Gorman-Rupp Pumps PA6C60-4045T-ESP 1450296 thru 1479000 - Manual (Page 43)

OM−06341 PA SERIES
MAINTENANCE & REPAIR PAGE E − 21
gine. Disconnect the discharge piping from the
pump casing.
Remove the hardware (8 and 9) securing the drive
flange (4) to the engine bellhousing. Separate the
assemblies by pulling the pump end straight away
from the engine.
As the assemblies separate, the flexible portion of
the coupling assembly (1) will remain on the shaft.
To remove the coupling from the shaft, unscrew the
two allen head setscrews from the bushing (2).
Screw one of the setscrews into the puller hole on
the circumference of the bushing. As the coupling
and bushing separate, remove the bushing, and
slide the coupling off the shaft. Remove the shaft
key (3).
It is not necessary to remove the outer ring of the
coupling from the engine flywheel unless the cou-
pling must be replaced. To remove the ring, disen-
gage the hardware (6 and 7) securing it to the fly-
wheel.
Move the pump end to a clean, well equipped shop
area for further disassembly.
Draining Oil From Seal Cavity
(Figure 7)
If any further disassembly is to be performed on the
pump, the seal oil cavity must be drained to pre-
vent the oil in the seal cavity from escaping as the
pump casing is removed.
Position a clean container (3 gallons [11,4 liters]
minimum capacity) under the seal cavity drain
plugs (10A, Figure 6 and 7B, Figure 7). Remove the
plug and drain the oil from the seal cavity into the
container. For shorter drain time, remove the
vented plugs (14, Figure 6 and 8, Figure 7). Clean
and reinstall the drain and vent plugs. Inspect the
oil for water, dirt or a cloudy condition which could
indicate seal failure.
Loosening Impeller
(Figure 7)
With the pump end separated from the engine,
wedge a block of wood between the vanes of the
impeller and the pump casing to prevent rotation.
Remove the impeller capscrew and washer (26
and 27).
Install the shaft key (22) in the shaft keyway. 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
11 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.
Turn
Counterclockwise
Lathe Dog Arm
V" Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 11. Loosening Impeller
NOTE
Do not remove the impeller until the rotating assem-
bly has been removed from the pump casing.
Pump Casing Removal
(Figure 6)
Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam-
age to equipment. If slings or chains are
used to move the pump or components,
make sure that the load is balanced;
otherwise serious personal injury or