Gorman-Rupp Pumps 83B2-B 1063841 and up - Manual (Page 26)

OM−00868 80 SERIES
MAINTENANCE & REPAIR PAGE E − 5
Inspect the wear plate assembly and replace it if
badly scored or worn. To remove the wear plate as-
sembly, remove the capscrew (46) and fiber wash-
er (45) just below the suction port. Reach through
the suction port and disengage the hardware (59
and 60) from the wear plate stud. Tap the wear
plate assembly free of the casing.
Impeller Removal
Immobilize the impeller by wedging a block wood
between the vanes. Remove the hardware (39, 40
and 41) securing the impeller to the shaft. If re-
moved, install the shaft key (27). Install a lathe dog
on the drive end of the shaft (28) 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 (11)
off the impeller shaft. Tie and tag the shims, or
measure and record their thickness for ease of
reassembly.
Seal Removal
(Figures 1 and 3)
Make certain that the cross arm on the grease cup
has been turned down against the cover before re-
moving the seal assembly.
For ease of disassembly, the seal and seal plate
(36) may be removed as a single unit. Before at-
tempting to remove the seal plate, remove the seal
cavity grease cup and piping (12, 13 and 14).
Slide the seal plate and seal parts off the shaft as a
unit. Be careful not to drop or damage any seal
parts.
Carefully remove the stationary and rotating seal
elements, packing rings, seal spring, and spacer
sleeve from the seal plate. Use a stiff wire with a
hooked end if necessary.
Inspect the seal liner (15) for wear or grooves that
could cause leakage or damage to the seal pack-
ing rings. The seal liner is a press fit in the seal plate
(36) and does not normally require replacement. If
replacement is required, see Seal 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 (33) and drain the
pedestal. Clean and reinstall the plug.
Remove the slinger ring (16) from the shaft. Re-
move the pedestal mounting hardware from the
base. Tie and tag any shims used under the
mounting feet for leveling.