Gorman-Rupp Pumps T6A3-B /F,/FM - Manual (Page 30)

OM-01046 T SERIES
MAINTENANCE & REPAIR PAGE E - 7
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 (25) 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 (22 and
23).
Install a lathe dog on the drive end of the shaft (17)
with the “V” notch positioned over the shaft key­
way.
Turn
Counterclockwise
Lathe Dog Arm
“V” Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 3. Loosening Impeller
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 and wood block.
NOTE
Do not remove the impeller until the rotating assem­
bly has been removed from the pump casing.
(Figure 1)
Remove the hardware (9 and 10) securing the ro­
tating assembly to the pump casing. 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.
TEE
APPROX. 6 IN.
(152 MM) LONG
APPROX. 14 IN.
(356 MM) LONG
Figure 4. Rotating Assembly Tool
To install the tool, remove the air vent (9, Figure 2)
from the bearing housing, and screw the longest
length of pipe into the vent hole until fully engaged.
Install the tee, and screw the handles into the tee.
Use caution when lifting the rotating assembly to
avoid injury to personnel or damage to the assem­
bly.
Remove the bearing housing O‐ring (8).
Impeller Removal
(Figure 2)
With the rotating assembly removed from the
pump casing, unscrew the impeller from the shaft.