Goulds Pumps 3298 - IOM - Manual (Page 81)

Maintenance
• Tighten the screw only enough to turn the impeller without it slipping.
• The allowed front shroud TIR is 0.060 in. (0.152 cm)
• For the XS impeller, trim both the front and back shrouds and the vanes to a minimum
diameter of 3.75 in. (9.53 cm).
• When you trim between 3.00 in. (7.62 cm) and 3.75 in. (9.53 cm), trim only the front shroud
and the vanes.
Trimming examples
1. Impeller
2. Steel washer with rubber bond
3. Paper gasket
4. Arbor
Figure 73: XS group
1. Steel washer with rubber bond
2. Socket head capscrew
3. Impeller
4. Paper gasket
5. Arbor
Figure 74: S and M groups
3298 Family Installation, Operation, and Maintenance Manual 79