Gorman-Rupp Pumps PA6B60-6068H 1421583 and up - Manual (Page 36)

PA SERIES OM−06250
MAINTENANCE & REPAIR PAGE E − 14
capscrews in the tapped holes in the impeller and
use a suitable puller to remove the impeller from
the shaft. Use caution when removing the impeller;
tension on the seal spring will be released when
the impeller is removed. Retain the impeller key
(44). Remove the metal bar from the impeller
vanes.
Remove the impeller adjusting shims (4). For ease
of reassembly, tie and tag the shims or measure
and record their thickness.
Seal Removal and Disassembly
(Figure 4)
Carefully remove the spring retainer and seal
spring. Slide the shaft sleeve (5) and rotating por-
tion of the seal assembly (3) off the shaft as a unit.
Remove the shaft sleeve O-ring (6)
Apply oil to the sleeve and work it up under the bel-
lows. Slide the rotating portion of the seal off the
sleeve.
Use a pair of stiff wires with hooked ends to remove
the stationary seat and O-ring from the pump cas-
ing bore.
NOTE
An alternate method of removing the stationary por-
tion of the seal is to remove the pump casing and
then press the seal components out of the pump
casing from the back side.
If no further disassembly is required, refer to Seal
Reassembly And Installation.
Pump Casing Removal
(Figure 4)
Support the pump casing using a suitable hoist
and sling and remove the hardware securing the
casing to the base.
Remove the hardware (34 and 35) securing the
casing to the intermediate (9). Separate the parts
by pulling the casing straight away from the inter-
mediate. Remove any leveling shims from under
the casing feet. Tie and tag the shims for ease of
reassembly. Remove the casing gasket (8).
Inspect the balance ring (36) for excessive wear or
scoring. If replacement is required, use a small bit
to drill three holes horizontally, 120
_ apart, through
the wear ring. Use a chisel or other suitable tool to
complete the cuts through the wear ring. Use cau-
tion not to damage the pump casing.
Separating Intermediate and Drive Assembly
From Engine
(Figure 4)
To service the bearing (12) or drive components,
the intermediate must be separated from the en-
gine. Support the intermediate using a suitable
hoist and sling and remove the hardware (22 and
23) securing the intermediate to the engine bell-
housing. Separate the assemblies by pulling the
intermediate straight away from the engine.
As the assemblies separate, the metal hub portion
of the coupling assembly will remain on the shaft.
To remove the hub from the shaft, loosen the allen
head setscrew in the hub. Slide the hub off the
shaft and remove the shaft key (19).
It is not necessary to remove the elastic element
portion of the coupling from the engine flywheel
unless the coupling must be replaced. To remove
the element, disengage the hardware (23 and 24)
securing it to the flywheel.
Inspect the pilot bushing (21) for excessive wear. If
replacement is required, it can be easily removed
from the engine flywheel by making a hydraulic
ram from a piece of steel bar stock. Turn the ram to
a diameter of 0.983 inch (25 mm).
When performing the following procedure,
grease can be ejected with great force.
Wear safety glasses or goggles to prevent
injury.
Completely pack the bore of the pilot bushing with
grease. Insert the end of the ram into the I.D. of the
bushing. Strike the ram sharply with a hammer,
compressing the grease, and forcing the bushing
out of the flywheel. Use additional grease as re-
quired, and continue to strike the ram until the
bushing is completely free.