A multiplexed hydraulic control system in which high force margins for the multiplexer are achieved by employing hydraulic oscillators as the multiplexer driving means. The multiplexer (20) is typically in the form of a hydraulic cylinder (25) having an input port (40) and a plurality of output ports (27,28,41-43), with an operator (26) in the cylinder (25) for individually connecting the input port (40) to the output ports (27,28,41-43). The hydraulic oscillator (30) is mechanically coupled to the multiplexer operator (26), and oscillation of the former causes oscillation of the latter to sequentially connect the input (40) to each of the outputs (27,28,41-43). Various means are taught for initiating reversal of the oscillator (30) and controlling the oscillation speed.