OM-06628
SFV & SFEV SERIES X‐PROOF PUMPS
PAGE E - 21
MAINTENANCE AND REPAIR
the seal plate to the intermediate by torquing the
flat head capscrews to the value shown in Table
E-1.
NOTE
If the seal plate was not removed during disassem
bly, cover the stationary element with a clean tissue
and use your thumbs to press the seal stationary
seat and element into the seal plate as described
above. Remove the tissue and inspect the seal face
to ensure that it is clean and dry.
Unpack the rotating portion of the seal. Be certain
the seal face of the rotating element is free of grit or
surface damage. Because the rotating element
may not stay in the bellows retainer when turned
upside down, place a
small
amount of grease at
equal spaces on the back of the element and posi
tion it in the bellows retainer. The grease should
hold the element in position until the seal is in
stalled. Assemble the drive grooves of the rotating
element into the drive lugs of the bellows retainer.
Apply a
light
coating of oil on the shaft and the I.D.
of the bellows.
NOTE
When pressing seal components onto the rotor
shaft, use hand pressure only. A push tube cut from
a length of plastic pipe will aid in installing seal
components. The I.D. of the push tube should be
approximately the same as the I.D. of the seal
spring.
Slide the seal rotating portion onto the lubricated
shaft with the seal face down. Apply firm, steady
pressure on the bellows retainer until it slides down
the shaft and the seal faces contact.
Install the seal spring over the bellows retainer and
install the spring retainer. See Figure E-3 for prop
er order of seal assembly.
Impeller Installation
Inspect the impeller for cracks, broken vanes, or
wear from erosion and replace it if damaged. Clean
the threads on the rotor shaft for the impeller nut.
Install the same thickness of adjusting shims as
previously removed. Install the impeller key in the
rotor shaft keyway. Align the keyway in the impeller
with the shaft key and push the impeller onto the
shaft until seated firmly against the impeller shim
set.
A clearance of .020 to .040 inch (0,51 to 1,02 mm)
between the impeller and the seal plate is recom
mended for maximum pump efficiency. Measure
this clearance and add or remove impeller adjust
ing shims as required.
After
the impeller is installed, coat the threads of
the rotor/shaft or impeller capscrew with `Loctite
Threadlocker No. 242' or equivalent compound.
Install the impeller washer. Wedge a soft metal bar
between the vanes of the impeller or use a strap
wrench to prevent shaft rotation. Torque the im
peller nut or capscrew to the value shown in Table
E-1.
Remove the metal bar or strap wrench used to pre
vent shaft rotation and turn the impeller to check for
free rotation.
Pump Casing Installation
Install a new O‐ring on the shoulder of the seal
plate. Slide the pump casing over the seal plate
shoulder until fully seated. Apply “Never‐Seez” or
equivalent compound to the capscrews and se
cure the pump casing to the seal plate and motor
assembly with the previously removed hardware.
Torque the capscrews to the value shown in Table
E-1.
Final Assembly
If the pump is designed for guide a rail application
and guide shoe was removed for disassembly,
install a new guide shoe seal and secure the seal
and guide shoe to the pump casing with the pre
viously removed hardware.
If the pump is designed for a stand application, se
cure the pump to the stand with the previously re
move hardware.
Use a suitable lifting device to reposition the pump
in the wet well or sump.
