OM-05670
SUPER U SERIES
MAINTENANCE & REPAIR
PAGE E - 7
Remove the back cover nuts (27) 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 (27) and two diagonally opposing locking col
lars (28). Install two 1/2-13 UNC-2B 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 back cover O‐rings (23 and 24) and re
place if damaged or worn.
Inspect the wear plate, and replace it if badly
scored or worn. To remove the wear plate, disen
gage the hardware (21 and 22).
Suction Check Valve Removal
(Figure 1)
If the check valve assembly (30) is to be serviced,
remove the check valve pin (31), reach through the
back cover opening and pull the complete assem
bly from the suction flange (16).
NOTE
Further disassembly of the check valve is not re
quired since it must be replaced as a complete unit.
Individual parts are not sold separately.
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 (6) 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 (21) 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, and re
move the impeller capscrew and washer (7 and 8).
Install the shaft key (18). Install a lathe dog on the
drive end of the shaft (2) with the “V” notch posi
tioned 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)
Remove the inner hardware (5 and 7) from the
pump casing ring (3). Install three of the inner cap
screws in the jacking holes in the volute ring, and
use them to press the rotating assembly into the
pump casing until the bearing housing is free.
Remove the jacking screws from the volute ring.
Remove the outer hardware (5 and 6) and shims
(39), and separate the volute ring from the pump
casing. Tie and tag the shim sets for ease of reas
sembly.
An optional disassembly tool for removing and in
stalling the rotating assembly is available from the
