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Gorman-Rupp Pumps PA4A60C-F3L 1303165 and up User Manual

Page 41

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OM−05765

PA SERIES

MAINTENANCE & REPAIR

PAGE E − 19

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 (23, Figure 5).

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 (4 and 5) securing it to the fly-
wheel.

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 3)

Remove the belt (9). Remove the capscrews from
the center of the bushing (25). Reinstall the caps-
crews in the tapped holes in the bushing and tight-
en them in an alternating pattern until the bushing
is jacked" out of the sprocket (24). Slide the bush-
ing and sprocket off the shaft. Remove the key (31,
Figure 5).

Draining Oil From Seal Cavity

(Figure 5)

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
pump casing is removed.

Position a clean container under the seal cavity
drain plug (15A). Remove the plug and drain the oil
from the seal cavity into the container. For shorter
drain time, remove the vented plug (10). Clean and
reinstall the drain plug and vent plug. Inspect the
oil for water, dirt or a cloudy condition which could
indicate seal failure.

Loosening Impeller

(Figure 5)

With the pump end separated from the engine,
wedge a block of wood between the vanes of the
impeller (1) and the pump casing (1, Figure 4) to
prevent rotation.

Install the shaft key (23) in the shaft keyway. Install
a lathe dog on the drive end of the shaft (24) with
the V" notch positioned over the shaft key.

With the impeller rotation still blocked, see Figure
10 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.

Turn

Counterclockwise

Lathe Dog Arm

V" Notch

Shaft Key

Impeller Shaft

Lathe Dog

Setscrew

Heavy

Bar Stock

Figure 10. Loosening Impeller

Pump Casing And Wear Plate Removal

(Figure 4)

Support the pump casing using a suitable hoist
and sling.

Use lifting and moving equipment in
good repair and with adequate capacity
to prevent injuries to personnel or dam-