Gorman-Rupp Pumps SF4A-X 1531245 and up - Manual (Page 45)

SF SERIES X‐PROOF PUMPS OM-06629
MAINTENANCE AND REPAIR PAGE E - 22
above. Remove the tissue and inspect the seal face
to ensure that it is clean and dry.
Install a new O‐ring on the shoulder of the interme­
diate.
Carefully position the seal plate and stationary seal
components on the rotor shaft. Align the holes in
the seal plate for the capscrews with those in the
intermediate and slide the seal plate onto the shaft
until fully seated against the intermediate. Be care­
ful not to damage the stationary seat already
installed in the seal plate. Secure the seal plate to
the intermediate with the flat head capscrews.
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.
Lubricate the I.D. of the bellows with water and
slide the rotating subassembly over the shaft
sleeve until the seal face is just flush with the under­
cut end of the sleeve.
Slide the assembled shaft sleeve and rotating por­
tion of the seal and onto the rotor shaft until the pol­
ished faces contact. Continue to push the sleeve
through the seal until it is fully seated against the
shaft shoulder.
Install the seal spring over the bellows retainer and
install the spring retainer (if so equipped). See Fig­
ure E-2 for proper 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. If your pump is not equipped with a spring re­
tainer, make sure the seal spring seats squarely
over the shoulder on the back of the impeller.
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.
Suction Head and Wear Ring Installation
The suction head and wear ring must be installed
in the pump casing before installing the pump cas­
ing in order to set the impeller‐to‐wear ring clear­
ance.
If the wear ring was removed from the suction
head, position the replacement wear ring in the
suction head bore and use an arbor (or hydraulic)
press to press the wear ring into the suction head
until fully seated.
Install a new O‐ring on the shoulder of the suction
head. Position the suction head against the pump
casing and use the previously removed hardware
to press the suction head into the pump casing.
Adjust the impeller‐to‐wear ring clearance after
installing the pump casing as described below.
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.