Finish Thompson DB6, 6H, 7, 8, 9, 10 Series - Manual (Page 9)

7. Remove the impeller shaft (item 6)
from the barrier and check for signs
of cracking, chipping, scoring or
wear. See figure 15.
8. Remove the barrier (item 7) from the
motor adapter (item 11) (make sure
the shaft has been removed).
If necessary, gently tap on the back
side of the barrier with a soft rod
(wood, plastic, etc). Inspect the inside
and outside of the barrier for signs of
rubbing. See figure 16.
9. Remove the o-ring (item 3) from the
barrier and inspect for chemical at
tack, swelling, brittleness, cuts, etc.
10. Visually inspect the outer drive (item 13) for rubbing, damage, cor-
rosion or loose magnets.
Outer Drive Replacement
1. Remove the setscrews (item 13B) from the side of the drive
(NEMA motors) or the bolt, lock washer and flat washer (items 21,
22, 23) 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 gently prying up from
the bottom of the drive. See
figure 17.
3. To reinstall the drive or a new drive
follow the instructions from Section I - Assembly, Pumps without
Motors, steps 5 & 6.
Thrust Ring Replacement
1. Thrust ring (item 4A) 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 18 and 19.
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/in-
ner drive assembly 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 5A), place the top of the impeller on an
arbor press with the thrust ring face down. Insert the front of the bush-
ing 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 20, 21, 22.
Figure 16
Figure 15
Figure 17
6
Figure 18
Figure 19
Figure 20 Figure 21 Figure 22
Impeller Replacement
To remove the impeller from the inner drive magnet, gently pry off by
hand or lightly tap on the back of the impeller.
To install a new impeller, place the inner drive magnet assembly face
up. Line up the patterns on the impeller
with the ones on the inner drive magnet
so they match and press into place by
hand. An arbor press can also be used
to press the impeller on the inner drive.
Place a piece of wood over the top of the
impeller thrust ring and push down on the
impeller until it is completely seated in
the inner drive. See figure 23.
Figure 23
Section VI - Reassembly
1. Place motor adapter (item 11) so the large flange is on the bench.
Rotate the adapter so the four holes in the smaller flange are in
the horizontal position. Install o-ring (item 10) in the groove. See
figure 24.
2. Install clamp ring.
For vertical discharge – Install the clamp ring (item 9) in the motor
adapter so the housing bolt holes (6 holes in clamp ring) are in
3:00 and 9:00 position. See figure 25.
For horizontal discharge - Install the clamp ring (item 9) in the
motor adapter so two housing bolt holes (6 holes in clamp ring)
are in 12:00 and 6:00 position. See figure 26.
Figure 24 Figure 25 Figure 26
3. Install (4) bolts, lock washers and flat washers (items 20, 19, 18).
Tighten evenly using a star pattern. Tighten to 60 in-lb (6.8 N-m).
See figure 27.
4. Install barrier (item 7) into motor adapter
and clamp ring assembly. Lubricate the
o-ring with a chemically compatible lubri-
cant, and install it in the groove in the
clamp ring before installing the barrier. See
figure 27A. Push barrier into place. See
figure 27B.
Figure 27
Figure 27A Figure 27B