Repair or Replacing Pump Parts

The NAPCO rotary gear pump will eventually lose operational efficiency as a result of wear of the moving parts. A bearing housing/side cover can be easily removed in order to observe the condition of the gears and inner pump chamber and determine whether any parts need replacement.

Whenever a bearing housing/side cover is removed and/or shafts and gears are replaced, it is extremely important, when pulling out or re-inserting the shafts, that care be taken that the shaft ends do not nick, damage or dislodge the seals and bearings in the bearing housing/side covers. Any such damage or movement will cause the pump to leak and quickly fail. NAPCO has tapered the ends of the shafts to facilitate their removal and insertion through the seals and bearings. Napco also recommends that a lubricant be applied to the tapered end of the shaft to further facilitate moving it through the seals and bearings. (See the “Repair/Installation Procedure” section below for further guidance on repair and maintenance.)