OM-05815
ULTRA V SERIES
MAINTENANCE & REPAIR
PAGE E - 7
Back Cover And Wear Plate Removal
(Figure 1)
The wear plate (7) is easily accessible and may be
serviced by removing the back cover assembly
(12). Before attempting to service the pump, re
move the pump casing drain plug (6) and drain the
pump. Clean and reinstall the drain plug.
Remove the back cover nuts (17) and pry the back
cover and assembled wear plate from the pump
casing (1).
NOTE
An alternate method of removing the back cover
from the pump casing is to remove the back cover
nuts (17) and two diagonally opposing locking col
lars (13). Install two 1/2-13 UNC x 2 inch long
screws in the tapped holes in the back cover and
use them to press the back cover out of the pump
casing.
Inspect the wear plate, and replace it if badly
scored or worn. To remove the wear plate, disen
gage the hardware (9 and 10).
Inspect the back cover O‐rings (8 and 11) and re
place it if damaged or worn.
Rotating Assembly Removal
(Figure 2)
The rotating assembly may be serviced without
disconnecting the suction or discharge piping;
however, the power source must be removed to
provide clearance.
The impeller (1) should be loosened while the rotat
ing assembly is still secured to the pump casing.
Before loosening the impeller, remove the seal cav
ity drain plug and drain the seal lubricant. This will
prevent the oil in the seal cavity from escaping
when the impeller is loosened. Clean and reinstall
the seal cavity drain plug.
Immobilize the impeller by wedging a block wood
between the vanes and the pump casing. Remove
the impeller capscrew and washer (26 and 27).
If removed, install the shaft key (22). Install a lathe
dog on the drive end of the shaft (23) with the “V”
notch positioned over the shaft key.
With the impeller rotation still blocked, see Figure 3
and use a long piece of heavy bar stock to pry
against the arm of the lathe dog in a counterclock
wise direction (when facing the drive end of the
shaft).
Use caution
not to damage the shaft or key
way. When the impeller breaks loose, remove the
lathe dog, key and wood block.
NOTE
Do not remove the impeller until the rotating assem
bly has been removed from the pump casing.
Turn
Counterclockwise
Lathe Dog Arm
“V” Notch
Shaft Key
Impeller
Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 3. Loosening Impeller
(Figure 1)
Disengage the hardware (14 and 34) securing the
rotating assembly to the pump casing and remove
the spacers (35). Separate the rotating assembly
by pulling straight away from the pump casing.
NOTE
An optional disassembly tool is available from the
factory. If the tool is used, follow the instructions
packed with it. A similar tool may be assembled us
ing 1/2‐inch pipe (schedule 80 steel or malleable
iron) and a standard tee (see Figure 4). All threads
are 1/2‐inch NPT.
Do not pre‐assemble the tool.
