Hydraulic propulsion system

Claim 1

A HYDRAULIC DRIVE TRANSMISSION SYSTEM COMPRISING IN COMBINATION WITH AN ENGINE HAVING A THROTTLE MEANS, MANUALLY OPERABLE MEANS INCLUDING ADJUSTABLE PRESSURE FLUID CONTROL VALVE MEANS, SAID MANUALLY OPERABLE MEANS BEING OPERABLY CONNECTED TO AND CONTROLLING SAID ENGINE THROTTLE MEANS, HYDRAULIC PUMP MEANS DIRECTLY DRIVEN BY SAID ENGINE AND OPERABLE TO PLACE HYDRAULIC FLUID UNDER PRESSURE, HYDRAULIC PUMP AND MOTOR MEANS, AT LEAST ONE OF SAID HYDRAULIC PUMP AND MOTOR MEANS BEING OF THE NORMAL MINIMUM FLOW VARIABLE DISPLACEMENT TYPE HAVING DISPLACEMENT CONTROL MEANS, CONDUIT MEANS HYDRAULICALLY CONNECTING SAID MOTOR MEANS WITH SAID HYDRAULIC PUMP MEANS FOR ACTUATION THEREBY, THE FLOW OF PRESSURE FLUID IN SAID CONDUIT MEANS BEING RESPONSIVE TO SAID MANUALLY OPERABLE PRESSURE FLUID CONTROL VALVE MEANS, SELECTIVE DIRECTIONAL FLOW VALVE MEANS FOR CONTROLLING FLOW AND THE DIRECTION OF FLOW TO FLUID TO SAID HYDRAULIC MOTOR MEANS, A NORMALLY OPEN BYPASS VALVE MEANS IN HYDRAULIC COMMUNICATION WITH SAID CONDUIT MEANS SELECTIVELY PERMITTING AND PREVENTING THE FLOW OF FLUID FROM SAID PUMP MEANS TO SAID HYDRAULIC MOTOR MEANS, SEPARATE CONTROL CIRCUIT MEANS INCLUDING MEANS OPERABLE FOR CONTROLLING SAID DIRECTIONAL FLUID FLOW CONTROL VALVE MEANS, SAID BYPASS VALVE MEANS BEING ACTUATED TO CLOSED POSITION BY SAID MANUALLY OPERABLE MEANS DURING INITIAL ACTUATION THEREOF OF DIRECT FLUID FROM SAID PUMP MEANS TO SAID MOTOR MEANS.