Gorman-Rupp Pumps 11 1/2A3-KW1.5 3P 1214536 and up - Manual (Page 23)

OM−05203 10 SERIES
MAINTENANCE & REPAIR PAGE E − 5
Pump Casing Removal
To service the impeller or seal assembly, discon-
nect the discharge piping. Remove the hardware
securing the pump casing (1) to the base.
Tie and tag any leveling shims used under the cas-
ing mounting feet to ease reassembly.
Remove the nuts (14), and separate the pump cas-
ing and gasket set (23) from the intermediate (22).
Clean the mating surfaces of the intermediate and
pump casing. Tie and tag the gaskets, or measure
and record their thickness for ease of reassembly.
Impeller Removal
To loosen the impeller (2), immobilize the motor
shaft, and tap the vanes of the impeller in a coun-
terclockwise direction (when facing the impeller)
with a block of wood or a soft-faced mallet. Be
careful not to damage the impeller vanes. Use
caution when removing the impeller; tension on
the seal spring will be released as the impeller is
unscrewed.
Inspect the impeller and replace it if cracked or
badly worn. Slide the impeller adjusting shims (12)
off the motor shaft. Tie and tag the shims or mea-
sure and record their thickness for ease of reas-
sembly.
Seal Removal and Disassembly
Remove the spring centering washer (11) and seal
spring. Slide shaft sleeve (16) and rotating portion
of the seal off the shaft as a unit. Apply oil to the
sleeve and work it under the bellows. Slide the ro-
tating portion of the seal off the sleeve.
To remove the stationary seat and element, re-
move the hardware (20 and 21), and slide the sta-
tionary portion of the seal and intermediate (22) off
the shaft as a unit. Position the intermediate on a
flat surface with the impeller side down. Use thumb
pressure to press the stationary seat and element
from the intermediate.
Remove the slinger ring (17) from the shaft.
If no further disassembly is required, see Seal
Reassembly and Installation.
Seal Reassembly and Installation
Clean the seal cavity and shaft with a cloth soaked
in fresh cleaning solvent.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven-
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain-
ers.
Inspect the motor shaft for damage. Small
scratches or nicks may be removed with a fine file
or emery cloth. If excessive wear exists, the shaft
will have to be replaced (refer to the motor service
manual).
The seal is not normally reused because wear pat-
terns on the finished faces cannot be realigned
during reassembly. This could result in premature
failure. If necessary to reuse an old seal in an emer-
gency, carefully wash all metallic parts in fresh
cleaning solvent and allow to dry thoroughly.
Handle the seal parts with extreme care to prevent
damage. Be careful not to contaminate precision
finished faces; even fingerprints on the faces can
shorten seal life. If necessary, clean the faces with a
non-oil based solvent and a clean, lint-free tissue.
Wipe lightly in a concentric pattern to avoid
scratching the faces.
Inspect the seal components for wear, scoring,
grooves, and other damage that might cause leak-
age. Clean and polish the shaft sleeve, or replace it
if there are nicks or cuts on either end. If any com-
ponents are worn, replace the complete seal;
never mix old and new seal parts.
If a replacement seal is being used, remove it from
the container and inspect the precision finished
faces to ensure that they are free of any foreign
matter.
To ease installation of the seal, lubricate the O-
rings and shaft sleeve with water or a very small
amount of oil, and apply a drop of light lubricating
oil on the finished faces. Assemble the seal as fol-
lows, (see Figure 2).