Gorman-Rupp Pumps PA4E71C-3TNV88-SE 1416614 and up - Manual (Page 49)

OM−06244 PA SERIES
MAINTENANCE & REPAIR PAGE E − 27
Turn
Counterclockwise
Lathe Dog Arm
V" Notch
Shaft Key
Impeller Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Figure 14. Loosening Impeller
Pump Casing Removal
(Figure 6)
Support the pump casing using a suitable hoist
and sling.
Remove the hardware (8 and 9) securing the pump
casing (1) to the rotating assembly (2). Pull the
pump casing straight away from the rotating as-
sembly to prevent binding on the impeller. Remove
the shims (6) and clean the contacting surfaces.
Impeller Removal
(Figure 10)
With the rotating assembly removed from the
pump casing, unscrew the impeller (1) from the
shaft (25). Use caution when unscrewing the im-
peller; tension on the shaft seal spring will be re-
leased as the impeller is removed. Inspect the im-
peller and replace if cracked or badly worn.
Remove the impeller adjusting shims (3); tie and
tag the shims, or measure and record their thick-
ness for ease of reassembly.
Seal Removal
(Figures 10 and 15)
Slide the integral shaft sleeve and rotating portion
of the seal off the shaft as a unit.
Use a pair of stiff wires with hooked ends to remove
the stationary element and seat.
An alternate method of removing the stationary
seal components is to remove the hardware (8 and
9) and separate the seal plate (5) and gasket (6)
from the bearing housing (10). 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 re-
moved.
Remove the shaft sleeve O-ring (4) and seal plate
O-ring (27).
If no further disassembly is required, refer to Seal
Installation.
Shaft and Bearing Removal and Disassembly
(Figure 10)
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.
Disengage the hardware (18 and 19) and remove
the mounting flange (20), gasket (21) and oil seal
(7B). Press the oil seal from the mounting flange.
Place a block of wood against the impeller end of
the shaft (25) and tap the shaft and assembled
bearings (23 and 26) from the bearing housing.
Press the oil seals (7 and 7A) from the bearing
housing.
After removing the shaft and bearings, clean and
inspect the bearings in place as follows.
To prevent damage during removal from
the shaft, it is recommended that bearings