Gorman-Rupp Pumps PA4E71C-3TNV88-SE 1416614 and up - Manual (Page 48)

PA SERIES OM−06244
MAINTENANCE & REPAIR PAGE E − 26
otherwise serious personal injury or
death could result. Suction and dis-
charge hoses and piping must be re-
moved from the pump before lifting.
(Figure 9)
Removing the pump and drive assembly first re-
quires separating the air compressor (57) from the
pump assembly.
Disengage the hardware (14, 22, 56 and 65) and
remove the guard (64). Loosen the uppermost
nuts (17) on the threaded rods (75) enough to be
able to remove the cog belt (71) from the sprocket
(60).
Remove the hardware (14, 56 and 82) securing the
mounting plate (81) to the rotating assembly
mounting flange (20, Figure 10).
It is not necessary to remove the piping from the air
compressor to separate it from the pump. The
hoses are long enough to permit repositioning the
compressor to provide room for pump end remov-
al. Use a sling and suitable lifting device to reposi-
tion the compressor to allow room for pump end re-
moval and secure it to prevent movement.
See Figure 3 and remove the air intake cover as-
sembly (42) from the base (39). Support the pump
end using a hoist and sling, and remove the hard-
ware securing the suction support bracket (16, Fig-
ure 6) to the base.
See Figure 6 and place a clean drip pan under the
outlet for the drain assembly (90). Open the drain
assembly valve and drain the oil from the seal and
bearing cavities. Inspect the seal oil for water, dirt
or a cloudy condition which could indicate seal fail-
ure.
After draining the bearing and seal cavities, dis-
connect the lines for the drain assembly from the
bearing housing (10, Figure 10).
See Figure 13 and remove the hardware (3 and 4)
securing the intermediate to the engine bellhou-
sing. Remove the intermediate guards (17, Figure
10) and separate the assemblies by pulling the-
pump assembly straight away from the engine.
(Figure 13)
As the assemblies separate, the flexible portion of
the coupling assembly (2) will remain on the shaft.
To remove the coupling from the shaft, unscrew the
capscrews from the bushing (7). Screw one of the
capscrews into the puller hole in the circumference
of the bushing. As the coupling and bushing sepa-
rate, remove the bushing and slide the coupling off
the shaft. Remove the bushing key.
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) securing it to the flywheel.
Remove any leveling shims used under the casing
mounting feet. Tie and tag the shims for ease of
reassembly.
Move the pump end to a clean, well-equipped
shop area for further disassembly.
(Figure 9)
Remove the cog belt (71). Remove the setscrews
from the center of the bushing (70). Reinstall the
one of the setscrews in the tapped hole in the bush-
ing and tighten it to jack" the bushing out of the
drive sprocket (74). Slide the bushing and drive
sprocket off the shaft. Remove the key (10).
Loosening Impeller
(Figure 6)
With the pump end separated from the engine,
wedge a block of wood between the vanes of the
impeller (1, Figure 10) and the pump casing (1) to
prevent rotation.
Install the shaft key (24, Figure 10) in the shaft key-
way. Install a lathe dog on the drive end of the shaft
(25, Figure 10) with the V" notch positioned over
the shaft key.
With the impeller rotation still blocked, see Figure
14 and use a long piece of heavy bar stock to pry
against the arm of the lathe dog in a counterclock-
wise direction (when facing the drive end of the
shaft). Use caution not to damage the shaft or key-
way. When the impeller breaks loose, remove the
lathe dog, key and wood block.