Finish Thompson DB22 SERIES - Manual (Page 10)

10
2. Firmly grab the motor adapter and
pull straight out to dis-engage the
motor and pump. See figure 10.
NOTE: If the pump has the
optional o-ring sealing option
(available on 184 and 215 frame
pumps only), make sure o-ring (item
8B) does not fall out of the motor adapter (motor end).
3. Place pump on bench with housing (item 1) facing up. Using
a 19 mm socket, remove (10) M12 hex head cap screws, lock
washers and flat washers (items 11, 12, 13). See figure 11.
4. Pull housing straight up to remove. Impeller shaft (item 5)
may be lodged in the front shaft support. Inspect housing for
signs of wear or damage. Look for signs of rubbing, cracked
thrust ring or damage to front shaft support. See figure 12.
5. Remove impeller/inner drive assembly (items 3A, 3, 4, 4A).
Figure 11 Figure 12
Figure 10
See figure 13. Inspect impeller and
drive for signs of wear or damage.
Look for signs of rubbing, damage
and wear to the impeller and inner
drive. Check the impeller thrust ring
and bushing for wear. See figure 14.
Figure 13
Figure 14
Figure 15 Figure 16
6. Remove the impeller shaft (item 5) from the barrier and check
for signs of cracking, chipping, scoring or wear. See figure 15.
7. Remove the barrier (item 7) from the motor adapter (item 8)
(make sure the spindle has been removed). If necessary,
gently tap on the backside 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.
8. Remove the o-ring (item 6) from the barrier and inspect for
chemical attack, swelling, brittleness, cuts, etc.
9. Visually inspect the outer drive (item 9) for rubbing, damage,
corrosion or loose magnets.
NOTE: Inspect the o-ring (item 8A), for chemical attack, swell-
ing, brittleness, cuts, etc. Both NEMA and IEC pumps have o-ring
item 8A. If the pump has the optional o-ring sealing option
(available on 184 and 215 frame pumps only), inspect o-ring
item 8B (and item 10A if 215 frame).
Outer Drive Replacement
1. Remove the setscrews (item 9B) from the side of the drive
(NEMA motors) or the bolt, lock washer and flat washer (items
17, 18, 19) 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.
3. To reinstall the drive or a new drive follow the instructions from
“Section I – Assembly, Pumps without Motors, Steps 3 & 4”.
Thrust Ring Replacement
1. Thrust ring (item 3A) is held in-place with a snap fit 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 17
and 18.
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 com-
pletely seated in the impeller.
Figure 17 Figure 18
.020 min.
groove height
.780 max.
diameter