Gorman-Rupp Pumps PAH8A60C-B 1537579 and up - Manual (Page 35)

OM-06455 PAH SERIES
MAINTENANCE & REPAIR PAGE E - 13
washer (3, Figure 3) and roll pin (4, Figure 3). Re­
move the metal bar or rod blocking impeller rota­
tion.
Support the pump casing (1) using a suitable hoist
and sling. Disengage the hardware (8 and 9) se­
curing the pump casing to the rotating assembly
(6). Use the hoist and sling to pull the pump casing
straight away from the rotating assembly. Use cau­
tion to ensure that the pump casing does not fall
onto and damage the impeller.
Remove and discard the pump casing O‐ring (3A).
Removing Air Compressor
(Figure 1)
Further disassembly of the pump requires remov­
ing the air compressor assembly (5) from the rotat­
ing assembly (6, Figure 2).
Disengage the hardware (23, 24 and 25) and re­
move the belt guard assembly (22).
Remove the hardware (3, 4 and 33) securing the air
compressor assembly to the mounting flange (20,
Figure 3). Use a pry bar to raise the air compressor
high enough to remove the spacers (2). Remove
the belt (20) from the air compressor drive pulley
(not shown).
Disconnect all hoses and fittings from the air com­
pressor and use a suitable hoist and sling to re­
move the air compressor assembly.
Draining Oil From Seal Cavity
(Figure 3)
If any further disassembly is to be performed on the
pump, the seal oil cavity must be drained to pre­
vent the oil in the seal cavity from escaping as the
impeller is removed.
Position a clean container under the seal cavity
drain plug (19B). Remove the plug and drain the oil
from the seal cavity into the container. For shorter
drain time, remove the vented plug (13). Clean and
reinstall the drain plug and vent plug. Inspect the
oil for water, dirt or a cloudy condition which could
indicate seal failure.
Impeller Removal
(Figure 3)
With the pump casing removed, use a suitable
three‐jawed puller to remove the impeller (1) and
key (26) from the shaft (25). Use caution when re­
moving the impeller; tension on the shaft seal
spring will be released as the impeller is removed.
NOTE
An alternate method of removing the impeller is to
insert a pair of wedges 180
_ apart between the im­
peller and seal plate (9). Tap the wedges evenly in
an alternating pattern to “walk” the impeller off the
shaft.
Remove the impeller adjusting shims (5); tie and
tag the shims, or measure and record their thick­
ness for ease of reassembly.
Inspect the impeller and replace if cracked or badly
worn.
If no further disassembly is required, refer to Seal
Installation.
Seal Removal
(Figures 3 and 7)
Remove the spring centering washer and seal
spring. Slide the shaft sleeve (7) and rotating por­
tion of the seal off the shaft as a unit.
Apply oil to the shaft sleeve and work it up under
the rubber bellows. Slide the rotating portion of the
seal off the shaft sleeve. Remove the shaft sleeve
O‐ring (8).
Use a pair of stiff wires with hooked ends to remove
the stationary element and O‐ring from the seal
plate bore.
An alternate method of removing the stationary
seal components is to remove the hardware (15
and 16) and separate the seal plate and gasket
(14) from the pedestal (18). 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 element until the ele­
ment and its O‐ring can be removed.