Gorman-Rupp Pumps 610M20B-B 699260 and up - Manual (Page 23)

OM−01912 60 SERIES
MAINTENANCE & REPAIR PAGE E − 5
good repair and with adequate capacity
to prevent injuries to personnel or dam-
age to equipment. If slings or chains are
used to move the pump or components,
make sure that the load is balanced;
otherwise serious personal injury or
death could result. Suction and dis-
charge hoses and piping must be re-
moved from the pump before lifting.
If the impeller (2) is to be removed, the impeller nut
(52) should be loosened before removing the
pump casing. Immobilize the impeller by inserting
a wood block through the pump discharge and
into the impeller vanes. Remove the inserts (53)
and loosen the setscrews (54). Remove the impel-
ler nut and washer (51). Remove the wood block
from the pump discharge.
Support the pump casing using a suitable hoist
and sling. Remove the hardware (41) securing the
pump casing to the pedestal (23).
Pull the pump casing straight away from the ped-
estal to prevent binding on the impeller. Remove
the casing gasket (9) and clean the mating sur-
faces.
Impeller Removal
There are no provisions for draining all of the oil
from the seal cavity. To limit the amount of spillage
when removing the impeller and seal (3), first re-
move the bottle oiler (12) and piping (13, 14 and
15) from the seal plate (5). The remaining oil will es-
cape when the seal is removed. Be sure to have
shop rags or other absorbent materials available to
clean up any spills.
The impeller is secured to the shaft by the shaft key
(55) Use a gear puller to remove the impeller from
the shaft. Retain the shaft key.
Inspect the impeller and its integral wear ring for
excessive wear or scoring.
Proper impeller wear ring replacement re-
quires dynamic balancing of the impeller
assembly after the wear ring is welded to
the impeller. Failure to properly install the
wear ring and balance the impeller assem-
bly can result in premature shaft, seal or
bearing failure, or other damage to the
pump.
To replace the wear ring, grind off the four weld
spots securing the wear ring to 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 three seals; a primary
mechanical seal (3) located directly behind the im-
peller, a secondary oil seal (42) in the middle of the
seal plate (5), and packing (10) at the back of the
seal plate. If the liquid being pumped leaks through
the packing, all three seals should be replaced im-
mediately. It is recommended that all three seals be
replaced whenever the primary seal (2) requires re-
placement.
Remove the seal washer (50) and spring. Slide the
rotating portion of the seal off the shaft. As the seal
is removed, the remaining seal lubricating oil will
escape from the seal plate. Be sure to have shop
rags or other absorbent materials available to
clean up any spills.
To ease removal of the remaining seal compo-
nents, it is recommended that the seal plate be re-
moved. Loosen, but do not remove, the lock nuts
(37) securing the halves of the split gland (11). Re-
move the machine screws (39) and slide the seal
plate and remaining seal components off the shaft
as a unit.
Position the seal plate on a flat surface with the im-
peller side down. Remove the lock nuts (37), clips
(38) and both halves of the split gland. Use a suit-
able tool to remove the packing rings from the back
of the seal plate.
Reposition the seal plate with the impeller side up.
Pull the stationary seal seat and O-ring out of the
seal plate bore.
Use a suitable tool to pry the oil seal (42) out of the
seal plate.
If no further disassembly is required, refer to Seal
Installation.