Patent ID: 6536845
Filing Date: 2003-03-25
Classification: B60P

Abstract:
In a vehicle comprising a frame, said frame defining a front end and a rear end of said vehicle, an engine mounted on said frame, a left wheel means driven by a first hydraulic motor, a right wheel means driven by a second hydraulic motor, and a rear wheel means driven by a third hydraulic motor, wherein said vehicle further comprises a hydraulic system for powering said hydraulic motors, said hydraulic system comprising:a hydraulic fluid tank secured to said frame, said tank having an input connection for receiving and storing hydraulic fluid and an output connection for withdrawing fluid to be pumped; an adjustable dump hydraulic pump mounted on said vehicle and drivingly connected to said engine, said pump having a pump input connection connected to said output connection of said tank and a pump output connection; and a hydraulic valve and conduit system connected between said pump output connection and said tank input connection including a first control valve connected by conduit to said first and second hydraulic motors for forward and reverse driving of said left and right wheel means, and a second control valve connected by conduit to said third hydraulic motor for engaging or disengaging said rear wheel means, wherein said hydraulic valve and conduit system further comprising selective conduit restriction means connected inline in said conduit connecting said first control valve to said first and second hydraulic motors, wherein said selective conduit restriction means is able to be selectively used by a user to decrease the flow of hydraulic fluid to said first and second hydraulic motors, thereby increasing the flow of hydraulic fluid to said third hydraulic motor.