Gorman-Rupp Pumps SFDV4B 1520149 and up - Manual (Page 35)

OM-06407 SF SERIES
PAGE E - 11 MAINTENANCE AND REPAIR
the seal face to ensure that it is clean and dry. If
cleaning is necessary, use clean tissue to wipe
lightly in a circular pattern.
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 O‐ring into the seal plate as described
above. Remove the tissue and inspect the seal face
to ensure that it is clean and dry.
Install a new O‐ring (6) on the shoulder of the inter­
mediate (8, Figure E-2).
Carefully position the seal plate and stationary seal
components on the rotor shaft. Align the holes in
the seal plate for the capscrews (17) with those in
the intermediate and slide the seal plate onto the
shaft until fully seated against the intermediate. Be
careful not to damage the stationary seat already
installed in the seal plate. Secure the seal plate to
the intermediate with the flat head capscrews (17).
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 (19) until the seal face is just flush with the
undercut 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 (21). See Figure E-3 for
proper order of seal assembly.
Impeller Installation
(Figure E-1)
Inspect the impeller (2) for cracks, broken vanes,
or wear from erosion and replace it if damaged.
Clean the threads in hole in the rotor shaft for the
impeller screw (4).
Install the same thickness of adjusting shims (19)
as previously removed. Install the impeller key (16,
Figure E-2) in the rotor shaft keyway. Align the
keyway of the impeller (2) with the shaft key and
push the impeller onto the shaft until seated firmly
against the upper 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 impeller screw (4) with `Loctite Threadlocker
No. 242' or equivalent compound. Install the impel­
ler washer (3) and the impeller screw. Wedge a soft
metal bar between the vanes of the impeller to pre­
vent rotation and torque the impeller screw to 27 ft.
lbs. (3,7 m. kg.).
Remove the block of wood and turn the impeller to
check for free rotation.
Pump Casing Installation
(Figure E-1)
Install a new O‐ring (16) on the shoulder of the seal
plate. Orient the pump casing (1) as shown in Fig­
ure E-1 and slide it over the seal plate shoulder
until fully seated. Apply “Never‐Seez” or equivalent
compound to the capscrews (9) and secure the
pump casing to the seal plate and motor assembly
(7) with the hardware (8 and 9). Torque the caps­
crews to 47 ft. lbs. (6,5 m. kg.).
Final Assembly
If the pump guide shoe was removed for disassem­
bly, install a new guide shoe seal and secure the
seal and guide shoe to the pump casing with the
previously removed hardware.
Use a suitable lifting device to reposition the pump
in the wet well or sump.