SVCN 7 INSTALLATION, OPERATION, & MAINTENANCE
12. Slide the inboard fan (2744) onto the shaft (1). Position the inboard fan approximately 0.06
in. (1.5 mm) from the bearing housing and tighten the lock screw.
13. Determine shaft and impeller wear ring runout as follows:
a. With bearing housing clamped in position, fix dial indicator to bearing housing (2998)
and touch dial indicator button to shaft (1). Indicator must be fixed tightly to housing.
b. Slowly, rotate shaft and record readings at 12, 3, 6, and 9 o'clock points. Total indicated
reading (TIR) shall not exceed 0.0015 in (0.04 mm). If readings are excessive, set up may
not be rigid.
If runout is excessive, disassemble the bearing housing assembly and check all parts for
burrs, dirt and rough surfaces. Check the register face of the bearing housing for
squareness, and its bore for roundness. Ensure that the bearings are bottomed against
their shaft shoulders.
c. If you disassemble the bearing housing assembly, reassemble it in accordance with the
procedure outlined above.
d. Remove the dial indicator.
e. Install the impeller key (2966A), seal spacer sleeve (599) or shaft sleeve, and impeller
(34).
NOTE
The impeller nut (238) or inducer (3186) has left-handed
threads.
f. Install impeller lock washer (3151), then install and tighten lock nut (238) or inducer
(3186), but do not bend an ear on the lock washer. The impeller must be tight against the
shaft shoulder with no play.
g. Fix dial indicator to bearing housing register face or another point so that it is rigid and
touch indicator button to either wear ring (200A/B).
h. Slowly, rotate shaft and record readings at 12, 3, 6, and 9 o'clock points; TIR shall not
exceed 0.0015 in (0.04 mm).
i. Repeat steps f and g to verify concentricity of other wear ring.
j. If runout is excessive, check fit of impeller on shaft (see paragraph 4.4.4, “Checking Fit
Between Impeller Bore and Shaft”, on page 4-6) and impeller wear ring installation (see
paragraph 4.4.7, “Replacing Impeller Wear Rings”, on page 4-8).
Should you be unable to determine the cause of excessive runout, contact the nearest
Flowserve Service Office.
k. Remove the impeller lock nut (238) or inducer (3186), lock washer (3151), impeller (34),
impeller key (2966A), and seal spacer sleeve (599) or shaft sleeve.
14. Install a new seal gland gasket (2988B) in the face of the head (85). Install the mechanical
seal cartridge (3213A), mechanical seal gland plate and shaft sleeve, or packing box and shaft
sleeve on the head (85), ensuring correct orientation of the gland taps (refer to the Seal Piping
drawing in the back of this manual). Install and tighten the gland seal nuts (2666B).
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DO2604-13
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