Finish Thompson STTS - Manual (Page 8)

6
Inspection
1. Inspect the shaft locating hole in the center of the bottom bearing (item 13 on the TTS/TTC and 16 on the
STTS. If the inside diameter is .400 or larger than replace it.
2. Visually check the all the compressors (item 9 on TTS/TTC and item 12 on STTS) for damage. If they need
replaced, you must remove the pin first.
3. Visually inspect the center bearings (item 12 on TTS/TTC or item 15 on STTS), the spacers (item 10 on
TTS/TTC or item 13 on STTS), and the impellers (item 8 on TTS/TTC or item 11 on STTS). Replace as
needed.
4. Never reuse the seal assembly (item 4). Always install a new seal during reassembly.
5. Inspect the bearing assembly (item 3), and replace if needed.
6. Inspect the pump shaft for wear in the seal area, the center bearing area, and the bottom bearing area. Re-
place if needed.
Reassembly
1. With the center bearings, compressors, spacers, and impellers in place on the shaft, insert the shaft up
through the bottom of the TTS/TTC intake tube (up through the bottom of the bearing housing on the
STTS).
2. Warm up the seal assembly (item 4) prior to installation by using a heat lamp or soaking them in hot water.
This will aid in the ease of proper seal installation. Make sure there are no metal burrs on the pump shaft in
the bearing hole location or the coupling half setscrew location that could “cut” the seal during installation.
3. Lubricate the end of the shaft with Vaseline to aid in the seal installation. Carefully install the seal down
over the shaft with the two “slots” facing up toward the bearing assembly. The raised lip in the center of the
seal (that faces the bottom of the pump) must go on straight and not buckle on one side.
4. After the seal is on the shaft correctly, install the bearing assembly (item 3) onto the shaft. Use the bearing
assembly to push the seal further down the shaft until the hole in the center of the bearing assembly matches
up to the hole in the shaft. Install the roll pin through the bearing assembly and shaft.
5. Turn pump intake tube (bearing housing on the STTS) upside down and press on the shaft end to slide the
bearing assembly into the pump head (bearing housing on the STTS). Use a block of wood and a mallet if
needed to drive the assembly into the pump head.
6. Install the coupling (item 2) on the end of the shaft and tighten the set screw into the dimple on the shaft.
7. On STTS models insert the shaft assembly into the intake tube from the top, making sure to install the union
nut gasket (item 7) and tighten the union nut (item 5).
8. Reinstall the bottom bearing (item 13 on TTS/TTC and item 16 on STTS), and gently bend the four “feet” in
slightly to keep the bottom bearing in place on the TTS and STTS models.
9. Turn the pump coupling to insure there is no binding.
Note: Repair instructions can be downloaded from our web site at www.finishthompson.com or contact Technical Service at
1-800-888-3743.