Gorman-Rupp Pumps T8A71S-B /F,/FM - Manual (Page 30)

OM-05352 SUPER T 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 (25 and 26).
Inspect the back cover O‐rings (23 and 28) and re­
place it if damaged or worn.
Suction Check Valve Removal
(Figure 1)
If the check valve assembly (47) is to be serviced,
remove the check valve pin (3), reach through the
back cover opening and pull the complete assem­
bly from the suction flange (46).
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 (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 (28B) and drain the seal lubricant.
This will prevent the oil in the seal cavity from es­
caping 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 (24 and
25).
Install the shaft key (16). Install a lathe dog on the
drive end of the shaft (17) 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 (17 and 18) from the
casing ring (14). Install three of the inner cap­
screws 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
(14). Remove the outer hardware (15 and 16) and
shims (13), and separate the casing ring from the
pump casing. Tie and tag the shim sets for ease of
reassembly.
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