7
3. By inspection, determine whether it is necessary to
replace the ball bearings (16) & (18). If so, press on
inner race of the shielded side of the bearing and not
against the outer race of the bearing or the shaft
shoulder.
J - REASSEMBLING OF SHAFT AND
BEARINGS
1. To replace bearings slide bearing (18) over the coupling
end of the shaft (shielded side fi rst) until the inner race
is tight against the shaft shoulder. Then slide
bearing (16) onto the tapered end of the shaft, shielded
side fi rst, Apply fresh grease, of the proper grade,
between the races of each bearing. Also fi ll bearing
housing in the support head about 1/4 full of
grease. Never use any of the old grease.
2. Inspect felt ring (40) in the bearing cover (37) and in the
bearing adjusting nut (204). To replace felt rings remove
clamping rings (257) and insert new felt rings. Press
clamping rings into position.
3. Insert shaft (6) into support head from coupling end,
tapered end fi rst. When shaft starts thru bearing
adjusting nut (204), place slinger (40) over the end of
the shaft. Push shaft thru support head until bearing (18)
is tight against adjusting nut. Place bearing adjusting
spring (347) over coupling end of shaft and place
bearing cover gasket (303) on bearing cover. Slide
bearing cover over end of shaft and push against end
of support head compressing bearing adjusting spring
suffi ciently to replace bearing cover cap screws
(213). Tighten cap screws securely. Place shaft key (46)
in keyway on end of pump shaft and press pump half of
drive coupling onto shaft. Tighten set screws.
K - REASSEMBLY OF LIQUID END
1. If stuffi ng box head (11) was removed, place stuffi ng box
head over shaft in manner shown with slots for bolts and
nuts on the horizontal centerline. The holes in the fl ange
of the stuffi ng box head should be in line with those in
the frame (19).
2. Insert casing cap screws (215) thru holes in support
head and stuffi ng box head and position gasket (73) on
the stuffi ng box head. Place casing (1) on the
support head with discharge in the desired position.
Tighten casing cap screws securely. Connect by-pass
tubing (127) to casing.
3. Seat impeller key (32) in shaft keyway and place
impeller (2) on shaft with keyway over impeller key.
Place a wooden block over impeller vanes and tap on
wood to seat impeller on the shaft taper. Replace
impeller washer (270) on the shaft and then the
castellated nut (24). Tighten nut securely. DO NOT USE
IMPELLER NUT TO DRAW IMPELLER ONTO SHAFT,
NUT IS A LOCKING DEVICE ONLY.
4. Replace cotter pin (269) in castellated nut.
5. Position suction head gasket (73) on frane (19)
and replace suction head on the casing. Fasten in place
with cap screws (215).
6. Replace gland bolts (209) and nuts (210) and tighten
“fi nger tight”. Check impeller adjustment per Section E
and replace bearing adjusting nut clip (66) and screw
(337). See Section F for proper stuffi ng box adjustment.
L - REPACKING STANDARD STUFFING BOX
1. Remove stuffi ng box bolts (209) and nuts (210) also
gland bolts and nuts and remove gland from shaft. With
a packing puller, remove the old stuffi ng box packing
(13) and lantern ring (29) from the stuffi ng box (17).
2. Make sure that the correct packing is used for liquid
being pumped.
3. Cut fi ve rings of packing so that when wrapped around
the shaft, the ends just touch.
4. Tamp fi rst ring into stuffi ng box, then turn shaft over by
hand.
5. Stagger the next packing ring joint so that the joinst will
be 180º apart. Seat ring evenly and tamp into place.
Turn shaft again by hand.
6. Place lantern ring (29) in next.
7. Postion and seat the next three rings of packing
separately, staggering the joints 180º apart. Tamp into
place.
8. Replace stuffi ng box gland, (17) fastening the two halves
together with gland bolts and nuts. Replace and tighten
stuffi ng box bolts and nuts (209) and (210), then loosen
nuts until shaft can be turned freely by hand. See
section “F” for proper adjustment.
M - TO REPLACE SINGLE MECHANICAL SEAL
Refer to Figure 4.
NOTE: Seals are available as a complete assembly only.
1. Special precautions must be observed when handling
a mechanical seal. DO NOT drop seal face carbons, or
fl oating seats, nor scratch the lapped faces of these
parts.
2. To remove the seal assembly, dismantle the liquid end
of the pump as described in Section “H”. After removing
the casing, the seal head assembly may be removed
from the support head. Press the seat gasket (B) and
fl oating seat (C) from the seal head (52).
3. To install new seal assembly, oil the outer surface of the
seat gasket (B) and press seat gasket and fl oating seat
assembly (B) and (C) into the seal head cavity. DO NOT
SCRATCH FACE OF FLOATING SEAT.
To Next Page
Loading...