The XB400P has been specifically designed to pump slip with maximum efficiency from an external mount system.
Due to the fact that slip is exposed to the shaft and bearing surfaces, there is no way to totally eliminate frictional wear of
some parts. Slip is one of the most abrasive liquids, and we simply have to take some preventative measures to keep the
wear to a minimum.
During assembly, each new XP400P is test run to insure that the alignment of all parts and the packing tension is
as perfect as possible. True alignment and packing tension greatly extends pump life.
Once the pump is put into service, a short break-in period begins. It is possible that the packings (LP2) that are
located inside the throat of the housing (LP44) may need to be adjusted. Even as slight wear begins, a drop of slip may
seep out from around the shaft and drip from the end of the packing retainer (LP33). If this occurs, simply tighten the tension
on the packings (LP2) by adjusting the packing retainer screws (LP1). Even a quarter inward turn of the screw can add
enough pressure to seat the packings properly. Do not over tighten the packings.
With each new XP400P, we provide an extra set of packings (LP2) and an extra housing bushing (LP55). These
parts are to be used as replacements to extend the life of the pump as long as possible. As pump usage continues, the
parts will wear and further packing adjustment may be required. Eventually, the new bushing (LP55) and packings (LP2)
can be installed.
Use an 1/8” allen wrench to loosen the set screws on the flexible coupling (2x497) and the set collar (LP13). Next,
loosen the tension on the packings by adjusting the packing retainers screws (LP1) outward. Then, remove the suction
cover (LP88), and the shaft and impeller (LP66) can be removed by pulling it out. This exposes the inside of the housing
(LP44) and the bronze bushing (LP55). Remove the bronze bushing from its slightly pressed-in position and insert the new
one. Then, reassemble the pump using the reverse order.
Once the pump is assembled with the new parts in their proper places, it will provide many additional hours of
service. Eventually, as slip wears the pump shaft and bushings, it will get to the point that they can no longer be rebuilt. At
this point, the pump has reached its total useful life and will have to be replaced.