6.4.5 Complete wet end connection - XHD
The XHD model features a "quick connect" wet end option. If you have received a complete replace-
ment wet end from the factory or your distributor, installation of the entire wet end to the pedestal and
bearing frame can be performed as follows:
NOTICE:
The quick connect wet end assembly procedure cannot be used if the assembly does not have
the Suction seal ring option installed. This quick disconnect feature may also be unavailable
depending on the amount of wear on the suction seal ring and internal surfaces.
The quick connect wet end method uses the Adjustable Suction seal ring to clamp into the im-
peller and hold it in place during the assembly.
1.
Coat the shaft (122) protuberance, including the threads, with an anti-seizing compound.
2.
Loosen but do not remove the hex head screws holding the knock-off ring (149) halves together.
3.
Position the knock-off ring onto the shaft (122). Make sure that the part is properly oriented. The
larger diameter step of the knock-off ring should face the bearing cartridge housing (228).
4.
Slide the knock-off ring towards the bearing cartridge housing until it is flush with the inboard end
cover (160). The knock-off ring fits over the inboard Inpro seal (332A).
5.
Tighten the knock-off ring hex cap screws to secure.
6.
Prepare the shaft sleeve (126) by coating the sleeve o-ring (412F) and impeller hub o-ring (412A)
with a lubricant and install into the inner diameter and impeller end o-ring grooves.
7.
Slide the shaft sleeve with the impeller hub o-ring properly positioned (facing outward) onto the
shaft. Use care when positioning the sleeve on the shaft to avoid ID o-ring damage.
8.
Continue sliding the sleeve until it is fully seated in the knock-off ring. Use a soft blow mallet to gen-
tly tap the sleeve along the shaft if necessary.
9.
Insert the tapered alignment studs (375B) into the rear of the gland half casing (100D) using a met-
ric stud driver.
10. Attach the hoist hook to the gland half casing (100D) lifting lug and tension to support the wet end.
11. Lift the wet end into position against the pedestal (131). Guide the installed tapered alignment studs
through the pedestal holes on the sides of the bearing frame.
12. Attach the wet end to the pedestal by installing and fully tightening the alignment stud hex nuts
(427L).
13. Fully secure the wet end to the pedestal by installing the hex head capscrews (370Y) through the
holes in the pedestal's lower front ring into the gland half casing (100D).
14. Loosen the bearing adjustment frame threaded rod nuts (415A) on the forward (wet end) side of the
adjustment plates by turning them clockwise.
15. Loosen the hold-down bolts (352G) and nuts (427D) that clamp the adjustment plates (234F) to the
bearing cartridge housing (228) but do NOT remove. Bolts should remain finger-tightened to keep
the bearing frame constrained to the pedestal while allowing it to slide along the pedestal rails.
16. Slide the bearing frame forward until the shaft (122) threads are inside the wet end and engaged
with the impeller (101).
17. Turn the shaft (122) clockwise to re-engage the shaft threads to the impeller. This will cause the
bearing frame to move forward on the pedestal until the shaft is fully threaded to the impeller. Note:
This will take 4 - 5 complete shaft turns.
18. Loosen the three adjustable seal ring jam nuts (357A) by turning them clockwise.
19. Turn the seal ring square head adjusting bolts (356F) sequentially, clockwise 1/3 of a turn at a time,
to move the adjustable seal ring backward in the casing until it is firmly seated against the suction
side liner (562).
20. Adjust the impeller gap (refer to the Maintenance section for instructions).
21. Fully tighten the hold-down bolts (352G) and nute (427D) that clamp the adjustment plates (234F)
to the bearing cartridge housing (228).
22. Tighten the bearing adjustment frame threaded rod nuts (415A) on the forward (wet end) side of the
adjustment plates by turning them counterclockwise.
23. Adjust the seal ring gap (refer to the Maintenance section for instructions).
6.4 Reassembly
118
XHD Installation, Operation, and Maintenance Manual
Summary of Contents for XHD
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