Gorman-Rupp Pumps 12B22-B 1059806 thru 1343819 - Manual (Page 25)

OM--00589--03 10 SERIES
MAINTENANCE & REPAIR PAGE E -- 5
kets, or measure and record their thickness for
ease of reassembly.
Impeller Removal
Before removing the impeller, remove the bottle oil-
er and piping (9, 10, 11 and 12). Remove the seal
drain plug (32) and drain the oil from the seal cavity
to prevent the oil from escaping when the impeller
is removed. Clean and reinstall the drain plug.
Immobilize the impeller by wedging a block wood
between the vanes. If removed, install the shaft key
(20). Install a lathe dog on the drive end of the shaft
(21) with the “V” notch positioned over the shaft
keyway.
With the impeller rotation still blocked, strike the
lathe dog sharply in a counterclockwise direction
(when facing the drive end of the shaft). The impel-
ler may also be loosened by using a long piece of
heavy bar stock to pry against the arm of the lathe
dog in a counterclockwise direction (when facing
the drive end of the shaft) as shown in Figure 2.
Use caution not to damage the shaft or keyway.
When the impeller breaks loose, remove the lathe
dog and wood block and unscrew the impeller
from the shaft.
Turn
Counterclockwise
Lathe Dog Arm
“V” Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 2. Loosening Impeller
Unscrew the impeller from the shaft. Use caution
when removing the impeller; tension on the seal
spring will be released as the impeller is un-
screwed.
Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (62)
off the impeller shaft. Tie and tag the shims or mea-
sure and record their thickness for ease of reas-
sembly.
Seal Removal and Disassembly
Remove the seal spring. Slide the shaft sleeve (58)
and rotating portion of the seal off the shaft as a
single unit. Apply oil to the sleeve and work it up un-
der the bellows. Slide the rotating portion of the
seal off the shaft. Use a stiff wire with a hooked end
to remove the stationary element, seat and O-rings
from the seal plate. Slide the seal plate (35) and oil
seal (31) off the shaft.
NOTE
An alternate method of removing the seal assembly
is to slide the seal plate and seal assembly off the
shaft as a single unit. Place the seal plate on a flat
surface with the impeller side down. Use a suitable
sized dowel to press the seal components and oil
seal from the seal plate bore.
Inspect the seal plate and replace it if cracked or
badly worn.
If no further disassembly is required, see Seal
Reassembly and Installation.
Shaft and Bearing Removal and Disassembly
When the pump is properly operated and main-
tained, the pedestal should not require disassem-
bly. Disassemble the shaft and bearings
only
when there is evidence of wear or damage.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly-
equipped shop by qualified personnel.
Remove the pedestal drain plug (28) and drain the
bearing lubricant. Clean and reinstall the drain
plug.
Remove the slinger ring (30).