Pentair PR AQUA ROTOFILTER Installation And Operation Manual page 36

36
SECTION 9: MAINTENANCE
20. Pre-assemble the new drum seal to the outer
ring by inserting all fasteners halfway through
the ring and drum seal. See Figure 27.
Figure 27. Drum seal pre-assembly
21. Align the seal assembly fasteners with the
corresponding rivet nuts on the inlet plate, while
pushing the drum seal onto the inlet trunnion
to form the proper right-angle seal. Start with
the top-left bolt and thread it into the rivet nut
by hand-tightening. Work your way around the
seal ring until all fasteners are threaded in and
hand-tight.
22. Ensure the seal is positioned evenly on the
inside of the drum trunnion and makes contact
all the way around. See Figure 28. Realign the
seal if necessary.
Figure 28. Incorrect (left) and correct (right)
drum seal alignment
PR Aqua Rotofilter Drum Filter Installation and Operation Manual
™
23. Starting at the top-left bolt, torque all bolts
until the seal compresses between the outer
seal rim and inlet plate by 0.32 centimeters
(0.125 inches).
24. The drum seal may have excess material that
must be trimmed off. Trim the excess material
from the drum seal by using the inside of the
inlet trunnion as a guide. See Figure 29.
Figure 29. Use the inlet trunnion to trim the seal
25. Trim the top ends of the seal using the filter
bypass as a guide. See Figure 30.
Figure 30. Use the bypass to trim the drum seal