STA-RITE SCC10300320M-01 Manual Del Usuario página 6

Maintenance
5. Remove 4 cap screws (Key No. 55H) and remove the
seal bracket from the bearing bracket (Key No. 19).
USE CARE – the lower silicon carbide seal (Key No.
21) will come off with the bracket. Tap around the
parting line with a lead hammer or a mallet to
loosen the bracket. Make sure that you don't damage
the shaft getting the seal bracket off.
6. Remove the seal bracket O-Ring (Key No. 47C) and
clean the O-Ring groove.
7. Remove the seal retaining ring screws (Key No. 55B)
from the seal bracket and remove the seal retaining
ring.
NOTE: The mechanical seal (Key No. 21) consists of
5 parts - the upper and lower silicon carbide seals,
two rotating silicon carbide seals, and the spring. Be
sure that you do not scratch or mar the shaft when
removing the seals. If the shaft is marred, it must be
dressed smooth with fine emery or crocus cloth
before installing the new seal. Do not reduce the
shaft diameter.
8. Pull and turn the rotating seal halves to remove them
from the motor shaft. If necessary, use a flat blade
screwdriver to help pry the seals from the shaft. Be
careful to avoid scratching the shaft.
9. Unscrew four cap screws and remove the bearing
bracket from the motor frame (Key No. 16).
10. Use a flat blade screwdriver and very carefully pry
the lower silicon carbide seal from the seal plate
cavity.
11. Use a flat blade screwdriver and very carefully pry
the upper silicon carbide seal from the bearing
bracket cavity.
Installing the New Shaft Seal
NOTE: Install all new O-Rings, seals, and gaskets during
reassembly. It is good practice to replace the O-Rings
each time the pump is serviced.
1. Clean the seal cavities in the bearing bracket and
seal plate.
2. Lubricate the seals with a very small amount of
clean oil.
3. Inspect the shaft for nicks and scratches.
4. With finger pressure only, press the stationary seal
halves firmly and squarely into the seal cavities in
the bearing bracket and seal plate, with the polished
face out.
NOTE: Be sure you do not scratch the seal surface.
5. Reinstall the lower seal retaining ring.
6. Reinstall the bearing bracket on the motor. Use a
new O-Ring.
7. Slide the rotating seals and the spring (Key No. 21)
onto the shaft.
NOTE: Be sure you do not scratch the seal surface.
Be careful that the shaft shoulder does not damage
the seal faces when they are passing over the shaft.
Make certain the polished surfaces of the rotating
seals face the mating surfaces of the stationary seal
halves.
8. Clean the O-Ring groove in the bearing bracket and
install a new O-Ring (Key No. 47C).
NOTE: It is good practice to replace the O-Rings
each time the pump is serviced.
9. Reinstall the seal bracket, lock washers, and cap-
screws.
10. Reinstall the shaft washer (Key No. 53E) and the oil
seal (Key No. 25) on the impeller hub.
11. Reinstall the impeller key (Key No. 46) in the key-
way on the shaft.
12. Using the key as a guide, reinstall the impeller on
the shaft.
13. Reinstall the volute on the seal plate.
14. Refill the bearing bracket with clean dielectric oil
(P/N U197-8A) and replace the fill. plug.
15 . Stand the pump on its feet. Check for free rotation of
the impeller. The pump is ready for installation in the
pit.
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