Maintenance Waukesha Cherry-Burrell
Page 44 95-03009 10/2010
Assembly of a Pump With Pre-assembled (Cartridge)
Seals
1. Place the shims, backplate and impeller on the shaft assembly.
Hand-tighten the impeller retainer bolt on the shaft.
2. Check the impeller/backplate clearance with the backplate held firmly
in position against the motor adapter. Check the space between the
back of the impeller and the backplate with a feeler gauge (0.030"
nominal) while holding the backplate tight against the bearing housing
flange. Any axial movement of the shaft should not be added to the
0.030" nominal clearance (Figure 55). If needed, change this clear-
ance by adding or remov
ing shims. S
hims (Figure 54, item A) are
added on the drive shaft behind the impeller shaft (Figure 54, item G).
3. Confirm the operating clearances by clamping the casing to the bear-
ing housing flange and rotating the shaft/impeller manually to be sure
the imp
eller does not touch the casing or backplate.
4. When the proper shim pack is confirmed, remove the casing, impeller
and ba
ckplate, leaving the shim pack on the shaft.
5. Insert the L-gasket into the backplate (Figure 56, items B and C).
6. Insert the cartridge adapter (Figure 56, item A) into the backplate
(Figure 56, item C) and tighten with four socket head cap screws (Fig-
ure 56, item D).
7. Install the cartridge seal unit and use the re
taining bolts (Figure 57,
item B) and flat washers (Figure 57, item A) to secure the unit to the
cartridge adapter. Do not tighten the retaining bolts yet.
CAUTION:
Be sure the removable lugs/spacers that position the
rotating part of the seal in the housing are in place at this time.
8. Apply FDA-approved anti-seize compound to the shaft.
Figure 55 - Clearance Between Impeller
and Backplate
Figure 56 - Insert L-gasket, Fasten
Adapter in Place
Figure 57 - Fastening Seal Unit in Place
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