The utility model discloses a bulldozer
pilot hydraulic
system, and belongs to the technical field of bulldozer
hydraulic pressure, the bulldozer
pilot hydraulic
system comprises a hydraulic
oil tank, a
pilot pump, an overflow valve group, an energy accumulator, a
ball valve, a pilot
handle and a main valve, a liquid inlet of the pilot pump is connected with the hydraulic
oil tank through a pipeline, and a liquid outlet of the pilot pump is connected with the overflow valve group through a pipeline; the overflow valve
bank conveys residual hydraulic oil in the pipeline into the hydraulic
oil tank again, an energy accumulator is further arranged on the overflow valve
bank, the end, away from the pilot pump, of the overflow valve
bank is connected with the
ball valve through a pipeline, and the end, away from the overflow valve bank, of the
ball valve is connected with the pilot
handle through a pipeline. And the pilot
handle is connected with the main valve through a pipeline. The energy accumulator is arranged on the overflow valve set, when the bulldozer flames out, pressure in the energy accumulator is released, hydraulic oil in the pipeline is conveyed into the pilot handle through the pressure of the energy accumulator, the main valve is controlled through the pilot handle, and the scraper knife is restored to the initial state.