Goulds Pumps 3410 - IOM - Manual (Page 49)

REASSEMBLY
!
Check for magnetism on the pump shaft and degauss
the shaft if there is any detectable magnetism.
Magnetism will attract ferritic objects to the impeller,
seal and bearings which can result in excess heat
generation, sparks and premature failure.
• Insert key (178) in shaft (122).
• Determine correct positioning of impeller (101) on shaft
(122). Facing coupling end of shaft, determine proper
rotation of unit (clockwise or counterclockwise). Fig. 3-6
shows proper relationship between rotation and impeller
vane curvature for counterclockwise rotation.
S Group – Install retaining ring (361H) in inboard
(coupling end) retaining groove.
Slide impeller (101) on shaft. On S Group, drive
impeller flush with retaining ring (361H).
$
CAUTION
Do not damage end of shaft.
If same shaft and impeller are used, line up
impeller hub with scribe mark made on shaft
during disassembly.
• Group M, L, XL Only (for S Group go to step 5) – Place
sleeve to impeller gasket (428) on impeller (101). Ensure
gasket is aligned with key (178).
• Groups M, L, XL Only
a. Slide sleeve (126) on shaft.
b. Slide O-rings (497) on shaft by stretching over
threaded end of shaft.
c. Using spanner or strap wrench tighten sleeve nuts
(124), adjusting impeller to approximate center. Do
not tighten set screw. Additional impeller
adjustment will be required when rotating element
is placed in casing.
!
The impeller and wear ring clearance setting
procedures must be followed. Improperly setting the
clearance or not following any of the proper
procedures can result in sparks, unexpected heat
generation and equipment damage.
• S Group Only – Install impeller retaining ring (361H) as
follows:
Outboard (thrust end) retaining ring groove and
retaining ring (361H) are tapered (see Fig. 39).
Install retaining ring so that tapered side is facing
outboard end of shaft. Inward pressure asserted by
double taper provides automatic centering of
impeller, and eliminates lateral play.
• S Group with optional sleeve only – Ensure shaft is free
of dirt, grease, and bonding compounds. Apply a thin
coat of Locktite 635, or equal, to shaft sleeve area and
inside of sleeve. Slide sleeve on outboard end of shaft,
make sure sleeve is firmly seated against shaft shoulder.
• Position casing wear rings (103) on impeller, ensure
anti-rotation pins (445A) are firmly seated.
• Slide stuffing box bushing (125) on shaft or sleeve.
(Units with mechanical seals do not have a stuffing box
bushing.) If unit is equipped with mechanical seals,
install seals at this time. Refer to manufacturer’s
instructions for details.
• Slide deflectors (123), bearing end covers (109), and
gaskets (360) on shaft.
• Install bearings as follows:
a. Apply a thin film of machine oil to bearing seats on
shaft.
b. Start bearings (112 and 168) on shaft by tapping
inner race with a hammer or mallet, keeping
bearing square at all times.
c. Once bearing is started on shaft, a driving sleeve
should be used. Sleeve should contact only 1 inner
race. Press or drive bearing until it contacts
shoulder on inboard side of seal.
d. For outbound or thrust bearing. Install tapered
bearing retaining ring (361) in retaining ring
groove on outboard (thrust) end of shaft (122), as
shown in Fig. 39.
• Slide bearing housings (134) over bearings.
• To torque screws (371C) to 12 ft-lbs (16.3 N.M.) for all
3410 models, proceed as follows:
a. Using X pattern, torque screws to 8 ft-lbs
(11 N.M.).
b. Again, using X pattern, torque screws to 12 ft-lbs
(16.3 N.M.).
c. Repeat steps 1 and 2 on the other side.
• Using sling, adequate hoist or lift, install rotating element
in lower casing.
a. Ensure casing wear ring (103) and anti-rotation
pins (445A) seat properly in wear ring grooves and
pin grooves.
b. Using strap wrench, adjust impeller so that it is
centered in seated wear rings by tightening or
loosening sleeve nuts as required. Torque sleeve
nuts (124) (M, L, XL only) to 30 ft-lbs (40.7
N.M.), tighten sleeve nut set screws (222B).
3410 IOM 1/2010
47
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