Gorman-Rupp Pumps 11 1/2A52-B 1241127 and up - Manual (Page 26)

OM−00615 10 SERIES
MAINTENANCE & REPAIR PAGE E − 5
shaft key (19). Install a lathe dog on the drive end of
the shaft (20) 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 in a counterclockwise direc-
tion. Use caution when removing the impeller; ten-
sion on the seal spring will be released as the im-
peller is unscrewed.
Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (22)
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 spring retainer (21) and the seal
spring. Slide the shaft sleeve (23) and rotating por-
tion of the seal off the shaft as a single unit. Apply oil
to the sleeve and work it up under the bellows.
Slide the rotating portion of the seal off the sleeve.
Slide the seal plate (25) off the shaft and use a suit-
ably sized dowel to press the seal stationary ele-
ment and seat out of the seal plate from the back
side.
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 slinger ring (12) and shaft key (19).
Use snap ring pliers to remove the retaining ring
(17), and remove the bearing adjusting shims (18).
Tie and tag the shims or measure and record their
thickness for ease of reassembly.
NOTE
There are no provisions for draining the lubricant
from the pedestal. Place a drip pan under the ped-
estal before disassembly.
Place a block of wood against the impeller end of
the shaft and tap the shaft and assembled bear-
ings (14 and 16) from the pedestal. Be careful not
to damage the shaft.
It is not necessary to remove the inboard bearing
retaining ring (12) unless replacement is required.
Use snap ring pliers to remove the retaining ring.
After removing the shaft and bearings, clean and
inspect the bearings in place as follows.