7
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. Line up keyway in shaft sleeve (14) with keyway in
pump shaft. Replace impeller key (32) and gasket (30).
Place impeller (2) on shaft with keyway over impeller
key. Replace gasket (30) and impeller nut (24) and
tighten securely.
4. Position casing gasket (241) on frame (19) and
replace suction head on the casing. Fasten in place with
cap screws (239).
5. Replace gland bolts (209) and nuts (210). See section
“L”. Repacking Standard Stuffi ng Box”. Also, see section
“F”. Proper Adjustment of Stuffi ng Box.”
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 (11).
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 split gland, (17) fastening the two halves
together with gland bolts and nuts. Replace and tighten
stuffi ng box bolts and nuts, 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 5.
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.
Item 33 Tubing & Connector
A
Seal Head
F
Spring
B
Seat Gasket
G
Bellows
C
Floating Seat
H
Spring Holder
D
Seal Face Carbon
J
Spacer
E
Retainer
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 (A).
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.
4. Apply a thin coating of clean light oil (not grease) to the
shaft and reposition seal head (A) on the support head.
Also apply a thin coating of light oil to the inside of the
seal bellows, slide the seal face carbon (D), bellows (G),
retainer (E), spring (F), spring holder (H) and spacer (J)
onto the shaft.
NOTE:
It may be necessary to use a
piece of tubing, slightly larger than the shaft, to push the
bellows and retainer onto the shaft. Apply pressure only
on the “tail section” of the bellows and retainer.
Figure 5
