Gorman-Rupp Pumps U6A60S-B 1289665 and up - Manual (Page 30)

OM-05668 SUPER U SERIES
MAINTENANCE & REPAIR PAGE E - 7
Inspect the wear plate, and replace it if badly
scored or worn. To remove the wear plate, disen­
gage the hardware (30 and 31).
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 (27) 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 (31 and
32).
Install the shaft key (19). Install a lathe dog on the
drive end of the shaft (23) 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 (14 and 15) from the
pump ring (11). Install three of the inner capscrews
in the jacking holes in the casing 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 casing ring.
Remove the outer hardware (12 and 13) and shims
(10), and separate the casing 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
factory. If the tool is used, follow the instructions
packed with it. If improvised tools are used, be sure
they are heavy enough for safe use and will not
damage the pump.
After the rotating assembly is loosened, screw a
5/8-18 UNF X 16‐inch long threaded rod into the
impeller shaft. Support the drive end with another
set of handles, or a length of pipe (1-13/16 inch
[46 mm] minimum I.D.), and slide the complete ro­
tating assembly through the back cover opening
(see Figure 4). Move the rotating assembly to a
clean work area before proceeding with disassem­
bly.