Gorman-Rupp Pumps 83B31-B 1364724 and up - Manual (Page 26)

OM−06007 80 SERIES
MAINTENANCE & REPAIR PAGE E − 5
charge piping. Remove the hardware securing the
pump casing (1) to the base.
Remove the nuts (33) securing the pump casing
and gasket set (35) to the pedestal (18) and seal
plate (34). 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 (35) 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 and replace it if
badly scored or worn. To remove the wear plate as-
sembly, remove the capscrew (44) and fiber wash-
er (43) just below the suction port. Reach through
the suction port and disengage the hardware (57
and 58) 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 (37, 38
and 39) securing the impeller to the shaft. If re-
moved, install the shaft key (25). Install a lathe dog
on the drive end of the shaft (26) 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 (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)
Remove the spring seat (12) and seal spring. Care-
fully slide the seal plate (34), shaft sleeve (13), and
seal off the shaft (26) as a unit.
Remove the shaft sleeve and rotating portion of the
seal from the seal plate. Apply oil to the sleeve and
work it up under the rubber bellows. Slide the rotat-
ing portion of the seal off the sleeve.
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.