Patent ID: 6461118
Filing Date: 2002-10-08
Classification: F01M,F04C

Abstract:
A fluid pump for use in a prelubrication system comprising:a. a pump housing having a pump cavity; b. a first and second gear positioned in said cavity for pumping fluid, said first gear being operably connected to a motor for rotation and said second gear rotatably mount to a shaft for geared rotation with said first gear; c. fluid inlet and outlet ports in communication with said cavity and adapted for connection with a source of fluid and a discharge means, respectively; and d. a bypass means positioned between said inlet and outlet ports, said bypass means having a control valve to permit fluid to be pumped between the inlet and outlet ports or to pass through said bypass means, said bypass means being closed to fluid pumped by said first and second gears to flow from said inlet port to said outlet port during a prelubrication or a fluid change, and being opened to permit the oil to cavitate in response to said control valve during operation of the pump when said prelubrication or fluid change is not selected.