Gorman-Rupp Pumps SFDV3B 1520902 and up - Manual (Page 34)

SF SERIES OM-06405
MAINTENANCE AND REPAIR PAGE E - 10
lint and dirt. Check the seal bore for burrs or nicks
that might prevent a good seal. Remove them with
a fine file or emery cloth to restore original con­
tours. If the shaft is bent or damaged, the complete
rotor and shaft must be replaced as an assembly.
Apply a light coating of oil to the bore of the inter­
mediate.
Carefully remove the material stuffed into the seat
bore (or unwrap the shaft). Be sure no debris
stopped by the material falls into the seal cavity.
Subassemble the stationary element in the station­
ary seat. Position this subassembly in the interme­
diate bore with the sealing face up and cover the
seal face with a clean tissue. Use your thumbs to
press the assembly into the bore. Apply equal
pressure on opposite sides until the seat contacts
the bore shoulder. Remove the tissue and inspect
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.
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.
NOTE
When pressing seal components onto the shaft,
use hand pressure only. A push tube cut from a
length of plastic pipe will aid in installing seal com­
ponents. The I.D. of the push tube should be ap­
proximately the same as the I.D. of the seal spring.
Apply a light coating of oil to the seal seating sur­
face on the shaft, the groove for the retaining ring
(10) and I.D. of the bellows. Position the seal rotat­
ing portion on the shaft with the seal face down.
Apply firm, steady pressure on the bellows retainer
until it slides down the shaft and the seal faces con­
tact. This step should be done in one continuous
motion to prevent the bellows from sticking or roll­
ing as it passes over the retaining ring groove.
Slide the seal spring over the shaft and bellows re­
tainer and install the spring centering washer. In­
stall the seal retaining ring (10). See Figure E-3 for
the proper order of seal assembly.
Lower Seal Installation
(Figures E-1 and E-3)
Thoroughly clean the O‐ring surfaces and seal
bore of the seal plate (14). The seal bore must be
free of burrs and nicks which could damage the
seal. Inspect the seal plate for cracks, distortion, or
erosion and replace it if defective.
Position the seal plate on a clean flat surface with
the impeller side up.
Unpack the stationary seat and element. Subas­
semble the stationary element in the stationary
seat. Apply a light coating of oil to the seal plate
bore and the O.D. of the seal stationary seat. Keep
the sealing face dry.
Position the subassembly in the seal plate bore,
and cover it with a clean tissue. Use your thumbs to
press the seat into the bore. Apply equal pressure
on opposite sides of the seat until it is fully seated in
the bore. Remove the tissue and inspect the seal
face to ensure that it is clean and dry. If cleaning is
necessary, use clean tissue to wipe lightly in a cir­
cular pattern.
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 (16) 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 element al­
ready installed in the seal plate. Secure the seal
plate to the intermediate with the flat head caps­
crews (16).
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.