Gorman-Rupp Pumps 16A20-B 818301 and up - Manual (Page 28)

OM‐00710 10 SERIES
MAINTENANCE & REPAIR PAGE E - 5
Back Cover Removal
The wear plate (73) is easily accessible and may be
serviced by removing the back cover assembly
(66). Loosen the clamp bar screw (71) and remove
the clamp bar (72). Pull the back cover and wear
plate from the pump casing. Remove the back cov­
er gasket (65). Clean the mating surfaces of the
back cover plate and pump casing.
Inspect the wear plate and replace it if badly scored
or worn. To remove the wear plate, disengage the
hardware (63 and 64) securing it to the back cover.
If no further disassembly is required, see Back
Cover Installation.
Pump Casing Removal
To service the impeller or seal assembly, discon­
nect the discharge piping. Remove the hardware
securing the pump to the base and disconnect the
power source. Tie and tag any leveling shims used
under the mounting feet to ease reassembly.
Remove the nuts (57) and separate the pump cas­
ing and gasket set (59) from the seal plate (58) and
pedestal (37). Clean the mating surfaces of the
seal plate and pump casing. Tie and tag the gas­
kets or measure and record their thickness for
ease of reassembly.
Impeller Removal
Before removing the impeller, remove the bottle
oiler and piping (30, 31, 32 and 33). Remove the
seal drain plug (55) and drain the oil from the seal
cavity to prevent the oil from escaping when the im­
peller is removed. Clean and reinstall the drain
plug.
Immobilize the impeller by wedging a block wood
between the vanes. If removed, install the shaft key
(42). Install a lathe dog on the drive end of the shaft
(43) with the “V” notch positioned over the shaft
keyway. Remove the impeller capscrew and wash­
er (60 and 61).
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.
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 (22)
off the impeller shaft. Tie and tag the shims or mea­
sure and record their thickness for ease of reas­
sembly.
Seal Removal and Disassembly
Remove the spring centering washer and seal
spring. Slide the shaft sleeve (21) and rotating por­
tion of the seal off the shaft as a single unit. Apply oil
to the sleeve and work it up under the bellows.
Slide the rotating portion of the seal off the sleeve.
Slide the seal plate and stationary portion of the
seal assembly off the shaft as a single unit. Place
the seal plate on a flat surface with the impeller side
down. Use a suitably sized dowel to press the sta­
tionary seal components from the seal plate. Press
the oil seal (53) from the seal plate.
If no further disassembly is required, see Seal
Reassembly and Installation.