
5
C. Mechanical Shaft Seal:
Fig. ULL, ULL-VM
1. To inspect or replace mechanical shaft seal (89)
proceed with removal of casing and impeller.
CAUTION: Do Not scratch or chip the lapped
faces of the seal parts as this will prevent
proper sealing.
2. Unscrew the machine screws (245) and remove
seal retainer (230).
3. Remove capscrews (219) and carefully slide the
adapter (71) and double seal (89) from the motor
and shaft sleeve (14). NOTE: It may be necessary
to firmly twist the exposed end of the rotating seal
assembly to break the seal between the seal
bellows and the shaft sleeve. The inboard seal seat
and rotating assembly will be removed with the
adapter (71).
4. With a tube of the proper size, push the stationary
seal seat from the adapter (71) and seal retainer
(230).
5. Deflector (40) may now be removed.
D. Shaft Sleeve Removal
Shaft sleeve (14) is mounted on the motor shaft by means
of heat shrink fit. To remove the shaft sleeve, dismantle the
liquid end and seal assembly as in A and C and proceed
as follows:
1. With a hand grinder and thin grinding wheel
(approx. 1/8” wide), cut a groove axially along the
sleeve to the shoulder of the motor shaft. Grind
groove as deep as possible (over 2/3 of sleeve
wall) without damaging the motor shaft.
2. After groove has been cut, place a block support
under shaft sleeve and insert a wedge tipped cold
chisel into the groove at the impeller end of the
sleeve. Tap chisel sharply with a hammer until a
crack occurs along the base of the groove.
3. Pry the groove apart and remove the sleeve from
the motor shaft.
REASSEMBLY
E. Shaft Sleeve Replacement
1. After old sleeve has been removed clean shaft
with rmery cloth and wipe thoroughly to remove
metal particales also wipe inside of new sleeve to
be sure that it is clean.
2. Note that new shaft sleeve (14) is chamfered on
end. This end will be installed toward the motor.
3. Place the shaft sleeve in a preheated oven set
at 650ºF to 700ºF for 1½ hours to allow sleeve to
heat uniformly and expand.
4. Place motor in a vertical position with impeller end
of shaft upward.
5. Remove shaft sleeve from the oven and drop
sleeve, chamfered end first, over the shaft; making
certain that end of sleeve is seated against
shoulder of motor shaft.
Note: This operation must be done rapidly without
allowing the shaft sleeve to cool. Do Not allow the
sleeve to stop before it is properly seated.
6. Hold shaft sleeve snug against the shaft shoulder
until shrink begins. Allow the sleeve to cool below
100ºF before proceeding with pump assembly.
7. Replace deflector (40) on the motor shaft.
F. Installing Shaft Seal (89)
If reinstalling old seal, carefully inspect the lapped faces
of the seal members and bellows for damage or wear
and replace if worn. Seals are available as complete seal
assembly only.
Before installing the seal remove any burrs or nicks from
shaft sleeve (14) or exposed end of motor shaft also clean
seal cavity of adapter and retainer.
1. Oil the outer surface of the seal seat o-ring; cover
the seal face with cardboard or heavy paper and
carefully press seat into the adapter (71) with a
piece of tubing having end cut square. Wipe face
of seat.
2. Repeat above, installing seal seat in seal retainer
(230).
3. Lightly oil the shaft sleeve and inside of the seal
bellows. Slide the adapter (71) over the shaft and
replace capscrews (219). Slide the seal rotating
assembly over the shaft sleeve (using a piece of
tubing slightly larger than the shaft sleeve) and
position against seal seat.
4. Replace gasket (233) on seal retainer (230) and
mount on adapter with machine screws (245).
Rotate shaft several times to seat seal faces.
5. Test seal for leakage by applying 20 PSI of water
pressure to seal cavity thru pipe nipple (271).
G. Liquid End
1. Spread a drop of Locite® #601 over the exposed
end of motor shaft and insert impeller key (32) into
the keyway.
2. Clean bore of impeller hub with emery cloth and
wipe clean. Replace impeller (2) on end of motor
shaft. If fit of the impeller onto the shaft is tight,
heat impeller in an oven to 200F to 250F before
placing on shaft. Be sure impeller is seated against
end of shaft sleeve (14).
CAUTION! - DO NOT drive the impeller onto the
shaft as this may damage motor bearings and
shaft seal.
3. Refer to impeller Adjustment and place proper
gasket (283) on casing (1) or adapter flange (71)
and replacing casing capscrews (212).
4. Place gasket (73) on casing (1) or suction cover
(9) and attach suction cover to casing with
capscrews (215). Replace drain plugs and any
external piping to seal chamber.