①The tooth gap between the inner and outer rotors is too large, which makes the suction and pressure oil chambers communicate with each other, the volumetric efficiency is significantly reduced, and the output flow is insufficient.
②The axial clearance is too large;
③The sealing of the joint surface in the oil suction pipeline is not tight, so that the pump sucks air and the suction flow is reduced f
④ The oil absorption is not smooth, such as the oil viscosity is too large, the oil filter is blocked by dirt, etc., which will reduce the suction flow;
⑤ The relief valve is stuck in the half-open position, and part of the flow from the pump returns to tank 1 through the relief valve, so that the flow into the system is insufficient, and the system pressure cannot be increased at this time.
