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Gorman-Rupp Pumps 83C3-B 814600 and up User Manual

Page 26

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OM−00884

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 (29) 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 (33) and replace it if badly

scored or worn. To remove the wear plate assem-

bly, remove the capscrew (37) and fiber washer

(38) just below the suction port. Reach through the

suction port and disengage the hardware (34 and

35) from the wear plate stud. Tap the wear plate as-

sembly free of the casing.

Impeller Removal

Immobilize the impeller by wedging a block wood

between the vanes. Remove the hardware (30, 31

and 32) securing the impeller to the shaft. If re-

moved, 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 (51)
off the impeller shaft. Tie and tag the shims, or
measure and record their thickness for ease of
reassembly.

Seal Removal

(Figures 1 or 3)

Remove the spring centering washer (50) and seal
spring.

Carefully slide shaft sleeve (51) and rotating por-
tion 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 (9) and stationary por-
tion of the seal off the shaft as a unit.

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.

If no further disassembly is required, see Seal
Reassembly and Installation.