Goulds Pumps 3408 - IOM - Manual (Page 49)

3408 IOM 03/99
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4. 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.
5. Thoroughly clean the stuffing boxes (3-073-9) to prevent
dirt from entering the seal during startup.
6. 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. (See Fig. 35)
7. 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.
8. Lubricate and roll O-ring (3-914-1) into the groove
in each stuffing box.
NOTE: Steps 9 through 21 must be completed
within 10 to 12 minutes to assure proper placement
of mechanical seal. 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.
9. Lightly coat the outboard end of the shaft with
STP motor oil treatment or equal and slide the
mechanical seal head (0-400-0) onto the shaft
(See Fig. 36).
NOTE: Standard mechanical seal for this
arrangement is a modified John Crane, Type
21 Mechanical Seal.
10. Slide one of the stuffing boxes on 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).
11. Slide the deflector over the shaft end; then carefully
push the shaft end through the lip seal and slide
stuffing box fully onto the shaft.
NOTE: Compress the seal spring only as far as
required to install bearings.
12. Heat the ball bearing (3-026-4), using either dry heat
or a 10-15% soluble oil and water solution.
▲
! CAUTION
Do not exceed 275° F.
13. Using gloves, slide the heated bearing onto the shaft
against the shaft shoulder. (See Fig. 37)
Fig. 35
Fig. 36
Fig. 37
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