Finish Thompson SP10 SERIES SELF-PRIMING - Manual (Page 11)

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12. Pull on one of the 3 prongs to remove the barrier (item
11) from the clamp ring and motor adapter (items13 &
15). NOTE: Prongs are sharp. Use a glove or rag for
better grip. Motor adapters have an o-ring seal between
the barrier and adaptor so fit may be snug. See figure
21. Inspect the inside and outside of the barrier for
signs of rubbing.
Figure 21
13. Remove the o-ring (item 4) from the barrier and inspect
for chemical attack, swelling, brittleness, cuts, etc.
14. Visually inspect the outer drive (item 17) for rubbing,
damage, corrosion, or loose magnets.
Outer Drive Replacement
1. Remove the setscrews (item 17B) from the side of the
drive (NEMA motors) or the bolt, lock washer and flat
washer (items 25, 26 & 27) from the center of the drive
(metric motors).
WARNING: Be careful, tools will want to be attracted
to the magnets.
2. Remove the drive magnet from the motor shaft by gen-
tly prying up from the bottom of the drive. See figure 22.
3. To reinstall the drive or a new drive, follow the instruc-
Figure 22
tions from Section I – Assembly, Pumps without
Motors, Steps 4-6.
Thrust Ring Replacement
1. The thrust ring (item 8A) is held in-place with a snap fit
with a ridge. Using a razor, knife, or side cutters, cut
a notch out of the thrust ring. Pull ring up and out of
the holder. See figures 23 & 24.
2. To reinstall, align the two flats on the thrust ring with
the flats in the bore of the impeller. Using a piece of
wood, press into place using an arbor press until the
thrust ring is completely seated in the impeller.
Bushing Replacement
To remove the bushing, place the impeller/inner drive as-
sembly in an arbor press. Insert a 7/16” diameter plastic or
wood shaft through the eye of the impeller and press the
bushing out.
To replace the bushing (item 9A), place the top of the
impeller on an arbor press with the thrust ring face down.
Insert the front of the bushing (see figure 25) into the center
of the impeller/inner drive magnet assembly. Press into
place until the bushing reaches the shoulder molded into
the inner drive. See figures 26 & 27.
Figure 23 Figure 24
Figure 25 Figure 26
Figure 27