Gorman-Rupp Pumps 612L20-B 814882 and up - Manual (Page 24)

OM−01395 60 SERIES
MAINTENANCE & REPAIR PAGE E − 5
Support the pump casing using a suitable hoist
and sling.
Remove the hardware (5 and 38) securing the
pump casing to the pedestal.
Pull the pump casing straight away from the ped-
estal to prevent binding on the impeller. Remove
the casing gasket (36) and clean the contacting
surfaces.
Impeller Removal
Before removing the impeller, remove the bottle oil-
er (9) and piping (10 and 11). Remove the seal cav-
ity drain plug (34) and drain the seal cavity oil. This
will prevent oil from escaping when the impeller is
removed.
To loosen the impeller nut, the impeller shaft must
first be disconnected from the power source. With
the power source disengaged, install the key (24)
in shaft keyway. Install a lathe dog on the drive end
of the shaft with the V" notch positioned over the
shaft key.
Use a long piece of heavy bar stock and the lathe
dog as shown in Figure E−2 to block shaft rotation.
Use caution not to damage the shaft or keyway.
Lathe Dog Arm
V" Notch
Shaft Key
Impeller
Shaft
Lathe Dog
Setscrew
Heavy
Bar Stock
Work Surface
Figure E−2. Blocking Shaft Rotation
Loosen the two setscrews (41) and remove the im-
peller nut (40).
NOTE
If necessary, heat the impeller with a torch to aid in
the removal.
The impeller is very heavy and could be
damaged and/or could injure personnel if
it is dropped. Use extreme caution when
performing the following procedure to pre-
vent dropping the impeller when it breaks
loose from the shaft.
The impeller is secured to the shaft by the woodruff
key (50) and a taper fit.To remove the impeller, in-
stall two 3/8-16 UNC capscrews (not supplied) in
the tapped holes in the impeller. Use a gear puller
to preload the impeller. Strike the gear puller shaft
with a hammer to break the impeller loose. Re-
move the impeller and woodruff key.
NOTE
An alternate method of removing the impeller is to
install two wedges 180
_ apart between the impeller
and the seal plate. Tap the wedges alternately until
the impeller breaks loose. If necessary, position a
piece of round bar stock against the end of the im-
peller shaft and strike the bar stock with a hammer
to loosen the taper fit between the impeller and the
shaft.
The wear ring (43) is a shrink fit on the impeller.
Heat the wear ring to remove it from the impeller.
Use caution not to damage the impeller. Pry or
carefully grind the wear ring off the impeller.
Seal Removal
This pump is designed with two seals; a primary
mechanical seal (3) located directly behind the im-
peller and a secondary oil seal (33) located at the
back of the seal plate (35). If the liquid being
pumped leaks past the oil seal, both seals should
be replaced immediately.
Remove the air vent and piping (6, 7 and 8) from
the seal plate (35).
Remove the seal spring. Apply oil to the shaft in the
area of the mechanical seal bellows. Slide the ro-
tating portion of the seal off the shaft.