Gorman-Rupp Pumps 82H52-B 252751 thru 1325647 - Manual (Page 24)

OM−00836 80 SERIES
MAINTENANCE & REPAIR PAGE E − 5
Pump Casing Removal
To service the impeller (2), wear plate assembly
(29) and seal assembly (3), disconnect the dis-
charge piping. Remove the hardware securing the
pump casing (1) to the base.
Remove the nuts (26) securing the pump casing
and gasket set (28) to the pedestal (10) and seal
plate (27). Install a standard 5/8−11 UNC lifting
eye in the tapped hole in the top of the pump cas-
ing. Be sure to screw the eye into the casing until
fully engaged. Use a hoist and sling of suitable ca-
pacity to separate the casing from the seal plate
and pedestal.
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 (28) 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 assembly (29) and replace it
if badly scored or worn. To remove the wear plate
assembly, remove the capscrew (36) and fiber
washer (37) just below the suction port. Reach
through the suction port and disengage the hard-
ware (33 and 34) 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 (30, 31
and 32) securing the impeller to the shaft. If re-
moved, install the shaft key (15). Install a lathe dog
on the drive end of the shaft (16) 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 (5)
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 spring seat (4) and seal spring.
Carefully slide the shaft sleeve (6) and rotating por-
tion of the seal off the shaft (16) as a unit. Apply oil
to the sleeve and work it up under the rubber bel-
lows. Slide the rotating portion of the seal off the
sleeve.
Carefully slide the seal plate (26) and stationary
portion of the seal off the shaft (20) as a unit.
Position the seal plate on a flat surface with the im-
peller side down. Use a suitably sized dowel to