Gorman-Rupp Pumps 81 1/2D3-B 359802 and up - Manual (Page 24)

OM−00749 80 SERIES
MAINTENANCE & REPAIR PAGE E − 5
Impeller Removal
Immobilize the impeller by wedging a block of
wood or a brass rod between the vanes. Remove
the impeller jam nut (28).
Install the shaft key (18). Install a lathe dog on the
drive end of the shaft (19) with the V" notch posi-
tioned over the shaft key.
With the impeller rotation still blocked, see Figure 2
and use a long piece of heavy bar stock to pry
against the arm of the lathe dog in a counterclock-
wise direction (when facing the drive end of the
shaft). Use caution not to damage the shaft or key-
way. When the impeller breaks loose, remove the
lathe dog, key and wood block. Unscrew the im-
peller in a counterclockwise direction.
Turn
Counterclockwise
Lathe Dog Arm
V" Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 2. Loosening Impeller
Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (16)
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)
Carefully remove the seal washer (17), spring seat
and seal spring. Apply oil to the impeller shaft and
work it up under the bellows. Slide the rotating por-
tion of the seal off the impeller shaft.
Slide a pair of stiff wires with hooked ends along
the shaft and use them to pull the stationary ele-
ment and seat from the intermediate bore.
An alternate method of removing the stationary
portion of the seal is to remove the hardware (10,
11 and 12) securing the intermediate to the bearing
housing (13). Carefully slide the intermediate and
rotating portion of the seal assembly off the shaft.
Position the intermediate on a flat surface with the
impeller side down. Use a suitably sized dowel to
press the seal stationary seat and element out of
the intermediate from the back side.
If no further disassembly is required, see Seal
Reassembly and Installation.
Shaft And Bearing Removal And Disassembly
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.
Shaft and bearing disassembly in the field
is not recommended. These operations
should be performed only in a properly
equipped shop by qualified personnel.
Remove the slinger ring (23) from the shaft. Re-
move the bearing housing mounting hardware
from the base. Tie and tag any shims used under
the mounting feet for leveling.
Use snap ring pliers to remove the bearing retain-
ing ring (20) from the bearing housing bore. Re-
move the bearing shim set (21); tie and tag the
shims, or measure and record their thickness for
ease of reassembly.
Place a block of wood against the impeller end of
the shaft, and tap the shaft and assembled bear-
ings (14 and 15) out of the bearing housing.
After removing the shaft and bearings, clean and
inspect the bearings in place as follows.