Fault cause: the end face of oil pump or the end face of driving and driven gear shaft sleeve is worn or scratched, and the unevenness of two shaft sleeve end faces is out of tolerance
Troubleshooting: replace the worn gear oil pump or oil pump shaft sleeve, when the wear is slight, the end face of the flat plate will be ground flat. The allowable unevenness error is 0.03mm; the end face of the upper shaft sleeve is lower than the pump body and the upper plane (the normal value is lower than 2.5 ~ 2.6mm). In case of out of tolerance, the lower shaft sleeve should be added with 0.1 ~ 0.2mm copper plate to compensate. When installing, it should be installed on the rear shaft sleeve. Related products: Vacuum Oil Filter Of Operation Method