Finish Thompson UC (S/N 125040 and lower) - Manual (Page 13)

13
Examination
The first scheduled inspection should take place after the first three months or approximately after 2000 hours of run
time. This is to insure that there is no damage from any solids or particulate, cavitation or run dry. Reinspect after six
to twelve months depending on the results of the initial inspection.
Note: All pumps should be checked for leaks on a regular basis. If any leaks are detected, the pump should be repaired
immediately.
Note: A new o-ring (item 12) will be required after pump inspection. If the drain flange is removed, replace the gasket
(item 11A)
1. Inspect the bushings (items 4A, 4B) - The silicon carbide parts will not wear under
normal operation. Polishing on a silicon carbide surface is a normal occurrence
and usually does not require replacement. Check for signs of melting around the
perimeter of the bushings. Make sure that the spiral groove on the bushing ID is
not plugged. Check for chips or cracks on the rear face. Check bushings for wear
(see figure 13). If the bushings appear worn, follow the steps listed in the section
“Replacing Wear Components, Impeller Bushings.”
2. Check for cracks or excessive wear on the shaft (item 5), impeller thrust ring (item 3A) and rear sealing ring
(item 4C). Replace if cracked or excessively worn (see figure 14).
3. Check for signs of deformation or melting in the shaft support (item 2) and the barrier liner where the pump shaft is
positioned. Dry running the pump during its initial start-up or operation can cause heat-related damage to these
components.
4. Inspect the casing liner. It is important that there are no abrasions or cuts deeper than .04 inch in the lining. These
cracks may occur if the lining is corroded or abraded. Liner damage can usually be detected visually. Some hairline
cracks require an electrostatic discharge tester to detect.
5. Locate the impeller vanes (impeller is item 3). Make certain that there are no obstructions. If there is an obstruction in
any of the flow paths, then an imbalance may cause excessive wear on the pump shaft and impeller bushings.
Disassembly
1. Using a 9/16” socket, remove the (4) 3/8” hex head cap screws (item 16) between the motor adapter (item 9) and
motor flange (item 10). Remove the motor adapter by slipping it over the drive hub (item 8).
2. For pumps with 145TC, 184TC, 215TC & 256TC NEMA motors - loosen both set
screws and remove the outer drive. For pumps with 90, 100/112 and 132 frame
motors - remove the bolt and washers in the end of the motor shaft and remove the
drive.
For pumps with an 160 frame motor - loosen and remove the bolt and washers in
the center of the drive retainer, and pull the drive retainer off the end of the motor
shaft. Loosen the setscrews on the outer drive and remove the drive from the motor
shaft.
3. Remove the (4) fasteners between motor flange and the motor and remove motor flange from motor (see figure 12).
figure 12
figure 14
figure 13