Teikoku USA | Chempump
Instruction Manual NC-Series 0220
19
4. Maintenance
4.1 Recommended Tools for Disassembly,
Reassembly, and Inspection
Table 4-1. Recommended Tools Disassembly and Reassembly
Size
Description
9/16"
Open end wrench for circulation tube
fittings.
3/4: and 15/16"
Open end, box end wrench for pump
casing and adapter bolt.
3/4"
Open end, box end wrench for rear
bearing housing bolts and pump casing
drain bolts.
1 3/8"
Spanner wrench with 1/8" pin for shaft
sleeve retainer.
3/4"
Socket wrench for impeller nut (N1 and
N2 motors)
1 1/8"
Socket wrench for impeller nut (N3 and
N4 motors)
1 5/16"
Socket wrench for impeller nut (N5
motors)
1/2" and 9/16"
Open end, box end wrench for base cradle
bolts.
1/8"
Allen wrench for bearing retainer screws.
Wheel Puller
To assist in the removal of the impeller
assembly.
Table 4-2 Recommended Tools for Inspection
Size
Description
Dial Indicator
Dial Indicator (.200 travel) for determining
end play
Verniers
Telescopic gauges
5/16"-3"
4.2 Disassembly
(Please refer to cross section drawing located in the appendix)
1. Close discharge valve, shutdown pump, and then close the
suction valve.
2. Disconnect the power cables from the connection box prior to
disassembly. Follow Lock Out Tag Out.
Caution!
SAFETY HAZARD TO PERSONNEL WILL EXIST IF THIS STEP
IS NOT FOLLOWED.
4. Drain pump and connecting piping.
NOTE:
The NC-Series is designed to drain the majority of fluid in
the pump and motor, however a small amount of fluid will still
be present. Also, some fluid may remain in the heat exchanger
piping. Follow your plant safety regulations for flushing and
neutralizing the fluid in the pump prior to disconnecting pump
from the piping.
5. Begin disassembly, carefully examining each part for corrosion
or wear.
6. Remove heat exchanger cooling inlet and drain connections.
7. Remove circulating piping.
Caution!
Process fluid may be present when removing the piping.
9. Remove the four (4) bolts and nuts attaching the pump
assembly to the stand. Lift the pump off the stand utilizing
the four (4) eye bolts located on the pump casing. Support the
pump in the horizontal position.
10. Remove the screws holding the pump casing to the pump
casing adapter and remove the pump casing.
11. Remove the screws holding the rear cover plate to the stator
assembly and remove the coverplate
12. Insert two (2) ¼ - 20 puller screws into the rear bearing
housing and remove the rear bearing housing.
13. Remove the screw holding the rear bearing in the rear bearing
housing and remove the rear bearing
14. Remove the inducer by inserting a ¼” round bar into the hole
located on the body of the inducer. Use a strap wrench to
keep the impeller from rotating. Threads are right handed.
15. Remove the impeller and impeller key.
16. Remove the screws holding the balance plate assembly to the
pump casing adapter assembly and remove the balance plate
assembly. Note: The throttle bushing is located in the balance
plate assembly. To remove the throttle bushing compress and
remove the retaining ring.
17. Remove the screws holding the pump casing adapter to the
front end bell of the stator assembly and remove the pump
casing adapter.
18. Remove the screw holding the front bearing housing to the
front end bell and remove the front bearing housing.
19. Remove the screws holding the front bearing and the forward
thrust bearing and remove both items.
20. Remove the spacer sleeve, shaft sleeve and shaft key located
on the front end of the rotor assembly.
Note:
Sleeves are centered with "o" rings which may present
some resistance.
21. Remove the thrust bearing housing from the front end bell by
pushing the rotor assembly forward until the thrust bearing
housing is accessible. Note: the thrust bearing collar can also
be removed at this time.
22. Remove the screw holding the rear thrust bearing to the
thrust bearing housing and remove the rear thrust bearing.
23. Withdraw the rotor assembly from front of motor section
taking care not to allow rotor to drop, allowing shaft to hit
stator liner.
