A stump cutter tooth assembly includes a stump cutter tooth held by a pocket member that includes an arcuate shoulder having one or more tabs. A stump cutter tooth is adapted to be mounted on the pocket member. The stump cutter tooth includes a tooth body having one or more recesses and an arcuate outer surface. The arcuate outer surface of the stump cutter tooth is adapted to abut against the arcuate shoulder of the pocket member to prevent unwanted movement of the stump cutter tooth relative to the pocket member during the cutting operation. The one or more recesses of the stump cutter tooth cooperate with the one or more tabs of the pocket member to provide an anti-rotation and locating feature.

A stump grinder is configured to mount to a portable machine that operably supports the stump grinder during a stump grinding procedure. The stump grinder includes a cutting wheel that is rotatably driven during the stump grinding procedure. The cutting wheel has a cutting surface to grind the stump by moving the rotating cutting wheel across the stump. A wheel stabilizing assembly is disposed between the portable machine and the drive system for supporting the drive system and cutting wheel. The cutting wheel is held in a generally vertical orientation and movement of the cutting wheel is biased relative to the portable machine. Accordingly, forces applied against the cutting surface of the cutting wheel during the grinding procedure are limited by the biased movement.

Vehicles having a control console that may be moved between a plurality of locations relative to the body of the vehicle are disclosed. The control console may include a direction control device for controlling movement of the vehicle that is adaptive such that movement of the vehicle is based on both the direction at which the direction control device is actuated and the sensed position of the control console.

A lifting apparatus is provided. The apparatus includes a primary body that has a support for supporting a person, and a secondary body. A releasable coupling provides selective coupling between the primary and secondary bodies. The lifting apparatus has (a) a first condition in which the primary body is coupled to the secondary body, and (b) a second condition in which the primary body is not coupled to the secondary body, and is configured to be releasably coupled to a vehicle.

A material reduction system and processing tool for a material processing machine. The material reduction system comprises a tool holder fixedly mounted to a rotary drum. A leading member defines a raker surface oriented away from the operating direction at a first predefined angle. A processing tool is removably coupled to the tool holder. A leading face of the processing tool is oriented toward the operating direction at a second predefined angle. The first and second predefined angles are such that material is directed into contact with the reducing member to limit material contact with the tool body and the tool holder. An upper flange of the processing tool directly abuts the tool holder to direct material away from the tool holder. The upper flange and a lower flange define a tool recess configured to receive a projection from the tool holder to prevent rotation of the processing tool.

A horizontal grinding machine includes a frame, a feed hopper that receives material to be processed, and a feed conveyor that moves material to be processed in a processing direction. A grinding cylinder rotates about a generally horizontal grinding axis. A feed roller assembly is mounted on the frame at the rear end of the feed hopper and in front of the grinding cylinder. The feed roller assembly includes a feed roller that rotates about a generally horizontal axis in a first direction that urges the material towards the grinding cylinder and a second direction that urges the material away from the grinding cylinder. A controller is operatively connected to the feed roller and to the feed conveyor and controls the rotational speed of the feed roller and the speed of the feed conveyor to obtain a predetermined ratio of feed roller rotational speed to feed conveyor speed.

A cutter holder has two limbs extending at an angle to each other. A cutter is mounted on one side of the cutter holder. An opposite side of the cutter holder has a prism-shaped cavity defined thereon. The cavity has a V-shape cross-section having a recessed groove at a base of the V-shape. A center line of the recessed groove is laterally offset from a center line of the cutter holder.

A material reduction machine including an engine, a material reduction tool, a drivetrain, and a control system. The drivetrain is between the engine and the material reduction tool, and includes a coupling and a power transfer element, the coupling having an engaged state and a disengaged state. When engaged, the coupling enables power transfer through the power transfer element and when disengaged, the coupling inhibits power transfer through the power transfer element. The control system includes a sensor to detect a speed of the engine or the material reduction tool, a drivetrain protection system to protect the power transfer element by disengaging the coupling, and a controller to enable the drivetrain protection system based on a first signal from the sensor indicating the speed is at or above a first threshold, and to disengage the coupling based on a second signal indicating the speed is below a second threshold.

A cutter wheel for use with a stump cutter having a drive assembly includes a drive plate having first and second sides and a perimeter. A cutter is attached to one of the sides, the cutter having a contact surface configured to engage the side. The cutter has a leading surface and a trailing surface, and a leading mounting hole defining a leading axis and a trailing mounting hole defining a trailing axis. A reference line passes through the leading axis and the trailing axis. A portion of the perimeter of the drive plate is in a zone defined by: a pair of radial lines extending from the leading axis at angles of 20 degrees and 40 degrees radially outward from the reference line, and a pair of arcs 0.25 in. radially outward and inward, respectively, from the leading surface.

A stump grinder has a grinding arm that durably mounts a rotatable grinding wheel by securing the drive shaft of a motor to the grinding wheel such that a pair of bearings within the motor support one side of the grinding wheel and by supporting the other side of the grinding wheel with a stub shaft received within a third bearing. The grinding arm is laterally offset on the frame of the stump grinder to have a swing angle that is not symmetrical relative to the width of the frame, but with the swing angle starting at one side of the frame and then traversing across substantially the entire width of the frame to improve the ability of the operator to see the grinding wheel. A single joystick is movable in orthogonal directions corresponding to desired up and down and side-to-side pivoting motions of the grinding arm. The joystick includes a depressible trigger for starting and stopping the operation of the grinding wheel.