OM-06099
S SERIES PUMPS
PAGE E - 11
MAINTENANCE AND REPAIR
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.
Apply a
light
coating of oil to the seal seating sur
face on the shaft, the groove for the retaining ring
(14), 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 retainer. Install the seal
retaining ring (14). See Figure E-3 for the proper
order of seal assembly.
Lower Seal Installation
(Figures E-1 and E-3)
Thoroughly clean the gasket surfaces and seal
bore of the diffuser (1). The seal bore must be free
of burrs and nicks which could damage the seal.
Inspect the diffuser for cracks, distortion, or ero
sion and replace it if defective.
Position the diffuser 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 diffuser bore
and the O.D. of the seal seat and O‐ring. Keep the
sealing face dry.
Position the subassembly in the diffuser 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.
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.
Secure the diffuser gasket (8) to the diffuser using
a light coating of `3M Gasket Adhesive No. 847' or
equivalent compound.
Carefully position the diffuser and stationary seal
components on the rotor shaft, over the studs (59)
and against the intermediate (50).
Be careful
not
to damage the stationary element already in
stalled.
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.
Apply a
light
coating of oil on the shaft and the I.D.
of the bellows.
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.
Slide the seal spring over the shaft and bellows re
tainer. See Figure E-3 for proper order of seal as
sembly.
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 on the rotor shaft to remove any
old thread locking material. Be sure the impeller
bore and the shaft are free of oily film and com
pletely dry.
Install the upper impeller washer (10) with the in
side chamfer toward the shaft shoulder. Install the
adjusting shims (9) and the impeller key (64). Align
the keyway of the impeller (2) and push the impel
