The cycloid gear pump is an internal meshing gear type oil pump with a certain discharge volume. In fact, the discharge amount and pressure change in a straight line when the number of revolutions is fixed, and the discharge volume is maximum when there is no pressure. The driving force is proportional to the pressure, and the driving force is maximum when the pressure is maximum. Therefore, when operating with the discharge side closed, the oil pump may be damaged, the motor will be overloaded, etc., so please use it with caution.