Specifications Information and Repair Parts Manual
4851-97 & 4861-97
4861-250-00
2
6/2016
MAINTENANCE
Disconnect from power source before servicing or inspecting pump for
any reason. Failure to do so could result in fatal electrical shock!
MECHANICAL SEAL REPLACEMENT
Refer to Figures 2, and 3
IMPORTANT:
Always replace both seal seat (Ref. No. 7) and seal head (Ref.
No. 6) to ensure proper matching of components!
1. Unthread fasteners (Ref. No. 8), remove casing (Ref. No. 12) and casing
seal (Ref. No. 11).
2. Unscrew fastener (Ref. No. 10) from impeller (Ref. No. 9) and remove
impeller.
3. Remove fasteners (Ref. No. 2) and washers (Ref. No. 3) and remove
adapter (Ref. No. 5).
4.
Lay adapter face down on a flat stable surface and press seal head from
adapter.
5. Pry seal seat from rear of impeller with a screwdriver or other suitable
means.
6. Clean recess in adapter for seal head and recess in impeller for seal seat
before inserting any new parts.
7. Inspect polished face of seal seat and head to besure each piece is clean
and not marred.
8. Press new head into recess in adapter. A sealing compound (such as
silicon or Permatex) may be used to assure a water tight fit on outside of
head.
9. Press seal seat squarely into cavity in impeller (See Figure 2). If seal seat
does not press squarely into cavity, it can be adjusted in place by pushing
on it with a piece of pipe. Always use a piece of cardboard between
pipe and seal seat to avoid scratching face of seal seat. This is a lapped
surface and must be handled very carefully.
10. After seal seat is in place, check that it is clean and has not been scratched
or cracked.
11. Mount adapter on motor mounting face.
12. Replace impeller providing 0.020” clearance between adapter and
impeller (see figure 2), then tighten impeller fastener.
13. Place casing seal on adapter and replace casing. Replace and tighten
fasteners.
14. Before operating make certain impeller turns freely and is not rubbing
casing.
3/4-Inch Bronze Centrifugal Pump
Figure 2
