Xylem AC8584C Series HSCS Base Mounted Centrifugal Pumps User Manual
Page 22
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15. Assemble bearing cover to bearing housing with two cap
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screws (3-904-9).
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16. Replace pump coupling half and key (3-911-2).
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17. Assemble rotating element in lower half casing (2-001-8).
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Correctly locate casing ring pins (3-943-9) in casing main
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joint slot.
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NOTE: Sliding inboar
d bearing housing toward coupling
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prior to assembling rotating element in casing will ease
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assembly.
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18. Bolt outboard bearing housing in place. Be sure that both
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housing are seated properly in lower half casing.
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19. Bolt inboard bearing housing in place.
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20. Clean the gasket surfaces of the casing. Apply Scotch
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3M-77 spray adhesive or equivalent to the lower half of the
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casing.
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21. Within one minute of spraying, set the gaskets
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(2-123-5, -6) in place on the lower half casing, align the
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holes in the gaskets with the holes in the casing and press
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the gaskets firmly against the lower half casing face in the
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area coated by the adhesive.
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22. Lower upper half casing (2-001-7) into place (See Figure
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16) and locate using the taper dowels (2-916-9) and install
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casing main joint bolts (2-904-9). The casing joint bolts
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should be tightened to the following torques: 300 ft-lb
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minimum for .75"-10 Ferry Cap Counterbore screws
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(Grade 8), 400 ft-lb minimum for 1.0"-8 Ferry Cap
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Counterbore screws (Grade 8). Bolt torquing pattern is
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shown in Figure 10. Before tightening bolts, be sure taper
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dowels are seated properly in reamed holes.
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NOTE: T
orque values are essential in obtaining proper
gasket compression so no leakage can occur at main joint.
23. Slide deflectors (3-136-9) toward bearing covers. Allow
rotating clearance of approximately (1/16").
24. Rotate shaft by hand to assure that it turns smoothly and
is free from rubbing and binding.
25. Cut full rings of 5/8 inch square packing so that ends butt,
leaving no gap between packing and casing. Install three
rings of packing (1-924-9) and tap fully to bottom of both
stuffing boxes. (See Figure 17) Stagger joints of each ring
of packing t least 90°. Install seal cage (1-013-2) and be
sure that it will line up with seal water inlet when packing is
compressed. Install remaining three rings of packing with
joints staggered. Assemble glands (1-014-2) square with
stuffing box and pull up tight. Then loosen gland bolts
(1-904-9) to permit packing to expand, and retighten finger
tight. Final adjustment of gland bolts must be done when
pump is running. Allow 30 minutes between adjustments.
(See Figure 18)
26. Assemble seal water lines (0-901-0, 0-950-0, 0-952-0) to
stuffing box and casing. Seal water lines go to inside
holes. (See Figure 12)
27. Check coupling alignment and redowel if necessary.
FIGURE 16 – LOWERING CASING COVER ONTO
LOWER HALF
CAUTION:
Double check r
otation of pump before
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installing the upper half casing. (Refer to figure 9)
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FIGURE 17 – INSER
TING PACKING INTO STUFFING BOX
FIGURE 18 – SECURING PACKING GLAND IN POSITION