Gorman-Rupp Pumps PA4A60C-B-E30 575/3 1482736 and up - Manual (Page 43)

PA SERIES OM−06440
MAINTENANCE & REPAIR PAGE E − 16
(Figure 4)
Install a pair of S" hooks in two opposing holes in
the moounting flange (18). Connect a sling and
suitable lifting device to the S" hooks.
Remove the hardware (9 and 10) securing the
pump casing (1) to the rotating assembly (2). Use
the lifting device to pull the rotating assembly up
out of the pump casing and position it on the work
surface. Remove the shims (12) and clean the con-
tacting surfaces. Tie and tag the shims or measure
and record their thickness for ease of reassembly.
(Figure 3)
Inspect the wear plate assembly (7) for excessive
wear or scoring and replace as required. If replace-
ment of the wear plate assembly is required, posi-
tion the pump casing horizontally on the work sur-
face. Disengage the hardware (2 and 3) and pull
the wear plate assembly out of the pump casing.
Impeller Removal
(Figure 4)
With the rotating assembly removed from the
pump casing, unscrew the impeller (1) in a coun-
terclockwise direction (when facing the impeller).
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 it 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 4 and 9)
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 (3) from
the bearing housing (11). 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 4)
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 (15A) 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). Use a suitably sized dowel to 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) from the bearing housing.
Remove the bearing housing O-ring (29).
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.