Goulds Pumps 3910 11th ed. - IOM - Manual (Page 43)

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! CAUTION
For runout checks, firmly support bearing frame
assembly in horizontal position, as shown in Fig. 36.
11. Check impeller wear ring runout in the following
manner:
a. Install impeller key (178) on shaft (122) of
assembled bearing frame from which the seal
chamber cover (184) has been removed, and on
which the runouts have been determined to be
within the specifications established in
Reassembly section. Key should be at top (12
o’clock) position for installation of impeller (101).
b. Install impeller (101) on shaft (122).
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! CAUTION
When handling the impeller, wear heavy work gloves to
prevent cutting hands on sharp edges.
c. Secure impeller (101) firmly with impeller nut
(304).
NOTE: Impeller nut has LEFT HAND threads.
d. Mount dial indicator as shown in Fig. 37.
e. Rotate shaft (122) so indicator rides along the
casing side impeller wear ring (202) surface for
360 degrees.
f. Repeat steps d and e for seal chamber cover side
wear ring (203).
If impeller wear ring (203 and 203) runout is in excess of
0.13 mm (.005 in.):
a. Check for distortion at set screw areas.
b. Check shaft (122) runout and all mating surfaces
of shaft and impeller (101) hub for perpendicu-
larity.
c. True up all surfaces found damaged and recheck
impeller wear ring (202 and 203) runout.
3910-1
1th IOM 5/08
43
Fig. 36
Fig. 37
6