SVCN 7 INSTALLATION, OPERATION, & MAINTENANCE
15. Carefully lift the bearing housing assembly to a vertical position with the impeller end down.
Lower the end of the shaft through the shaft sleeve until bearing housing (2998) rests on the
head (85). Ensure that the shaft sleeve is retained in place on the shaft.
16. Install and tighten the bearing-housing-to-head cap screws.
17. If your pump is equipped with cartridge-type mechanical seals, tighten the set screws which
secure the shaft sleeve to the shaft (1), then rotate (or slide) the mechanical seal setting plates
out of their groove on the shaft sleeve and secure them in place.
18. Install the seal spacer sleeve (599) (if installed), impeller key (2966A), and impeller (34).
NOTE
The impeller nut (238) or inducer (3186) has left-handed
threads.
19. Install the impeller lock washer (3151), then install and tighten the impeller nut (238) or
inducer (3186) and bend a lock washer tab to secure the nut.
20. Using a dry heat convection oven or an induction heater, heat the pump half-coupling to
about 300°F (149°C). Install the coupling key (2966B) and the pump half-coupling on the
shaft (1).
21. Transport the head-rotor to the case or to storage, as required.
4.5.2 HEAD-ROTOR INSTALLATION
1. Install a new head gasket (2988A) on head (85).
NOTE
Use care when installing the head-rotor to avoid damage to
the head gasket (2988A).
2. Carefully lift the head-rotor and slide it into place in the case (37).
3. Install and tighten the head nuts (2666A). Torque nuts evenly in a star pattern to the torque
value listed below
NOTE
Values are based on slight lubrication of threads with
Neolube (graphite in isopropanol) or equivalent.
Table 4-2 Torque Values
Stud Size
ft-lb
Nm
5/8 in.
120
163
3/4 in.
220
298
7/8 in.
340
461
1 in.
520
705
DO2604-13
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