Gorman-Rupp Pumps 82H52-B 1325648 and up - Manual (Page 25)

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). Tie and tag the gas-
kets, or measure and record their thickness for
ease of reassembly. Tie and tag any leveling shims
used under the casing mounting feet to ease reas-
sembly.
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, use 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 im-
peller 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 (27) and stationary
portion of the seal off the shaft (16) 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.