Gorman-Rupp Pumps PAH4B60-QSB4.5P 1526774 and up - Manual (Page 41)

OM-06609 PAH SERIES
MAINTENANCE & REPAIR PAGE E - 19
Pump Casing Removal
(Figure 5)
Remove the uppermost pipe plug (6) from the
pump casing and install a lifting eye in the hole. Be
sure to screw the lifting eye tightly into the hole as
far as it will go. Attach a sling and suitable lifting de­
vice to the lifting eye and support the pump casing.
Remove the hardware (8 and 9) and use the lifting
device to pull the pump casing straight away from
the rotating assembly (10).
Remove and discard the pump casing O‐ring (4A).
Draining Oil From Seal Cavity
(Figure 6)
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 6)
With the pump casing removed, use an impact
wrench with a hex key to loosen the impeller caps­
crew (2). Remove the capscrew, impeller washer
(3) and roll pin (4).
Use a suitable three‐jawed puller to remove the im­
peller (1) and key (26) from the shaft (25). Use cau­
tion when removing 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 (25); 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.
Seal Removal
(Figures 6 and 10)
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 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.
If no further disassembly is required, refer to Seal
Installation.
Separating Pedestal and Drive Assembly
From Engine
(Figure 9)
Support the pedestal using a hoist and sling, and
remove the hardware remove the hardware (6, 7
and 9) securing the drive flange (21, Figure 6) to
the engine bellhousing. Separate the assemblies
by pulling the pedestal straight away from the en­
gine.
As the assemblies separate, the flexible portion of
the coupling assembly (3) will remain on the shaft.
To remove the coupling from the shaft, unscrew the
two allen head setscrews from the bushing (2).
Screw one of the setscrews into the puller hole on
the circumference of the bushing. As the coupling
and bushing separate, remove the bushing, and
slide the coupling off the shaft. Remove the shaft
key (28, Figure 6).