Gorman-Rupp Pumps SFV4A-X 1531245 and up - Manual (Page 44)

OM-06628 SFV SERIES X‐PROOF PUMPS
PAGE E - 21 MAINTENANCE AND REPAIR
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.
LUBRICATION
Seal Cavity
Before installing or removing the lubrica­
tion plugs, always make sure the pump is
completely cool, and clean the area
around the plugs to prevent contamination
of the oil.
Check the oil level in the seal cavity before initial
startup, after the first two weeks of operation, and
every month thereafter.
Check the oil level only when the pump
is cool. If the oil level plug is removed
when the pump is hot, pressure in the
seal cavity can cause hot oil to be
ejected as the plug is removed.