Teikoku USA | Chempump
Instruction Manual G-Series
24
17. Reassemble pump by reversing the disassembly procedure,
replacing old gaskets with new ones. BE SURE TO TAKE UP
EVENLY ON BOLTS SECURING BEARING HOUSING. Other-
wise, the housing may skew and misalignment will cause
rapid bearing wear. Bolt torque values by model are provided
in
Appx. C., Page 31
.
18. Complete reassembly. Before bolting the motor section to
the pump casing, spin the rotor impeller assembly by hand to
ensure that it does not bind. Check end play again as noted
in
Table 4-3
before reassembling the rear bearing housing
to the stator assembly but after bolting the pump casing to
motor section.
19. In reattaching the impeller nut to rotor assembly it is vital that
the impeller nut be tightened to proper torque to lock the
nut onto the threads. The Proper torque values are: Models
GA, GB, GC, GVBS: 12 FT-LBS. Models GVD, GVE, GVHS, GG
GM: 75 FT-LBS.
4.5.4 Models GLD Recommended Tools for
Disassembly
Table 4-7. Recommended Tools
Size
Description
1/2" and 9/16"
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).
1/2" Drive, 1 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
4.5.5 Models GLD Disassembly and Reassembly
Unlike the other G-Series models covered by this manual, the
Model GLD is a two-stage model and as a result disassembly and
reassembly instructions are a bit different. The step by step pro-
cedure is as follows:
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 evidence
of 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 bolt s holding rear bearing housing and then remove
the housing.
8. Remove the screw and lock washer holding the rear bearing
to the rear bearing housing and then remove the rear bearing.
If the pump is equipped with a bearing wear detector, please
refer to
Table 2-1
prior to removing the rear bearing.
9. Check end play as indicated in
Table 4-3
.
10. Then, moving to the front of the unit, remove bolts holding
pump casing cover plate to pump casing, and then remove
cover.
11. Remove the exposed impeller nut (left hand thread) and then
the impeller, and key (second stage impeller). Second stage
impeller has tapped pull holes for easy removal and for hold-
ing impeller when removing impeller nut.
12. Remove the spacer sleeve from the shaft.
13. Remove bolts holding motor section to pump casing.
14. 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 front end of the rotor
shaft is clear of the casing. Then, rotate the motor section
and cradle to a point which will allow further disassembly
of the unit. This specially constructed base, which is fur-
nished as standard on all G-Series models, allows inspec-
tion or maintenance to be performed on the unit without
its having to be removed to a workbench or without the
motor 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 pro-
tect the parts.
b) If a base is not supplied, remove the motor section, and if
necessary, disconnect the power cable from the connec-
tion box if the unit is to be taken to a workbench.
15. Slip off the first stage impeller and remove the key from the
shaft.
16. Withdraw the rotor assembly from the rear of the motor
section, taking care not to allow the rotor or shaft to hit the
stator liner.
17. Remove the three screws retaining the front bearing housing
to the stator assembly and then remove the housing.
18. Remove the screw and lock washer holding the front bearing
to the front bearing housing and then remove the bearing.
19. Slip out the idler bearing from the pump casing.
20. A check for bearing wear can be made at this point. See
Table 4-2
.
21. Reassemble pump by reversing the disassembly procedure,
replacing old gasket s with new ones. BE SURE TO TAKE UP
EVENLY ON ALL BOLTS SECURING BEARING HOUSING. Oth-
erwise, the housing may skew and misalignment may occur,
