Pump having modular shaft bearings and seals

A pump having a modular shaft, bearing and seal design that can be removed while the pump remains in a mounted operating position, the pump comprising:

• a pump housing including a case, first and second endplates, and a plurality of bearing housings, the first and second endplates being attached to the case on opposite ends thereof and forming an internal cavity for enclosing a drive gear and an idler gear, the first and second endplates each having an upper channel, a lower channel and a plurality of endplate bores adjacent the upper and lower channels, the channels of the first endplate in axial alignment with the channels of the second endplate, the bearing housings each having an open end defining a bearing bore and apertures adjacent the bearing bore and in alignment with one of the endplate bores, the bearing housings attached to the endplates via fasteners extending through the apertures of the bearing housings and coupling with the endplate bores;
• a drive shaft extending through the upper channels of the first and second endplates and into the respectively attached bearing housings, the drive shaft having a clearance fit within the drive gear, the drive shaft including a key extending outwards into abutment with the drive gear to drive the gear;
• an idler shaft extending through the lower channels of the first and second endplates and into the respectively attached bearing housings, the idler shaft fit within the idler gear;
• first and second of the plurality of bushings located about the drive shaft, the first bushing located between the drive shaft and the channel of the first endplate, the second bushing located between the drive shaft and the channel of the second endplate;
• and
• third and fourth of the plurality of bushings located about the idler shaft, the third bushing located between the idler shaft and the channel of the first endplate, the fourth bushing located between the idler shaft and the channel of the second endplate, wherein detachment of one of the bearing housings from the respective endplate while the endplate remains attached to the case enables removal of the respective one of the drive and idler shaft exposed by the detachment and removal of the bushings about the respective shaft adjacent the detached bearing housing.