Teikoku USA | Chempump
Instruction Manual G-Series
23
Shutdown pump, drain unit, remove the circulation tube and
clean it with clean, oil-free, compressed air. If the unit still runs
hot, or if tube was clear, disassemble unit and inspect.
Caution!
Between cycles of pumping fluids which may solidify, such
as caustic soda, flush the system with steam, water or the
proper solvent to prevent the piping and internal passages
of the pump from plugging up. Where the pump is fitted
with a discharge filter, flush pump during off cycles and
check discharge filter for plugging.
4.5 Disassembly and Reassembly
4.5.1 Models GA, GB, GC, and GVBS Recommended
Tools for Disassembly
Table 4-5. Recommended Tools
Size
Description
1/2" and 9/16"
Open end, box end wrench for circulation
tube fitting, pump casing and rear bearing
retainer bolts.
5/8"
Socket for impeller nut.
5/32" and 3/16"
Allen wrench for front bearing retainer
screws.
3/8"
Open end, box end wrench for stator
assembly retaining screws (WHIZLOCK).
3/4"
Open end, box end wrench for base cradle
retaining bolt (WHIZLOCK).
5/8"
Open end, box end wrench for relief valve
top.
7/16"
Open end, box end wrench for pump
casing drain plugs.
4.5.2 Models GVD, GVE, GVHS, GG and GVM
Recommended Tools for Disassembly
Table 4-6. Recommended Tools
Size
Description
5/8" and 11/16"
Open end, box end wrench for circulation
tube fitting.
3/4"
Open end, box end wrench for pump
casing, rear bearing housing and base
cradle retaining bolts (WHIZLOCK).
1-1/8"
Socket for impeller nut.
5/32" Hexwrench
Socket flat head cap screws for front
bearing housing retaining screws.
3/8"
Open end, box end wrench for stator
assembly retaining screws (WHIZLOCK).
5/8"
Open end, box end wrench for relief valve
top.
9/16" and 5/8"
Open end, box end wrench for pump
casing drain plugs.
7/16"
Open end, box end wrench for bearing
assembly retainer screws
4.5.3 Models GA, GB, GC, GVBS, GVD, GVE, GVHS, GG,
GVM Disassembly and Reassembly Procedures
1. Close discharge valve, shutdown pump, and then close the
suction valve.
2. Disconnect the power cables from the connection box prior to
disassembly (WARNING: PERSONNEL SAFETY HAZARD WILL
EXIST IF THIS STEP IS NOT FOLLOWED.)
3. Drain pump.
4. Begin disassembly, carefully examining each part for corrosion
or wear.
5. Remove circulating tube, back flush piping, or reverse circula-
tion piping if so equipped.
6. Remove water jacket cooling inlet and drain connections, if
used.
7. Remove bolts holding rear bearing housing to stator assembly
and then remove the housing.
8. Remove the screw and lock washer holding the rear bearing
to rear bearing housing, and then remove the rear bearing.
9. Check end play as indicated in
4.2.3
.
10. Remove bolts holding motor section to pump casing.
11. a) If a base is provided, loosen one bolt and remove the other
which holds together the upper and lower sections of the
base assembly. Next, pull the motor section, resting on the
upper half or cradle portion of the base assembly, away
from the pump casing until the impeller hub is clear of
the casing. Then, rotate the motor section and cradle to
a point which will allow further disassembly of same. This
specially constructed base, which is furnished as standard
on all G-Series models, allows inspection or maintenance
to be performed on the unit without it having to be moved
to a workbench or without the motor section having to be
set on the floor or ground. If desired, the motor section
can be removed from the lower base section and taken to
another area for inspection. In this case, the upper half of
the base is used as a stand to protect the parts.
b) If a base is not supplied, remove the motor section and if
necessary, disconnect the power cable from the connection
box if the unit is to be taken to a workbench.
12. Remove the impeller nut (Models GA, GB, GC and GVBS have
left-hand threads; Models GVD, GVE, GVHS, GG, GVM, and
N2S have right-hand threads.) Then remove the impeller.
13. Withdraw the rotor assembly from rear of motor section tak-
ing care not to allow rotor to drop, thereby allowing shaft to
hit stator liner.
14. Remove the three screws retaining the front bearing housing
to the stator assembly, and then remove the housing.
15. Remove the screw and lock washer holding the front bear-
ing to the front bearing housing and then remove the front
bearing.
16. A check for bearing wear can be made at this time. Refer to
Table 4-2
.
