Patent ID: 7237629

Claim:
A zero-turn radius vehicle comprising: a frame; an engine operatively connected to said frame; first and second steerable front wheels rotatably mounted to said frame; first and second drive wheels rotatably mounted to said frame; a front wheel steering system further comprising a steering cam shaft having a first steering cam and a second steering cam rotatably mounted to said steering shaft at a first axis of rotation, and at least one steering sprocket rotatably mounted to said steering cam shaft at said first axis of rotation for meshingly engaging a first wheel sprocket associated with said first steerable front wheel and a second wheel sprocket associated with said second steerable front wheel; a first pump having a pump shaft operatively connected to said first drive wheel and having a pump arm operatively connected to a swash plate rotatable in a forward direction and a reverse direction for controlling an amount and a direction of power output from said first pump to said first drive wheel; a second pump having a pump shaft operatively connected to said second drive wheel and having a pump arm operatively connected to a swash plate rotatable in a forward direction and a reverse direction for controlling an amount and a direction of power output from said second pump to said second drive wheel; a forward control assembly having a forward control shaft rotatably connected to said frame and receiving an input from a forward input device, said forward control assembly being operatively connected to said pump arms of said first and second pumps via a pump forward control assembly and providing an equal forward rotation of said pump arms; an engagement cam system having an engagement cam shaft rotatably mounted to said frame and an engagement cam disposed on said engagement cam shaft, wherein said engagement cam shaft is operatively connected to a first and second cam follower, each of which further comprises first and second bearings, respectively; a first push cable having a first end and a second end connected at its first end to said first cam follower and connected at its second end to said pump arm of said first pump; and a second push cable having a first end and a second end connected at its first end to said second cam follower and connected at its second end to said pump arm of said second pump.