Disassembly of Rotating Element:
1. Remove the pump half coupling.
2. Detach bearing cover ( Part no. 35-inner & outer ) and separate
covers from the bearing housings.
3. Remove bearing housings inboard DE( Part no. 31).
4. remove bearing nut ( Part no.20&20 A) in AD & AB pumps
5. Remove packing ( Part no.13), lantern ring( Part no. 29), and stuffing
box bush (p.no. 63 if applicable) the number of packing rings on either
side of the lantern ring. For repair and removal of mechanical seals.
6. Loosen setscrews in sleeve nut ( Part no.20&20A) and unscrew the nut
from the shaft( Part no.6).
7. Remove o-ring ( Part no.130&130.1) with shaft sleeves( Part no.14)
8. Remove casing wear rings( Part no. 7&7A).
9. Disassembling rotating element.
10. Impeller (Part no.2&2A) with impeller rings can now be removed from
either end of the shaft.
When removing the impeller, note the direction of
the vanes. The impeller must be installed with the vanes in the same
direction.
Remove Impeller Rings:
It is not necessary to remove the impeller from the shaft to replace the impeller
rings. First remove the rotating element. Remove the locking set screws from the
rings
.
Inspection:
Visually inspect parts for damage affecting serviceability. Check o-rings and
gaskets for cracks, nicks, or tears; packing rings for excessive compression,
fraying or shredding, and embedded particles. Replace if defective in any way.
Mount the shaft between lathe centers and check eccentricity throughout the
entire length. Eccentricity should not exceed .002 inches (0.05mm). Bearing
surfaces should be smooth and shoulders
square and free of nicks. Measure OD of impeller hub or impeller wear rings and
ID of casing wear ring. Compute diametral clearance (ID minus OD) and compare
with clearance given under the
Pump Specifications
.
Surfaces must be smooth and concentric. Examine impeller passages for cracks,
dents or embedded material. Examine shaft sleeves for wear
.
