Xylem IM158 R04 Model SMVT - Manual (Page 28)

26 SMVT Installation, Operation and Maintenance Manual
11. Install the (4) hex cap screws on the seal gland to the seal housing. See the “Engineering
Data” section on page 8 of this manual for the proper torque value.
12. Take care to make sure that the pump and motor shafts are clean; they should be free
of all burrs, oil, and grease. Both the pump and motor shafts should be completely dry
before moving on to the next step.
13. Install the dowel pin on the pump shaft and loosely assemble the shaft coupling. Do
not tighten the coupling at this point; it should be left loose enough to set the running
position in the next step.
14. Insert the impeller shim (supplied with the pump) between the shaft coupling and seal
gland. This will lift the shaft/impellers to the running position.
15. Very lightly tighten the (2) socket head cap screws on the pump end of the coupling (refer
to Figure 19). Tighten the coupling evenly; ensure that the coupling is symmetrical on
both the pump and motor shafts. Do NOT torque the cap screws in this step.
Figure 19: Coupling Socket Head Screws
16. Very lightly tighten the remaining (4) socket head screws on the coupling. Tighten the
coupling evenly; ensure that the coupling is symmetrical on both the pump and motor
shafts. Do NOT torque the cap screws in this step.
17. Torque the socket head cap screws on the coupling. Refer to Figure 20 for the proper
torque pattern. See the “Engineering Data” section on page 8 of this manual for the
proper torque value.
Figure 20: Coupling Torque Pattern Figure 20a: Run Out Measurement Location
18. Remove the impeller position shim. Retain for later use.
19. Visually inspect the gaps between the coupling to ensure they are symmetrical on both
sides and consistent throughout the length of the coupling.
20. Inspect run out of the shaft between the bottom of the coupling and the mechanical seal
as shown in Figure 20a. If the run out exceeded 0.005”, the coupling must be adjusted.
It is usually most effective to adjust the four bolt section of the coupling.
Maintenance (continued)