b) Loosen the setscrews and remove the head assembly of the mechanical seal.
c)
Press the mechanical seal seats from the glands.
7.
Remove the casing rings (127) from the impeller (101).
8.
Remove the setscrew from the shaft nuts.
9.
Remove the shaft nuts, O-rings, sleeves, sleeve gaskets, and the impeller.
10. Apply heat uniformly to the shaft sleeve to loosen the sealant between the shaft and sleeve.
Do not heat the shaft sleeve to temperatures above 275°F (135°C). To further assist in removing the
sleeves, hold the shaft vertically and tap it on a block of wood. The weight of the impeller will force
both the impeller and sleeve from the shaft.
11. If the pump is equipped with adjustable rings, then refer to
6.6.2.2 Replace the wear rings on page
for instructions on removing the rings.
12. If the impeller has replaceable rings, then cut the rings (142) with a cold chisel in order to remove
them.
126
142
127
445A
100
101
Figure 30: Pump disassembly
6.6 Preassembly
6.6.1 Replace wear parts
When you reassemble the pump, make sure to do the following:
•
Replace all bearings, O-rings, seals, gaskets, impeller rings, casing wear rings with new parts dur-
ing assembly.
•
Clean all reusable parts of foreign matter.
•
Make the main casing joint gasket by using the upper or lower half as a template:
1.
Lay the gasket material on the casing joint and mark it by pressing it against the edges of the
casing.
2.
Trim the gasket so that it is flush with the inside edges of the casing.
6.6.2 Adjustable wear rings
Adjustable rings
are an assembly of two threaded rings. The outer, stationary ring
is held in the casing by a flange and an anti-rotation pin in the lower half of the main joint. The inner,
6.6 Preassembly
46
Model 3409 Installation, Operation, and Maintenance Manual
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