Gorman-Rupp Pumps PA4A60C-C2.2T 1394774 and up - Manual (Page 42)

PA SERIES OM-05783
MAINTENANCE & REPAIR PAGE E - 20
assembly to prevent binding on the impeller. Re­
move the shims (12) and clean the contacting sur­
faces. Tie and tag the shims or measure and re­
cord their thickness for ease of reassembly.
Inspect the wear plate assembly (7) for excessive
wear or scoring. If replacement is required, remove
the hardware (2 and 3) and pull the wear plate out
of the pump casing.
Impeller Removal
(Figure 5)
With the rotating assembly removed from the
pump casing, unscrew the impeller (1) from the
shaft (24). 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 (2); tie and
tag the shims, or measure and record their thick­
ness for ease of reassembly.
Seal Removal
(Figures 5 and 12)
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 from the seal plate
(4).
An alternate method of removing the stationary
seal components is to remove the hardware (7 and
8) and separate the seal plate and gasket (5) from
the bearing housing (9). 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.
Remove the shaft sleeve O‐ring (26) and seal plate
O‐ring (27).
If no further disassembly is required, refer to Seal
Installation.
Shaft and Bearing Removal and Disassembly
(Figure 5)
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 bearing housing drain plug (15) and
drain the lubricant. Clean and reinstall the drain
plug.
Disengage the hardware (16 and 17) and remove
the mounting flange (18), gasket (19) and oil seal
(6A). Press the oil seal from the mounting flange.
Place a block of wood against the impeller end of
the shaft (24) and tap the shaft and assembled
bearings (22 and 25) from the bearing housing.
Press the oil seals (6 and 6B) 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
be cleaned and inspected in place. It is
strongly recommended that the bearings
be replaced any time the shaft and bear­
ings are removed.
Clean the bearing housing, shaft and all compo­
nent parts (except the bearings) with a soft cloth
soaked in cleaning solvent. Inspect the parts for
wear or damage and replace as necessary.
Most cleaning solvents are toxic and