Hydraulic system

Claim 1

IN A HYDRAULIC SYSTEM: MEANS PROVIDING A SOURCE OF FLUID UNDER PRESSURE AND INCLUDING AT LEAST ONE FIXED VOLUME OUTLET AND A PLURALITY OF VARIABLE VOLUME OUTLETS THROUGH WHICH FIXED AND VARIABLE OUTPUTS RESPECTIVELY OF OPERATING FLUID PRESSURES ARE DISCHARGED; A HYDRAULIC MOTOR ADAPTED FOR CONNECTION WITH AUXILIARY EQUIPMENT OF A VEHICLE; CONDUIT MEANS COMMUNICATIVELY CONNECTING SAID HYDRAULIC MOTOR WITH A FIXED VOLUME OUTLET OF SAID SOURCE OF FLUID PRESSURE; A PAIR OF HYDRAULIC MOTORS ADAPTED FOR CONNECTION RESPECTIVELY WITH A PAIR OF PROPELLING WHEELS OF A VEHICLE; AND CIRCUIT CONDUIT MEANS COMMUNICATIVELY CONNECTING SAID PROPELLING MOTORS WITH THE VARIABLE VOLUME OUTLETS OF SAID SOURCE AND INCLUDING, INTERPOSED IN THE CIRCUIT IN A FLUID FLOW AND SERIES-CONNECTED RELATIONSHIP, A RANGE SELECTOR HAVING FLOW DIRECTING MEANS PROVIDED THEREIN OPERATIVE FOR SELECTIVELY COMMUNICATIVELY DIRECTING THERETHROUGH FOR THE PROPELLING MOTORS THE FLUID FLOW FROM ONE OR MORE OF THE VARIABLE VOLUME OUTLETS OF SAID SOURCE, A DIRECTIONAL FLOW VALVE HAVING MEANS THEREIN OPERATIVE FOR CONTROLLING THE FLOW THERETHROUGH SO AS TO CAUSE SAID PROPELLING MOTORS TO OPERATE FORWARDLY OR REVERSELY OR ALTERNATIVELY IN NEUTRAL WITH FLUID TO SAID MOTORS BLOCKED, AND A SERIES-PARALLEL CONTROL VALVE HAVING MEANS THEREIN FASHIONED TO PROVIDE INTERCONNECTIBLE FLUID FLOW PASSAGES THERETHROUGH AND BEING MANIPULATIVELY ARRANGEABLE SO THAT IN ONE POSITION THEREOF THE FLUID FLOW WILL EFFECT PARALLEL OPERATION OF THE PROPELLING MOTORS AND IN ANOTHER POSITION THE FLUID FLOW WILL EFFECT SERIES OPERATION OF SAID MOTORS.