Finish Thompson UC (S/N 125040 and lower) - Manual (Page 14)

14
Replacing Wear Components
Use the following procedures to replace any wear components that are excessively worn, cracked or broken.
Shaft Support/Front Thrust Washer
Removal
1. Remove the casing (item 1) from the base plate and piping.
2. Place the casing in an arbor press with ETFE lining side down.
3. Place arbor on the nose of the front shaft support (item 2) and carefully
press the front shaft support out of casing (see figure 15).
Installation of Replacement Support/Front Thrust Washer
1. Place the casing in an arbor press with the suction flange down.
2. Put front thrust washer into new shaft support.
3. Position the front shaft support in the bore of the casing suction and align the anti-rotation pins on the front shaft
support with the blind holes in the casing.
4. Press evenly on the face of the plastic shaft support with a soft-faced arbor until the front shaft support is
fully seated in the bore.
6. Check the impeller drive assembly (item 4) for cracks or grooves larger than .02 inch. If a fluid comes in direct
contact with the magnets, the magnets may swell, cause rubbing, and damage the barrier assembly (item 6).
7. Inspect the barrier assembly for signs of abrasion. Replace the barrier assembly if there are grooves or
scratches that are deeper than .04 inch.
figure 15
Impeller Thrust Ring
The impeller thrust ring is located in the front of the impeller shroud.
Removal
1. The impeller thrust ring (item 3A) is removed by grabbing the top of the ring
with pliers and pulling with a twisting motion. Be careful not to damage the
bore or face of the front impeller shroud (see figure 16).
Note: A new impeller thrust ring will be required after removal.
Replacement
1. Place the impeller and impeller drive assembly (items 3,3A, 4,4A, 4B, 4C) on a table
with the suction side facing up.
2. Position the replacement impeller thrust ring in the bore of the front shroud with the snap fit ridge
towards the bottom of the bore (see figure 17). Align the anti-rotation flat on the impeller thrust ring
with the flat in the impeller shroud.
3. Place the impeller and impeller drive assembly in an arbor press. Using a soft faced arbor, gently
press the impeller thrust ring into place.
figure 16