Figure 5: Move diffuser up and
down
Figure 6: Move diffuser up and
down
10. Proper location of the impellers on the shaft is obtained by the use of shims (331) between the drive
collar and the first stage impeller hub, and also between the hubs of the remaining impellers. Shins
are supplied in .010" and .030" thicknesses. Slide sufficient shims over the shaft and against the
drive collar until the top of the shim stack is flush with the straight edge across the casing adapter.
Remember that the shaft must be bottomed during this procedure.
11. Ensure back washers (546) are in place on all impellers.
12. Install the suction diffuser (151) on the casing adapter (108). Ensure suction diffuser (15l) and cas-
ing adapter (108) fits are clean and that the diffuser is free to turn in the casing.
13. Install the first stage impeller (201) on. shaft (122).
14. Push shaft and impeller down firmly until the splined end of the shaft bottoms in the stub shaft. In-
stall a dial indicator as shown in Fig. 7. With the shaft bottomed, move the diffuser up and down
squarely as shown in Fig. 8 and Fig. 9. The amount of up and down movement is read on the dial
indicator is the actual front clearance.
15. Actual front clearance must be equal to required front clearance shown in Table 4. If not, add or
remove shims between the drive collar and first stage impeller hub as required.
7.4 Reassembly of liquid end
16
3335 Installation, Operation and Maintenance Instructions
