First, the pump can be driven without turning the cause analysis is as follows: 1, coupling failure; 2, belt slip; 3, the motor wiring is wrong; 4, motor damage; Second, you can not panic or plate up very heavy, the possible reasons are as follows: 1, because the starting pump temperature is too low, the pump oil viscosity is too high; 2, design and manufacture of pump stop too much oil. Too much oil caused by the pump back to the oil too much (too much fuel, or water vapor condensation in the pump, or condensate in the exhaust pipe back to the pump); 3, foreign body in the pump (intake pipe Of the welding slag, oxide; 4, rotary spring and other pump parts of the debris; 5, rotary deformation stuck; 6, occlusion occurred (copper sleeve, rotor, the wall, pump cover, stator, bearings).
