Gorman-Rupp Pumps 11 1/2A52-E2 3P 1235018 and up - Manual (Page 25)

OM-04829 10 SERIES
MAINTENANCE & REPAIR PAGE E - 5
Pump Casing Removal
Death or serious personal injury and
damage to the pump or components
can occur if proper lifting procedures
are not observed. Make certain that
hoists, chains, slings or cables are in
good working condition and of suffi­
cient capacity and that they are posi­
tioned so that loads will be balanced
and the pump or components will not be
damaged when lifting. Suction and dis­
charge hoses and piping must be re­
moved from the pump before lifting. Lift
the pump or component only as high as
necessary and keep personnel away
from suspended objects.
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).
Tie and tag the gaskets, or measure and record
their thickness for ease of reassembly.
Clean the mating surfaces of the intermediate and
pump casing.
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. Tie and tag the shims or measure and
record their thickness for ease of reassembly.
Seal Removal and Disassembly
Remove the impeller shims and spring retainer (11
and 12) 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 bel­
lows. Slide the rotating portion of the seal off the
sleeve.
To remove the stationary seat, remove the hard­
ware (20 and 21), and slide the stationary 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 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.