Goulds Pumps 3408 - IOM - Manual (Page 56)

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3408 IOM 03/99
5. Place the sleeve O-ring (3-914-0) onto the shaft,
into the sleeve counterbore. Assemble the shaft
sleeve nut (3-015-9).
6. Repeat steps 3 through 5 for the inboard shaft
sleeve, O-ring and nut. Wipe off excess RTV.
7. Verify that dimension “C” is maintained, then
using a pin spanner wrench and hammer,
securely tighten the shaft sleeve nuts. Then drill
a shallow recess in the shaft through the set
screw hole in each of the shaft sleeve nuts.
Lock each shaft sleeve nut in position with set
screws (3-902-3). A low strength sealant, such
as Loctite 271, can be used to retain set
screws. (See Fig. 45)
8. Lubricate and roll an O-ring (3-914-2) into the groove
in each casing ring (3-003-9) and slide the casing
rings over the impeller.
NOTE: 8 x 10-20 and 10 x 12-18 utilize “Floating”
Casing Ring Design. Each ring requires 2 O-rings.
(See Fig. 21B)
9. Thoroughly clean the stuffing boxes (3-073-9) to
prevent dirt from entering the seal during startup.
10. Press the stationary seats (0-400-0) of the
mechanical seals into both stuffing boxes with the
lapped surface facing the impeller. Lightly lubricate
the stuffing box bore to ease assembly.
11. Press a new lip seal (3-177-9) into each stuffing box.
Before installing the lip seal, lubricate the lip seal with
a lightweight oil.
NOTE: Lip seals should seat against machined
shoulder in bracket.
NOTE: Seal lip should point away from the
bearings (3-026-3 and -4), if the bearings are
grease lubricated, and towards the bearings,
If the bearings are oil lubricated.
12. Lubricate and roll O-ring (3-914-1) into the groove in
each stuffing box.
13. Obtain the set collar (3-421-9) locating dimension
from the table on Fig. 39 and scribe the dimension
on the shaft sleeve. Install set collar on sleeve per
this dimension. (Reference dimensions “A” and “B”
on Fig. 39.)
NOTE: Each set collar has two set screws. To
positively secure each set collar, drill a shallow
recess in sleeve through the set screw holes.
Retain set screws with a low strength Loctite, 271,
or equal.
NOTE: Steps 14 through 26 must be completed
within 10 to 12 minutes to assure proper placement
of mechanical seals. The mechanical seal used has
an adhesive on the inner diameter of the elastomer.
The rotating element must go into the casing
before this sealant bonds to sleeve.
14. Lightly coat the outboard end of the shaft sleeve with
STP motor oil treatment or equal and slide the
mechanical seal head (0-400-0) onto the shaft sleeve
against the set collar. (See Fig. 47)
15. Slide outboard end of stuff box onto the shaft so that
the shaft end extends through the mechanical seal
area, but does not enter the lip seal. This will
permit installation of deflector (3-136-9).
Fig. 45
Fig. 47
Fig. 46