| 摘要 |
A tractor comprising a pair of power transmitting means which connect engine output to left and right final drive means individually, each of said power transmitting means including a first fluid actuated clutch means for connecting said final drive means associated with said each of the power transmitting means to the engine output so as to drive the final drive means in forward direction and a second fluid actuated clutch means for connecting said final drive means associated with said each of the power transmitting means to the engine output so as to drive the final drive means in backward direction, a pair of control valve means having spools for controlling supply of pressure fluid to said clutch means, a single maneuvering lever, and connecting means connecting said lever and said spools and having a first connecting member for displacing both of said spools in a same direction and a second connecting member for displacing the spools in opposite directions. By manually operating said single maneuvering lever the left and right final drive means can be driven to rotate so as not only to stop, advance and retreat the tractor but to spin-turn the tractor to the left and right and further to turn the tractor to the left and right with an optional radius of turn by combining the operation of said maneuvering lever with manual operation of brakes for the final drive means. |
