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 TM 55-1905-219-14-8
4-16.2. SEWAGE PUMP - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
REPAIR (Cont)
NOTE
The wear plate normally receives most of the wear. Pump efficiency will decrease
considerably when the clearance between the wear plate and the impeller exceeds .035
inch (0.089 cm). Normally shims can be added to bring the clearance within limits. Add
shims until rubbing just starts to occur with the impeller and cover or end plate are
secured in place. Then remove enough shims to back the impeller away from the wear
plate or cover a distance of 0.015 inch (0.038 cm). Install the cover and rotate the pump
by hand to make sure that the impeller is not binding or scraping. Minor nicks on the
edges of the impeller vanes can be removed by refinishing with a stone. If the impeller
and wear plate are worn excessively, they must be replaced. After replacement of the
impeller, wear plate, or impeller shaft, select shims to obtain the proper clearance
between the back of the impeller and the pump casing. If the impeller scrapes when the
cover is installed, add another gasket of sufficient thickness between the cover and the
pump casing.
4-636
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