Gorman-Rupp Pumps 84A2-4024H 1488564 and up - Manual (Page 28)

OM−06412 80 SERIES
MAINTENANCE & REPAIR PAGE E − 9
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 (26, Figure 3).
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.
Loosening Impeller
(Figure 3)
Before loosening the impeller, turn the cross arm
on the automatic lubricating grease cup (16) clock-
wise until it rests against the cover (see Figure 7 in
LUBRICATION). This will prevent the grease in the
cup from escaping when the impeller is removed.
With the pump end separated from the engine and
the suction check valve removed, reach through
the suction port and wedge a block of wood be-
tween the vanes of the impeller and the pump cas-
ing to prevent rotation.
If removed, install the shaft key (26) in the shaft
keyway. Install a lathe dog on the drive end of the
shaft (27) with the V" notch positioned over the
shaft key.
With the impeller rotation still blocked, see Figure 5
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 5. Loosening Impeller
Pump Casing and Wear Plate Removal
(Figure 3)
To service the impeller (2), seal assembly (3), or
seal plate (36), the pump casing must be sepa-
rated from the intermediate.
Install a standard 5/8−11 UNC lifting eye in the
tapped hole in the top of the pump casing. Be sure
to screw the eye into the casing until fully engaged.
Remove the nuts (35) and use a hoist and sling of
suitable capacity to separate the pump casing and
gasket set (37) from the seal plate (36) and inter-
mediate (19).
Do not attempt to lift the complete pump
unit using the lifting eye. It is designed
to facilitate removal or installation of in-
dividual components only. Additional
weight may result in damage to the
pump or failure of the eye bolt.
Inspect the wear plate (38) and replace if scored or
worn. To remove the wear plate, disengage the
hardware (39 and 40) from the wear plate studs,
and pull the wear plate from the pump casing.
Impeller Removal
(Figure 3)
With the impeller loosened as previously de-
scribed in Loosening Impeller, unscrew the im-