Goulds Pumps XHD - IOM - Manual (Page 71)

Maintenance
• Sockets
• Soft face hammer
• Spanner wrench
• Torque wrench
• Wrenches
Typical disassembly
The XHD slurry pump is available in two models: the basic version, referred to as XHD and the
XHD Value Option. The method of disassembly and assembly can vary between these models.
The XHD is a front pull out design. Typical disassembly steps can be followed for both the XHD
and XHD Value Option.
The suction half casing and attached components can be removed for further disassembly and
replacement of the suction side liner (562) and adjustable seal ring (822, XHD only) as
necessary. After removing the impeller (101) by disengaging the knock-off ring (149), the gland
half casing (100D) can remain mounted to the pedestal (131) and the casing volute liner (561)
removed for replacement. Other components such as the gland, packing, seal cover etc. can
also be removed in a methodical fashion as needed for inspection and replacement. In addition
to traditional sequential disassembly methods, the entire wet end can be completely removed
from the pedestal and bearing frame on the XHD model, as outlined in the following section:
XHD Complete Wet End Disconnection.
Complete wet end disconnection - XHD only
The XHD model features a "quick disconnect" wet end option. Removal of the entire wet end
from the bearing frame and pedestal can be performed as follows:
1. Loosen the two forward adjusting nuts rod nuts (415A) on both sides of the power frame by
turning them clockwise.
2. Loosen the hold-down bolts (352G) 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.
3. Turn the two rearward adjusting nuts (415A) on both sides of the power frame sequentially
clockwise, 1/3 turn of each nut at a time, to draw the bearing frame and impeller (101)
toward the casing volute liner (561). Stop when the impeller is firmly seated against the
volute liner.
4. Loosen the three adjustable seal ring jam nuts (357A) by turning them clockwise.
5. Turn the seal ring square head adjusting bolts (356F) sequentially, counterclockwise 1/3 of
a turn at a time, to move the adjustable seal ring forward in the casing until it is firmly
seated against the impeller.
6. Lock the seal ring adjusting bolts (356F) in place by re-tightening the jam nuts (357A)
against the suction half casing (100A).
7. Turn the shaft (122) counterclockwise to disengage the shaft threads from the impeller.
This will cause the bearing frame to move rearward on the pedestal until the shaft
disengages from the impeller (101) held captive in the casing by the adjustable seal ring.
NOTE: This should take 4 - 5 complete shaft turns.
8. Attach hoist hook to the gland half casing (100D) lifting lug and tension to support.
Do not over-tension the hoist. Over-tensioning and lifting up on the wet end assembly with
the hoist could cause shaft and bearing frame component damage.
9. Remove the tapered alignment stud hex nuts (427L) that attach the gland half casing
(100D) to the pedestal (131).
10. Remove the hex head cap screws (370Y) that attach the gland half casing (100D) to the
pedestal (131).
11. Remove the entire wet end from the pedestal and power end. The wet end will need to be
moved forward horizontally enough to clear the end of the shaft before the wet end is lifted
or lowered using the hoist. While moving the wet end forward, keep the entire assembly
level and concentric with the shaft.
XHD Installation, Operation, and Maintenance Manual 69