Gorman-Rupp Pumps U6B65S-B 1289655 and up - Manual (Page 31)

OM-05670 SUPER U SERIES
MAINTENANCE & REPAIR PAGE E - 8
An optional disassembly tool for removing and in­
stalling the rotating assembly is available from the
factory. If the tool is used, follow the instructions
packed with it. If improvised tools are used, be sure
they are heavy enough for safe use and will not
damage the pump.
After the rotating assembly is loosened, screw a
5/8-18 UNF X 16‐inch long threaded rod into the
impeller shaft. Support the drive end with another
set of handles, or a length of pipe (1-13/16 inch
[46 mm] minimum I.D.), and slide the complete ro­
tating assembly through the back cover opening
(see Figure 4). Move the rotating assembly to a
clean work area before proceeding with disassem­
bly.
ADD PIPE
AS REQUIRED
Figure 4. Rotating Assembly Removal
Remove the seal plate and bearing housing O‐
rings (25 and 27).
Impeller Removal
(Figure 2)
With the rotating assembly removed from the
pump casing, unscrew the impeller from the shaft.
Use caution when unscrewing the impeller; ten­
sion on the shaft seal spring will be released as the
impeller is removed. Inspect the impeller and re­
place if cracked or badly worn.
Remove the impeller adjusting shims (8); tie and
tag the shims, or measure and record their thick­
ness for ease of reassembly.
Seal Removal and Disassembly
(Figure 2)
Remove the seal spring. Apply oil to the shaft adja­
cent to the seal and work it up under the bellows.
Slide the rotating portion of the seal off the shaft.
Use a stiff wire with a hooked end to remove the
stationary portion of the seal.
An alternate method of removing the stationary
portion of the seal is to remove the hardware (4 and
5) and separate the seal plate (2) and gasket (3)
from the bearing housing (6). Remove the seal
plate O‐ring (34). Position the seal plate on a flat
surface with the impeller side down. Use a wooden
dowel or other suitable tool to press on the back
side of the stationary seat until the seat, O‐rings
and stationary element can be removed.
If no further disassembly is required, refer to Seal
Installation.
Shaft and Bearing Removal and Disassembly
(Figure 2)
When the pump is properly operated and main­
tained, the bearing housing should not require dis­
assembly. Disassemble the shaft and bearings
only when there is evidence of wear or damage.