Gorman-Rupp Pumps 04B3-F4L 1316966 and up - Manual (Page 28)

0 SERIES OM-01216
MAINTENANCE & REPAIR PAGE E - 8
Use caution not to damage the pump cas­
ing bore when removing the wear ring.
Impeller Removal
(Figure 2)
To remove the impeller (2), disengage the hard­
ware (41, 42 and 43). Install 3/8-16 UNC by 4‐inch
long capscrews in the tapped holes in the impeller.
Use the capscrews and a suitable puller to remove
the impeller from the shaft. Use caution when re­
moving the impeller; tension on the seal spring will
be released as the impeller is removed. Retain the
impeller key (31).
Remove the impeller adjusting shims (17). Tie and
tag the shims or measure and record their thick­
ness for ease of reassembly.
Seal Removal and Disassembly
(Figures 2 and 5)
Remove the spring. Apply oil to the shaft and work
it up under the rubber bellows. Slide the rotating
portion of the seal off the shaft.
Remove the round head machine screws (10) and
slide the seal plate and stationary element off the
impeller shaft as a unit. Press the stationary seal
element and O‐ring out of the seal plate from the
back side.
Inspect the wear ring (26) for excessive wear or
damage. If replacement is required, use a suitable
puller to remove it from the seal plate.
Separating Intermediate and Drive Assembly
From Engine
(Figure 2)
To service the shaft (19), bearing (11) or drive as­
sembly, the intermediate (25) must be separated
from the engine.
(Figure 3)
Support the intermediate using a hoist and sling,
and remove the hardware (7 and 8) securing it to
the engine bellhousing. Separate the assemblies
by pulling the intermediate straight away from the
engine.
As the assemblies separate, the flexible portion of
the coupling assembly (4) will remain on the shaft.
To remove the coupling from the shaft, unscrew the
two allen head setscrews from the bushing (3).
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 (18, Figure 2).
It is not necessary to remove the outer ring of the
coupling from the engine flywheel unless the cou­
pling must be replaced. To remove the ring, disen­
gage the hardware (5 and 6) securing it to the fly­
wheel.
Inspect the pilot bushing (1) 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.
Shaft and Bearing Removal and Disassembly
(Figure 2)
When the pump is properly operated and main­
tained, the shaft and bearing should not require
disassembly. Disassemble the shaft and bearing
only when there is evidence of wear or damage.