Gorman-Rupp Pumps 610M20B-B 699260 and up - Manual (Page 28)

60 SERIES OM−01912
MAINTENANCE & REPAIR PAGE E − 10
Step 1: Determine how much bulk packing will
be required to fill the packing cavity, and
wrap it around a rod of the same diameter as
the shaft. With the packing wrapped around
the rod, cut through each turn as shown.
If the cut rings are too thick and will not fit in
the packing cavity, place each turn on a
clean piece of paper and use a length of
pipe, as you would a rolling pin, to roll the
ring until the thickness has been reduced.
Never attempt to flatten a packing ring with
a hammer.
Right Wrong
Step 2: It is critical that the ends of the cut pack-
ing rings meet in a tight parallel fit to ensure
proper sealing. Check this fit; it should be
correct if the packing was cut while wrapped
around a rod, but if the packing was cut
while laid out straight, the ends will meet at
an angle. Never install a packing ring with
an angled gap; pressure on adjacent pack-
ing rings will cause them to work into the
gap and prevent the angled ring from clos-
ing properly around the shaft.
Some channel-type packing with a lead
core may require a slight gap between pack-
ing ring ends to allow for expansion. Consult
the packing manufacturer’s installation in-
structions and follow his recommendations.
Step 3: Lubricate all metallic packings (foil type,
lead core, etc.) with the lubricant recom-
mended by the packing manufacturer. In
general, swabbing the inside diameter of
this type packing with SAE No. 30 non-de-
tergent oil provides sufficient lubrication.
Dip the new packing in non-detergent oil before
installation. Push each packing ring into the seal
plate and compress it using a blunt ended sleeve
the same diameter as the split gland and a mallet.
Each successive layer must be compressed and
rotated by 90
_ to prevent excessive leakage. Add
enough packing to fill the seal plate to within 3/8
inch of the end.
Install the bottle oiler and piping (12, 13, 14 and 15)
in the seal plate and lubricate the primary seal (3)
as indicated in LUBRICATION after the impeller
and remaining pump components are installed.
Impeller Installation
Proper replacement of the impeller wear
ring requires dynamic balancing the impel-
ler assembly after the wear ring is welded
to the impeller. Failure to properly install
the wear ring and balance the impeller as-
sembly can result in premature shaft, seal
or bearing failure, or other damage to the
pump.
Inspect the impeller, and replace it if cracked or
badly worn. If the impeller wear ring was removed,
chill the impeller by refrigeration and use an induc-
tion heater or oven to heat the new wear ring. Slide