4.
Reassemble the pump and realign the coupling as specified in the alignment instructions.
5.
Switch the motor leads in order to reverse the motor rotation.
If you do not reverse the motor rotation, then the impeller will not rotate in the right direction.
6.5.3 Remove the upper half of the casing
1.
Drain the pump by opening the vent plug and removing the drain plugs on the suction and dis-
charge nozzles.
2.
Remove the coupling guard and separate the coupling in order to disconnect the pump from the
driver.
3.
Remove the seal lines.
Not all pumps are supplied with seal lines.
4.
For pumps with packing, remove the gland bolts, washers, and gland from each stuffing box.
5.
For pumps with mechanical seals, remove the gland bolts and slide the gland away from the casing.
6.
Remove all casing main joint capscrews and dowels.
7.
Insert a screwdriver or pry bar into the slots between the upper and lower casing halves and sepa-
rate the halves.
6.5.4 Remove the rotating element
1.
Tap the stuffing boxes with a soft-headed hammer in order to break the seal between the stuffing
box and lower half of the casing.
2.
Remove the capscrews that hold the bearing housings to the casing.
3.
Lift the rotating element out of the lower half of the casing.
4.
Move the rotating element to a suitable working location.
A spare rotating element can be installed at this point.
5.
Pull the coupling half and key off the shaft.
Figure 29: Rotating element
6.5.5 Disassemble the pump
1.
Remove the capscrews (371C) from the bearing covers (109 and 119).
2.
Remove the bearing housings (134), locknut (136), and lockwasher (382).
3.
Mount a bearing puller and remove the bearings (168 and 410).
4.
Remove the thrust washer (535) and snap rings (276).
Inboard bearings do not use a locknut, lockwasher, or thrust washer.
NOTICE:
Do not reuse bearings if removed from shaft. Doing so may result in equipment damage. Re-
place the bearings before reassembly.
5.
Remove the bearing covers (109 and 119) and push the bearing isolators out of the bearing covers
and the coupling-end of the bearing housing (332A and 333A).
6.
For pumps with mechanical seals, do the following:
a) Remove the glands.
6.5 Disassembly
Model 3409 Installation, Operation, and Maintenance Manual
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