Hydrostatic drives

In a hydrostatic drive consisting of at least two component systems, each of which has an adjustable pump, a delivery line coming from each pump, a plurality of consumers connected to at least one of said pumps through branch lines, a return line connected to said at least one of said pumps from said consumers and an adjustable restrictor in each of the branch lines, an adjusting element in each restrictor loaded on one side by an arbitrarily regulatable pressue, the improvement comprising means whereby the adjusting element of each restrictor is loaded on the other side by the pressure in the branch line between the restrictor and the consumer, pump adjusting means loaded by the pressure gradient at at least one of the restrictors, a control pressure line leading to the adjusting element of said at least one of the pumps which branches off from the branch line between the restrictor and the consumer, a check valve provided in said control pressure line opening toward the adjusting element of said at least one of the pumps and coupling means including hydraulically controlled valve means for selectively connecting together both the delivery lines and the control pressure lines of each of the pumps whereby when the valve means is in a closed position, each of the delivery lines is separated from each other and each of the control pressure lines is separated from each other and when in an open position, all the delivery lines are connected with each other and all the control pressure lines are connected with each other.