An electro-hydraulic actuator includes a pump powered by a motor, a hydraulic actuator biased to a first state that reciprocates between the first state and a second state, a reservoir, and a hydraulic circuit. The hydraulic circuit includes a pressurizing flow path that supplies fluid from the pump to the hydraulic actuator, a discharge flow path that discharges fluid from the hydraulic actuator to the reservoir via an unloading valve, a pilot flow path that branches off midway through the pressurizing flow path and supplies fluid pressurized to a pilot pressure to the unloading valve, a mechanism that generates pilot pressure while the pump is operating, and a check valve that allows fluid to pass only from the pump to the hydraulic cylinder. The hydraulic circuit transitions to the second state when the pump is operating, and returns to the first state and when the pump is stopped.

An electro-hydraulic actuator includes a pump powered by a motor, a hydraulic actuator biased to a first state that reciprocates between the first state and a second state, a reservoir, and a hydraulic circuit. The hydraulic circuit includes a pressurizing flow path that supplies fluid from the pump to the hydraulic actuator, a discharge flow path that discharges fluid from the hydraulic actuator to the reservoir via an unloading valve, a pilot flow path that branches off midway through the pressurizing flow path and supplies fluid pressurized to a pilot pressure to the unloading valve, a mechanism that generates pilot pressure while the pump is operating, and a check valve that allows fluid to pass only from the pump to the hydraulic cylinder. The hydraulic circuit transitions to the second state when the pump is operating, and returns to the first state and when the pump is stopped.