Gorman-Rupp Pumps SFV4E 1491311 and up - Manual (Page 34)

SF SERIES OM-06431
MAINTENANCE AND REPAIR PAGE E - 10
Clean the rotor shaft (3) and seal cavity area of the
intermediate (8). Be sure the area is dry and free of
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.
Position the intermediate with the impeller end
down on some wood blocks tall enough to allow for
installation of the rotor shaft through the intermedi­
ate.
Inspect the rotor shaft (3) and bearings (2 and 5) as
indicated in Bearing and Rotor Shaft Installation
in this section and replace any parts as necessary.
Slide the assembled shaft and bearings into the in­
termediate until the lower bearing seats squarely in
the intermediate bore. Secure the rotor and shaft to
the intermediate by installing the snap ring (4) in
the groove in the intermediate bore.
Install a new O‐ring (6) on the shoulder of the inter­
mediate.
With the motor housing and stator positioned up­
side down, carefully lower the assembled inter­
mediate, rotor shaft and bearings into the motor
housing until the female terminal (14) can be se­
curely attached to the male terminal (15) on the
moisture sensor.
Position the intermediate so the holes for the
mounting hardware in the intermediate align with
those in the motor housing and press the inter­
mediate into the motor housing until fully seated.
Apply “Never‐Seez” or equivalent compound on
the threads of the capscrews (12) and secure the
intermediate to the motor housing with the hard­
ware (11 and 12). Torque the capscrews to 47 ft.
lbs. (6,5 m. kg.).
Subassemble the O‐ring onto the stationary seat.
Position this subassembly in the intermediate 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 cir­
cular 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.
Lubricate the I.D. of the bellows with water and
slide the rotating subassembly onto the rotor shaft
until the seal faces contact.
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.
Lubricate the seal sleeve O‐ring (17) with light oil
and slide it onto the rotor shaft until it is seated
against the shaft shoulder. Use caution not to nick
or damage the O‐ring on the shaft keyway.
Position the seal plate on a clean flat surface with
the impeller side up.
Unpack the seal stationary seat and O‐ring. Apply
a light coating of oil to the seal plate bore and the
O.D. of the stationary seat O‐ring. Keep the sealing
face dry.
Position the stationary seat and O‐ring in the seal
plate 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