Gorman-Rupp Pumps 83D20-B 733876 and up - Manual (Page 26)

OM-00889 80 SERIES
MAINTENANCE & REPAIR PAGE E - 5
Do not attempt to lift the complete pump
unit using the lifting eye. It is designed
to facilitate removal or installation of in­
dividual components only. Additional
weight may result in damage to the
pump or failure of the eye bolt.
Remove the gasket set (34) from the pedestal and
seal plate. Tie and tag the gaskets, or measure and
record their thickness for ease of reassembly. Tie
and tag any leveling shims used under the casing
mounting feet to ease reassembly.
Inspect the wear plate (36) and replace it if badly
scored or worn. To remove the wear plate assem­
bly, remove the capscrew (43) and fiber washer
(44) just below the suction port. Reach through the
suction port and disengage the hardware (40 and
41) from the wear plate stud. Tap the wear plate as­
sembly free of the casing.
Impeller Removal
Before attempting to remove the impeller, remove
the bottle oiler and piping (9, 10 and 11) from the oil
reservoir cap (30).
Immobilize the impeller by wedging a block wood
between the vanes. Remove the hardware (37, 38
and 39) securing the impeller to the shaft. If re­
moved, install the shaft key (22). Install a lathe dog
on the drive end of the shaft (24) 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 (57)
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)
Remove the seal spring.
Carefully slide the shaft sleeve (59) and rotating
portion of the seal off the shaft as a unit. Apply oil to
the sleeve and work it up under the rubber bellows.
Slide the rotating portion of the seal off the sleeve.
Carefully slide the seal plate (35) and stationary
portion of the seal off the shaft as a unit. Remove
the seal housing gasket (33).
Position the seal plate on a flat surface with the im­
peller side down. Use a suitably sized dowel to
press the stationary seat and O‐ring out of the seal
plate from the back side.
Pry the oil seal (32) out of the seal housing.
Slide the oil reservoir cap (30) and oil seal (12) off
the shaft as a unit. Press the oil seal from the bore
of the reservoir cap.