Goulds Pumps XHD - IOM - Manual (Page 82)

Maintenance
2. Remove the impeller hub o-ring (412A) and shaft sleeve o-ring (412F).
Remove the power end - quick disconnect option for XHD
The XHD power end can be removed when the entire liquid end is still attached to the pedestal
by employing the components available with the XHD complete liquid end disconnect feature.
Rather than removing any portion of the wet end, it can remain assembled to the pedestal and
the power end can be removed as follows:
This procedure can also be employed to change out the entire wet end while not removing the
power end.
1. Loosen the forward (wet end side) bearing frame adjusting nuts (415A) by turning them
clockwise.
2. 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.
3. Move the impeller to the back of the volute liner: Turn the two rearward (drive end side)
bearing frame adjusting nuts (415A) on either side of the power frame sequentially
clockwise, 1/2 turn of each nut at a time, to draw the bearing frame and impeller (101)
backwards toward the 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. Move the suction seal ring towards the impeller: 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, thereby pinching
the impeller between the seal ring and the volute liner.
6. Lock the seal ring adjusting bolts (356F) in place by re-tightening the jam nuts (357A)
against the suction half casing (100A).
7. Loosen the knock off ring bolts and disassemble the knockoff ring halves(149) from the
shaft.
8. Turn the shaft (122) counterclockwise with a strap wrench or shaft wrench 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) which is held captive in the
casing by the adjustable seal ring and casing volute liner. NOTE: This should take 4 to 5
complete shaft turns.
9. Slide the bearing frame backwards away from the liquid end until the shaft is completely
free of the liquid end.
10. Insert hoist hook through the bearing cartridge housing (228) lifting lug.
11. Remove the bearing frame adjustment plate bolts (352G) and threaded adjustment rod
nuts on the outer face of the adjustment plate (234F) ears.
12. Remove and set aside the bearing frame adjustment plates (234F).
13. Tension the hoist fully to lift and move the bearing frame to designated work area.
Remove the power end- XHD and XHD Value Option
Before beginning removal of the power end, check to ensure that the pedestal (131) is securely
fastened to the foundation, baseplate or work surface, such as a workbench.
80 XHD Installation, Operation, and Maintenance Manual