Supplementary feeding for hydrostatic transmission circuit

The circuit has a motor assembly (230) connected to a hydraulic pump (212) by a return line (206). A force-feeding pump (214) deducts fluid in a fluid reservoir and forcedly supplies the fluid to the circuit at a level of a series line (204). An exchange block (260) extracts the fluid injected by the force-feeding pump. An additional force-feeding line (250) deducts the fluid outletting from the exchange block, and forcedly supplies the fluid to the circuit at the level of the series line.