Goulds Pumps 3700 Installation, Operation And Maintenance Manual page 85

b) Correct any distortion in excess of 0.003 in. (0.08 mm) by machining before you trim the
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Figure 60: Casing wear ring
7. Measure the bore of the casing wear ring to establish the required impeller wear-ring
diameter you use to provide the recommended running clearances.
8. Repeat steps 6 and 7 for the seal-chamber wear ring.
9. Turn the impeller wear rings to size after you mount them on the impeller:
NOTICE:
Figure 61: Impeller
10. Install the impeller:
a) Install the impeller key on the shaft of the assembled bearing frame from which the
b) Install the impeller on the shaft.
c) Install the impeller washer.
d) Secure the impeller firmly with an impeller screw or impeller nut.
11. Check the impeller wear-ring runout:
a) Mount the dial indicator.
b) Rotate the shaft so that the indicator rides along the casing-side impeller wear-ring
Model 3700, API Type OH2 / ISO 13709 1st and 2nd Ed. / API 610 8/9/10/11th Ed. Installation, Operation, and Maintenance
Manual
new impeller wear rings.
Casing
Casing wear ring
• All replacement impeller wear rings, except those that are hard-faced, are supplied
0.020 in. to 0.030 in. (0.51 mm to 0.75 mm) oversize.
• Do not machine all wear rings. Spare hard-faced impeller wear rings are supplied to
pre-established clearances when both impeller and casing wear rings are renewed.
seal-chamber cover has been removed, and on which the runouts are within the
established specifications. The key should be at the top (12 o'clock) position for the
impeller installation.
The impeller screw has left-hand threads.
surface for 360°.
Maintenance
83