A mower folding-type chassis, comprising a fixing disc and at least one rotating disc rotationally connected with the fixing disc; the fixing disc is fixedly arranged at the bottom of the mower; mowing blades are respectively arranged within the shells of the fixing disc and the rotating disc; a driving device used for driving the mowing blades to rotate is arranged in the mower; when mowing a lawn, the rotating discs can be rotated and unfolded relative to the fixing disc, thereby improving the mowing efficiency, and when the mower needs to be stored or transported, the rotating discs can be rotated and folded relative to the fixing disc, thus reducing the space occupation of the mower.

A mower folding-type chassis, comprising a fixing disc and at least one rotating disc rotationally connected with the fixing disc; the fixing disc is fixedly arranged at the bottom of the mower; mowing blades are respectively arranged within the shells of the fixing disc and the rotating disc; a driving device used for driving the mowing blades to rotate is arranged in the mower; when mowing a lawn, the rotating discs can be rotated and unfolded relative to the fixing disc, thereby improving the mowing efficiency, and when the mower needs to be stored or transported, the rotating discs can be rotated and folded relative to the fixing disc, thus reducing the space occupation of the mower.

A rope reel includes first circumferential wall portion that is erectly provided so as to surround outer circumference of recoil spring. A starter case includes second circumferential wall portion that is erectly provided so as to adjoin inner circumferential face or outer circumferential face of first circumferential wall portion. The first circumferential wall portion and the second circumferential wall portion are disposed so that end edges of the first circumferential wall portion and the second circumferential wall portion overlap each other when viewed in radial direction. A plate is disposed between starter case and recoil spring inside first circumferential wall portion. Thus, it is possible to provide structure which is realized in space-saving manner to make foreign substances difficult to intrude into starting device in order to prevent deformation or damage of recoil spring, and from which the foreign substances are easily discharged even if foreign substances have intruded.

A work machine determines, when a request to restart an engine is made, whether or not a reason indicated by stop information stored in a memory is a reason related to locking of the work portion. The machine sets an operation mode of the engine and a work portion to a safe mode if it determines that the reason indicated by the stop information is a reason related to locking of the work portion. The safe mode is an operation mode for lessening damage resulting from causing the engine and the work portion to work during the work portion locked or damage resulting from an object coming into contact with the work portion during the engine and the work portion working.

A work machine determines, when a request to restart an engine is made, whether or not a reason indicated by stop information stored in a memory is a reason related to locking of the work portion. The machine sets an operation mode of the engine and a work portion to a safe mode if it determines that the reason indicated by the stop information is a reason related to locking of the work portion. The safe mode is an operation mode for lessening damage resulting from causing the engine and the work portion to work during the work portion locked or damage resulting from an object coming into contact with the work portion during the engine and the work portion working.

A mower drive belt tensioner arm includes an elongate body having a tension pulley to provide tension to a mower drive belt. One of a pair of rear draft towers on the mower deck supports the elongate body above the surface of the mower deck. A coil spring urges an end of the elongate body in a direction between the pair of draft towers. A pivotable belt keeper may be mounted to the tensioner arm without tools, and extends over the perimeter of the tension pulley.

A mower drive belt tensioner arm includes an elongate body having a tension pulley to provide tension to a mower drive belt. One of a pair of rear draft towers on the mower deck supports the elongate body above the surface of the mower deck. A coil spring urges an end of the elongate body in a direction between the pair of draft towers. A pivotable belt keeper may be mounted to the tensioner arm without tools, and extends over the perimeter of the tension pulley.

A mower can be adaptively controlled to optimize efficiency based on loads experienced by motors that drive the cutting blades and/or based on vertical movement that a mower deck is experiencing. If the load is below a threshold, the ground speed of the mower can be increased. If the vertical movement or load exceeds a threshold, the ground speed can be reduced. The mower's performance can also be monitored to identify characteristics of an area being cut and then such characteristics can be used to further enhance the efficiency of the mower. A density map can be created based on monitored load, vertical movement and possibly other characteristics as a mower is cutting a particular area. The density map can be employed by any mower that is subsequently used to cut the same area.

A mower can be adaptively controlled to optimize efficiency based on loads experienced by motors that drive the cutting blades and/or based on vertical movement that a mower deck is experiencing. If the load is below a threshold, the ground speed of the mower can be increased. If the vertical movement or load exceeds a threshold, the ground speed can be reduced. The mower's performance can also be monitored to identify characteristics of an area being cut and then such characteristics can be used to further enhance the efficiency of the mower. A density map can be created based on monitored load, vertical movement and possibly other characteristics as a mower is cutting a particular area. The density map can be employed by any mower that is subsequently used to cut the same area.

A motorized turf trimming system and method with integrated control for a carrier vehicle and rotary trimming attachments is disclosed. The system can be configured for automatically trimming around stationary objects such as trees, signposts, guard rail posts, barrier posts, light bases, etc.