake lever with the same hand, making one-hand brake-turning of the mower possible. The engine output shaft has a pulley connected by belt drives to the blades and to the hydrostatic drive.

Abstract: A self-propelled lawnmower employs a hydrostatic transmission and differential to power rear drive wheels which are situated behind a forward mowing deck. The hydrostatic drive has infinitely variable adjustment of speed from reverse, through neutral, to a maximum forward speed. There are independently actuated disc brakes for the drive wheels, with right and left brake levers situated adjacent the operator hand grips. A vertical shaft engine is situated with its center of gravity behind the drive wheel shaft to balance the weight of the mowing deck. The operator can control the speed and direction of the mower without removing his hands from the hand grips. By selecting actuation of the disc brakes, the machine can be effortlessly turned without a reduction in speed. The engine output shaft has pulleys connected by drive belts to the blades and to the hydrostatic drive.

Abstract: A self-propelled lawnmower having a hydrostatic transmission and a differential mechanism to power the rear drive wheels which are situated behind a forward mowing deck. The hydrostatic drive has infinitely variable adjustment of speed from reverse, through neutral, to a maximum forward speed. There are independently actuated disc brakes for the rear drive wheels, with right and left brake levers situated adjacent the operator hand grips. The engine is situated with its center of gravity behind the drive wheel shaft to balance the weight of the mowing deck. The operator can control the speed and direction of the mower without removing his hands from the hand grips. By selecting actuation of the disc brakes, the machine can be effortlessly turned without a reduction in speed.